diff --git a/governance/.gitignore b/governance/.gitignore
index 8821e7a8def..f1767c02748 100644
--- a/governance/.gitignore
+++ b/governance/.gitignore
@@ -10,4 +10,5 @@ artifacts-zk
 cache-zk
 
 .openzeppelin
-xcalled.tmp.json
\ No newline at end of file
+xcalled.tmp.json
+*.log
\ No newline at end of file
diff --git a/governance/helpers/subgraph.js b/governance/helpers/subgraph.js
new file mode 100644
index 00000000000..5928244c911
--- /dev/null
+++ b/governance/helpers/subgraph.js
@@ -0,0 +1,31 @@
+const { networks } = require('@unlock-protocol/networks')
+
+const fetchFromSubgraph = async ({ chainId, query }) => {
+  const { subgraph } = networks[chainId]
+
+  if (!subgraph || !subgraph.endpoint) {
+    console.log(
+      'Missing subGraphURI for this network. Can not fetch from The Graph'
+    )
+    return []
+  }
+
+  const q = await fetch(subgraph.endpoint, {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify({
+      query,
+    }),
+  })
+
+  const { data, errors } = await q.json()
+  if (errors) {
+    console.log('SUBGRAPH > [Error] while fetching the graph', errors)
+    return []
+  }
+  return data
+}
+
+module.exports = {
+  fetchFromSubgraph,
+}
diff --git a/governance/scripts/lock/listManagers.js b/governance/scripts/lock/listManagers.js
index ab1823c3123..81cb376ea79 100644
--- a/governance/scripts/lock/listManagers.js
+++ b/governance/scripts/lock/listManagers.js
@@ -1,19 +1,11 @@
 const { ethers } = require('hardhat')
-const { networks } = require('@unlock-protocol/networks')
+const { fetchFromSubgraph } = require('../../helpers/subgraph')
 
 async function main({ lockAddress }) {
   const PublicLock = await ethers.getContractFactory('PublicLock')
   const lock = PublicLock.attach(lockAddress)
 
   const { chainId } = await ethers.provider.getNetwork()
-  const { subgraph } = networks[chainId]
-
-  if (!subgraph || !subgraph.endpoint) {
-    console.log(
-      'Missing subGraphURI for this network. Can not fetch from The Graph'
-    )
-    return []
-  }
 
   const query = `
     {
@@ -27,25 +19,11 @@ async function main({ lockAddress }) {
     }
   `
 
-  const q = await fetch(subgraph.endpoint, {
-    method: 'POST',
-    headers: { 'Content-Type': 'application/json' },
-    body: JSON.stringify({
-      query,
-    }),
-  })
-
-  const { data, errors } = await q.json()
-  if (errors) {
-    console.log('LOCK > Error while fetching the graph', errors)
-    return []
-  }
-
   const {
     locks: [{ LockManagers }],
-  } = data
-  const managers = LockManagers.map((m) => m.address)
+  } = await fetchFromSubgraph({ chainId, query })
 
+  const managers = LockManagers.map((m) => m.address)
   console.log(
     `LOCK > managers for the lock '${await lock.name()}' (${lockAddress}):`
   )
diff --git a/governance/scripts/lock/outdated.js b/governance/scripts/lock/outdated.js
new file mode 100644
index 00000000000..676d5f07de2
--- /dev/null
+++ b/governance/scripts/lock/outdated.js
@@ -0,0 +1,146 @@
+const { fetchFromSubgraph } = require('../../helpers/subgraph')
+const { networks } = require('@unlock-protocol/networks')
+
+async function getAllReceipts({ timeLimit, chainId }) {
+  const limit = 1000
+  let skip = 0
+  let more = true
+  const receipts = []
+  while (more) {
+    // console.log(`fetching results from  ${skip} to ${limit}`)
+    const receiptsQuery = `
+    {
+      receipts(
+        skip: ${skip}
+        first: ${limit}
+        where:{
+          timestamp_gte: ${timeLimit} 
+        }
+        ) {
+        lockAddress
+      }
+    }
+`
+    const { receipts: results } = await fetchFromSubgraph({
+      chainId,
+      query: receiptsQuery,
+    })
+
+    if (results.length < limit) {
+      more = false
+    } else {
+      skip += limit
+    }
+    receipts.push(...results)
+  }
+  return receipts
+}
+
+async function getLockVersions({ chainId, lockAddresses }) {
+  const versionsQuery = `
+      {
+        locks(
+          orderBy: version
+          sortDirection: DESC
+          where:{
+            address_in: ${JSON.stringify(lockAddresses)}
+            
+          }
+        ) {
+          version
+          address
+        }
+      }
+    `
+
+  const { locks } = await fetchFromSubgraph({
+    chainId,
+    query: versionsQuery,
+  })
+
+  // append chainId
+  return locks.map((lock) => ({ ...lock, chainId }))
+}
+
+async function getAllLockVersionInfo({ chainId, timeLimit }) {
+  // get all receipts before the date
+  const receipts = await getAllReceipts({ chainId, timeLimit })
+
+  // parse all addresses
+  const lockAddresses = receipts
+    .map(({ lockAddress }) => lockAddress)
+    .reduce((prev, curr) => (!prev.includes(curr) ? [...prev, curr] : prev), [])
+
+  // get all receipts before the date
+  const versions = await getLockVersions({ chainId, lockAddresses })
+  const count = versions.reduce(
+    (prev, { version }) => ((prev[version] = (prev[version] || 0) + 1), prev),
+    {}
+  )
+  const earliest = Object.keys(count)[0]
+  const earliestLocks = versions.filter(({ version }) => version == earliest)
+  return {
+    chainId,
+    receipts,
+    lockAddresses,
+    earliest,
+    earliestLocks,
+    count,
+  }
+}
+
+function logLocks({
+  chainId,
+  receipts,
+  lockAddresses,
+  earliest,
+  earliestLocks,
+  count,
+}) {
+  const { name } = networks[chainId]
+  console.log(
+    `${name} (${chainId}): 
+    - receipts: ${receipts.length}
+    - locks: ${lockAddresses.length} unique lock addresses
+    - earliest version ${earliest} 
+    - earliest ${earliestLocks.length} locks (${parseInt(earliest) < 9 ? earliestLocks.map(({ address }) => address).join(',') : ''})
+    - versions: ${Object.keys(count)
+      .map((v) => `v${v}:${count[v]}`)
+      .join(',')}
+    `
+  )
+}
+
+async function main({ deadline = '2022-01-01' } = {}) {
+  console.log(`Before ${deadline}`)
+  const timeLimit = new Date(deadline).getTime() / 1000
+
+  const chains = Object.keys(networks).filter(
+    (id) => !isNaN(parseInt(id)) && !networks[id].isTestNetwork
+  )
+  console.log(`Chains: ${chains.join(',')} `)
+  const infos = {}
+  await Promise.all(
+    chains.map(async (chainId) => {
+      try {
+        const info = await getAllLockVersionInfo({ chainId, timeLimit })
+        infos[chainId] = info
+        logLocks(info)
+      } catch (error) {
+        console.log(`Couldn't fetch chain ${chainId}: ${error.message}`)
+      }
+    })
+  )
+}
+
+// execute as standalone
+if (require.main === module) {
+  main()
+    .then(() => process.exit(0))
+    .catch((error) => {
+      console.error(error)
+      process.exit(1)
+    })
+}
+
+module.exports = main
diff --git a/packages/contracts/hardhat.config.js b/packages/contracts/hardhat.config.js
index 8c5fd77d61e..899589058fc 100644
--- a/packages/contracts/hardhat.config.js
+++ b/packages/contracts/hardhat.config.js
@@ -33,15 +33,6 @@ const settings = {
 module.exports = {
   solidity: {
     compilers: [
-      { version: '0.4.24', settings },
-      { version: '0.4.25', settings },
-      { version: '0.5.0', settings },
-      { version: '0.5.12', settings },
-      { version: '0.5.17', settings },
-      { version: '0.5.14', settings },
-      { version: '0.5.7', settings },
-      { version: '0.5.9', settings },
-      { version: '0.6.12', settings },
       { version: '0.7.6', settings },
       { version: '0.8.0', settings },
       { version: '0.8.2', settings },
diff --git a/packages/contracts/src/abis/PublicLock/PublicLockV0.json b/packages/contracts/src/abis/PublicLock/PublicLockV0.json
deleted file mode 100644
index d28180ae018..00000000000
--- a/packages/contracts/src/abis/PublicLock/PublicLockV0.json
+++ /dev/null
@@ -1,674 +0,0 @@
-{
-  "contractName": "PublicLock",
-  "abi": [
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "interfaceId",
-          "type": "bytes4"
-        }
-      ],
-      "name": "supportsInterface",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "name": "owners",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "unlockProtocol",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "keyPrice",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "expirationDuration",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "numberOfKeysSold",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "renounceOwnership",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "maxNumberOfKeys",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "initialize",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "owner",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "isOwner",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "sender",
-          "type": "address"
-        }
-      ],
-      "name": "initialize",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "newOwner",
-          "type": "address"
-        }
-      ],
-      "name": "transferOwnership",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        },
-        {
-          "name": "_expirationDuration",
-          "type": "uint256"
-        },
-        {
-          "name": "_keyPrice",
-          "type": "uint256"
-        },
-        {
-          "name": "_maxNumberOfKeys",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "constructor"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "name": "oldKeyPrice",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "name": "keyPrice",
-          "type": "uint256"
-        }
-      ],
-      "name": "PriceChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "name": "_sender",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "name": "_amount",
-          "type": "uint256"
-        }
-      ],
-      "name": "Withdrawal",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "name": "previousOwner",
-          "type": "address"
-        }
-      ],
-      "name": "OwnershipRenounced",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "name": "previousOwner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "name": "newOwner",
-          "type": "address"
-        }
-      ],
-      "name": "OwnershipTransferred",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "name": "_from",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "Transfer",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "name": "_owner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "name": "_approved",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "Approval",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "name": "_owner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "name": "_operator",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "name": "_approved",
-          "type": "bool"
-        }
-      ],
-      "name": "ApprovalForAll",
-      "type": "event"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_recipient",
-          "type": "address"
-        },
-        {
-          "name": "_data",
-          "type": "bytes"
-        }
-      ],
-      "name": "purchaseFor",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_recipient",
-          "type": "address"
-        },
-        {
-          "name": "_referrer",
-          "type": "address"
-        },
-        {
-          "name": "_data",
-          "type": "bytes"
-        }
-      ],
-      "name": "purchaseForFrom",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_from",
-          "type": "address"
-        },
-        {
-          "name": "_recipient",
-          "type": "address"
-        },
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "transferFrom",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "withdraw",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_amount",
-          "type": "uint256"
-        }
-      ],
-      "name": "partialWithdraw",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_approved",
-          "type": "address"
-        },
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "approve",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_keyPrice",
-          "type": "uint256"
-        }
-      ],
-      "name": "updateKeyPrice",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "balanceOf",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "ownerOf",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_account",
-          "type": "address"
-        }
-      ],
-      "name": "getTokenIdFor",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "getApproved",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "numberOfOwners",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "outstandingKeys",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_page",
-          "type": "uint256"
-        },
-        {
-          "name": "_pageSize",
-          "type": "uint256"
-        }
-      ],
-      "name": "getOwnersByPage",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address[]"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "expireKeyFor",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "keyDataFor",
-      "outputs": [
-        {
-          "name": "data",
-          "type": "bytes"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "keyExpirationTimestampFor",
-      "outputs": [
-        {
-          "name": "timestamp",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "operator",
-          "type": "address"
-        },
-        {
-          "name": "from",
-          "type": "address"
-        },
-        {
-          "name": "tokenId",
-          "type": "uint256"
-        },
-        {
-          "name": "data",
-          "type": "bytes"
-        }
-      ],
-      "name": "onERC721Received",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bytes4"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    }
-  ],
-  "bytecode": 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-  "compiler": {
-    "name": "solc",
-    "version": "0.4.25+commit.59dbf8f1.Emscripten.clang"
-  },
-  "schemaVersion": "2.0.2",
-  "updatedAt": "2019-03-02T13:33:23.745Z"
-}
diff --git a/packages/contracts/src/abis/PublicLock/PublicLockV1.json b/packages/contracts/src/abis/PublicLock/PublicLockV1.json
deleted file mode 100644
index f415fd05dde..00000000000
--- a/packages/contracts/src/abis/PublicLock/PublicLockV1.json
+++ /dev/null
@@ -1,1139 +0,0 @@
-{
-  "contractName": "PublicLock",
-  "abi": [
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "interfaceId",
-          "type": "bytes4"
-        }
-      ],
-      "name": "supportsInterface",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "name": "owners",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "name",
-      "outputs": [
-        {
-          "name": "",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "getApproved",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_approved",
-          "type": "address"
-        },
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "approve",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "refundPenaltyDenominator",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "refundPenaltyNumerator",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "unlockProtocol",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_page",
-          "type": "uint256"
-        },
-        {
-          "name": "_pageSize",
-          "type": "uint256"
-        }
-      ],
-      "name": "getOwnersByPage",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address[]"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "keyPrice",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "expirationDuration",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "",
-          "type": "address"
-        },
-        {
-          "name": "",
-          "type": "address"
-        },
-        {
-          "name": "",
-          "type": "uint256"
-        },
-        {
-          "name": "",
-          "type": "bytes"
-        }
-      ],
-      "name": "onERC721Received",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bytes4"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "totalSupply",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_keyPrice",
-          "type": "uint256"
-        }
-      ],
-      "name": "updateKeyPrice",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "cancelAndRefund",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_from",
-          "type": "address"
-        },
-        {
-          "name": "_recipient",
-          "type": "address"
-        },
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "transferFrom",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_refundPenaltyNumerator",
-          "type": "uint256"
-        },
-        {
-          "name": "_refundPenaltyDenominator",
-          "type": "uint256"
-        }
-      ],
-      "name": "updateRefundPenalty",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "numberOfKeysSold",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "withdraw",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_transferFeeNumerator",
-          "type": "uint256"
-        },
-        {
-          "name": "_transferFeeDenominator",
-          "type": "uint256"
-        }
-      ],
-      "name": "updateTransferFee",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "isAlive",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_from",
-          "type": "address"
-        },
-        {
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "safeTransferFrom",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "getCancelAndRefundValueFor",
-      "outputs": [
-        {
-          "name": "refund",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_lockName",
-          "type": "string"
-        }
-      ],
-      "name": "updateLockName",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "ownerOf",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "getHasValidKey",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "balanceOf",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_recipient",
-          "type": "address"
-        },
-        {
-          "name": "_referrer",
-          "type": "address"
-        }
-      ],
-      "name": "purchaseForFrom",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "renounceOwnership",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_amount",
-          "type": "uint256"
-        }
-      ],
-      "name": "partialWithdraw",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "maxNumberOfKeys",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_recipients",
-          "type": "address[]"
-        },
-        {
-          "name": "_expirationTimestamps",
-          "type": "uint256[]"
-        }
-      ],
-      "name": "grantKeys",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "owner",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "isOwner",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "transferFeeNumerator",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "numberOfOwners",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_account",
-          "type": "address"
-        }
-      ],
-      "name": "getTokenIdFor",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        },
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "isKeyOwner",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_recipient",
-          "type": "address"
-        },
-        {
-          "name": "_expirationTimestamp",
-          "type": "uint256"
-        }
-      ],
-      "name": "grantKey",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "tokenAddress",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "expireKeyFor",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "name": "_approved",
-          "type": "bool"
-        }
-      ],
-      "name": "setApprovalForAll",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "destroyLock",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "keyExpirationTimestampFor",
-      "outputs": [
-        {
-          "name": "timestamp",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_from",
-          "type": "address"
-        },
-        {
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        },
-        {
-          "name": "_data",
-          "type": "bytes"
-        }
-      ],
-      "name": "safeTransferFrom",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "disableLock",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "sender",
-          "type": "address"
-        }
-      ],
-      "name": "initialize",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "publicLockVersion",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "transferFeeDenominator",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        },
-        {
-          "name": "_operator",
-          "type": "address"
-        }
-      ],
-      "name": "isApprovedForAll",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "newOwner",
-          "type": "address"
-        }
-      ],
-      "name": "transferOwnership",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_recipient",
-          "type": "address"
-        }
-      ],
-      "name": "purchaseFor",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_recipients",
-          "type": "address[]"
-        },
-        {
-          "name": "_expirationTimestamp",
-          "type": "uint256"
-        }
-      ],
-      "name": "grantKeys",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        },
-        {
-          "name": "_expirationDuration",
-          "type": "uint256"
-        },
-        {
-          "name": "_tokenAddress",
-          "type": "address"
-        },
-        {
-          "name": "_keyPrice",
-          "type": "uint256"
-        },
-        {
-          "name": "_maxNumberOfKeys",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "constructor"
-    },
-    {
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "fallback"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "name": "oldTransferFeeNumerator",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "name": "oldTransferFeeDenominator",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "name": "transferFeeNumerator",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "name": "transferFeeDenominator",
-          "type": "uint256"
-        }
-      ],
-      "name": "TransferFeeChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "name": "tokenId",
-          "type": "uint256"
-        },
-        {
-          "indexed": true,
-          "name": "owner",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "name": "refund",
-          "type": "uint256"
-        }
-      ],
-      "name": "CancelKey",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "name": "oldRefundPenaltyNumerator",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "name": "oldRefundPenaltyDenominator",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "name": "refundPenaltyNumerator",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "name": "refundPenaltyDenominator",
-          "type": "uint256"
-        }
-      ],
-      "name": "RefundPenaltyChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "name": "tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "ExpireKey",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "name": "oldKeyPrice",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "name": "keyPrice",
-          "type": "uint256"
-        }
-      ],
-      "name": "PriceChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "name": "_sender",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "name": "_amount",
-          "type": "uint256"
-        }
-      ],
-      "name": "Withdrawal",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "name": "balance",
-          "type": "uint256"
-        },
-        {
-          "indexed": true,
-          "name": "owner",
-          "type": "address"
-        }
-      ],
-      "name": "Destroy",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [],
-      "name": "Disable",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "name": "previousOwner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "name": "newOwner",
-          "type": "address"
-        }
-      ],
-      "name": "OwnershipTransferred",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "name": "_from",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "name": "_to",
-          "type": "address"
-        },
-        {
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-  "compiler": {
-    "name": "solc",
-    "version": "0.5.7+commit.6da8b019.Emscripten.clang"
-  },
-  "schemaVersion": "3.0.6",
-  "updatedAt": "2019-04-04T15:05:08.513Z"
-}
diff --git a/packages/contracts/src/abis/PublicLock/PublicLockV2.json b/packages/contracts/src/abis/PublicLock/PublicLockV2.json
deleted file mode 100644
index d990679ab70..00000000000
--- a/packages/contracts/src/abis/PublicLock/PublicLockV2.json
+++ /dev/null
@@ -1,1158 +0,0 @@
-{
-  "contractName": "PublicLock",
-  "abi": [
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "interfaceId",
-          "type": "bytes4"
-        }
-      ],
-      "name": "supportsInterface",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "name": "owners",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "name",
-      "outputs": [
-        {
-          "name": "",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "getApproved",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_approved",
-          "type": "address"
-        },
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "approve",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "refundPenaltyDenominator",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "refundPenaltyNumerator",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "unlockProtocol",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_page",
-          "type": "uint256"
-        },
-        {
-          "name": "_pageSize",
-          "type": "uint256"
-        }
-      ],
-      "name": "getOwnersByPage",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address[]"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "keyPrice",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "expirationDuration",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "",
-          "type": "address"
-        },
-        {
-          "name": "",
-          "type": "address"
-        },
-        {
-          "name": "",
-          "type": "uint256"
-        },
-        {
-          "name": "",
-          "type": "bytes"
-        }
-      ],
-      "name": "onERC721Received",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bytes4"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "totalSupply",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_keyPrice",
-          "type": "uint256"
-        }
-      ],
-      "name": "updateKeyPrice",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "cancelAndRefund",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_from",
-          "type": "address"
-        },
-        {
-          "name": "_recipient",
-          "type": "address"
-        },
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "transferFrom",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_refundPenaltyNumerator",
-          "type": "uint256"
-        },
-        {
-          "name": "_refundPenaltyDenominator",
-          "type": "uint256"
-        }
-      ],
-      "name": "updateRefundPenalty",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "numberOfKeysSold",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "withdraw",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_transferFeeNumerator",
-          "type": "uint256"
-        },
-        {
-          "name": "_transferFeeDenominator",
-          "type": "uint256"
-        }
-      ],
-      "name": "updateTransferFee",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "isAlive",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_from",
-          "type": "address"
-        },
-        {
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "safeTransferFrom",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "getCancelAndRefundValueFor",
-      "outputs": [
-        {
-          "name": "refund",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_lockName",
-          "type": "string"
-        }
-      ],
-      "name": "updateLockName",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "ownerOf",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "getHasValidKey",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "balanceOf",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_recipient",
-          "type": "address"
-        },
-        {
-          "name": "_referrer",
-          "type": "address"
-        }
-      ],
-      "name": "purchaseForFrom",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "renounceOwnership",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_amount",
-          "type": "uint256"
-        }
-      ],
-      "name": "partialWithdraw",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "maxNumberOfKeys",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_recipients",
-          "type": "address[]"
-        },
-        {
-          "name": "_expirationTimestamps",
-          "type": "uint256[]"
-        }
-      ],
-      "name": "grantKeys",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "getTransferFee",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "owner",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "isOwner",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "transferFeeNumerator",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "numberOfOwners",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_account",
-          "type": "address"
-        }
-      ],
-      "name": "getTokenIdFor",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        },
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "isKeyOwner",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_recipient",
-          "type": "address"
-        },
-        {
-          "name": "_expirationTimestamp",
-          "type": "uint256"
-        }
-      ],
-      "name": "grantKey",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "tokenAddress",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "expireKeyFor",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "name": "_approved",
-          "type": "bool"
-        }
-      ],
-      "name": "setApprovalForAll",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "destroyLock",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "keyExpirationTimestampFor",
-      "outputs": [
-        {
-          "name": "timestamp",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_from",
-          "type": "address"
-        },
-        {
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        },
-        {
-          "name": "_data",
-          "type": "bytes"
-        }
-      ],
-      "name": "safeTransferFrom",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "disableLock",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "sender",
-          "type": "address"
-        }
-      ],
-      "name": "initialize",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "publicLockVersion",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint8"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "transferFeeDenominator",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        },
-        {
-          "name": "_operator",
-          "type": "address"
-        }
-      ],
-      "name": "isApprovedForAll",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "newOwner",
-          "type": "address"
-        }
-      ],
-      "name": "transferOwnership",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_recipient",
-          "type": "address"
-        }
-      ],
-      "name": "purchaseFor",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_recipients",
-          "type": "address[]"
-        },
-        {
-          "name": "_expirationTimestamp",
-          "type": "uint256"
-        }
-      ],
-      "name": "grantKeys",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        },
-        {
-          "name": "_expirationDuration",
-          "type": "uint256"
-        },
-        {
-          "name": "_tokenAddress",
-          "type": "address"
-        },
-        {
-          "name": "_keyPrice",
-          "type": "uint256"
-        },
-        {
-          "name": "_maxNumberOfKeys",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "constructor"
-    },
-    {
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "fallback"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "name": "tokenId",
-          "type": "uint256"
-        },
-        {
-          "indexed": true,
-          "name": "owner",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "name": "refund",
-          "type": "uint256"
-        }
-      ],
-      "name": "CancelKey",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "name": "oldRefundPenaltyNumerator",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "name": "oldRefundPenaltyDenominator",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "name": "refundPenaltyNumerator",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "name": "refundPenaltyDenominator",
-          "type": "uint256"
-        }
-      ],
-      "name": "RefundPenaltyChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "name": "oldTransferFeeNumerator",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "name": "oldTransferFeeDenominator",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "name": "transferFeeNumerator",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "name": "transferFeeDenominator",
-          "type": "uint256"
-        }
-      ],
-      "name": "TransferFeeChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "name": "tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "ExpireKey",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "name": "oldKeyPrice",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "name": "keyPrice",
-          "type": "uint256"
-        }
-      ],
-      "name": "PriceChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "name": "_sender",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "name": "_amount",
-          "type": "uint256"
-        }
-      ],
-      "name": "Withdrawal",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "name": "balance",
-          "type": "uint256"
-        },
-        {
-          "indexed": true,
-          "name": "owner",
-          "type": "address"
-        }
-      ],
-      "name": "Destroy",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [],
-      "name": "Disable",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "name": "previousOwner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "name": "newOwner",
-          "type": "address"
-        }
-      ],
-      "name": "OwnershipTransferred",
-      "type": "event"
-    },
-    {
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-  "compiler": {
-    "name": "solc",
-    "version": "0.5.7+commit.6da8b019.Emscripten.clang"
-  },
-  "schemaVersion": "3.0.6",
-  "updatedAt": "2019-04-18T21:59:58.635Z"
-}
diff --git a/packages/contracts/src/abis/PublicLock/PublicLockV3.json b/packages/contracts/src/abis/PublicLock/PublicLockV3.json
deleted file mode 100644
index a61c7ce123e..00000000000
--- a/packages/contracts/src/abis/PublicLock/PublicLockV3.json
+++ /dev/null
@@ -1,1378 +0,0 @@
-{
-  "contractName": "PublicLock",
-  "abi": [
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "interfaceId",
-          "type": "bytes4"
-        }
-      ],
-      "name": "supportsInterface",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "name": "owners",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "name",
-      "outputs": [
-        {
-          "name": "",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "getApproved",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_approved",
-          "type": "address"
-        },
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "approve",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "refundPenaltyDenominator",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "refundPenaltyNumerator",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "unlockProtocol",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_page",
-          "type": "uint256"
-        },
-        {
-          "name": "_pageSize",
-          "type": "uint256"
-        }
-      ],
-      "name": "getOwnersByPage",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address[]"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "keyPrice",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "expirationDuration",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "",
-          "type": "address"
-        },
-        {
-          "name": "",
-          "type": "address"
-        },
-        {
-          "name": "",
-          "type": "uint256"
-        },
-        {
-          "name": "",
-          "type": "bytes"
-        }
-      ],
-      "name": "onERC721Received",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bytes4"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "totalSupply",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_keyPrice",
-          "type": "uint256"
-        }
-      ],
-      "name": "updateKeyPrice",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "cancelAndRefund",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_from",
-          "type": "address"
-        },
-        {
-          "name": "_recipient",
-          "type": "address"
-        },
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "transferFrom",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_baseTokenURI",
-          "type": "string"
-        }
-      ],
-      "name": "setBaseTokenURI",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_refundPenaltyNumerator",
-          "type": "uint256"
-        },
-        {
-          "name": "_refundPenaltyDenominator",
-          "type": "uint256"
-        }
-      ],
-      "name": "updateRefundPenalty",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "numberOfKeysSold",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "withdraw",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_transferFeeNumerator",
-          "type": "uint256"
-        },
-        {
-          "name": "_transferFeeDenominator",
-          "type": "uint256"
-        }
-      ],
-      "name": "updateTransferFee",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "isAlive",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_from",
-          "type": "address"
-        },
-        {
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "safeTransferFrom",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_a",
-          "type": "string"
-        },
-        {
-          "name": "_b",
-          "type": "string"
-        },
-        {
-          "name": "_c",
-          "type": "string"
-        },
-        {
-          "name": "_d",
-          "type": "string"
-        }
-      ],
-      "name": "strConcat",
-      "outputs": [
-        {
-          "name": "_concatenatedString",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "pure",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "name": "keyOwnerToNonce",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_i",
-          "type": "uint256"
-        }
-      ],
-      "name": "uint2Str",
-      "outputs": [
-        {
-          "name": "_uintAsString",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "pure",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "getCancelAndRefundValueFor",
-      "outputs": [
-        {
-          "name": "refund",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_lockName",
-          "type": "string"
-        }
-      ],
-      "name": "updateLockName",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_addr",
-          "type": "address"
-        }
-      ],
-      "name": "address2Str",
-      "outputs": [
-        {
-          "name": "",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "pure",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "incrementNonce",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "ownerOf",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "getHasValidKey",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "balanceOf",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_recipient",
-          "type": "address"
-        },
-        {
-          "name": "_referrer",
-          "type": "address"
-        }
-      ],
-      "name": "purchaseForFrom",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "renounceOwnership",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_amount",
-          "type": "uint256"
-        }
-      ],
-      "name": "partialWithdraw",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "maxNumberOfKeys",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_lockSymbol",
-          "type": "string"
-        }
-      ],
-      "name": "updateLockSymbol",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_recipients",
-          "type": "address[]"
-        },
-        {
-          "name": "_expirationTimestamps",
-          "type": "uint256[]"
-        }
-      ],
-      "name": "grantKeys",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "getTransferFee",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_keyOwner",
-          "type": "address"
-        },
-        {
-          "name": "_txSender",
-          "type": "address"
-        }
-      ],
-      "name": "getCancelAndRefundApprovalHash",
-      "outputs": [
-        {
-          "name": "approvalHash",
-          "type": "bytes32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "owner",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "isOwner",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "transferFeeNumerator",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "numberOfOwners",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "symbol",
-      "outputs": [
-        {
-          "name": "",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_account",
-          "type": "address"
-        }
-      ],
-      "name": "getTokenIdFor",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        },
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "isKeyOwner",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_recipient",
-          "type": "address"
-        },
-        {
-          "name": "_expirationTimestamp",
-          "type": "uint256"
-        }
-      ],
-      "name": "grantKey",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "tokenAddress",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "expireKeyFor",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "name": "_approved",
-          "type": "bool"
-        }
-      ],
-      "name": "setApprovalForAll",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "destroyLock",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "keyExpirationTimestampFor",
-      "outputs": [
-        {
-          "name": "timestamp",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_from",
-          "type": "address"
-        },
-        {
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        },
-        {
-          "name": "_data",
-          "type": "bytes"
-        }
-      ],
-      "name": "safeTransferFrom",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_keyOwner",
-          "type": "address"
-        },
-        {
-          "name": "_signature",
-          "type": "bytes"
-        }
-      ],
-      "name": "cancelAndRefundFor",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "disableLock",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "sender",
-          "type": "address"
-        }
-      ],
-      "name": "initialize",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "tokenURI",
-      "outputs": [
-        {
-          "name": "",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "transferFeeDenominator",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        },
-        {
-          "name": "_operator",
-          "type": "address"
-        }
-      ],
-      "name": "isApprovedForAll",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "newOwner",
-          "type": "address"
-        }
-      ],
-      "name": "transferOwnership",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
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-  "compiler": {
-    "name": "solc",
-    "version": "0.5.7+commit.6da8b019.Emscripten.clang"
-  },
-  "schemaVersion": "3.0.9",
-  "updatedAt": "2019-05-21T02:16:43.430Z"
-}
diff --git a/packages/contracts/src/abis/PublicLock/PublicLockV4.json b/packages/contracts/src/abis/PublicLock/PublicLockV4.json
deleted file mode 100644
index 3b3a8ababfe..00000000000
--- a/packages/contracts/src/abis/PublicLock/PublicLockV4.json
+++ /dev/null
@@ -1,1421 +0,0 @@
-{
-  "contractName": "PublicLock",
-  "abi": [
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "interfaceId",
-          "type": "bytes4"
-        }
-      ],
-      "name": "supportsInterface",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "name": "owners",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "name",
-      "outputs": [
-        {
-          "name": "",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "getApproved",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_approved",
-          "type": "address"
-        },
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "approve",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_beneficiary",
-          "type": "address"
-        }
-      ],
-      "name": "updateBeneficiary",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "refundPenaltyDenominator",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "refundPenaltyNumerator",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "unlockProtocol",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_page",
-          "type": "uint256"
-        },
-        {
-          "name": "_pageSize",
-          "type": "uint256"
-        }
-      ],
-      "name": "getOwnersByPage",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address[]"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "keyPrice",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "expirationDuration",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "",
-          "type": "address"
-        },
-        {
-          "name": "",
-          "type": "address"
-        },
-        {
-          "name": "",
-          "type": "uint256"
-        },
-        {
-          "name": "",
-          "type": "bytes"
-        }
-      ],
-      "name": "onERC721Received",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bytes4"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "totalSupply",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_keyPrice",
-          "type": "uint256"
-        }
-      ],
-      "name": "updateKeyPrice",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "cancelAndRefund",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_from",
-          "type": "address"
-        },
-        {
-          "name": "_recipient",
-          "type": "address"
-        },
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "transferFrom",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_amount",
-          "type": "uint256"
-        }
-      ],
-      "name": "withdraw",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_baseTokenURI",
-          "type": "string"
-        }
-      ],
-      "name": "setBaseTokenURI",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "beneficiary",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_refundPenaltyNumerator",
-          "type": "uint256"
-        },
-        {
-          "name": "_refundPenaltyDenominator",
-          "type": "uint256"
-        }
-      ],
-      "name": "updateRefundPenalty",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "numberOfKeysSold",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_transferFeeNumerator",
-          "type": "uint256"
-        },
-        {
-          "name": "_transferFeeDenominator",
-          "type": "uint256"
-        }
-      ],
-      "name": "updateTransferFee",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "isAlive",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_from",
-          "type": "address"
-        },
-        {
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "safeTransferFrom",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_a",
-          "type": "string"
-        },
-        {
-          "name": "_b",
-          "type": "string"
-        },
-        {
-          "name": "_c",
-          "type": "string"
-        },
-        {
-          "name": "_d",
-          "type": "string"
-        }
-      ],
-      "name": "strConcat",
-      "outputs": [
-        {
-          "name": "_concatenatedString",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "pure",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "name": "keyOwnerToNonce",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_i",
-          "type": "uint256"
-        }
-      ],
-      "name": "uint2Str",
-      "outputs": [
-        {
-          "name": "_uintAsString",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "pure",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "getCancelAndRefundValueFor",
-      "outputs": [
-        {
-          "name": "refund",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_lockName",
-          "type": "string"
-        }
-      ],
-      "name": "updateLockName",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_addr",
-          "type": "address"
-        }
-      ],
-      "name": "address2Str",
-      "outputs": [
-        {
-          "name": "",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "pure",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "incrementNonce",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "ownerOf",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "getHasValidKey",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "balanceOf",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_recipient",
-          "type": "address"
-        },
-        {
-          "name": "_referrer",
-          "type": "address"
-        }
-      ],
-      "name": "purchaseForFrom",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "renounceOwnership",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "maxNumberOfKeys",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_lockSymbol",
-          "type": "string"
-        }
-      ],
-      "name": "updateLockSymbol",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_recipients",
-          "type": "address[]"
-        },
-        {
-          "name": "_expirationTimestamps",
-          "type": "uint256[]"
-        }
-      ],
-      "name": "grantKeys",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "getTransferFee",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_keyOwner",
-          "type": "address"
-        },
-        {
-          "name": "_txSender",
-          "type": "address"
-        }
-      ],
-      "name": "getCancelAndRefundApprovalHash",
-      "outputs": [
-        {
-          "name": "approvalHash",
-          "type": "bytes32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "owner",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "isOwner",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "transferFeeNumerator",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "numberOfOwners",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "symbol",
-      "outputs": [
-        {
-          "name": "",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_account",
-          "type": "address"
-        }
-      ],
-      "name": "getTokenIdFor",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        },
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "isKeyOwner",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_recipient",
-          "type": "address"
-        },
-        {
-          "name": "_expirationTimestamp",
-          "type": "uint256"
-        }
-      ],
-      "name": "grantKey",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "tokenAddress",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "expireKeyFor",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "name": "_approved",
-          "type": "bool"
-        }
-      ],
-      "name": "setApprovalForAll",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "destroyLock",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "keyExpirationTimestampFor",
-      "outputs": [
-        {
-          "name": "timestamp",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_from",
-          "type": "address"
-        },
-        {
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        },
-        {
-          "name": "_data",
-          "type": "bytes"
-        }
-      ],
-      "name": "safeTransferFrom",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_keyOwner",
-          "type": "address"
-        },
-        {
-          "name": "_signature",
-          "type": "bytes"
-        }
-      ],
-      "name": "cancelAndRefundFor",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "disableLock",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "sender",
-          "type": "address"
-        }
-      ],
-      "name": "initialize",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "tokenURI",
-      "outputs": [
-        {
-          "name": "",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "transferFeeDenominator",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        },
-        {
-          "name": "_operator",
-          "type": "address"
-        }
-      ],
-      "name": "isApprovedForAll",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "newOwner",
-          "type": "address"
-        }
-      ],
-      "name": "transferOwnership",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_recipient",
-          "type": "address"
-        }
-      ],
-      "name": "purchaseFor",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_account",
-          "type": "address"
-        }
-      ],
-      "name": "getBalance",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_recipients",
-          "type": "address[]"
-        },
-        {
-          "name": "_expirationTimestamp",
-          "type": "uint256"
-        }
-      ],
-      "name": "grantKeys",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        },
-        {
-          "name": "_expirationDuration",
-          "type": "uint256"
-        },
-        {
-          "name": "_tokenAddress",
-          "type": "address"
-        },
-        {
-          "name": "_keyPrice",
-          "type": "uint256"
-        },
-        {
-          "name": "_maxNumberOfKeys",
-          "type": "uint256"
-        },
-        {
-          "name": "_lockName",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "constructor"
-    },
-    {
-      "payable": false,
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-  "compiler": {
-    "name": "solc",
-    "version": "0.5.9+commit.e560f70d.Emscripten.clang"
-  },
-  "schemaVersion": "3.0.10",
-  "updatedAt": "2019-06-05T17:55:27.559Z"
-}
diff --git a/packages/contracts/src/abis/PublicLock/PublicLockV5.json b/packages/contracts/src/abis/PublicLock/PublicLockV5.json
deleted file mode 100644
index 481bdc863a3..00000000000
--- a/packages/contracts/src/abis/PublicLock/PublicLockV5.json
+++ /dev/null
@@ -1,1574 +0,0 @@
-{
-  "contractName": "PublicLock",
-  "abi": [
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "_owner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "_approved",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "Approval",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "_owner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "_operator",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "bool",
-          "name": "_approved",
-          "type": "bool"
-        }
-      ],
-      "name": "ApprovalForAll",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "uint256",
-          "name": "tokenId",
-          "type": "uint256"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "owner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "sendTo",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "refund",
-          "type": "uint256"
-        }
-      ],
-      "name": "CancelKey",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "balance",
-          "type": "uint256"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "owner",
-          "type": "address"
-        }
-      ],
-      "name": "Destroy",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [],
-      "name": "Disable",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "uint256",
-          "name": "tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "ExpireKey",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "string",
-          "name": "symbol",
-          "type": "string"
-        }
-      ],
-      "name": "NewLockSymbol",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "keyOwner",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "nextAvailableNonce",
-          "type": "uint256"
-        }
-      ],
-      "name": "NonceChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "previousOwner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "newOwner",
-          "type": "address"
-        }
-      ],
-      "name": "OwnershipTransferred",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "oldKeyPrice",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "keyPrice",
-          "type": "uint256"
-        }
-      ],
-      "name": "PriceChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "freeTrialLength",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "refundPenaltyBasisPoints",
-          "type": "uint256"
-        }
-      ],
-      "name": "RefundPenaltyChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "_amount",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "internalType": "bool",
-          "name": "_timeAdded",
-          "type": "bool"
-        }
-      ],
-      "name": "TimestampChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "_from",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "Transfer",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "transferFeeBasisPoints",
-          "type": "uint256"
-        }
-      ],
-      "name": "TransferFeeChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "sender",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "tokenAddress",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "beneficiary",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "amount",
-          "type": "uint256"
-        }
-      ],
-      "name": "Withdrawal",
-      "type": "event"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "BASIS_POINTS_DEN",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_approved",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "approve",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "balanceOf",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "beneficiary",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "cancelAndRefund",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_keyOwner",
-          "type": "address"
-        },
-        {
-          "internalType": "bytes",
-          "name": "_signature",
-          "type": "bytes"
-        }
-      ],
-      "name": "cancelAndRefundFor",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "destroyLock",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "disableLock",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "erc1820",
-      "outputs": [
-        {
-          "internalType": "contract IERC1820Registry",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "expirationDuration",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "expireKeyFor",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "freeTrialLength",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_keyOwner",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "amount",
-          "type": "uint256"
-        }
-      ],
-      "name": "fullRefund",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "getApproved",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_tokenAddress",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_account",
-          "type": "address"
-        }
-      ],
-      "name": "getBalance",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_keyOwner",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_txSender",
-          "type": "address"
-        }
-      ],
-      "name": "getCancelAndRefundApprovalHash",
-      "outputs": [
-        {
-          "internalType": "bytes32",
-          "name": "approvalHash",
-          "type": "bytes32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "getCancelAndRefundValueFor",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "refund",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "getHasValidKey",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_page",
-          "type": "uint256"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_pageSize",
-          "type": "uint256"
-        }
-      ],
-      "name": "getOwnersByPage",
-      "outputs": [
-        {
-          "internalType": "address[]",
-          "name": "",
-          "type": "address[]"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_account",
-          "type": "address"
-        }
-      ],
-      "name": "getTokenIdFor",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_owner",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_time",
-          "type": "uint256"
-        }
-      ],
-      "name": "getTransferFee",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address[]",
-          "name": "_recipients",
-          "type": "address[]"
-        },
-        {
-          "internalType": "uint256[]",
-          "name": "_expirationTimestamps",
-          "type": "uint256[]"
-        }
-      ],
-      "name": "grantKeys",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_nextAvailableNonce",
-          "type": "uint256"
-        }
-      ],
-      "name": "invalidateOffchainApproval",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "isAlive",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_owner",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_operator",
-          "type": "address"
-        }
-      ],
-      "name": "isApprovedForAll",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        },
-        {
-          "internalType": "address",
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "isKeyOwner",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "isOwner",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "keyCancelInterfaceId",
-      "outputs": [
-        {
-          "internalType": "bytes32",
-          "name": "",
-          "type": "bytes32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "keyExpirationTimestampFor",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "timestamp",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "name": "keyOwnerToNonce",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "keyPrice",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "keySoldInterfaceId",
-      "outputs": [
-        {
-          "internalType": "bytes32",
-          "name": "",
-          "type": "bytes32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "maxNumberOfKeys",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "name",
-      "outputs": [
-        {
-          "internalType": "string",
-          "name": "",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "numberOfOwners",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "owner",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "name": "ownerOf",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "name": "owners",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "publicLockVersion",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "pure",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_value",
-          "type": "uint256"
-        },
-        {
-          "internalType": "address",
-          "name": "_recipient",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_referrer",
-          "type": "address"
-        },
-        {
-          "internalType": "bytes",
-          "name": "_data",
-          "type": "bytes"
-        }
-      ],
-      "name": "purchase",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "refundPenaltyBasisPoints",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "renounceOwnership",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_from",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "safeTransferFrom",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_from",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        },
-        {
-          "internalType": "bytes",
-          "name": "_data",
-          "type": "bytes"
-        }
-      ],
-      "name": "safeTransferFrom",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "internalType": "bool",
-          "name": "_approved",
-          "type": "bool"
-        }
-      ],
-      "name": "setApprovalForAll",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "string",
-          "name": "_baseTokenURI",
-          "type": "string"
-        }
-      ],
-      "name": "setBaseTokenURI",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_timeShared",
-          "type": "uint256"
-        }
-      ],
-      "name": "shareKey",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "bytes4",
-          "name": "interfaceId",
-          "type": "bytes4"
-        }
-      ],
-      "name": "supportsInterface",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "symbol",
-      "outputs": [
-        {
-          "internalType": "string",
-          "name": "",
-          "type": "string"
-        }
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-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "tokenAddress",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
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-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_index",
-          "type": "uint256"
-        }
-      ],
-      "name": "tokenByIndex",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
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-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_owner",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_index",
-          "type": "uint256"
-        }
-      ],
-      "name": "tokenOfOwnerByIndex",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
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-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "tokenURI",
-      "outputs": [
-        {
-          "internalType": "string",
-          "name": "",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "totalSupply",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "transferFeeBasisPoints",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
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-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_from",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_recipient",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "transferFrom",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "newOwner",
-          "type": "address"
-        }
-      ],
-      "name": "transferOwnership",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "unlockProtocol",
-      "outputs": [
-        {
-          "internalType": "contract IUnlock",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_beneficiary",
-          "type": "address"
-        }
-      ],
-      "name": "updateBeneficiary",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_keyPrice",
-          "type": "uint256"
-        }
-      ],
-      "name": "updateKeyPrice",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "string",
-          "name": "_lockName",
-          "type": "string"
-        }
-      ],
-      "name": "updateLockName",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "string",
-          "name": "_lockSymbol",
-          "type": "string"
-        }
-      ],
-      "name": "updateLockSymbol",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_freeTrialLength",
-          "type": "uint256"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_refundPenaltyBasisPoints",
-          "type": "uint256"
-        }
-      ],
-      "name": "updateRefundPenalty",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_transferFeeBasisPoints",
-          "type": "uint256"
-        }
-      ],
-      "name": "updateTransferFee",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_tokenAddress",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_amount",
-          "type": "uint256"
-        }
-      ],
-      "name": "withdraw",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
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-          "internalType": "address",
-          "name": "_owner",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_expirationDuration",
-          "type": "uint256"
-        },
-        {
-          "internalType": "address",
-          "name": "_tokenAddress",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_keyPrice",
-          "type": "uint256"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_maxNumberOfKeys",
-          "type": "uint256"
-        },
-        {
-          "internalType": "string",
-          "name": "_lockName",
-          "type": "string"
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-      "name": "initialize",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "initialize",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
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-    {
-      "constant": false,
-      "inputs": [
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-          "name": "_tokenAddress",
-          "type": "address"
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-      "name": "initialize",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    }
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-  "compiler": {
-    "name": "solc",
-    "version": "0.5.12+commit.7709ece9.Emscripten.clang"
-  },
-  "schemaVersion": "3.0.19",
-  "updatedAt": "2019-12-05T19:29:02.406Z"
-}
diff --git a/packages/contracts/src/abis/PublicLock/PublicLockV6.json b/packages/contracts/src/abis/PublicLock/PublicLockV6.json
deleted file mode 100644
index 9dc24ab3f83..00000000000
--- a/packages/contracts/src/abis/PublicLock/PublicLockV6.json
+++ /dev/null
@@ -1,1687 +0,0 @@
-{
-  "contractName": "PublicLock",
-  "abi": [
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "owner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "approved",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "uint256",
-          "name": "tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "Approval",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "owner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "operator",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "bool",
-          "name": "approved",
-          "type": "bool"
-        }
-      ],
-      "name": "ApprovalForAll",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "uint256",
-          "name": "tokenId",
-          "type": "uint256"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "owner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "sendTo",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "refund",
-          "type": "uint256"
-        }
-      ],
-      "name": "CancelKey",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "balance",
-          "type": "uint256"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "owner",
-          "type": "address"
-        }
-      ],
-      "name": "Destroy",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [],
-      "name": "Disable",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "uint256",
-          "name": "tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "ExpireKey",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "account",
-          "type": "address"
-        }
-      ],
-      "name": "LockManagerAdded",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "account",
-          "type": "address"
-        }
-      ],
-      "name": "LockManagerRemoved",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "string",
-          "name": "symbol",
-          "type": "string"
-        }
-      ],
-      "name": "NewLockSymbol",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "keyOwner",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "nextAvailableNonce",
-          "type": "uint256"
-        }
-      ],
-      "name": "NonceChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "previousOwner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "newOwner",
-          "type": "address"
-        }
-      ],
-      "name": "OwnershipTransferred",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "oldKeyPrice",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "keyPrice",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "internalType": "address",
-          "name": "oldTokenAddress",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "address",
-          "name": "tokenAddress",
-          "type": "address"
-        }
-      ],
-      "name": "PricingChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "freeTrialLength",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "refundPenaltyBasisPoints",
-          "type": "uint256"
-        }
-      ],
-      "name": "RefundPenaltyChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "_amount",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "internalType": "bool",
-          "name": "_timeAdded",
-          "type": "bool"
-        }
-      ],
-      "name": "TimestampChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "from",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "to",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "uint256",
-          "name": "tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "Transfer",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "transferFeeBasisPoints",
-          "type": "uint256"
-        }
-      ],
-      "name": "TransferFeeChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "sender",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "tokenAddress",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "beneficiary",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "amount",
-          "type": "uint256"
-        }
-      ],
-      "name": "Withdrawal",
-      "type": "event"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "BASIS_POINTS_DEN",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "CANCEL_TYPEHASH",
-      "outputs": [
-        {
-          "internalType": "bytes32",
-          "name": "",
-          "type": "bytes32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "account",
-          "type": "address"
-        }
-      ],
-      "name": "addLockManager",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_approved",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "approve",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "balanceOf",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "beneficiary",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "cancelAndRefund",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_keyOwner",
-          "type": "address"
-        },
-        {
-          "internalType": "uint8",
-          "name": "_v",
-          "type": "uint8"
-        },
-        {
-          "internalType": "bytes32",
-          "name": "_r",
-          "type": "bytes32"
-        },
-        {
-          "internalType": "bytes32",
-          "name": "_s",
-          "type": "bytes32"
-        }
-      ],
-      "name": "cancelAndRefundFor",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "destroyLock",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "disableLock",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "erc1820",
-      "outputs": [
-        {
-          "internalType": "contract IERC1820Registry",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "expirationDuration",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "expireKeyFor",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "freeTrialLength",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_keyOwner",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "amount",
-          "type": "uint256"
-        }
-      ],
-      "name": "fullRefund",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "getApproved",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_tokenAddress",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_account",
-          "type": "address"
-        }
-      ],
-      "name": "getBalance",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_keyOwner",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_txSender",
-          "type": "address"
-        }
-      ],
-      "name": "getCancelAndRefundApprovalHash",
-      "outputs": [
-        {
-          "internalType": "bytes32",
-          "name": "approvalHash",
-          "type": "bytes32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "getCancelAndRefundValueFor",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "refund",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "getHasValidKey",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_page",
-          "type": "uint256"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_pageSize",
-          "type": "uint256"
-        }
-      ],
-      "name": "getOwnersByPage",
-      "outputs": [
-        {
-          "internalType": "address[]",
-          "name": "",
-          "type": "address[]"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_account",
-          "type": "address"
-        }
-      ],
-      "name": "getTokenIdFor",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_owner",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_time",
-          "type": "uint256"
-        }
-      ],
-      "name": "getTransferFee",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address[]",
-          "name": "_recipients",
-          "type": "address[]"
-        },
-        {
-          "internalType": "uint256[]",
-          "name": "_expirationTimestamps",
-          "type": "uint256[]"
-        }
-      ],
-      "name": "grantKeys",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_nextAvailableNonce",
-          "type": "uint256"
-        }
-      ],
-      "name": "invalidateOffchainApproval",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "isAlive",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_owner",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_operator",
-          "type": "address"
-        }
-      ],
-      "name": "isApprovedForAll",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        },
-        {
-          "internalType": "address",
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "isKeyOwner",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "account",
-          "type": "address"
-        }
-      ],
-      "name": "isLockManager",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "isOwner",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "keyCancelInterfaceId",
-      "outputs": [
-        {
-          "internalType": "bytes32",
-          "name": "",
-          "type": "bytes32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "keyExpirationTimestampFor",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "timestamp",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "name": "keyOwnerToNonce",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "keyPrice",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "keySoldInterfaceId",
-      "outputs": [
-        {
-          "internalType": "bytes32",
-          "name": "",
-          "type": "bytes32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "maxNumberOfKeys",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "name",
-      "outputs": [
-        {
-          "internalType": "string",
-          "name": "",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "numberOfOwners",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "owner",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "ownerOf",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "name": "owners",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "publicLockVersion",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "pure",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_value",
-          "type": "uint256"
-        },
-        {
-          "internalType": "address",
-          "name": "_recipient",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_referrer",
-          "type": "address"
-        },
-        {
-          "internalType": "bytes",
-          "name": "_data",
-          "type": "bytes"
-        }
-      ],
-      "name": "purchase",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "refundPenaltyBasisPoints",
-      "outputs": [
-        {
-          "internalType": "uint256",
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-  "compiler": {
-    "name": "solc",
-    "version": "0.5.14+commit.01f1aaa4.Emscripten.clang"
-  },
-  "schemaVersion": "3.0.20",
-  "updatedAt": "2020-01-15T23:36:50.899Z"
-}
diff --git a/packages/contracts/src/abis/PublicLock/PublicLockV7.json b/packages/contracts/src/abis/PublicLock/PublicLockV7.json
deleted file mode 100644
index 8a42f40b879..00000000000
--- a/packages/contracts/src/abis/PublicLock/PublicLockV7.json
+++ /dev/null
@@ -1,1739 +0,0 @@
-{
-  "contractName": "PublicLock",
-  "abi": [
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "owner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "approved",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "uint256",
-          "name": "tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "Approval",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "owner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "operator",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "bool",
-          "name": "approved",
-          "type": "bool"
-        }
-      ],
-      "name": "ApprovalForAll",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "uint256",
-          "name": "tokenId",
-          "type": "uint256"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "owner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "sendTo",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "refund",
-          "type": "uint256"
-        }
-      ],
-      "name": "CancelKey",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [],
-      "name": "Disable",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "_amount",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "internalType": "bool",
-          "name": "_timeAdded",
-          "type": "bool"
-        }
-      ],
-      "name": "ExpirationChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "uint256",
-          "name": "tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "ExpireKey",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "account",
-          "type": "address"
-        }
-      ],
-      "name": "KeyGranterAdded",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "account",
-          "type": "address"
-        }
-      ],
-      "name": "KeyGranterRemoved",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "_newManager",
-          "type": "address"
-        }
-      ],
-      "name": "KeyManagerChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "account",
-          "type": "address"
-        }
-      ],
-      "name": "LockManagerAdded",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "account",
-          "type": "address"
-        }
-      ],
-      "name": "LockManagerRemoved",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "string",
-          "name": "symbol",
-          "type": "string"
-        }
-      ],
-      "name": "NewLockSymbol",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "keyManager",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "nextAvailableNonce",
-          "type": "uint256"
-        }
-      ],
-      "name": "NonceChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "oldKeyPrice",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "keyPrice",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "internalType": "address",
-          "name": "oldTokenAddress",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "address",
-          "name": "tokenAddress",
-          "type": "address"
-        }
-      ],
-      "name": "PricingChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "freeTrialLength",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "refundPenaltyBasisPoints",
-          "type": "uint256"
-        }
-      ],
-      "name": "RefundPenaltyChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "owner",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "newExpiration",
-          "type": "uint256"
-        }
-      ],
-      "name": "RenewKeyPurchase",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "from",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "to",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "uint256",
-          "name": "tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "Transfer",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "transferFeeBasisPoints",
-          "type": "uint256"
-        }
-      ],
-      "name": "TransferFeeChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "sender",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "tokenAddress",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "beneficiary",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "amount",
-          "type": "uint256"
-        }
-      ],
-      "name": "Withdrawal",
-      "type": "event"
-    },
-    {
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "fallback"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "account",
-          "type": "address"
-        }
-      ],
-      "name": "addKeyGranter",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "account",
-          "type": "address"
-        }
-      ],
-      "name": "addLockManager",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_approved",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "approve",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_keyOwner",
-          "type": "address"
-        }
-      ],
-      "name": "balanceOf",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "beneficiary",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "cancelAndRefund",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_keyManager",
-          "type": "address"
-        },
-        {
-          "internalType": "uint8",
-          "name": "_v",
-          "type": "uint8"
-        },
-        {
-          "internalType": "bytes32",
-          "name": "_r",
-          "type": "bytes32"
-        },
-        {
-          "internalType": "bytes32",
-          "name": "_s",
-          "type": "bytes32"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "cancelAndRefundFor",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "disableLock",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "expirationDuration",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_keyOwner",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "amount",
-          "type": "uint256"
-        }
-      ],
-      "name": "expireAndRefundFor",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "freeTrialLength",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "getApproved",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_tokenAddress",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_account",
-          "type": "address"
-        }
-      ],
-      "name": "getBalance",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_keyManager",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_txSender",
-          "type": "address"
-        }
-      ],
-      "name": "getCancelAndRefundApprovalHash",
-      "outputs": [
-        {
-          "internalType": "bytes32",
-          "name": "approvalHash",
-          "type": "bytes32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_keyOwner",
-          "type": "address"
-        }
-      ],
-      "name": "getCancelAndRefundValueFor",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "refund",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_keyOwner",
-          "type": "address"
-        }
-      ],
-      "name": "getHasValidKey",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_page",
-          "type": "uint256"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_pageSize",
-          "type": "uint256"
-        }
-      ],
-      "name": "getOwnersByPage",
-      "outputs": [
-        {
-          "internalType": "address[]",
-          "name": "",
-          "type": "address[]"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_account",
-          "type": "address"
-        }
-      ],
-      "name": "getTokenIdFor",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_keyOwner",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_time",
-          "type": "uint256"
-        }
-      ],
-      "name": "getTransferFee",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address[]",
-          "name": "_recipients",
-          "type": "address[]"
-        },
-        {
-          "internalType": "uint256[]",
-          "name": "_expirationTimestamps",
-          "type": "uint256[]"
-        },
-        {
-          "internalType": "address[]",
-          "name": "_keyManagers",
-          "type": "address[]"
-        }
-      ],
-      "name": "grantKeys",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_nextAvailableNonce",
-          "type": "uint256"
-        }
-      ],
-      "name": "invalidateOffchainApproval",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "isAlive",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_owner",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_operator",
-          "type": "address"
-        }
-      ],
-      "name": "isApprovedForAll",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "account",
-          "type": "address"
-        }
-      ],
-      "name": "isKeyGranter",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        },
-        {
-          "internalType": "address",
-          "name": "_keyOwner",
-          "type": "address"
-        }
-      ],
-      "name": "isKeyOwner",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "account",
-          "type": "address"
-        }
-      ],
-      "name": "isLockManager",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_keyOwner",
-          "type": "address"
-        }
-      ],
-      "name": "keyExpirationTimestampFor",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "name": "keyManagerOf",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "name": "keyManagerToNonce",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "keyPrice",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "maxNumberOfKeys",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "name",
-      "outputs": [
-        {
-          "internalType": "string",
-          "name": "",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "numberOfOwners",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "onKeyCancelHook",
-      "outputs": [
-        {
-          "internalType": "contract ILockKeyCancelHook",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "onKeyPurchaseHook",
-      "outputs": [
-        {
-          "internalType": "contract ILockKeyPurchaseHook",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "ownerOf",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "name": "owners",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "publicLockVersion",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "pure",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_value",
-          "type": "uint256"
-        },
-        {
-          "internalType": "address",
-          "name": "_recipient",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_referrer",
-          "type": "address"
-        },
-        {
-          "internalType": "bytes",
-          "name": "_data",
-          "type": "bytes"
-        }
-      ],
-      "name": "purchase",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_recipient",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_referrer",
-          "type": "address"
-        },
-        {
-          "internalType": "bytes",
-          "name": "_data",
-          "type": "bytes"
-        }
-      ],
-      "name": "purchasePriceFor",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "minKeyPrice",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "refundPenaltyBasisPoints",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "renounceLockManager",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_granter",
-          "type": "address"
-        }
-      ],
-      "name": "revokeKeyGranter",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_from",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "safeTransferFrom",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_from",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        },
-        {
-          "internalType": "bytes",
-          "name": "_data",
-          "type": "bytes"
-        }
-      ],
-      "name": "safeTransferFrom",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "internalType": "bool",
-          "name": "_approved",
-          "type": "bool"
-        }
-      ],
-      "name": "setApprovalForAll",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "string",
-          "name": "_baseTokenURI",
-          "type": "string"
-        }
-      ],
-      "name": "setBaseTokenURI",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_onKeyPurchaseHook",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_onKeyCancelHook",
-          "type": "address"
-        }
-      ],
-      "name": "setEventHooks",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        },
-        {
-          "internalType": "address",
-          "name": "_keyManager",
-          "type": "address"
-        }
-      ],
-      "name": "setKeyManagerOf",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_timeShared",
-          "type": "uint256"
-        }
-      ],
-      "name": "shareKey",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "bytes4",
-          "name": "interfaceId",
-          "type": "bytes4"
-        }
-      ],
-      "name": "supportsInterface",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "symbol",
-      "outputs": [
-        {
-          "internalType": "string",
-          "name": "",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "tokenAddress",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_index",
-          "type": "uint256"
-        }
-      ],
-      "name": "tokenByIndex",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_keyOwner",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_index",
-          "type": "uint256"
-        }
-      ],
-      "name": "tokenOfOwnerByIndex",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "tokenURI",
-      "outputs": [
-        {
-          "internalType": "string",
-          "name": "",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "totalSupply",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "transferFeeBasisPoints",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_from",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_recipient",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "transferFrom",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "unlockProtocol",
-      "outputs": [
-        {
-          "internalType": "contract IUnlock",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_beneficiary",
-          "type": "address"
-        }
-      ],
-      "name": "updateBeneficiary",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_keyPrice",
-          "type": "uint256"
-        },
-        {
-          "internalType": "address",
-          "name": "_tokenAddress",
-          "type": "address"
-        }
-      ],
-      "name": "updateKeyPricing",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "string",
-          "name": "_lockName",
-          "type": "string"
-        }
-      ],
-      "name": "updateLockName",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "string",
-          "name": "_lockSymbol",
-          "type": "string"
-        }
-      ],
-      "name": "updateLockSymbol",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_freeTrialLength",
-          "type": "uint256"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_refundPenaltyBasisPoints",
-          "type": "uint256"
-        }
-      ],
-      "name": "updateRefundPenalty",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_transferFeeBasisPoints",
-          "type": "uint256"
-        }
-      ],
-      "name": "updateTransferFee",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_tokenAddress",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_amount",
-          "type": "uint256"
-        }
-      ],
-      "name": "withdraw",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_lockCreator",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_expirationDuration",
-          "type": "uint256"
-        },
-        {
-          "internalType": "address",
-          "name": "_tokenAddress",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_keyPrice",
-          "type": "uint256"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_maxNumberOfKeys",
-          "type": "uint256"
-        },
-        {
-          "internalType": "string",
-          "name": "_lockName",
-          "type": "string"
-        }
-      ],
-      "name": "initialize",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "initialize",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    }
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-  "compiler": {
-    "name": "solc",
-    "version": "0.5.17+commit.d19bba13.Emscripten.clang"
-  },
-  "schemaVersion": "3.0.23",
-  "updatedAt": "2020-03-26T17:11:58.385Z"
-}
diff --git a/packages/contracts/src/abis/PublicLock/PublicLockV8.json b/packages/contracts/src/abis/PublicLock/PublicLockV8.json
deleted file mode 100644
index 5ce93c7d56b..00000000000
--- a/packages/contracts/src/abis/PublicLock/PublicLockV8.json
+++ /dev/null
@@ -1,1791 +0,0 @@
-{
-  "contractName": "PublicLock",
-  "abi": [
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "owner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "approved",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "uint256",
-          "name": "tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "Approval",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "owner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "operator",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "bool",
-          "name": "approved",
-          "type": "bool"
-        }
-      ],
-      "name": "ApprovalForAll",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "uint256",
-          "name": "tokenId",
-          "type": "uint256"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "owner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "sendTo",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "refund",
-          "type": "uint256"
-        }
-      ],
-      "name": "CancelKey",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [],
-      "name": "Disable",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "_amount",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "internalType": "bool",
-          "name": "_timeAdded",
-          "type": "bool"
-        }
-      ],
-      "name": "ExpirationChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "uint256",
-          "name": "tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "ExpireKey",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "account",
-          "type": "address"
-        }
-      ],
-      "name": "KeyGranterAdded",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "account",
-          "type": "address"
-        }
-      ],
-      "name": "KeyGranterRemoved",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "_newManager",
-          "type": "address"
-        }
-      ],
-      "name": "KeyManagerChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "account",
-          "type": "address"
-        }
-      ],
-      "name": "LockManagerAdded",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "account",
-          "type": "address"
-        }
-      ],
-      "name": "LockManagerRemoved",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "string",
-          "name": "symbol",
-          "type": "string"
-        }
-      ],
-      "name": "NewLockSymbol",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "keyManager",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "nextAvailableNonce",
-          "type": "uint256"
-        }
-      ],
-      "name": "NonceChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "oldKeyPrice",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "keyPrice",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "internalType": "address",
-          "name": "oldTokenAddress",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "address",
-          "name": "tokenAddress",
-          "type": "address"
-        }
-      ],
-      "name": "PricingChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "freeTrialLength",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "refundPenaltyBasisPoints",
-          "type": "uint256"
-        }
-      ],
-      "name": "RefundPenaltyChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "owner",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "newExpiration",
-          "type": "uint256"
-        }
-      ],
-      "name": "RenewKeyPurchase",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "from",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "to",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "uint256",
-          "name": "tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "Transfer",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "transferFeeBasisPoints",
-          "type": "uint256"
-        }
-      ],
-      "name": "TransferFeeChanged",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "sender",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "tokenAddress",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "beneficiary",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "amount",
-          "type": "uint256"
-        }
-      ],
-      "name": "Withdrawal",
-      "type": "event"
-    },
-    {
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "fallback"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "account",
-          "type": "address"
-        }
-      ],
-      "name": "addKeyGranter",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "account",
-          "type": "address"
-        }
-      ],
-      "name": "addLockManager",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_approved",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "approve",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_spender",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_amount",
-          "type": "uint256"
-        }
-      ],
-      "name": "approveBeneficiary",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_keyOwner",
-          "type": "address"
-        }
-      ],
-      "name": "balanceOf",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "beneficiary",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "cancelAndRefund",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_keyManager",
-          "type": "address"
-        },
-        {
-          "internalType": "uint8",
-          "name": "_v",
-          "type": "uint8"
-        },
-        {
-          "internalType": "bytes32",
-          "name": "_r",
-          "type": "bytes32"
-        },
-        {
-          "internalType": "bytes32",
-          "name": "_s",
-          "type": "bytes32"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "cancelAndRefundFor",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "disableLock",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "expirationDuration",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_keyOwner",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "amount",
-          "type": "uint256"
-        }
-      ],
-      "name": "expireAndRefundFor",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "freeTrialLength",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "getApproved",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_tokenAddress",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_account",
-          "type": "address"
-        }
-      ],
-      "name": "getBalance",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_keyManager",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_txSender",
-          "type": "address"
-        }
-      ],
-      "name": "getCancelAndRefundApprovalHash",
-      "outputs": [
-        {
-          "internalType": "bytes32",
-          "name": "approvalHash",
-          "type": "bytes32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_keyOwner",
-          "type": "address"
-        }
-      ],
-      "name": "getCancelAndRefundValueFor",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "refund",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_keyOwner",
-          "type": "address"
-        }
-      ],
-      "name": "getHasValidKey",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_page",
-          "type": "uint256"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_pageSize",
-          "type": "uint256"
-        }
-      ],
-      "name": "getOwnersByPage",
-      "outputs": [
-        {
-          "internalType": "address[]",
-          "name": "",
-          "type": "address[]"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_account",
-          "type": "address"
-        }
-      ],
-      "name": "getTokenIdFor",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_keyOwner",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_time",
-          "type": "uint256"
-        }
-      ],
-      "name": "getTransferFee",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address[]",
-          "name": "_recipients",
-          "type": "address[]"
-        },
-        {
-          "internalType": "uint256[]",
-          "name": "_expirationTimestamps",
-          "type": "uint256[]"
-        },
-        {
-          "internalType": "address[]",
-          "name": "_keyManagers",
-          "type": "address[]"
-        }
-      ],
-      "name": "grantKeys",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_nextAvailableNonce",
-          "type": "uint256"
-        }
-      ],
-      "name": "invalidateOffchainApproval",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "isAlive",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_owner",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_operator",
-          "type": "address"
-        }
-      ],
-      "name": "isApprovedForAll",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "account",
-          "type": "address"
-        }
-      ],
-      "name": "isKeyGranter",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        },
-        {
-          "internalType": "address",
-          "name": "_keyOwner",
-          "type": "address"
-        }
-      ],
-      "name": "isKeyOwner",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "account",
-          "type": "address"
-        }
-      ],
-      "name": "isLockManager",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_keyOwner",
-          "type": "address"
-        }
-      ],
-      "name": "keyExpirationTimestampFor",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "name": "keyManagerOf",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "name": "keyManagerToNonce",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "keyPrice",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "maxNumberOfKeys",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "name",
-      "outputs": [
-        {
-          "internalType": "string",
-          "name": "",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "numberOfOwners",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "onKeyCancelHook",
-      "outputs": [
-        {
-          "internalType": "contract ILockKeyCancelHook",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "onKeyPurchaseHook",
-      "outputs": [
-        {
-          "internalType": "contract ILockKeyPurchaseHook",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "ownerOf",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "name": "owners",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "publicLockVersion",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "pure",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_value",
-          "type": "uint256"
-        },
-        {
-          "internalType": "address",
-          "name": "_recipient",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_referrer",
-          "type": "address"
-        },
-        {
-          "internalType": "bytes",
-          "name": "_data",
-          "type": "bytes"
-        }
-      ],
-      "name": "purchase",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_recipient",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_referrer",
-          "type": "address"
-        },
-        {
-          "internalType": "bytes",
-          "name": "_data",
-          "type": "bytes"
-        }
-      ],
-      "name": "purchasePriceFor",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "minKeyPrice",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "refundPenaltyBasisPoints",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "renounceLockManager",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_granter",
-          "type": "address"
-        }
-      ],
-      "name": "revokeKeyGranter",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_from",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "safeTransferFrom",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_from",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        },
-        {
-          "internalType": "bytes",
-          "name": "_data",
-          "type": "bytes"
-        }
-      ],
-      "name": "safeTransferFrom",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "internalType": "bool",
-          "name": "_approved",
-          "type": "bool"
-        }
-      ],
-      "name": "setApprovalForAll",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "string",
-          "name": "_baseTokenURI",
-          "type": "string"
-        }
-      ],
-      "name": "setBaseTokenURI",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_onKeyPurchaseHook",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_onKeyCancelHook",
-          "type": "address"
-        }
-      ],
-      "name": "setEventHooks",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        },
-        {
-          "internalType": "address",
-          "name": "_keyManager",
-          "type": "address"
-        }
-      ],
-      "name": "setKeyManagerOf",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_timeShared",
-          "type": "uint256"
-        }
-      ],
-      "name": "shareKey",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "bytes4",
-          "name": "interfaceId",
-          "type": "bytes4"
-        }
-      ],
-      "name": "supportsInterface",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "symbol",
-      "outputs": [
-        {
-          "internalType": "string",
-          "name": "",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "tokenAddress",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_index",
-          "type": "uint256"
-        }
-      ],
-      "name": "tokenByIndex",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_keyOwner",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_index",
-          "type": "uint256"
-        }
-      ],
-      "name": "tokenOfOwnerByIndex",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "tokenURI",
-      "outputs": [
-        {
-          "internalType": "string",
-          "name": "",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "totalSupply",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_value",
-          "type": "uint256"
-        }
-      ],
-      "name": "transfer",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "success",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "transferFeeBasisPoints",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_from",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_recipient",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_tokenId",
-          "type": "uint256"
-        }
-      ],
-      "name": "transferFrom",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "unlockProtocol",
-      "outputs": [
-        {
-          "internalType": "contract IUnlock",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_beneficiary",
-          "type": "address"
-        }
-      ],
-      "name": "updateBeneficiary",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_keyPrice",
-          "type": "uint256"
-        },
-        {
-          "internalType": "address",
-          "name": "_tokenAddress",
-          "type": "address"
-        }
-      ],
-      "name": "updateKeyPricing",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "string",
-          "name": "_lockName",
-          "type": "string"
-        }
-      ],
-      "name": "updateLockName",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "string",
-          "name": "_lockSymbol",
-          "type": "string"
-        }
-      ],
-      "name": "updateLockSymbol",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_freeTrialLength",
-          "type": "uint256"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_refundPenaltyBasisPoints",
-          "type": "uint256"
-        }
-      ],
-      "name": "updateRefundPenalty",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_transferFeeBasisPoints",
-          "type": "uint256"
-        }
-      ],
-      "name": "updateTransferFee",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_tokenAddress",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_amount",
-          "type": "uint256"
-        }
-      ],
-      "name": "withdraw",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_lockCreator",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_expirationDuration",
-          "type": "uint256"
-        },
-        {
-          "internalType": "address",
-          "name": "_tokenAddress",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_keyPrice",
-          "type": "uint256"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_maxNumberOfKeys",
-          "type": "uint256"
-        },
-        {
-          "internalType": "string",
-          "name": "_lockName",
-          "type": "string"
-        }
-      ],
-      "name": "initialize",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "initialize",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    }
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-  "compiler": {
-    "name": "solc",
-    "version": "0.5.17+commit.d19bba13.Emscripten.clang"
-  },
-  "schemaVersion": "3.2.0",
-  "updatedAt": "2020-07-11T18:54:37.073Z"
-}
diff --git a/packages/contracts/src/abis/Unlock/UnlockV0.json b/packages/contracts/src/abis/Unlock/UnlockV0.json
deleted file mode 100644
index ed41ea9c9ae..00000000000
--- a/packages/contracts/src/abis/Unlock/UnlockV0.json
+++ /dev/null
@@ -1,269 +0,0 @@
-{
-  "contractName": "Unlock",
-  "abi": [
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "name": "locks",
-      "outputs": [
-        {
-          "name": "deployed",
-          "type": "bool"
-        },
-        {
-          "name": "totalSales",
-          "type": "uint256"
-        },
-        {
-          "name": "yieldedDiscountTokens",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "renounceOwnership",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "owner",
-      "outputs": [
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-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "isOwner",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "totalDiscountGranted",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "grossNetworkProduct",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "newOwner",
-          "type": "address"
-        }
-      ],
-      "name": "transferOwnership",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "name": "lockOwner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "name": "newLockAddress",
-          "type": "address"
-        }
-      ],
-      "name": "NewLock",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "name": "previousOwner",
-          "type": "address"
-        }
-      ],
-      "name": "OwnershipRenounced",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "name": "previousOwner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "name": "newOwner",
-          "type": "address"
-        }
-      ],
-      "name": "OwnershipTransferred",
-      "type": "event"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "initialize",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_expirationDuration",
-          "type": "uint256"
-        },
-        {
-          "name": "_keyPrice",
-          "type": "uint256"
-        },
-        {
-          "name": "_maxNumberOfKeys",
-          "type": "uint256"
-        }
-      ],
-      "name": "createLock",
-      "outputs": [
-        {
-          "name": "lock",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_purchaser",
-          "type": "address"
-        },
-        {
-          "name": "_keyPrice",
-          "type": "uint256"
-        }
-      ],
-      "name": "computeAvailableDiscountFor",
-      "outputs": [
-        {
-          "name": "discount",
-          "type": "uint256"
-        },
-        {
-          "name": "tokens",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_value",
-          "type": "uint256"
-        },
-        {
-          "name": "_referrer",
-          "type": "address"
-        }
-      ],
-      "name": "recordKeyPurchase",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_discount",
-          "type": "uint256"
-        },
-        {
-          "name": "_tokens",
-          "type": "uint256"
-        }
-      ],
-      "name": "recordConsumedDiscount",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    }
-  ],
-  "bytecode": 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-  "compiler": {
-    "name": "solc",
-    "version": "0.4.25+commit.59dbf8f1.Emscripten.clang"
-  },
-  "schemaVersion": "2.0.2",
-  "updatedAt": "2019-03-02T13:33:23.721Z"
-}
diff --git a/packages/contracts/src/abis/Unlock/UnlockV1.json b/packages/contracts/src/abis/Unlock/UnlockV1.json
deleted file mode 100644
index 234a262c446..00000000000
--- a/packages/contracts/src/abis/Unlock/UnlockV1.json
+++ /dev/null
@@ -1,266 +0,0 @@
-{
-  "contractName": "Unlock",
-  "abi": [
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "name": "locks",
-      "outputs": [
-        {
-          "name": "deployed",
-          "type": "bool"
-        },
-        {
-          "name": "totalSales",
-          "type": "uint256"
-        },
-        {
-          "name": "yieldedDiscountTokens",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "renounceOwnership",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "owner",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "isOwner",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "totalDiscountGranted",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "grossNetworkProduct",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "newOwner",
-          "type": "address"
-        }
-      ],
-      "name": "transferOwnership",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "fallback"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "name": "lockOwner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "name": "newLockAddress",
-          "type": "address"
-        }
-      ],
-      "name": "NewLock",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "name": "previousOwner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "name": "newOwner",
-          "type": "address"
-        }
-      ],
-      "name": "OwnershipTransferred",
-      "type": "event"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "initialize",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_expirationDuration",
-          "type": "uint256"
-        },
-        {
-          "name": "_tokenAddress",
-          "type": "address"
-        },
-        {
-          "name": "_keyPrice",
-          "type": "uint256"
-        },
-        {
-          "name": "_maxNumberOfKeys",
-          "type": "uint256"
-        }
-      ],
-      "name": "createLock",
-      "outputs": [
-        {
-          "name": "lock",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_purchaser",
-          "type": "address"
-        },
-        {
-          "name": "_keyPrice",
-          "type": "uint256"
-        }
-      ],
-      "name": "computeAvailableDiscountFor",
-      "outputs": [
-        {
-          "name": "discount",
-          "type": "uint256"
-        },
-        {
-          "name": "tokens",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_value",
-          "type": "uint256"
-        },
-        {
-          "name": "_referrer",
-          "type": "address"
-        }
-      ],
-      "name": "recordKeyPurchase",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_discount",
-          "type": "uint256"
-        },
-        {
-          "name": "_tokens",
-          "type": "uint256"
-        }
-      ],
-      "name": "recordConsumedDiscount",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    }
-  ],
-  "bytecode": 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-  "updatedAt": "2019-04-04T15:05:08.514Z"
-}
diff --git a/packages/contracts/src/abis/Unlock/UnlockV2.json b/packages/contracts/src/abis/Unlock/UnlockV2.json
deleted file mode 100644
index ccbbfb926a1..00000000000
--- a/packages/contracts/src/abis/Unlock/UnlockV2.json
+++ /dev/null
@@ -1,280 +0,0 @@
-{
-  "contractName": "Unlock",
-  "abi": [
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "name": "locks",
-      "outputs": [
-        {
-          "name": "deployed",
-          "type": "bool"
-        },
-        {
-          "name": "totalSales",
-          "type": "uint256"
-        },
-        {
-          "name": "yieldedDiscountTokens",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "renounceOwnership",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "owner",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "isOwner",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "totalDiscountGranted",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "grossNetworkProduct",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "newOwner",
-          "type": "address"
-        }
-      ],
-      "name": "transferOwnership",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "fallback"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "name": "lockOwner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "name": "newLockAddress",
-          "type": "address"
-        }
-      ],
-      "name": "NewLock",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "name": "previousOwner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "name": "newOwner",
-          "type": "address"
-        }
-      ],
-      "name": "OwnershipTransferred",
-      "type": "event"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "initialize",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_expirationDuration",
-          "type": "uint256"
-        },
-        {
-          "name": "_tokenAddress",
-          "type": "address"
-        },
-        {
-          "name": "_keyPrice",
-          "type": "uint256"
-        },
-        {
-          "name": "_maxNumberOfKeys",
-          "type": "uint256"
-        }
-      ],
-      "name": "createLock",
-      "outputs": [
-        {
-          "name": "lock",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_purchaser",
-          "type": "address"
-        },
-        {
-          "name": "_keyPrice",
-          "type": "uint256"
-        }
-      ],
-      "name": "computeAvailableDiscountFor",
-      "outputs": [
-        {
-          "name": "discount",
-          "type": "uint256"
-        },
-        {
-          "name": "tokens",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_value",
-          "type": "uint256"
-        },
-        {
-          "name": "_referrer",
-          "type": "address"
-        }
-      ],
-      "name": "recordKeyPurchase",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_discount",
-          "type": "uint256"
-        },
-        {
-          "name": "_tokens",
-          "type": "uint256"
-        }
-      ],
-      "name": "recordConsumedDiscount",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "unlockVersion",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint8"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "pure",
-      "type": "function"
-    }
-  ],
-  "bytecode": 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-  "compiler": {
-    "name": "solc",
-    "version": "0.5.7+commit.6da8b019.Emscripten.clang"
-  },
-  "schemaVersion": "3.0.6",
-  "updatedAt": "2019-04-18T21:59:58.637Z"
-}
diff --git a/packages/contracts/src/abis/Unlock/UnlockV3.json b/packages/contracts/src/abis/Unlock/UnlockV3.json
deleted file mode 100644
index c1ddac2b3a1..00000000000
--- a/packages/contracts/src/abis/Unlock/UnlockV3.json
+++ /dev/null
@@ -1,359 +0,0 @@
-{
-  "contractName": "Unlock",
-  "abi": [
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "name": "locks",
-      "outputs": [
-        {
-          "name": "deployed",
-          "type": "bool"
-        },
-        {
-          "name": "totalSales",
-          "type": "uint256"
-        },
-        {
-          "name": "yieldedDiscountTokens",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "renounceOwnership",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "owner",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "isOwner",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "totalDiscountGranted",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "grossNetworkProduct",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "newOwner",
-          "type": "address"
-        }
-      ],
-      "name": "transferOwnership",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "fallback"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "name": "lockOwner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "name": "newLockAddress",
-          "type": "address"
-        }
-      ],
-      "name": "NewLock",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "name": "tokenURI",
-          "type": "string"
-        }
-      ],
-      "name": "NewTokenURI",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "name": "tokenSymbol",
-          "type": "string"
-        }
-      ],
-      "name": "NewGlobalTokenSymbol",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "name": "previousOwner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "name": "newOwner",
-          "type": "address"
-        }
-      ],
-      "name": "OwnershipTransferred",
-      "type": "event"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "initialize",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_expirationDuration",
-          "type": "uint256"
-        },
-        {
-          "name": "_tokenAddress",
-          "type": "address"
-        },
-        {
-          "name": "_keyPrice",
-          "type": "uint256"
-        },
-        {
-          "name": "_maxNumberOfKeys",
-          "type": "uint256"
-        },
-        {
-          "name": "_lockName",
-          "type": "string"
-        }
-      ],
-      "name": "createLock",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_purchaser",
-          "type": "address"
-        },
-        {
-          "name": "_keyPrice",
-          "type": "uint256"
-        }
-      ],
-      "name": "computeAvailableDiscountFor",
-      "outputs": [
-        {
-          "name": "discount",
-          "type": "uint256"
-        },
-        {
-          "name": "tokens",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_value",
-          "type": "uint256"
-        },
-        {
-          "name": "_referrer",
-          "type": "address"
-        }
-      ],
-      "name": "recordKeyPurchase",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_discount",
-          "type": "uint256"
-        },
-        {
-          "name": "_tokens",
-          "type": "uint256"
-        }
-      ],
-      "name": "recordConsumedDiscount",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "unlockVersion",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint16"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "pure",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "getGlobalBaseTokenURI",
-      "outputs": [
-        {
-          "name": "",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_URI",
-          "type": "string"
-        }
-      ],
-      "name": "setGlobalBaseTokenURI",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "getGlobalTokenSymbol",
-      "outputs": [
-        {
-          "name": "",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_symbol",
-          "type": "string"
-        }
-      ],
-      "name": "setGlobalTokenSymbol",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    }
-  ],
-  "bytecode": 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-  "compiler": {
-    "name": "solc",
-    "version": "0.5.7+commit.6da8b019.Emscripten.clang"
-  },
-  "schemaVersion": "3.0.9",
-  "updatedAt": "2019-05-21T02:16:43.435Z"
-}
diff --git a/packages/contracts/src/abis/Unlock/UnlockV4.json b/packages/contracts/src/abis/Unlock/UnlockV4.json
deleted file mode 100644
index 5f2c527c312..00000000000
--- a/packages/contracts/src/abis/Unlock/UnlockV4.json
+++ /dev/null
@@ -1,359 +0,0 @@
-{
-  "contractName": "Unlock",
-  "abi": [
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "name": "locks",
-      "outputs": [
-        {
-          "name": "deployed",
-          "type": "bool"
-        },
-        {
-          "name": "totalSales",
-          "type": "uint256"
-        },
-        {
-          "name": "yieldedDiscountTokens",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "renounceOwnership",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "owner",
-      "outputs": [
-        {
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "isOwner",
-      "outputs": [
-        {
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "totalDiscountGranted",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "grossNetworkProduct",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "newOwner",
-          "type": "address"
-        }
-      ],
-      "name": "transferOwnership",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "fallback"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "name": "lockOwner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "name": "newLockAddress",
-          "type": "address"
-        }
-      ],
-      "name": "NewLock",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "name": "tokenURI",
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-      "inputs": [
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-          "name": "_URI",
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-      "type": "function"
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-    {
-      "constant": true,
-      "inputs": [],
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-      "stateMutability": "view",
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-      "payable": false,
-      "stateMutability": "nonpayable",
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-  "compiler": {
-    "name": "solc",
-    "version": "0.5.9+commit.e560f70d.Emscripten.clang"
-  },
-  "schemaVersion": "3.0.10",
-  "updatedAt": "2019-06-05T17:55:27.566Z"
-}
diff --git a/packages/contracts/src/abis/Unlock/UnlockV5.json b/packages/contracts/src/abis/Unlock/UnlockV5.json
deleted file mode 100644
index eb5431b16ff..00000000000
--- a/packages/contracts/src/abis/Unlock/UnlockV5.json
+++ /dev/null
@@ -1,482 +0,0 @@
-{
-  "contractName": "Unlock",
-  "abi": [
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "address",
-          "name": "publicLockAddress",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "string",
-          "name": "globalTokenSymbol",
-          "type": "string"
-        },
-        {
-          "indexed": false,
-          "internalType": "string",
-          "name": "globalTokenURI",
-          "type": "string"
-        }
-      ],
-      "name": "ConfigUnlock",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "lockOwner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "newLockAddress",
-          "type": "address"
-        }
-      ],
-      "name": "NewLock",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "previousOwner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "newOwner",
-          "type": "address"
-        }
-      ],
-      "name": "OwnershipTransferred",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "grossNetworkProduct",
-          "type": "uint256"
-        },
-        {
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-      "name": "globalBaseTokenURI",
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-  "compiler": {
-    "name": "solc",
-    "version": "0.5.12+commit.7709ece9.Emscripten.clang"
-  },
-  "schemaVersion": "3.0.19",
-  "updatedAt": "2019-12-05T19:29:02.410Z"
-}
diff --git a/packages/contracts/src/abis/Unlock/UnlockV6.json b/packages/contracts/src/abis/Unlock/UnlockV6.json
deleted file mode 100644
index 32d9f76db74..00000000000
--- a/packages/contracts/src/abis/Unlock/UnlockV6.json
+++ /dev/null
@@ -1,482 +0,0 @@
-{
-  "contractName": "Unlock",
-  "abi": [
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "address",
-          "name": "publicLockAddress",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "string",
-          "name": "globalTokenSymbol",
-          "type": "string"
-        },
-        {
-          "indexed": false,
-          "internalType": "string",
-          "name": "globalTokenURI",
-          "type": "string"
-        }
-      ],
-      "name": "ConfigUnlock",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "lockOwner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "newLockAddress",
-          "type": "address"
-        }
-      ],
-      "name": "NewLock",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "previousOwner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "newOwner",
-          "type": "address"
-        }
-      ],
-      "name": "OwnershipTransferred",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "grossNetworkProduct",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "totalDiscountGranted",
-          "type": "uint256"
-        }
-      ],
-      "name": "ResetTrackedValue",
-      "type": "event"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "globalBaseTokenURI",
-      "outputs": [
-        {
-          "internalType": "string",
-          "name": "",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "globalTokenSymbol",
-      "outputs": [
-        {
-          "internalType": "string",
-          "name": "",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "grossNetworkProduct",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "isOwner",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "name": "locks",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "deployed",
-          "type": "bool"
-        },
-        {
-          "internalType": "uint256",
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-  "compiler": {
-    "name": "solc",
-    "version": "0.5.14+commit.01f1aaa4.Emscripten.clang"
-  },
-  "schemaVersion": "3.0.20",
-  "updatedAt": "2020-01-15T23:36:50.902Z"
-}
diff --git a/packages/contracts/src/abis/Unlock/UnlockV7.json b/packages/contracts/src/abis/Unlock/UnlockV7.json
deleted file mode 100644
index 58c025f4f0b..00000000000
--- a/packages/contracts/src/abis/Unlock/UnlockV7.json
+++ /dev/null
@@ -1,529 +0,0 @@
-{
-  "contractName": "Unlock",
-  "abi": [
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "string",
-          "name": "globalTokenSymbol",
-          "type": "string"
-        },
-        {
-          "indexed": false,
-          "internalType": "string",
-          "name": "globalTokenURI",
-          "type": "string"
-        }
-      ],
-      "name": "ConfigUnlock",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "lockOwner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "newLockAddress",
-          "type": "address"
-        }
-      ],
-      "name": "NewLock",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "previousOwner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "newOwner",
-          "type": "address"
-        }
-      ],
-      "name": "OwnershipTransferred",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "grossNetworkProduct",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "totalDiscountGranted",
-          "type": "uint256"
-        }
-      ],
-      "name": "ResetTrackedValue",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "address",
-          "name": "publicLockAddress",
-          "type": "address"
-        }
-      ],
-      "name": "SetLockTemplate",
-      "type": "event"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "globalBaseTokenURI",
-      "outputs": [
-        {
-          "internalType": "string",
-          "name": "",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "globalTokenSymbol",
-      "outputs": [
-        {
-          "internalType": "string",
-          "name": "",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "grossNetworkProduct",
-      "outputs": [
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-          "type": "uint256"
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-    {
-      "constant": true,
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-      "name": "isOwner",
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-        {
-          "internalType": "address",
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-      "name": "locks",
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-          "name": "deployed",
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-        },
-        {
-          "internalType": "uint256",
-          "name": "totalSales",
-          "type": "uint256"
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-          "name": "yieldedDiscountTokens",
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-          "type": "address"
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-    {
-      "constant": true,
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-          "name": "",
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-          "type": "uint256"
-        }
-      ],
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-      "stateMutability": "view",
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-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "newOwner",
-          "type": "address"
-        }
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-      "type": "function"
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-      "constant": true,
-      "inputs": [
-        {
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-      "name": "uniswapExchanges",
-      "outputs": [
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-          "internalType": "contract IUniswapExchange",
-          "name": "",
-          "type": "address"
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-          "type": "uint256"
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-          "type": "uint256"
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-          "name": "_maxNumberOfKeys",
-          "type": "uint256"
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-        {
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-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
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-      "name": "computeAvailableDiscountFor",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "discount",
-          "type": "uint256"
-        },
-        {
-          "internalType": "uint256",
-          "name": "tokens",
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-        {
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-      "name": "recordKeyPurchase",
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-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
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-          "name": "_discount",
-          "type": "uint256"
-        },
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
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-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "unlockVersion",
-      "outputs": [
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-          "internalType": "uint16",
-          "name": "",
-          "type": "uint16"
-        }
-      ],
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-      "stateMutability": "pure",
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-    {
-      "constant": false,
-      "inputs": [
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-          "internalType": "string",
-          "name": "_symbol",
-          "type": "string"
-        },
-        {
-          "internalType": "string",
-          "name": "_URI",
-          "type": "string"
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-      "name": "configUnlock",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
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-          "internalType": "address payable",
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-          "type": "address"
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-      "name": "setLockTemplate",
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-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_tokenAddress",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_exchangeAddress",
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-      "name": "setExchange",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
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-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "_grossNetworkProduct",
-          "type": "uint256"
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-        {
-          "internalType": "uint256",
-          "name": "_totalDiscountGranted",
-          "type": "uint256"
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-      "name": "resetTrackedValue",
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-      "type": "function"
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-      "constant": true,
-      "inputs": [],
-      "name": "getGlobalBaseTokenURI",
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-          "name": "",
-          "type": "string"
-        }
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-      "stateMutability": "view",
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-      "constant": true,
-      "inputs": [],
-      "name": "getGlobalTokenSymbol",
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-          "name": "",
-          "type": "string"
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-      "stateMutability": "view",
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-  "compiler": {
-    "name": "solc",
-    "version": "0.5.17+commit.d19bba13.Emscripten.clang"
-  },
-  "schemaVersion": "3.0.23",
-  "updatedAt": "2020-03-26T17:11:58.391Z"
-}
diff --git a/packages/contracts/src/abis/Unlock/UnlockV8.json b/packages/contracts/src/abis/Unlock/UnlockV8.json
deleted file mode 100644
index d0d69421021..00000000000
--- a/packages/contracts/src/abis/Unlock/UnlockV8.json
+++ /dev/null
@@ -1,607 +0,0 @@
-{
-  "contractName": "Unlock",
-  "abi": [
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "address",
-          "name": "udt",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "address",
-          "name": "weth",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "estimatedGasForPurchase",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "internalType": "string",
-          "name": "globalTokenSymbol",
-          "type": "string"
-        },
-        {
-          "indexed": false,
-          "internalType": "string",
-          "name": "globalTokenURI",
-          "type": "string"
-        }
-      ],
-      "name": "ConfigUnlock",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "lockOwner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "newLockAddress",
-          "type": "address"
-        }
-      ],
-      "name": "NewLock",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "previousOwner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "newOwner",
-          "type": "address"
-        }
-      ],
-      "name": "OwnershipTransferred",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "grossNetworkProduct",
-          "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "totalDiscountGranted",
-          "type": "uint256"
-        }
-      ],
-      "name": "ResetTrackedValue",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "address",
-          "name": "publicLockAddress",
-          "type": "address"
-        }
-      ],
-      "name": "SetLockTemplate",
-      "type": "event"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "estimatedGasForPurchase",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "globalBaseTokenURI",
-      "outputs": [
-        {
-          "internalType": "string",
-          "name": "",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "globalTokenSymbol",
-      "outputs": [
-        {
-          "internalType": "string",
-          "name": "",
-          "type": "string"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "grossNetworkProduct",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "isOwner",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "name": "locks",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "deployed",
-          "type": "bool"
-        },
-        {
-          "internalType": "uint256",
-          "name": "totalSales",
-          "type": "uint256"
-        },
-        {
-          "internalType": "uint256",
-          "name": "yieldedDiscountTokens",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "owner",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "publicLockAddress",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [],
-      "name": "renounceOwnership",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "totalDiscountGranted",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "newOwner",
-          "type": "address"
-        }
-      ],
-      "name": "transferOwnership",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "udt",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "name": "uniswapOracles",
-      "outputs": [
-        {
-          "internalType": "contract IUniswapOracle",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "weth",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_unlockOwner",
-          "type": "address"
-        }
-      ],
-      "name": "initialize",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
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-          "name": "discount",
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-        },
-        {
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-    {
-      "constant": true,
-      "inputs": [],
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-          "type": "address"
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-          "name": "_estimatedGasForPurchase",
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-        {
-          "internalType": "string",
-          "name": "_URI",
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-      "name": "configUnlock",
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-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
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-      "name": "setLockTemplate",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
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-    {
-      "constant": false,
-      "inputs": [
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-        {
-          "internalType": "address",
-          "name": "_oracleAddress",
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-      "name": "setOracle",
-      "outputs": [],
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-      "stateMutability": "nonpayable",
-      "type": "function"
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-    {
-      "constant": false,
-      "inputs": [
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-          "internalType": "uint256",
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-          "type": "uint256"
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-        {
-          "internalType": "uint256",
-          "name": "_totalDiscountGranted",
-          "type": "uint256"
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-      "name": "resetTrackedValue",
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-      "type": "function"
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-    {
-      "constant": true,
-      "inputs": [],
-      "name": "getGlobalBaseTokenURI",
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-          "name": "",
-          "type": "string"
-        }
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-      "stateMutability": "view",
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-      "inputs": [],
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-      "outputs": [
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-          "type": "string"
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-  "compiler": {
-    "name": "solc",
-    "version": "0.5.17+commit.d19bba13.Emscripten.clang"
-  },
-  "schemaVersion": "3.2.0",
-  "updatedAt": "2020-07-11T18:54:37.084Z"
-}
diff --git a/packages/contracts/src/contracts/PublicLock/IPublicLockV4.sol b/packages/contracts/src/contracts/PublicLock/IPublicLockV4.sol
deleted file mode 100644
index 274d399d9ac..00000000000
--- a/packages/contracts/src/contracts/PublicLock/IPublicLockV4.sol
+++ /dev/null
@@ -1,490 +0,0 @@
-pragma solidity ^0.5.0;
-
-/**
- * @title The PublicLock Interface
- */
-
-interface IPublicLockV4 {
-  ///===================================================================
-  /// Events
-  event Destroy(uint balance, address indexed owner);
-
-  event Disable();
-
-  event Withdrawal(
-    address indexed sender,
-    address indexed beneficiary,
-    uint amount
-  );
-
-  event CancelKey(
-    uint indexed tokenId,
-    address indexed owner,
-    address indexed sendTo,
-    uint refund
-  );
-
-  event RefundPenaltyChanged(
-    uint _refundPenaltyNumerator,
-    uint _refundPenaltyDenominator
-  );
-
-  event PriceChanged(uint oldKeyPrice, uint keyPrice);
-
-  event ExpireKey(uint indexed tokenId);
-
-  event NewLockSymbol(string symbol);
-
-  event TransferFeeChanged(
-    uint _transferFeeNumerator,
-    uint _transferFeeDenominator
-  );
-
-  /// @dev This emits when ownership of any NFT changes by any mechanism.
-  ///  This event emits when NFTs are created (`from` == 0) and destroyed
-  ///  (`to` == 0). Exception: during contract creation, any number of NFTs
-  ///  may be created and assigned without emitting Transfer. At the time of
-  ///  any transfer, the approved address for that NFT (if any) is reset to none.
-  event Transfer(
-    address indexed _from,
-    address indexed _to,
-    uint indexed _tokenId
-  );
-
-  /// @dev This emits when the approved address for an NFT is changed or
-  ///  reaffirmed. The zero address indicates there is no approved address.
-  ///  When a Transfer event emits, this also indicates that the approved
-  ///  address for that NFT (if any) is reset to none.
-  event Approval(
-    address indexed _owner,
-    address indexed _approved,
-    uint indexed _tokenId
-  );
-
-  /// @dev This emits when an operator is enabled or disabled for an owner.
-  ///  The operator can manage all NFTs of the owner.
-  event ApprovalForAll(
-    address indexed _owner,
-    address indexed _operator,
-    bool _approved
-  );
-
-  ///===================================================================
-
-  /// Functions
-
-  /**
-   * @notice The version number of the current implementation on this network.
-   * @return The current version number.
-   */
-  function publicLockVersion() external pure returns (uint16);
-
-  /**
-   * @notice Used to disable lock before migrating keys and/or destroying contract.
-   * @dev Throws if called by other than the owner.
-   * @dev Throws if lock contract has already been disabled.
-   */
-  function disableLock() external;
-
-  /**
-   * @notice Used to clean up old lock contracts from the blockchain.
-   * TODO: add a check to ensure all keys are INVALID!
-   * @dev Throws if called by other than owner.
-   * @dev Throws if lock has not yet been disabled.
-   */
-  function destroyLock() external;
-
-  /**
-   * @dev Called by owner to withdraw all funds from the lock and send them to the `beneficiary`.
-   * @dev Throws if called by other than the owner or beneficiary
-   * @param _amount specifies the max amount to withdraw, which may be reduced when
-   * considering the available balance. Set to 0 or MAX_UINT to withdraw everything.
-   *  -- however be wary of draining funds as it breaks the `cancelAndRefund`
-   * use case.
-   */
-  function withdraw(uint _amount) external;
-
-  /**
-   * A function which lets the owner of the lock to change the price for future purchases.
-   * @dev Throws if called by other than owner
-   * @dev Throws if lock has been disabled
-   * @param _keyPrice The new price to set for keys
-   */
-  function updateKeyPrice(uint _keyPrice) external;
-
-  /**
-   * A function which lets the owner of the lock update the beneficiary account,
-   * which receives funds on withdrawal.
-   * @dev Throws if called by other than owner of beneficiary
-   * @dev Throws if _beneficiary is address(0)
-   * @param _beneficiary The new address to set as the beneficiary
-   */
-  function updateBeneficiary(address _beneficiary) external;
-
-  /**
-   * A function which lets the owner of the lock expire a users' key.
-   * @dev Throws if called by other than lock owner
-   * @dev Throws if key owner does not have a valid key
-   * @param _owner The address of the key owner
-   */
-  function expireKeyFor(address _owner) external;
-
-  /**
-   * Checks if the user has a non-expired key.
-   * @param _owner The address of the key owner
-   */
-  function getHasValidKey(address _owner) external view returns (bool);
-
-  /**
-   * @notice Find the tokenId for a given user
-   * @return The tokenId of the NFT, else revert
-   * @dev Throws if key owner does not have a valid key
-   * @param _account The address of the key owner
-   */
-  function getTokenIdFor(address _account) external view returns (uint);
-
-  /**
-   * A function which returns a subset of the keys for this Lock as an array
-   * @param _page the page of key owners requested when faceted by page size
-   * @param _pageSize the number of Key Owners requested per page
-   * @dev Throws if there are no key owners yet
-   */
-  function getOwnersByPage(
-    uint _page,
-    uint _pageSize
-  ) external view returns (address[] memory);
-
-  /**
-   * Checks if the given address owns the given tokenId.
-   * @param _tokenId The tokenId of the key to check
-   * @param _owner The potential key owners address
-   */
-  function isKeyOwner(
-    uint _tokenId,
-    address _owner
-  ) external view returns (bool);
-
-  /**
-   * @dev Returns the key's ExpirationTimestamp field for a given owner.
-   * @param _owner address of the user for whom we search the key
-   * @dev Throws if owner has never owned a key for this lock
-   */
-  function keyExpirationTimestampFor(
-    address _owner
-  ) external view returns (uint timestamp);
-
-  /**
-   * Public function which returns the total number of unique owners (both expired
-   * and valid).  This may be larger than totalSupply.
-   */
-  function numberOfOwners() external view returns (uint);
-
-  /**
-   * Allows the Lock owner to assign a descriptive name for this Lock.
-   * @param _lockName The new name for the lock
-   * @dev Throws if called by other than the lock owner
-   */
-  function updateLockName(string calldata _lockName) external;
-
-  /**
-   * Allows the Lock owner to assign a Symbol for this Lock.
-   * @param _lockSymbol The new Symbol for the lock
-   * @dev Throws if called by other than the lock owner
-   */
-  function updateLockSymbol(string calldata _lockSymbol) external;
-
-  /**
-   * @dev Gets the token symbol
-   * @return string representing the token symbol
-   */
-  function symbol() external view returns (string memory);
-
-  /**
-   * Allows the Lock owner to update the baseTokenURI for this Lock.
-   * @dev Throws if called by other than the lock owner
-   * @param _baseTokenURI String representing the base of the URI for this lock.
-   */
-  function setBaseTokenURI(string calldata _baseTokenURI) external;
-
-  /**  @notice A distinct Uniform Resource Identifier (URI) for a given asset.
-   * @dev Throws if `_tokenId` is not a valid NFT. URIs are defined in RFC
-   *  3986. The URI may point to a JSON file that conforms to the "ERC721
-   *  Metadata JSON Schema".
-   * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
-   * @param _tokenId The tokenID we're inquiring about
-   * @return String representing the URI for the requested token
-   */
-  function tokenURI(uint256 _tokenId) external view returns (string memory);
-
-  /**
-   * Allows the Lock owner to give a collection of users a key with no charge.
-   * Each key may be assigned a different expiration date.
-   * @dev Throws if called by other than the lock-owner
-   * @param _recipients An array of receiving addresses
-   * @param _expirationTimestamps An array of expiration Timestamps for the keys being granted
-   */
-  function grantKeys(
-    address[] calldata _recipients,
-    uint[] calldata _expirationTimestamps
-  ) external;
-
-  /**
-   * @dev Key Purchase function
-   * @param _recipient address of the recipient of the purchased key
-   * @dev Throws if lock is disabled.
-   */
-  function purchaseFor(address _recipient) external payable;
-
-  /**
-   * @dev Purchase function, public version, with referrer.
-   * @param _recipient address of the recipient of the purchased key
-   * @param _referrer address of the user making the referral
-   * @dev Throws if lock is disabled, or if referrer doesn't have a valid key.
-   */
-  function purchaseForFrom(
-    address _recipient,
-    address _referrer
-  ) external payable;
-
-  /**
-   * Allow the Lock owner to change the transfer fee.
-   * @dev Throws if called by other than lock-owner
-   * Ex: 200 bps = 2%
-   */
-  function updateTransferFee(
-    uint _transferFeeNumerator,
-    uint _transferFeeDenominator
-  ) external;
-
-  /**
-   * Determines how much of a fee a key owner would need to pay in order to
-   * transfer the key to another account.  This is pro-rated so the fee goes down
-   * overtime.
-   * @dev Throws if _owner does not have a valid key
-   * @param _owner The owner of the key check the transfer fee for.
-   * @return The transfer fee in basis-points(bps).
-   */
-  function getTransferFee(address _owner) external view returns (uint);
-
-  /**
-   * @notice Destroys the msg.sender's key and sends a refund based on the amount of time remaining.
-   */
-  function cancelAndRefund() external;
-
-  /**
-   * @dev Cancels a key owned by a different user and sends the funds to the msg.sender.
-   * @param _keyOwner this user's key will be canceled
-   * @param _signature getCancelAndRefundApprovalHash signed by the _keyOwner
-   */
-  function cancelAndRefundFor(
-    address _keyOwner,
-    bytes calldata _signature
-  ) external;
-
-  /**
-   * Allow the owner to change the refund penalty.
-   * @dev Throws if called by other than owner
-   */
-  function updateRefundPenalty(
-    uint _refundPenaltyNumerator,
-    uint _refundPenaltyDenominator
-  ) external;
-
-  /**
-   * @dev Determines how much of a refund a key owner would receive if they issued
-   * @param _owner The key owner to get the refund value for.
-   * a cancelAndRefund block.timestamp.
-   * Note that due to the time required to mine a tx, the actual refund amount will be lower
-   * than what the user reads from this call.
-   */
-  function getCancelAndRefundValueFor(
-    address _owner
-  ) external view returns (uint refund);
-
-  function keyOwnerToNonce(address) external view returns (uint256);
-
-  /**
-   * @dev returns the hash to sign in order to allow another user to cancel on your behalf.
-   * @param _keyOwner The key owner's address
-   * @param _txSender The address cancelling the key on behalf of the key-owner
-   * @return approvalHash The returned hash
-   */
-  function getCancelAndRefundApprovalHash(
-    address _keyOwner,
-    address _txSender
-  ) external view returns (bytes32 approvalHash);
-
-  /**
-   *@notice A utility function for erc721 metadata
-   * @param _a String 1
-   * @param _b String 2
-   * @param _c String 3
-   * @param _d String 4
-   * @return _concatenatedString The returned string
-   */
-  function strConcat(
-    string calldata _a,
-    string calldata _b,
-    string calldata _c,
-    string calldata _d
-  ) external pure returns (string memory _concatenatedString);
-
-  /**
-   * @notice A utility function for erc721 metadata
-   * @param _i A uint to convert
-   * @return _uintAsString the returned string
-   */
-  function uint2Str(
-    uint256 _i
-  ) external pure returns (string memory _uintAsString);
-
-  /**
-   * @notice A utility function for erc721 metadata
-   * @param _addr An address to convert
-   * @return A string
-   */
-  function address2Str(address _addr) external pure returns (string memory);
-
-  ///===================================================================
-  /// Auto-generated getter functions from public state variables
-
-  function beneficiary() external view returns (address);
-
-  function expirationDuration() external view returns (uint256);
-
-  function isAlive() external view returns (bool);
-
-  function keyPrice() external view returns (uint256);
-
-  function maxNumberOfKeys() external view returns (uint256);
-
-  function owners(uint256) external view returns (address);
-
-  function unlockProtocol() external view returns (address);
-
-  ///===================================================================
-
-  /// From Openzeppelin's IERC721.sol
-
-  /// @notice Transfer ownership of an NFT -- THE CALLER IS RESPONSIBLE
-  ///  TO CONFIRM THAT `_to` IS CAPABLE OF RECEIVING NFTS OR ELSE
-  ///  THEY MAY BE PERMANENTLY LOST
-  /// @dev Throws unless `msg.sender` is the current owner, an authorized
-  ///  operator, or the approved address for this NFT. Throws if `_from` is
-  ///  not the current owner. Throws if `_to` is the zero address. Throws if
-  ///  `_tokenId` is not a valid NFT.
-  /// @param _from The current owner of the NFT
-  /// @param _to The new owner
-  /// @param _tokenId The NFT to transfer
-  function transferFrom(
-    address _from,
-    address _to,
-    uint _tokenId
-  ) external payable;
-
-  /// @notice Set or reaffirm the approved address for an NFT
-  /// @dev The zero address indicates there is no approved address.
-  /// @dev Throws unless `msg.sender` is the current NFT owner, or an authorized
-  ///  operator of the current owner.
-  /// @param _approved The new approved NFT controller
-  /// @param _tokenId The NFT to approve
-  function approve(address _approved, uint _tokenId) external payable;
-
-  /// @notice Transfers the ownership of an NFT from one address to another address
-  /// @dev Throws unless `msg.sender` is the current owner, an authorized
-  ///  operator, or the approved address for this NFT. Throws if `_from` is
-  ///  not the current owner. Throws if `_to` is the zero address. Throws if
-  ///  `_tokenId` is not a valid NFT. When transfer is complete, this function
-  ///  checks if `_to` is a smart contract (code size > 0). If so, it calls
-  ///  `onERC721Received` on `_to` and throws if the return value is not
-  ///  `bytes4(keccak256('onERC721Received(address,address,uint,bytes)'))`.
-  /// @param _from The current owner of the NFT
-  /// @param _to The new owner
-  /// @param _tokenId The NFT to transfer
-  /// @param data Additional data with no specified format, sent in call to `_to`
-  function safeTransferFrom(
-    address _from,
-    address _to,
-    uint _tokenId,
-    bytes calldata data
-  ) external payable;
-
-  /// @notice Transfers the ownership of an NFT from one address to another address
-  /// @dev This works identically to the other function with an extra data parameter,
-  ///  except this function just sets data to ''
-  /// @param _from The current owner of the NFT
-  /// @param _to The new owner
-  /// @param _tokenId The NFT to transfer
-  function safeTransferFrom(
-    address _from,
-    address _to,
-    uint _tokenId
-  ) external payable;
-
-  /**
-   * @dev Sets or unsets the approval of a given operator
-   * An operator is allowed to transfer all tokens of the sender on their behalf
-   * @dev Throws if lock is disabled, or if _to == msg.sender.
-   * @param _to operator address to set the approval
-   * @param _approved representing the status of the approval to be set
-   */
-  function setApprovalForAll(address _to, bool _approved) external;
-
-  /**
-   * In the specific case of a Lock, each owner can own only at most 1 key.
-   * @return The number of NFTs owned by `_owner`, either 0 or 1.
-   * @dev Throws if _owner = address(0)
-   * @param _owner The address of the key owner
-   */
-  function balanceOf(address _owner) external view returns (uint);
-
-  /// @notice Find the owner of an NFT
-  /// @dev NFTs assigned to zero address are considered invalid, and queries
-  ///  about them do throw.
-  /// @param _tokenId The identifier for an NFT
-  /// @return The address of the owner of the NFT
-  function ownerOf(uint _tokenId) external view returns (address);
-
-  /**
-   * Will return the approved recipient for a key, if any.
-   * @param _tokenId The ID of the token we're inquiring about.
-   * @return address The approved address (if any)
-   */
-  function getApproved(uint _tokenId) external view returns (address);
-
-  /**
-   * @dev Tells whether an operator is approved by a given owner
-   * @param _owner owner address which you want to query the approval of
-   * @param _operator operator address which you want to query the approval of
-   * @return bool whether the given operator is approved by the given owner
-   */
-  function isApprovedForAll(
-    address _owner,
-    address _operator
-  ) external view returns (bool);
-
-  /// @notice A descriptive name for a collection of NFTs in this contract
-  function name() external view returns (string memory _name);
-
-  ///===================================================================
-
-  /// From IERC721Enumerable
-  function totalSupply() external view returns (uint256);
-
-  ///===================================================================
-
-  /// From Openzeppelin's Ownable.sol
-  function owner() external view returns (address);
-
-  function isOwner() external view returns (bool);
-
-  function renounceOwnership() external;
-
-  function transferOwnership(address newOwner) external;
-
-  ///===================================================================
-
-  /// From ERC165.sol
-  function supportsInterface(bytes4 interfaceId) external view returns (bool);
-  ///===================================================================
-}
diff --git a/packages/contracts/src/contracts/PublicLock/IPublicLockV5.sol b/packages/contracts/src/contracts/PublicLock/IPublicLockV5.sol
deleted file mode 100644
index 602baf78171..00000000000
--- a/packages/contracts/src/contracts/PublicLock/IPublicLockV5.sol
+++ /dev/null
@@ -1,579 +0,0 @@
-pragma solidity ^0.5.0;
-
-/**
- * @title Initializable
- *
- * @dev Helper contract to support initializer functions. To use it, replace
- * the constructor with a function that has the `initializer` modifier.
- * WARNING: Unlike constructors, initializer functions must be manually
- * invoked. This applies both to deploying an Initializable contract, as well
- * as extending an Initializable contract via inheritance.
- * WARNING: When used with inheritance, manual care must be taken to not invoke
- * a parent initializer twice, or ensure that all initializers are idempotent,
- * because this is not dealt with automatically as with constructors.
- */
-contract Initializable {
-  /**
-   * @dev Indicates that the contract has been initialized.
-   */
-  bool private initialized;
-
-  /**
-   * @dev Indicates that the contract is in the process of being initialized.
-   */
-  bool private initializing;
-
-  /**
-   * @dev Modifier to use in the initializer function of a contract.
-   */
-  modifier initializer() {
-    require(
-      initializing || isConstructor() || !initialized,
-      "Contract instance has already been initialized"
-    );
-
-    bool isTopLevelCall = !initializing;
-    if (isTopLevelCall) {
-      initializing = true;
-      initialized = true;
-    }
-
-    _;
-
-    if (isTopLevelCall) {
-      initializing = false;
-    }
-  }
-
-  /// @dev Returns true if and only if the function is running in the constructor
-  function isConstructor() private view returns (bool) {
-    // extcodesize checks the size of the code stored in an address, and
-    // address returns the current address. Since the code is still not
-    // deployed when running a constructor, any checks on its code size will
-    // yield zero, making it an effective way to detect if a contract is
-    // under construction or not.
-    address self = address(this);
-    uint256 cs;
-    assembly {
-      cs := extcodesize(self)
-    }
-    return cs == 0;
-  }
-
-  // Reserved storage space to allow for layout changes in the future.
-  uint256[50] private ______gap;
-}
-
-/**
- * @dev Interface of the ERC165 standard, as defined in the
- * https://eips.ethereum.org/EIPS/eip-165[EIP].
- *
- * Implementers can declare support of contract interfaces, which can then be
- * queried by others ({ERC165Checker}).
- *
- * For an implementation, see {ERC165}.
- */
-interface IERC165 {
-  /**
-   * @dev Returns true if this contract implements the interface defined by
-   * `interfaceId`. See the corresponding
-   * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
-   * to learn more about how these ids are created.
-   *
-   * This function call must use less than 30 000 gas.
-   */
-  function supportsInterface(bytes4 interfaceId) external view returns (bool);
-}
-
-/**
- * @dev Required interface of an ERC721 compliant contract.
- */
-contract IERC721 is Initializable, IERC165 {
-  event Transfer(
-    address indexed from,
-    address indexed to,
-    uint256 indexed tokenId
-  );
-  event Approval(
-    address indexed owner,
-    address indexed approved,
-    uint256 indexed tokenId
-  );
-  event ApprovalForAll(
-    address indexed owner,
-    address indexed operator,
-    bool approved
-  );
-
-  /**
-   * @dev Returns the number of NFTs in `owner`'s account.
-   */
-  function balanceOf(address owner) public view returns (uint256 balance);
-
-  /**
-   * @dev Returns the owner of the NFT specified by `tokenId`.
-   */
-  function ownerOf(uint256 tokenId) public view returns (address owner);
-
-  /**
-   * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
-   * another (`to`).
-   *
-   *
-   *
-   * Requirements:
-   * - `from`, `to` cannot be zero.
-   * - `tokenId` must be owned by `from`.
-   * - If the caller is not `from`, it must be have been allowed to move this
-   * NFT by either `approve` or `setApprovalForAll`.
-   */
-  function safeTransferFrom(address from, address to, uint256 tokenId) public;
-
-  /**
-   * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
-   * another (`to`).
-   *
-   * Requirements:
-   * - If the caller is not `from`, it must be approved to move this NFT by
-   * either `approve` or `setApprovalForAll`.
-   */
-  function transferFrom(address from, address to, uint256 tokenId) public;
-
-  function approve(address to, uint256 tokenId) public;
-
-  function getApproved(uint256 tokenId) public view returns (address operator);
-
-  function setApprovalForAll(address operator, bool _approved) public;
-
-  function isApprovedForAll(
-    address owner,
-    address operator
-  ) public view returns (bool);
-
-  function safeTransferFrom(
-    address from,
-    address to,
-    uint256 tokenId,
-    bytes memory data
-  ) public;
-}
-
-// import '@openzeppelin/contracts-ethereum-package/contracts/token/ERC721/IERC721Enumerable.sol';
-/**
- * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
- * @dev See https://eips.ethereum.org/EIPS/eip-721
- */
-contract IERC721Enumerable is Initializable, IERC721 {
-  function totalSupply() public view returns (uint256);
-
-  function tokenOfOwnerByIndex(
-    address owner,
-    uint256 index
-  ) public view returns (uint256 tokenId);
-
-  function tokenByIndex(uint256 index) public view returns (uint256);
-}
-
-/**
- * @title The PublicLock Interface
- */
-
-contract IPublicLockV5 is IERC721Enumerable {
-  // See indentationissue description here:
-  // https://github.com/duaraghav8/Ethlint/issues/268
-  // solium-disable indentation
-
-  ///===================================================================
-  /// Events
-  event Destroy(uint balance, address indexed owner);
-
-  event Disable();
-
-  event Withdrawal(
-    address indexed sender,
-    address indexed tokenAddress,
-    address indexed beneficiary,
-    uint amount
-  );
-
-  event CancelKey(
-    uint indexed tokenId,
-    address indexed owner,
-    address indexed sendTo,
-    uint refund
-  );
-
-  event RefundPenaltyChanged(
-    uint freeTrialLength,
-    uint refundPenaltyBasisPoints
-  );
-
-  event PriceChanged(uint oldKeyPrice, uint keyPrice);
-
-  event ExpireKey(uint indexed tokenId);
-
-  event NewLockSymbol(string symbol);
-
-  event TransferFeeChanged(uint transferFeeBasisPoints);
-
-  /// @notice emits anytime the nonce used for off-chain approvals changes.
-  event NonceChanged(address indexed keyOwner, uint nextAvailableNonce);
-
-  ///===================================================================
-
-  /// Functions
-
-  function initialize(
-    address _owner,
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys,
-    string calldata _lockName
-  ) external;
-
-  /**
-   * @notice The version number of the current implementation on this network.
-   * @return The current version number.
-   */
-  function publicLockVersion() public pure returns (uint);
-
-  /**
-   * @notice Gets the current balance of the account provided.
-   * @param _tokenAddress The token type to retrieve the balance of.
-   * @param _account The account to get the balance of.
-   * @return The number of tokens of the given type for the given address, possibly 0.
-   */
-  function getBalance(
-    address _tokenAddress,
-    address _account
-  ) external view returns (uint);
-
-  /**
-   * @notice Used to disable lock before migrating keys and/or destroying contract.
-   * @dev Throws if called by other than the owner.
-   * @dev Throws if lock contract has already been disabled.
-   */
-  function disableLock() external;
-
-  /**
-   * @notice Used to clean up old lock contracts from the blockchain.
-   * TODO: add a check to ensure all keys are INVALID!
-   * @dev Throws if called by other than owner.
-   * @dev Throws if lock has not yet been disabled.
-   */
-  function destroyLock() external;
-
-  /**
-   * @dev Called by owner to withdraw all funds from the lock and send them to the `beneficiary`.
-   * @dev Throws if called by other than the owner or beneficiary
-   * @param _tokenAddress specifies the token address to withdraw or 0 for ETH. This is usually
-   * the same as `tokenAddress` in MixinFunds.
-   * @param _amount specifies the max amount to withdraw, which may be reduced when
-   * considering the available balance. Set to 0 or MAX_UINT to withdraw everything.
-   *  -- however be wary of draining funds as it breaks the `cancelAndRefund` and `fullRefund`
-   * use cases.
-   */
-  function withdraw(address _tokenAddress, uint _amount) external;
-
-  /**
-   * A function which lets the owner of the lock to change the price for future purchases.
-   * @dev Throws if called by other than owner
-   * @dev Throws if lock has been disabled
-   * @param _keyPrice The new price to set for keys
-   */
-  function updateKeyPrice(uint _keyPrice) external;
-
-  /**
-   * A function which lets the owner of the lock update the beneficiary account,
-   * which receives funds on withdrawal.
-   * @dev Throws if called by other than owner of beneficiary
-   * @dev Throws if _beneficiary is address(0)
-   * @param _beneficiary The new address to set as the beneficiary
-   */
-  function updateBeneficiary(address _beneficiary) external;
-
-  /**
-   * A function which lets the owner of the lock expire a users' key.
-   * @dev Throws if called by other than lock owner
-   * @dev Throws if key owner does not have a valid key
-   * @param _owner The address of the key owner
-   */
-  function expireKeyFor(address _owner) external;
-
-  /**
-   * Checks if the user has a non-expired key.
-   * @param _owner The address of the key owner
-   */
-  function getHasValidKey(address _owner) external view returns (bool);
-
-  /**
-   * @notice Find the tokenId for a given user
-   * @return The tokenId of the NFT, else revert
-   * @dev Throws if key owner does not have a valid key
-   * @param _account The address of the key owner
-   */
-  function getTokenIdFor(address _account) external view returns (uint);
-
-  /**
-   * A function which returns a subset of the keys for this Lock as an array
-   * @param _page the page of key owners requested when faceted by page size
-   * @param _pageSize the number of Key Owners requested per page
-   * @dev Throws if there are no key owners yet
-   */
-  function getOwnersByPage(
-    uint _page,
-    uint _pageSize
-  ) external view returns (address[] memory);
-
-  /**
-   * Checks if the given address owns the given tokenId.
-   * @param _tokenId The tokenId of the key to check
-   * @param _owner The potential key owners address
-   */
-  function isKeyOwner(
-    uint _tokenId,
-    address _owner
-  ) external view returns (bool);
-
-  /**
-   * @dev Returns the key's ExpirationTimestamp field for a given owner.
-   * @param _owner address of the user for whom we search the key
-   * @dev Throws if owner has never owned a key for this lock
-   */
-  function keyExpirationTimestampFor(
-    address _owner
-  ) external view returns (uint timestamp);
-
-  /**
-   * Public function which returns the total number of unique owners (both expired
-   * and valid).  This may be larger than totalSupply.
-   */
-  function numberOfOwners() external view returns (uint);
-
-  /**
-   * Allows the Lock owner to assign a descriptive name for this Lock.
-   * @param _lockName The new name for the lock
-   * @dev Throws if called by other than the lock owner
-   */
-  function updateLockName(string calldata _lockName) external;
-
-  /**
-   * Allows the Lock owner to assign a Symbol for this Lock.
-   * @param _lockSymbol The new Symbol for the lock
-   * @dev Throws if called by other than the lock owner
-   */
-  function updateLockSymbol(string calldata _lockSymbol) external;
-
-  /**
-   * @dev Gets the token symbol
-   * @return string representing the token symbol
-   */
-  function symbol() external view returns (string memory);
-
-  /**
-   * Allows the Lock owner to update the baseTokenURI for this Lock.
-   * @dev Throws if called by other than the lock owner
-   * @param _baseTokenURI String representing the base of the URI for this lock.
-   */
-  function setBaseTokenURI(string calldata _baseTokenURI) external;
-
-  /**  @notice A distinct Uniform Resource Identifier (URI) for a given asset.
-   * @dev Throws if `_tokenId` is not a valid NFT. URIs are defined in RFC
-   *  3986. The URI may point to a JSON file that conforms to the "ERC721
-   *  Metadata JSON Schema".
-   * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
-   * @param _tokenId The tokenID we're inquiring about
-   * @return String representing the URI for the requested token
-   */
-  function tokenURI(uint256 _tokenId) external view returns (string memory);
-
-  /**
-   * Allows the Lock owner to give a collection of users a key with no charge.
-   * Each key may be assigned a different expiration date.
-   * @dev Throws if called by other than the lock-owner
-   * @param _recipients An array of receiving addresses
-   * @param _expirationTimestamps An array of expiration Timestamps for the keys being granted
-   */
-  function grantKeys(
-    address[] calldata _recipients,
-    uint[] calldata _expirationTimestamps
-  ) external;
-
-  /**
-   * @dev Purchase function
-   * @param _value the number of tokens to pay for this purchase >= the current keyPrice - any applicable discount
-   * (_value is ignored when using ETH)
-   * @param _recipient address of the recipient of the purchased key
-   * @param _referrer address of the user making the referral
-   * @param _data arbitrary data populated by the front-end which initiated the sale
-   * @dev Throws if lock is disabled. Throws if lock is sold-out. Throws if _recipient == address(0).
-   * @dev Setting _value to keyPrice exactly doubles as a security feature. That way if the lock owner increases the
-   * price while my transaction is pending I can't be charged more than I expected (only applicable to ERC-20 when more
-   * than keyPrice is approved for spending).
-   */
-  function purchase(
-    uint256 _value,
-    address _recipient,
-    address _referrer,
-    bytes calldata _data
-  ) external payable;
-
-  /**
-   * Allow the Lock owner to change the transfer fee.
-   * @dev Throws if called by other than lock-owner
-   * @param _transferFeeBasisPoints The new transfer fee in basis-points(bps).
-   * Ex: 200 bps = 2%
-   */
-  function updateTransferFee(uint _transferFeeBasisPoints) external;
-
-  /**
-   * Determines how much of a fee a key owner would need to pay in order to
-   * transfer the key to another account.  This is pro-rated so the fee goes down
-   * overtime.
-   * @dev Throws if _owner does not have a valid key
-   * @param _owner The owner of the key check the transfer fee for.
-   * @param _time The amount of time to calculate the fee for.
-   * @return The transfer fee in seconds.
-   */
-  function getTransferFee(
-    address _owner,
-    uint _time
-  ) external view returns (uint);
-
-  /**
-   * @dev Invoked by the lock owner to destroy the user's key and perform a refund and cancellation of the key
-   * @param _keyOwner The key owner to whom we wish to send a refund to
-   * @param amount The amount to refund the key-owner
-   * @dev Throws if called by other than owner
-   * @dev Throws if _keyOwner does not have a valid key
-   */
-  function fullRefund(address _keyOwner, uint amount) external;
-
-  /**
-   * @notice Destroys the msg.sender's key and sends a refund based on the amount of time remaining.
-   */
-  function cancelAndRefund() external;
-
-  /**
-   * @dev Cancels a key owned by a different user and sends the funds to the msg.sender.
-   * @param _keyOwner this user's key will be canceled
-   * @param _signature getCancelAndRefundApprovalHash signed by the _keyOwner
-   */
-  function cancelAndRefundFor(
-    address _keyOwner,
-    bytes calldata _signature
-  ) external;
-
-  /**
-   * @notice Sets the minimum nonce for a valid off-chain approval message from the
-   * senders account.
-   * @dev This can be used to invalidate a previously signed message.
-   */
-  function invalidateOffchainApproval(uint _nextAvailableNonce) external;
-
-  /**
-   * Allow the owner to change the refund penalty.
-   * @dev Throws if called by other than owner
-   * @param _freeTrialLength The new duration of free trials for this lock
-   * @param _refundPenaltyBasisPoints The new refund penaly in basis-points(bps)
-   */
-  function updateRefundPenalty(
-    uint _freeTrialLength,
-    uint _refundPenaltyBasisPoints
-  ) external;
-
-  /**
-   * @dev Determines how much of a refund a key owner would receive if they issued
-   * @param _owner The key owner to get the refund value for.
-   * a cancelAndRefund block.timestamp.
-   * Note that due to the time required to mine a tx, the actual refund amount will be lower
-   * than what the user reads from this call.
-   */
-  function getCancelAndRefundValueFor(
-    address _owner
-  ) external view returns (uint refund);
-
-  function keyOwnerToNonce(address) external view returns (uint256);
-
-  /**
-   * @dev returns the hash to sign in order to allow another user to cancel on your behalf.
-   * @param _keyOwner The key owner's address
-   * @param _txSender The address cancelling the key on behalf of the key-owner
-   * @return approvalHash The returned hash
-   */
-  function getCancelAndRefundApprovalHash(
-    address _keyOwner,
-    address _txSender
-  ) external view returns (bytes32 approvalHash);
-
-  ///===================================================================
-  /// Auto-generated getter functions from public state variables
-
-  function beneficiary() external view returns (address);
-
-  function erc1820() external view returns (address);
-
-  function expirationDuration() external view returns (uint256);
-
-  function freeTrialLength() external view returns (uint256);
-
-  function isAlive() external view returns (bool);
-
-  function keyCancelInterfaceId() external view returns (bytes32);
-
-  function keySoldInterfaceId() external view returns (bytes32);
-
-  function keyPrice() external view returns (uint256);
-
-  function maxNumberOfKeys() external view returns (uint256);
-
-  function owners(uint256) external view returns (address);
-
-  function refundPenaltyBasisPoints() external view returns (uint256);
-
-  function tokenAddress() external view returns (address);
-
-  function transferFeeBasisPoints() external view returns (uint256);
-
-  function unlockProtocol() external view returns (address);
-
-  function BASIS_POINTS_DEN() external view returns (uint256);
-
-  ///===================================================================
-
-  /**
-   * @notice Allows the key owner to safely share their key (parent key) by
-   * transferring a portion of the remaining time to a new key (child key).
-   * @dev Throws if key is not valid.
-   * @dev Throws if `_to` is the zero address
-   * @param _to The recipient of the shared key
-   * @param _tokenId the key to share
-   * @param _timeShared The amount of time shared
-   * checks if `_to` is a smart contract (code size > 0). If so, it calls
-   * `onERC721Received` on `_to` and throws if the return value is not
-   * `bytes4(keccak256('onERC721Received(address,address,uint,bytes)'))`.
-   * @dev Emit Transfer event
-   */
-  function shareKey(address _to, uint _tokenId, uint _timeShared) external;
-
-  /// @notice A descriptive name for a collection of NFTs in this contract
-  function name() external view returns (string memory _name);
-
-  ///===================================================================
-
-  /// From Openzeppelin's Ownable.sol
-  function owner() external view returns (address);
-
-  function isOwner() external view returns (bool);
-
-  function renounceOwnership() external;
-
-  function transferOwnership(address newOwner) external;
-
-  ///===================================================================
-
-  /// From ERC165.sol
-  function supportsInterface(bytes4 interfaceId) external view returns (bool);
-  ///===================================================================
-}
diff --git a/packages/contracts/src/contracts/PublicLock/IPublicLockV6.sol b/packages/contracts/src/contracts/PublicLock/IPublicLockV6.sol
deleted file mode 100644
index 71f278c254e..00000000000
--- a/packages/contracts/src/contracts/PublicLock/IPublicLockV6.sol
+++ /dev/null
@@ -1,593 +0,0 @@
-pragma solidity ^0.5.0;
-
-/**
- * @title Initializable
- *
- * @dev Helper contract to support initializer functions. To use it, replace
- * the constructor with a function that has the `initializer` modifier.
- * WARNING: Unlike constructors, initializer functions must be manually
- * invoked. This applies both to deploying an Initializable contract, as well
- * as extending an Initializable contract via inheritance.
- * WARNING: When used with inheritance, manual care must be taken to not invoke
- * a parent initializer twice, or ensure that all initializers are idempotent,
- * because this is not dealt with automatically as with constructors.
- */
-contract Initializable {
-  /**
-   * @dev Indicates that the contract has been initialized.
-   */
-  bool private initialized;
-
-  /**
-   * @dev Indicates that the contract is in the process of being initialized.
-   */
-  bool private initializing;
-
-  /**
-   * @dev Modifier to use in the initializer function of a contract.
-   */
-  modifier initializer() {
-    require(
-      initializing || isConstructor() || !initialized,
-      "Contract instance has already been initialized"
-    );
-
-    bool isTopLevelCall = !initializing;
-    if (isTopLevelCall) {
-      initializing = true;
-      initialized = true;
-    }
-
-    _;
-
-    if (isTopLevelCall) {
-      initializing = false;
-    }
-  }
-
-  /// @dev Returns true if and only if the function is running in the constructor
-  function isConstructor() private view returns (bool) {
-    // extcodesize checks the size of the code stored in an address, and
-    // address returns the current address. Since the code is still not
-    // deployed when running a constructor, any checks on its code size will
-    // yield zero, making it an effective way to detect if a contract is
-    // under construction or not.
-    address self = address(this);
-    uint256 cs;
-    assembly {
-      cs := extcodesize(self)
-    }
-    return cs == 0;
-  }
-
-  // Reserved storage space to allow for layout changes in the future.
-  uint256[50] private ______gap;
-}
-
-/**
- * @dev Interface of the ERC165 standard, as defined in the
- * https://eips.ethereum.org/EIPS/eip-165[EIP].
- *
- * Implementers can declare support of contract interfaces, which can then be
- * queried by others ({ERC165Checker}).
- *
- * For an implementation, see {ERC165}.
- */
-interface IERC165 {
-  /**
-   * @dev Returns true if this contract implements the interface defined by
-   * `interfaceId`. See the corresponding
-   * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
-   * to learn more about how these ids are created.
-   *
-   * This function call must use less than 30 000 gas.
-   */
-  function supportsInterface(bytes4 interfaceId) external view returns (bool);
-}
-
-/**
- * @dev Required interface of an ERC721 compliant contract.
- */
-contract IERC721 is Initializable, IERC165 {
-  event Transfer(
-    address indexed from,
-    address indexed to,
-    uint256 indexed tokenId
-  );
-  event Approval(
-    address indexed owner,
-    address indexed approved,
-    uint256 indexed tokenId
-  );
-  event ApprovalForAll(
-    address indexed owner,
-    address indexed operator,
-    bool approved
-  );
-
-  /**
-   * @dev Returns the number of NFTs in `owner`'s account.
-   */
-  function balanceOf(address owner) public view returns (uint256 balance);
-
-  /**
-   * @dev Returns the owner of the NFT specified by `tokenId`.
-   */
-  function ownerOf(uint256 tokenId) public view returns (address owner);
-
-  /**
-   * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
-   * another (`to`).
-   *
-   *
-   *
-   * Requirements:
-   * - `from`, `to` cannot be zero.
-   * - `tokenId` must be owned by `from`.
-   * - If the caller is not `from`, it must be have been allowed to move this
-   * NFT by either `approve` or `setApprovalForAll`.
-   */
-  function safeTransferFrom(address from, address to, uint256 tokenId) public;
-
-  /**
-   * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
-   * another (`to`).
-   *
-   * Requirements:
-   * - If the caller is not `from`, it must be approved to move this NFT by
-   * either `approve` or `setApprovalForAll`.
-   */
-  function transferFrom(address from, address to, uint256 tokenId) public;
-
-  function approve(address to, uint256 tokenId) public;
-
-  function getApproved(uint256 tokenId) public view returns (address operator);
-
-  function setApprovalForAll(address operator, bool _approved) public;
-
-  function isApprovedForAll(
-    address owner,
-    address operator
-  ) public view returns (bool);
-
-  function safeTransferFrom(
-    address from,
-    address to,
-    uint256 tokenId,
-    bytes memory data
-  ) public;
-}
-
-// import '@openzeppelin/contracts-ethereum-package/contracts/token/ERC721/IERC721Enumerable.sol';
-/**
- * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
- * @dev See https://eips.ethereum.org/EIPS/eip-721
- */
-contract IERC721Enumerable is Initializable, IERC721 {
-  function totalSupply() public view returns (uint256);
-
-  function tokenOfOwnerByIndex(
-    address owner,
-    uint256 index
-  ) public view returns (uint256 tokenId);
-
-  function tokenByIndex(uint256 index) public view returns (uint256);
-}
-
-/**
- * @title The PublicLock Interface
- */
-
-contract IPublicLockV6 is IERC721Enumerable {
-  // See indentationissue description here:
-  // https://github.com/duaraghav8/Ethlint/issues/268
-  // solium-disable indentation
-
-  /// Events
-  event Destroy(uint balance, address indexed owner);
-
-  event Disable();
-
-  event Withdrawal(
-    address indexed sender,
-    address indexed tokenAddress,
-    address indexed beneficiary,
-    uint amount
-  );
-
-  event CancelKey(
-    uint indexed tokenId,
-    address indexed owner,
-    address indexed sendTo,
-    uint refund
-  );
-
-  event RefundPenaltyChanged(
-    uint freeTrialLength,
-    uint refundPenaltyBasisPoints
-  );
-
-  event PricingChanged(
-    uint oldKeyPrice,
-    uint keyPrice,
-    address oldTokenAddress,
-    address tokenAddress
-  );
-
-  event ExpireKey(uint indexed tokenId);
-
-  event NewLockSymbol(string symbol);
-
-  event TransferFeeChanged(uint transferFeeBasisPoints);
-
-  /// @notice emits anytime the nonce used for off-chain approvals changes.
-  event NonceChanged(address indexed keyOwner, uint nextAvailableNonce);
-
-  ///===================================================================
-
-  /// Functions
-
-  function initialize(
-    address _owner,
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys,
-    string calldata _lockName
-  ) external;
-
-  /**
-   * @notice The version number of the current implementation on this network.
-   * @return The current version number.
-   */
-  function publicLockVersion() public pure returns (uint);
-
-  /**
-   * @notice Gets the current balance of the account provided.
-   * @param _tokenAddress The token type to retrieve the balance of.
-   * @param _account The account to get the balance of.
-   * @return The number of tokens of the given type for the given address, possibly 0.
-   */
-  function getBalance(
-    address _tokenAddress,
-    address _account
-  ) external view returns (uint);
-
-  /**
-   * @notice Used to disable lock before migrating keys and/or destroying contract.
-   * @dev Throws if called by other than the owner.
-   * @dev Throws if lock contract has already been disabled.
-   */
-  function disableLock() external;
-
-  /**
-   * @notice Used to clean up old lock contracts from the blockchain.
-   * TODO: add a check to ensure all keys are INVALID!
-   * @dev Throws if called by other than owner.
-   * @dev Throws if lock has not yet been disabled.
-   */
-  function destroyLock() external;
-
-  /**
-   * @dev Called by owner to withdraw all funds from the lock and send them to the `beneficiary`.
-   * @dev Throws if called by other than the owner or beneficiary
-   * @param _tokenAddress specifies the token address to withdraw or 0 for ETH. This is usually
-   * the same as `tokenAddress` in MixinFunds.
-   * @param _amount specifies the max amount to withdraw, which may be reduced when
-   * considering the available balance. Set to 0 or MAX_UINT to withdraw everything.
-   *  -- however be wary of draining funds as it breaks the `cancelAndRefund` and `fullRefund`
-   * use cases.
-   */
-  function withdraw(address _tokenAddress, uint _amount) external;
-
-  /**
-   * A function which lets the owner of the lock to change the price for future purchases.
-   * @dev Throws if called by other than owner
-   * @dev Throws if lock has been disabled
-   * @dev Throws if _tokenAddress is not a valid token
-   * @param _keyPrice The new price to set for keys
-   * @param _tokenAddress The address of the erc20 token to use for pricing the keys,
-   * or 0 to use ETH
-   */
-  function updateKeyPricing(uint _keyPrice, address _tokenAddress) external;
-
-  /**
-   * A function which lets the owner of the lock update the beneficiary account,
-   * which receives funds on withdrawal.
-   * @dev Throws if called by other than owner of beneficiary
-   * @dev Throws if _beneficiary is address(0)
-   * @param _beneficiary The new address to set as the beneficiary
-   */
-  function updateBeneficiary(address _beneficiary) external;
-
-  /**
-   * A function which lets the owner of the lock expire a users' key.
-   * @dev Throws if called by other than lock owner
-   * @dev Throws if key owner does not have a valid key
-   * @param _owner The address of the key owner
-   */
-  function expireKeyFor(address _owner) external;
-
-  /**
-   * Checks if the user has a non-expired key.
-   * @param _owner The address of the key owner
-   */
-  function getHasValidKey(address _owner) external view returns (bool);
-
-  /**
-   * @notice Find the tokenId for a given user
-   * @return The tokenId of the NFT, else revert
-   * @dev Throws if key owner does not have a valid key
-   * @param _account The address of the key owner
-   */
-  function getTokenIdFor(address _account) external view returns (uint);
-
-  /**
-   * A function which returns a subset of the keys for this Lock as an array
-   * @param _page the page of key owners requested when faceted by page size
-   * @param _pageSize the number of Key Owners requested per page
-   * @dev Throws if there are no key owners yet
-   */
-  function getOwnersByPage(
-    uint _page,
-    uint _pageSize
-  ) external view returns (address[] memory);
-
-  /**
-   * Checks if the given address owns the given tokenId.
-   * @param _tokenId The tokenId of the key to check
-   * @param _owner The potential key owners address
-   */
-  function isKeyOwner(
-    uint _tokenId,
-    address _owner
-  ) external view returns (bool);
-
-  /**
-   * @dev Returns the key's ExpirationTimestamp field for a given owner.
-   * @param _owner address of the user for whom we search the key
-   * @dev Throws if owner has never owned a key for this lock
-   */
-  function keyExpirationTimestampFor(
-    address _owner
-  ) external view returns (uint timestamp);
-
-  /**
-   * Public function which returns the total number of unique owners (both expired
-   * and valid).  This may be larger than totalSupply.
-   */
-  function numberOfOwners() external view returns (uint);
-
-  /**
-   * Allows the Lock owner to assign a descriptive name for this Lock.
-   * @param _lockName The new name for the lock
-   * @dev Throws if called by other than the lock owner
-   */
-  function updateLockName(string calldata _lockName) external;
-
-  /**
-   * Allows the Lock owner to assign a Symbol for this Lock.
-   * @param _lockSymbol The new Symbol for the lock
-   * @dev Throws if called by other than the lock owner
-   */
-  function updateLockSymbol(string calldata _lockSymbol) external;
-
-  /**
-   * @dev Gets the token symbol
-   * @return string representing the token symbol
-   */
-  function symbol() external view returns (string memory);
-
-  /**
-   * Allows the Lock owner to update the baseTokenURI for this Lock.
-   * @dev Throws if called by other than the lock owner
-   * @param _baseTokenURI String representing the base of the URI for this lock.
-   */
-  function setBaseTokenURI(string calldata _baseTokenURI) external;
-
-  /**  @notice A distinct Uniform Resource Identifier (URI) for a given asset.
-   * @dev Throws if `_tokenId` is not a valid NFT. URIs are defined in RFC
-   *  3986. The URI may point to a JSON file that conforms to the "ERC721
-   *  Metadata JSON Schema".
-   * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
-   * @param _tokenId The tokenID we're inquiring about
-   * @return String representing the URI for the requested token
-   */
-  function tokenURI(uint256 _tokenId) external view returns (string memory);
-
-  /**
-   * Allows the Lock owner to give a collection of users a key with no charge.
-   * Each key may be assigned a different expiration date.
-   * @dev Throws if called by other than the lock-owner
-   * @param _recipients An array of receiving addresses
-   * @param _expirationTimestamps An array of expiration Timestamps for the keys being granted
-   */
-  function grantKeys(
-    address[] calldata _recipients,
-    uint[] calldata _expirationTimestamps
-  ) external;
-
-  /**
-   * @dev Purchase function
-   * @param _value the number of tokens to pay for this purchase >= the current keyPrice - any applicable discount
-   * (_value is ignored when using ETH)
-   * @param _recipient address of the recipient of the purchased key
-   * @param _referrer address of the user making the referral
-   * @param _data arbitrary data populated by the front-end which initiated the sale
-   * @dev Throws if lock is disabled. Throws if lock is sold-out. Throws if _recipient == address(0).
-   * @dev Setting _value to keyPrice exactly doubles as a security feature. That way if the lock owner increases the
-   * price while my transaction is pending I can't be charged more than I expected (only applicable to ERC-20 when more
-   * than keyPrice is approved for spending).
-   */
-  function purchase(
-    uint256 _value,
-    address _recipient,
-    address _referrer,
-    bytes calldata _data
-  ) external payable;
-
-  /**
-   * Allow the Lock owner to change the transfer fee.
-   * @dev Throws if called by other than lock-owner
-   * @param _transferFeeBasisPoints The new transfer fee in basis-points(bps).
-   * Ex: 200 bps = 2%
-   */
-  function updateTransferFee(uint _transferFeeBasisPoints) external;
-
-  /**
-   * Determines how much of a fee a key owner would need to pay in order to
-   * transfer the key to another account.  This is pro-rated so the fee goes down
-   * overtime.
-   * @dev Throws if _owner does not have a valid key
-   * @param _owner The owner of the key check the transfer fee for.
-   * @param _time The amount of time to calculate the fee for.
-   * @return The transfer fee in seconds.
-   */
-  function getTransferFee(
-    address _owner,
-    uint _time
-  ) external view returns (uint);
-
-  /**
-   * @dev Invoked by the lock owner to destroy the user's key and perform a refund and cancellation of the key
-   * @param _keyOwner The key owner to whom we wish to send a refund to
-   * @param amount The amount to refund the key-owner
-   * @dev Throws if called by other than owner
-   * @dev Throws if _keyOwner does not have a valid key
-   */
-  function fullRefund(address _keyOwner, uint amount) external;
-
-  /**
-   * @notice Destroys the msg.sender's key and sends a refund based on the amount of time remaining.
-   */
-  function cancelAndRefund() external;
-
-  /**
-   * @dev Cancels a key owned by a different user and sends the funds to the msg.sender.
-   * @param _keyOwner this user's key will be canceled
-   * @param _v _r _s getCancelAndRefundApprovalHash signed by the _keyOwner
-   */
-  function cancelAndRefundFor(
-    address _keyOwner,
-    uint8 _v,
-    bytes32 _r,
-    bytes32 _s
-  ) external;
-
-  /**
-   * @notice Sets the minimum nonce for a valid off-chain approval message from the
-   * senders account.
-   * @dev This can be used to invalidate a previously signed message.
-   */
-  function invalidateOffchainApproval(uint _nextAvailableNonce) external;
-
-  /**
-   * Allow the owner to change the refund penalty.
-   * @dev Throws if called by other than owner
-   * @param _freeTrialLength The new duration of free trials for this lock
-   * @param _refundPenaltyBasisPoints The new refund penaly in basis-points(bps)
-   */
-  function updateRefundPenalty(
-    uint _freeTrialLength,
-    uint _refundPenaltyBasisPoints
-  ) external;
-
-  /**
-   * @dev Determines how much of a refund a key owner would receive if they issued
-   * @param _owner The key owner to get the refund value for.
-   * a cancelAndRefund block.timestamp.
-   * Note that due to the time required to mine a tx, the actual refund amount will be lower
-   * than what the user reads from this call.
-   */
-  function getCancelAndRefundValueFor(
-    address _owner
-  ) external view returns (uint refund);
-
-  function keyOwnerToNonce(address) external view returns (uint256);
-
-  /**
-   * @notice returns the hash to sign in order to allow another user to cancel on your behalf.
-   * @dev this can be computed in JS instead of read from the contract.
-   * @param _keyOwner The key owner's address (also the message signer)
-   * @param _txSender The address cancelling cancel on behalf of the keyOwner
-   * @return approvalHash The hash to sign
-   */
-  function getCancelAndRefundApprovalHash(
-    address _keyOwner,
-    address _txSender
-  ) external view returns (bytes32 approvalHash);
-
-  ///===================================================================
-  /// Auto-generated getter functions from public state variables
-
-  function beneficiary() external view returns (address);
-
-  function erc1820() external view returns (address);
-
-  function expirationDuration() external view returns (uint256);
-
-  function freeTrialLength() external view returns (uint256);
-
-  function isAlive() external view returns (bool);
-
-  function keyCancelInterfaceId() external view returns (bytes32);
-
-  function keySoldInterfaceId() external view returns (bytes32);
-
-  function keyPrice() external view returns (uint256);
-
-  function maxNumberOfKeys() external view returns (uint256);
-
-  function owners(uint256) external view returns (address);
-
-  function refundPenaltyBasisPoints() external view returns (uint256);
-
-  function tokenAddress() external view returns (address);
-
-  function transferFeeBasisPoints() external view returns (uint256);
-
-  function unlockProtocol() external view returns (address);
-
-  function BASIS_POINTS_DEN() external view returns (uint256);
-
-  /// @notice The typehash per the EIP-712 standard
-  /// @dev This can be computed in JS instead of read from the contract
-  function CANCEL_TYPEHASH() external view returns (bytes32);
-
-  ///===================================================================
-
-  /**
-   * @notice Allows the key owner to safely share their key (parent key) by
-   * transferring a portion of the remaining time to a new key (child key).
-   * @dev Throws if key is not valid.
-   * @dev Throws if `_to` is the zero address
-   * @param _to The recipient of the shared key
-   * @param _tokenId the key to share
-   * @param _timeShared The amount of time shared
-   * checks if `_to` is a smart contract (code size > 0). If so, it calls
-   * `onERC721Received` on `_to` and throws if the return value is not
-   * `bytes4(keccak256('onERC721Received(address,address,uint,bytes)'))`.
-   * @dev Emit Transfer event
-   */
-  function shareKey(address _to, uint _tokenId, uint _timeShared) external;
-
-  /// @notice A descriptive name for a collection of NFTs in this contract
-  function name() external view returns (string memory _name);
-
-  ///===================================================================
-
-  /// From Openzeppelin's Ownable.sol
-  function owner() external view returns (address);
-
-  function isOwner() external view returns (bool);
-
-  function renounceOwnership() external;
-
-  function transferOwnership(address newOwner) external;
-
-  ///===================================================================
-
-  /// From ERC165.sol
-  function supportsInterface(bytes4 interfaceId) external view returns (bool);
-  ///===================================================================
-}
diff --git a/packages/contracts/src/contracts/PublicLock/IPublicLockV7.sol b/packages/contracts/src/contracts/PublicLock/IPublicLockV7.sol
deleted file mode 100644
index d627a636309..00000000000
--- a/packages/contracts/src/contracts/PublicLock/IPublicLockV7.sol
+++ /dev/null
@@ -1,467 +0,0 @@
-pragma solidity ^0.5.0;
-
-/**
- * @title The PublicLock Interface
- */
-
-contract IPublicLockV7 {
-  // See indentationissue description here:
-  // https://github.com/duaraghav8/Ethlint/issues/268
-  // solium-disable indentation
-
-  /// Functions
-
-  function initialize(
-    address _lockCreator,
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys,
-    string calldata _lockName
-  ) external;
-
-  /**
-   * @notice Allow the contract to accept tips in ETH sent directly to the contract.
-   * @dev This is okay to use even if the lock is priced in ERC-20 tokens
-   */
-  function() external payable;
-
-  /**
-   * @dev Never used directly
-   */
-  function initialize() external;
-
-  /**
-   * @notice The version number of the current implementation on this network.
-   * @return The current version number.
-   */
-  function publicLockVersion() public pure returns (uint);
-
-  /**
-   * @notice Gets the current balance of the account provided.
-   * @param _tokenAddress The token type to retrieve the balance of.
-   * @param _account The account to get the balance of.
-   * @return The number of tokens of the given type for the given address, possibly 0.
-   */
-  function getBalance(
-    address _tokenAddress,
-    address _account
-  ) external view returns (uint);
-
-  /**
-   * @notice Used to disable lock before migrating keys and/or destroying contract.
-   * @dev Throws if called by other than a lock manager.
-   * @dev Throws if lock contract has already been disabled.
-   */
-  function disableLock() external;
-
-  /**
-   * @dev Called by a lock manager or beneficiary to withdraw all funds from the lock and send them to the `beneficiary`.
-   * @dev Throws if called by other than a lock manager or beneficiary
-   * @param _tokenAddress specifies the token address to withdraw or 0 for ETH. This is usually
-   * the same as `tokenAddress` in MixinFunds.
-   * @param _amount specifies the max amount to withdraw, which may be reduced when
-   * considering the available balance. Set to 0 or MAX_UINT to withdraw everything.
-   *  -- however be wary of draining funds as it breaks the `cancelAndRefund` and `expireAndRefundFor`
-   * use cases.
-   */
-  function withdraw(address _tokenAddress, uint _amount) external;
-
-  /**
-   * A function which lets a Lock manager of the lock to change the price for future purchases.
-   * @dev Throws if called by other than a Lock manager
-   * @dev Throws if lock has been disabled
-   * @dev Throws if _tokenAddress is not a valid token
-   * @param _keyPrice The new price to set for keys
-   * @param _tokenAddress The address of the erc20 token to use for pricing the keys,
-   * or 0 to use ETH
-   */
-  function updateKeyPricing(uint _keyPrice, address _tokenAddress) external;
-
-  /**
-   * A function which lets a Lock manager update the beneficiary account,
-   * which receives funds on withdrawal.
-   * @dev Throws if called by other than a Lock manager or beneficiary
-   * @dev Throws if _beneficiary is address(0)
-   * @param _beneficiary The new address to set as the beneficiary
-   */
-  function updateBeneficiary(address _beneficiary) external;
-
-  /**
-   * Checks if the user has a non-expired key.
-   * @param _user The address of the key owner
-   */
-  function getHasValidKey(address _user) external view returns (bool);
-
-  /**
-   * @notice Find the tokenId for a given user
-   * @return The tokenId of the NFT, else returns 0
-   * @param _account The address of the key owner
-   */
-  function getTokenIdFor(address _account) external view returns (uint);
-
-  /**
-   * A function which returns a subset of the keys for this Lock as an array
-   * @param _page the page of key owners requested when faceted by page size
-   * @param _pageSize the number of Key Owners requested per page
-   * @dev Throws if there are no key owners yet
-   */
-  function getOwnersByPage(
-    uint _page,
-    uint _pageSize
-  ) external view returns (address[] memory);
-
-  /**
-   * Checks if the given address owns the given tokenId.
-   * @param _tokenId The tokenId of the key to check
-   * @param _keyOwner The potential key owners address
-   */
-  function isKeyOwner(
-    uint _tokenId,
-    address _keyOwner
-  ) external view returns (bool);
-
-  /**
-   * @dev Returns the key's ExpirationTimestamp field for a given owner.
-   * @param _keyOwner address of the user for whom we search the key
-   * @dev Returns 0 if the owner has never owned a key for this lock
-   */
-  function keyExpirationTimestampFor(
-    address _keyOwner
-  ) external view returns (uint timestamp);
-
-  /**
-   * Public function which returns the total number of unique owners (both expired
-   * and valid).  This may be larger than totalSupply.
-   */
-  function numberOfOwners() external view returns (uint);
-
-  /**
-   * Allows a Lock manager to assign a descriptive name for this Lock.
-   * @param _lockName The new name for the lock
-   * @dev Throws if called by other than a Lock manager
-   */
-  function updateLockName(string calldata _lockName) external;
-
-  /**
-   * Allows a Lock manager to assign a Symbol for this Lock.
-   * @param _lockSymbol The new Symbol for the lock
-   * @dev Throws if called by other than a Lock manager
-   */
-  function updateLockSymbol(string calldata _lockSymbol) external;
-
-  /**
-   * @dev Gets the token symbol
-   * @return string representing the token symbol
-   */
-  function symbol() external view returns (string memory);
-
-  /**
-   * Allows a Lock manager to update the baseTokenURI for this Lock.
-   * @dev Throws if called by other than a Lock manager
-   * @param _baseTokenURI String representing the base of the URI for this lock.
-   */
-  function setBaseTokenURI(string calldata _baseTokenURI) external;
-
-  /**  @notice A distinct Uniform Resource Identifier (URI) for a given asset.
-   * @dev Throws if `_tokenId` is not a valid NFT. URIs are defined in RFC
-   *  3986. The URI may point to a JSON file that conforms to the "ERC721
-   *  Metadata JSON Schema".
-   * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
-   * @param _tokenId The tokenID we're inquiring about
-   * @return String representing the URI for the requested token
-   */
-  function tokenURI(uint256 _tokenId) external view returns (string memory);
-
-  /**
-   * Allows a Lock manager to add or remove an event hook
-   * @param _onKeyPurchaseHook Hook called when the `purchase` function is called
-   * @param _onKeyCancelHook Hook called when the internal `_cancelAndRefund` function is called
-   */
-  function setEventHooks(
-    address _onKeyPurchaseHook,
-    address _onKeyCancelHook
-  ) external;
-
-  /**
-   * Allows a Lock manager to give a collection of users a key with no charge.
-   * Each key may be assigned a different expiration date.
-   * @dev Throws if called by other than a Lock manager
-   * @param _recipients An array of receiving addresses
-   * @param _expirationTimestamps An array of expiration Timestamps for the keys being granted
-   */
-  function grantKeys(
-    address[] calldata _recipients,
-    uint[] calldata _expirationTimestamps,
-    address[] calldata _keyManagers
-  ) external;
-
-  /**
-   * @dev Purchase function
-   * @param _value the number of tokens to pay for this purchase >= the current keyPrice - any applicable discount
-   * (_value is ignored when using ETH)
-   * @param _recipient address of the recipient of the purchased key
-   * @param _referrer address of the user making the referral
-   * @param _data arbitrary data populated by the front-end which initiated the sale
-   * @dev Throws if lock is disabled. Throws if lock is sold-out. Throws if _recipient == address(0).
-   * @dev Setting _value to keyPrice exactly doubles as a security feature. That way if a Lock manager increases the
-   * price while my transaction is pending I can't be charged more than I expected (only applicable to ERC-20 when more
-   * than keyPrice is approved for spending).
-   */
-  function purchase(
-    uint256 _value,
-    address _recipient,
-    address _referrer,
-    bytes calldata _data
-  ) external payable;
-
-  /**
-   * @notice returns the minimum price paid for a purchase with these params.
-   * @dev this considers any discount from Unlock or the OnKeyPurchase hook.
-   */
-  function purchasePriceFor(
-    address _recipient,
-    address _referrer,
-    bytes calldata _data
-  ) external view returns (uint);
-
-  /**
-   * Allow a Lock manager to change the transfer fee.
-   * @dev Throws if called by other than a Lock manager
-   * @param _transferFeeBasisPoints The new transfer fee in basis-points(bps).
-   * Ex: 200 bps = 2%
-   */
-  function updateTransferFee(uint _transferFeeBasisPoints) external;
-
-  /**
-   * Determines how much of a fee a key owner would need to pay in order to
-   * transfer the key to another account.  This is pro-rated so the fee goes down
-   * overtime.
-   * @dev Throws if _keyOwner does not have a valid key
-   * @param _keyOwner The owner of the key check the transfer fee for.
-   * @param _time The amount of time to calculate the fee for.
-   * @return The transfer fee in seconds.
-   */
-  function getTransferFee(
-    address _keyOwner,
-    uint _time
-  ) external view returns (uint);
-
-  /**
-   * @dev Invoked by a Lock manager to expire the user's key and perform a refund and cancellation of the key
-   * @param _keyOwner The key owner to whom we wish to send a refund to
-   * @param amount The amount to refund the key-owner
-   * @dev Throws if called by other than a Lock manager
-   * @dev Throws if _keyOwner does not have a valid key
-   */
-  function expireAndRefundFor(address _keyOwner, uint amount) external;
-
-  /**
-   * @dev allows the key manager to expire a given tokenId
-   * and send a refund to the keyOwner based on the amount of time remaining.
-   * @param _tokenId The id of the key to cancel.
-   */
-  function cancelAndRefund(uint _tokenId) external;
-
-  /**
-   * @dev Cancels a key managed by a different user and sends the funds to the keyOwner.
-   * @param _keyManager the key managed by this user will be canceled
-   * @param _v _r _s getCancelAndRefundApprovalHash signed by the _keyManager
-   * @param _tokenId The key to cancel
-   */
-  function cancelAndRefundFor(
-    address _keyManager,
-    uint8 _v,
-    bytes32 _r,
-    bytes32 _s,
-    uint _tokenId
-  ) external;
-
-  /**
-   * @notice Sets the minimum nonce for a valid off-chain approval message from the
-   * senders account.
-   * @dev This can be used to invalidate a previously signed message.
-   */
-  function invalidateOffchainApproval(uint _nextAvailableNonce) external;
-
-  /**
-   * Allow a Lock manager to change the refund penalty.
-   * @dev Throws if called by other than a Lock manager
-   * @param _freeTrialLength The new duration of free trials for this lock
-   * @param _refundPenaltyBasisPoints The new refund penaly in basis-points(bps)
-   */
-  function updateRefundPenalty(
-    uint _freeTrialLength,
-    uint _refundPenaltyBasisPoints
-  ) external;
-
-  /**
-   * @dev Determines how much of a refund a key owner would receive if they issued
-   * @param _keyOwner The key owner to get the refund value for.
-   * a cancelAndRefund block.timestamp.
-   * Note that due to the time required to mine a tx, the actual refund amount will be lower
-   * than what the user reads from this call.
-   */
-  function getCancelAndRefundValueFor(
-    address _keyOwner
-  ) external view returns (uint refund);
-
-  function keyManagerToNonce(address) external view returns (uint256);
-
-  /**
-   * @notice returns the hash to sign in order to allow another user to cancel on your behalf.
-   * @dev this can be computed in JS instead of read from the contract.
-   * @param _keyManager The key manager's address (also the message signer)
-   * @param _txSender The address cancelling cancel on behalf of the keyOwner
-   * @return approvalHash The hash to sign
-   */
-  function getCancelAndRefundApprovalHash(
-    address _keyManager,
-    address _txSender
-  ) external view returns (bytes32 approvalHash);
-
-  function addKeyGranter(address account) external;
-
-  function addLockManager(address account) external;
-
-  function isKeyGranter(address account) external view returns (bool);
-
-  function isLockManager(address account) external view returns (bool);
-
-  function onKeyPurchaseHook() external view returns (address);
-
-  function onKeyCancelHook() external view returns (address);
-
-  function revokeKeyGranter(address _granter) external;
-
-  function renounceLockManager() external;
-
-  ///===================================================================
-  /// Auto-generated getter functions from public state variables
-
-  function beneficiary() external view returns (address);
-
-  function expirationDuration() external view returns (uint256);
-
-  function freeTrialLength() external view returns (uint256);
-
-  function isAlive() external view returns (bool);
-
-  function keyPrice() external view returns (uint256);
-
-  function maxNumberOfKeys() external view returns (uint256);
-
-  function owners(uint256) external view returns (address);
-
-  function refundPenaltyBasisPoints() external view returns (uint256);
-
-  function tokenAddress() external view returns (address);
-
-  function transferFeeBasisPoints() external view returns (uint256);
-
-  function unlockProtocol() external view returns (address);
-
-  function keyManagerOf(uint) external view returns (address);
-
-  ///===================================================================
-
-  /**
-   * @notice Allows the key owner to safely share their key (parent key) by
-   * transferring a portion of the remaining time to a new key (child key).
-   * @dev Throws if key is not valid.
-   * @dev Throws if `_to` is the zero address
-   * @param _to The recipient of the shared key
-   * @param _tokenId the key to share
-   * @param _timeShared The amount of time shared
-   * checks if `_to` is a smart contract (code size > 0). If so, it calls
-   * `onERC721Received` on `_to` and throws if the return value is not
-   * `bytes4(keccak256('onERC721Received(address,address,uint,bytes)'))`.
-   * @dev Emit Transfer event
-   */
-  function shareKey(address _to, uint _tokenId, uint _timeShared) external;
-
-  /**
-   * @notice Update transfer and cancel rights for a given key
-   * @param _tokenId The id of the key to assign rights for
-   * @param _keyManager The address to assign the rights to for the given key
-   */
-  function setKeyManagerOf(uint _tokenId, address _keyManager) external;
-
-  /// @notice A descriptive name for a collection of NFTs in this contract
-  function name() external view returns (string memory _name);
-
-  ///===================================================================
-
-  /// From ERC165.sol
-  function supportsInterface(bytes4 interfaceId) external view returns (bool);
-
-  ///===================================================================
-
-  /// From ERC-721
-  /**
-   * @dev Returns the number of NFTs in `owner`'s account.
-   */
-  function balanceOf(address _owner) public view returns (uint256 balance);
-
-  /**
-   * @dev Returns the owner of the NFT specified by `tokenId`.
-   */
-  function ownerOf(uint256 tokenId) public view returns (address _owner);
-
-  /**
-   * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
-   * another (`to`).
-   *
-   *
-   *
-   * Requirements:
-   * - `from`, `to` cannot be zero.
-   * - `tokenId` must be owned by `from`.
-   * - If the caller is not `from`, it must be have been allowed to move this
-   * NFT by either `approve` or `setApprovalForAll`.
-   */
-  function safeTransferFrom(address from, address to, uint256 tokenId) public;
-
-  /**
-   * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
-   * another (`to`).
-   *
-   * Requirements:
-   * - If the caller is not `from`, it must be approved to move this NFT by
-   * either `approve` or `setApprovalForAll`.
-   */
-  function transferFrom(address from, address to, uint256 tokenId) public;
-
-  function approve(address to, uint256 tokenId) public;
-
-  /**
-   * @notice Get the approved address for a single NFT
-   * @dev Throws if `_tokenId` is not a valid NFT.
-   * @param _tokenId The NFT to find the approved address for
-   * @return The approved address for this NFT, or the zero address if there is none
-   */
-  function getApproved(uint256 _tokenId) public view returns (address operator);
-
-  function setApprovalForAll(address operator, bool _approved) public;
-
-  function isApprovedForAll(
-    address _owner,
-    address operator
-  ) public view returns (bool);
-
-  function safeTransferFrom(
-    address from,
-    address to,
-    uint256 tokenId,
-    bytes memory data
-  ) public;
-
-  function totalSupply() public view returns (uint256);
-
-  function tokenOfOwnerByIndex(
-    address _owner,
-    uint256 index
-  ) public view returns (uint256 tokenId);
-
-  function tokenByIndex(uint256 index) public view returns (uint256);
-}
diff --git a/packages/contracts/src/contracts/PublicLock/IPublicLockV7Sol6.sol b/packages/contracts/src/contracts/PublicLock/IPublicLockV7Sol6.sol
deleted file mode 100644
index 150c5d3dc91..00000000000
--- a/packages/contracts/src/contracts/PublicLock/IPublicLockV7Sol6.sol
+++ /dev/null
@@ -1,469 +0,0 @@
-pragma solidity ^0.6.0;
-
-/**
- * @title The PublicLock Interface
- */
-
-interface IPublicLockV7Sol6 {
-  // See indentationissue description here:
-  // https://github.com/duaraghav8/Ethlint/issues/268
-  // solium-disable indentation
-
-  /// Functions
-
-  function initialize(
-    address _lockCreator,
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys,
-    string calldata _lockName
-  ) external;
-
-  /**
-   * @notice Allow the contract to accept tips in ETH sent directly to the contract.
-   * @dev This is okay to use even if the lock is priced in ERC-20 tokens
-   */
-  receive() external payable;
-
-  /**
-   * @dev Never used directly
-   */
-  function initialize() external;
-
-  /**
-   * @notice The version number of the current implementation on this network.
-   * @return The current version number.
-   */
-  function publicLockVersion() external pure returns (uint);
-
-  /**
-   * @notice Gets the current balance of the account provided.
-   * @param _tokenAddress The token type to retrieve the balance of.
-   * @param _account The account to get the balance of.
-   * @return The number of tokens of the given type for the given address, possibly 0.
-   */
-  function getBalance(
-    address _tokenAddress,
-    address _account
-  ) external view returns (uint);
-
-  /**
-   * @notice Used to disable lock before migrating keys and/or destroying contract.
-   * @dev Throws if called by other than a lock manager.
-   * @dev Throws if lock contract has already been disabled.
-   */
-  function disableLock() external;
-
-  /**
-   * @dev Called by a lock manager or beneficiary to withdraw all funds from the lock and send them to the `beneficiary`.
-   * @dev Throws if called by other than a lock manager or beneficiary
-   * @param _tokenAddress specifies the token address to withdraw or 0 for ETH. This is usually
-   * the same as `tokenAddress` in MixinFunds.
-   * @param _amount specifies the max amount to withdraw, which may be reduced when
-   * considering the available balance. Set to 0 or MAX_UINT to withdraw everything.
-   *  -- however be wary of draining funds as it breaks the `cancelAndRefund` and `expireAndRefundFor`
-   * use cases.
-   */
-  function withdraw(address _tokenAddress, uint _amount) external;
-
-  /**
-   * A function which lets a Lock manager of the lock to change the price for future purchases.
-   * @dev Throws if called by other than a Lock manager
-   * @dev Throws if lock has been disabled
-   * @dev Throws if _tokenAddress is not a valid token
-   * @param _keyPrice The new price to set for keys
-   * @param _tokenAddress The address of the erc20 token to use for pricing the keys,
-   * or 0 to use ETH
-   */
-  function updateKeyPricing(uint _keyPrice, address _tokenAddress) external;
-
-  /**
-   * A function which lets a Lock manager update the beneficiary account,
-   * which receives funds on withdrawal.
-   * @dev Throws if called by other than a Lock manager or beneficiary
-   * @dev Throws if _beneficiary is address(0)
-   * @param _beneficiary The new address to set as the beneficiary
-   */
-  function updateBeneficiary(address _beneficiary) external;
-
-  /**
-   * Checks if the user has a non-expired key.
-   * @param _user The address of the key owner
-   */
-  function getHasValidKey(address _user) external view returns (bool);
-
-  /**
-   * @notice Find the tokenId for a given user
-   * @return The tokenId of the NFT, else returns 0
-   * @param _account The address of the key owner
-   */
-  function getTokenIdFor(address _account) external view returns (uint);
-
-  /**
-   * A function which returns a subset of the keys for this Lock as an array
-   * @param _page the page of key owners requested when faceted by page size
-   * @param _pageSize the number of Key Owners requested per page
-   * @dev Throws if there are no key owners yet
-   */
-  function getOwnersByPage(
-    uint _page,
-    uint _pageSize
-  ) external view returns (address[] memory);
-
-  /**
-   * Checks if the given address owns the given tokenId.
-   * @param _tokenId The tokenId of the key to check
-   * @param _keyOwner The potential key owners address
-   */
-  function isKeyOwner(
-    uint _tokenId,
-    address _keyOwner
-  ) external view returns (bool);
-
-  /**
-   * @dev Returns the key's ExpirationTimestamp field for a given owner.
-   * @param _keyOwner address of the user for whom we search the key
-   * @dev Returns 0 if the owner has never owned a key for this lock
-   */
-  function keyExpirationTimestampFor(
-    address _keyOwner
-  ) external view returns (uint timestamp);
-
-  /**
-   * external function which returns the total number of unique owners (both expired
-   * and valid).  This may be larger than totalSupply.
-   */
-  function numberOfOwners() external view returns (uint);
-
-  /**
-   * Allows a Lock manager to assign a descriptive name for this Lock.
-   * @param _lockName The new name for the lock
-   * @dev Throws if called by other than a Lock manager
-   */
-  function updateLockName(string calldata _lockName) external;
-
-  /**
-   * Allows a Lock manager to assign a Symbol for this Lock.
-   * @param _lockSymbol The new Symbol for the lock
-   * @dev Throws if called by other than a Lock manager
-   */
-  function updateLockSymbol(string calldata _lockSymbol) external;
-
-  /**
-   * @dev Gets the token symbol
-   * @return string representing the token symbol
-   */
-  function symbol() external view returns (string memory);
-
-  /**
-   * Allows a Lock manager to update the baseTokenURI for this Lock.
-   * @dev Throws if called by other than a Lock manager
-   * @param _baseTokenURI String representing the base of the URI for this lock.
-   */
-  function setBaseTokenURI(string calldata _baseTokenURI) external;
-
-  /**  @notice A distinct Uniform Resource Identifier (URI) for a given asset.
-   * @dev Throws if `_tokenId` is not a valid NFT. URIs are defined in RFC
-   *  3986. The URI may point to a JSON file that conforms to the "ERC721
-   *  Metadata JSON Schema".
-   * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
-   * @param _tokenId The tokenID we're inquiring about
-   * @return String representing the URI for the requested token
-   */
-  function tokenURI(uint256 _tokenId) external view returns (string memory);
-
-  /**
-   * Allows a Lock manager to add or remove an event hook
-   * @param _onKeyPurchaseHook Hook called when the `purchase` function is called
-   * @param _onKeyCancelHook Hook called when the internal `_cancelAndRefund` function is called
-   */
-  function setEventHooks(
-    address _onKeyPurchaseHook,
-    address _onKeyCancelHook
-  ) external;
-
-  /**
-   * Allows a Lock manager to give a collection of users a key with no charge.
-   * Each key may be assigned a different expiration date.
-   * @dev Throws if called by other than a Lock manager
-   * @param _recipients An array of receiving addresses
-   * @param _expirationTimestamps An array of expiration Timestamps for the keys being granted
-   */
-  function grantKeys(
-    address[] calldata _recipients,
-    uint[] calldata _expirationTimestamps,
-    address[] calldata _keyManagers
-  ) external;
-
-  /**
-   * @dev Purchase function
-   * @param _value the number of tokens to pay for this purchase >= the current keyPrice - any applicable discount
-   * (_value is ignored when using ETH)
-   * @param _recipient address of the recipient of the purchased key
-   * @param _referrer address of the user making the referral
-   * @param _data arbitrary data populated by the front-end which initiated the sale
-   * @dev Throws if lock is disabled. Throws if lock is sold-out. Throws if _recipient == address(0).
-   * @dev Setting _value to keyPrice exactly doubles as a security feature. That way if a Lock manager increases the
-   * price while my transaction is pending I can't be charged more than I expected (only applicable to ERC-20 when more
-   * than keyPrice is approved for spending).
-   */
-  function purchase(
-    uint256 _value,
-    address _recipient,
-    address _referrer,
-    bytes calldata _data
-  ) external payable;
-
-  /**
-   * @notice returns the minimum price paid for a purchase with these params.
-   * @dev this considers any discount from Unlock or the OnKeyPurchase hook.
-   */
-  function purchasePriceFor(
-    address _recipient,
-    address _referrer,
-    bytes calldata _data
-  ) external view returns (uint);
-
-  /**
-   * Allow a Lock manager to change the transfer fee.
-   * @dev Throws if called by other than a Lock manager
-   * @param _transferFeeBasisPoints The new transfer fee in basis-points(bps).
-   * Ex: 200 bps = 2%
-   */
-  function updateTransferFee(uint _transferFeeBasisPoints) external;
-
-  /**
-   * Determines how much of a fee a key owner would need to pay in order to
-   * transfer the key to another account.  This is pro-rated so the fee goes down
-   * overtime.
-   * @dev Throws if _keyOwner does not have a valid key
-   * @param _keyOwner The owner of the key check the transfer fee for.
-   * @param _time The amount of time to calculate the fee for.
-   * @return The transfer fee in seconds.
-   */
-  function getTransferFee(
-    address _keyOwner,
-    uint _time
-  ) external view returns (uint);
-
-  /**
-   * @dev Invoked by a Lock manager to expire the user's key and perform a refund and cancellation of the key
-   * @param _keyOwner The key owner to whom we wish to send a refund to
-   * @param amount The amount to refund the key-owner
-   * @dev Throws if called by other than a Lock manager
-   * @dev Throws if _keyOwner does not have a valid key
-   */
-  function expireAndRefundFor(address _keyOwner, uint amount) external;
-
-  /**
-   * @dev allows the key manager to expire a given tokenId
-   * and send a refund to the keyOwner based on the amount of time remaining.
-   * @param _tokenId The id of the key to cancel.
-   */
-  function cancelAndRefund(uint _tokenId) external;
-
-  /**
-   * @dev Cancels a key managed by a different user and sends the funds to the keyOwner.
-   * @param _keyManager the key managed by this user will be canceled
-   * @param _v _r _s getCancelAndRefundApprovalHash signed by the _keyManager
-   * @param _tokenId The key to cancel
-   */
-  function cancelAndRefundFor(
-    address _keyManager,
-    uint8 _v,
-    bytes32 _r,
-    bytes32 _s,
-    uint _tokenId
-  ) external;
-
-  /**
-   * @notice Sets the minimum nonce for a valid off-chain approval message from the
-   * senders account.
-   * @dev This can be used to invalidate a previously signed message.
-   */
-  function invalidateOffchainApproval(uint _nextAvailableNonce) external;
-
-  /**
-   * Allow a Lock manager to change the refund penalty.
-   * @dev Throws if called by other than a Lock manager
-   * @param _freeTrialLength The new duration of free trials for this lock
-   * @param _refundPenaltyBasisPoints The new refund penaly in basis-points(bps)
-   */
-  function updateRefundPenalty(
-    uint _freeTrialLength,
-    uint _refundPenaltyBasisPoints
-  ) external;
-
-  /**
-   * @dev Determines how much of a refund a key owner would receive if they issued
-   * @param _keyOwner The key owner to get the refund value for.
-   * a cancelAndRefund block.timestamp.
-   * Note that due to the time required to mine a tx, the actual refund amount will be lower
-   * than what the user reads from this call.
-   */
-  function getCancelAndRefundValueFor(
-    address _keyOwner
-  ) external view returns (uint refund);
-
-  function keyManagerToNonce(address) external view returns (uint256);
-
-  /**
-   * @notice returns the hash to sign in order to allow another user to cancel on your behalf.
-   * @dev this can be computed in JS instead of read from the contract.
-   * @param _keyManager The key manager's address (also the message signer)
-   * @param _txSender The address cancelling cancel on behalf of the keyOwner
-   * @return approvalHash The hash to sign
-   */
-  function getCancelAndRefundApprovalHash(
-    address _keyManager,
-    address _txSender
-  ) external view returns (bytes32 approvalHash);
-
-  function addKeyGranter(address account) external;
-
-  function addLockManager(address account) external;
-
-  function isKeyGranter(address account) external view returns (bool);
-
-  function isLockManager(address account) external view returns (bool);
-
-  function onKeyPurchaseHook() external view returns (address);
-
-  function onKeyCancelHook() external view returns (address);
-
-  function revokeKeyGranter(address _granter) external;
-
-  function renounceLockManager() external;
-
-  ///===================================================================
-  /// Auto-generated getter functions from public state variables
-
-  function beneficiary() external view returns (address);
-
-  function expirationDuration() external view returns (uint256);
-
-  function freeTrialLength() external view returns (uint256);
-
-  function isAlive() external view returns (bool);
-
-  function keyPrice() external view returns (uint256);
-
-  function maxNumberOfKeys() external view returns (uint256);
-
-  function owners(uint256) external view returns (address);
-
-  function refundPenaltyBasisPoints() external view returns (uint256);
-
-  function tokenAddress() external view returns (address);
-
-  function transferFeeBasisPoints() external view returns (uint256);
-
-  function unlockProtocol() external view returns (address);
-
-  function keyManagerOf(uint) external view returns (address);
-
-  ///===================================================================
-
-  /**
-   * @notice Allows the key owner to safely share their key (parent key) by
-   * transferring a portion of the remaining time to a new key (child key).
-   * @dev Throws if key is not valid.
-   * @dev Throws if `_to` is the zero address
-   * @param _to The recipient of the shared key
-   * @param _tokenId the key to share
-   * @param _timeShared The amount of time shared
-   * checks if `_to` is a smart contract (code size > 0). If so, it calls
-   * `onERC721Received` on `_to` and throws if the return value is not
-   * `bytes4(keccak256('onERC721Received(address,address,uint,bytes)'))`.
-   * @dev Emit Transfer event
-   */
-  function shareKey(address _to, uint _tokenId, uint _timeShared) external;
-
-  /**
-   * @notice Update transfer and cancel rights for a given key
-   * @param _tokenId The id of the key to assign rights for
-   * @param _keyManager The address to assign the rights to for the given key
-   */
-  function setKeyManagerOf(uint _tokenId, address _keyManager) external;
-
-  /// @notice A descriptive name for a collection of NFTs in this contract
-  function name() external view returns (string memory _name);
-
-  ///===================================================================
-
-  /// From ERC165.sol
-  function supportsInterface(bytes4 interfaceId) external view returns (bool);
-
-  ///===================================================================
-
-  /// From ERC-721
-  /**
-   * @dev Returns the number of NFTs in `owner`'s account.
-   */
-  function balanceOf(address _owner) external view returns (uint256 balance);
-
-  /**
-   * @dev Returns the owner of the NFT specified by `tokenId`.
-   */
-  function ownerOf(uint256 tokenId) external view returns (address _owner);
-
-  /**
-   * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
-   * another (`to`).
-   *
-   *
-   *
-   * Requirements:
-   * - `from`, `to` cannot be zero.
-   * - `tokenId` must be owned by `from`.
-   * - If the caller is not `from`, it must be have been allowed to move this
-   * NFT by either `approve` or `setApprovalForAll`.
-   */
-  function safeTransferFrom(address from, address to, uint256 tokenId) external;
-
-  /**
-   * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
-   * another (`to`).
-   *
-   * Requirements:
-   * - If the caller is not `from`, it must be approved to move this NFT by
-   * either `approve` or `setApprovalForAll`.
-   */
-  function transferFrom(address from, address to, uint256 tokenId) external;
-
-  function approve(address to, uint256 tokenId) external;
-
-  /**
-   * @notice Get the approved address for a single NFT
-   * @dev Throws if `_tokenId` is not a valid NFT.
-   * @param _tokenId The NFT to find the approved address for
-   * @return operator The approved address for this NFT, or the zero address if there is none
-   */
-  function getApproved(
-    uint256 _tokenId
-  ) external view returns (address operator);
-
-  function setApprovalForAll(address operator, bool _approved) external;
-
-  function isApprovedForAll(
-    address _owner,
-    address operator
-  ) external view returns (bool);
-
-  function safeTransferFrom(
-    address from,
-    address to,
-    uint256 tokenId,
-    bytes calldata data
-  ) external;
-
-  function totalSupply() external view returns (uint256);
-
-  function tokenOfOwnerByIndex(
-    address _owner,
-    uint256 index
-  ) external view returns (uint256 tokenId);
-
-  function tokenByIndex(uint256 index) external view returns (uint256);
-}
diff --git a/packages/contracts/src/contracts/PublicLock/IPublicLockV8.sol b/packages/contracts/src/contracts/PublicLock/IPublicLockV8.sol
deleted file mode 100644
index a19bfa6809c..00000000000
--- a/packages/contracts/src/contracts/PublicLock/IPublicLockV8.sol
+++ /dev/null
@@ -1,485 +0,0 @@
-pragma solidity ^0.5.0;
-
-/**
- * @title The PublicLock Interface
- */
-
-contract IPublicLockV8Sol5 {
-  // See indentationissue description here:
-  // https://github.com/duaraghav8/Ethlint/issues/268
-  // solium-disable indentation
-
-  /// Functions
-
-  function initialize(
-    address _lockCreator,
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys,
-    string calldata _lockName
-  ) external;
-
-  /**
-   * @notice Allow the contract to accept tips in ETH sent directly to the contract.
-   * @dev This is okay to use even if the lock is priced in ERC-20 tokens
-   */
-  function() external payable;
-
-  /**
-   * @dev Never used directly
-   */
-  function initialize() external;
-
-  /**
-   * @notice The version number of the current implementation on this network.
-   * @return The current version number.
-   */
-  function publicLockVersion() public pure returns (uint);
-
-  /**
-   * @notice Gets the current balance of the account provided.
-   * @param _tokenAddress The token type to retrieve the balance of.
-   * @param _account The account to get the balance of.
-   * @return The number of tokens of the given type for the given address, possibly 0.
-   */
-  function getBalance(
-    address _tokenAddress,
-    address _account
-  ) external view returns (uint);
-
-  /**
-   * @notice Used to disable lock before migrating keys and/or destroying contract.
-   * @dev Throws if called by other than a lock manager.
-   * @dev Throws if lock contract has already been disabled.
-   */
-  function disableLock() external;
-
-  /**
-   * @dev Called by a lock manager or beneficiary to withdraw all funds from the lock and send them to the `beneficiary`.
-   * @dev Throws if called by other than a lock manager or beneficiary
-   * @param _tokenAddress specifies the token address to withdraw or 0 for ETH. This is usually
-   * the same as `tokenAddress` in MixinFunds.
-   * @param _amount specifies the max amount to withdraw, which may be reduced when
-   * considering the available balance. Set to 0 or MAX_UINT to withdraw everything.
-   *  -- however be wary of draining funds as it breaks the `cancelAndRefund` and `expireAndRefundFor`
-   * use cases.
-   */
-  function withdraw(address _tokenAddress, uint _amount) external;
-
-  /**
-   * @notice An ERC-20 style approval, allowing the spender to transfer funds directly from this lock.
-   * @param _spender address that can spend tokens belonging to the lock
-   * @param _amount amount of tokens that can be spent by the spender
-   */
-  function approveBeneficiary(
-    address _spender,
-    uint _amount
-  ) external returns (bool);
-
-  /**
-   * A function which lets a Lock manager of the lock to change the price for future purchases.
-   * @dev Throws if called by other than a Lock manager
-   * @dev Throws if lock has been disabled
-   * @dev Throws if _tokenAddress is not a valid token
-   * @param _keyPrice The new price to set for keys
-   * @param _tokenAddress The address of the erc20 token to use for pricing the keys,
-   * or 0 to use ETH
-   */
-  function updateKeyPricing(uint _keyPrice, address _tokenAddress) external;
-
-  /**
-   * A function which lets a Lock manager update the beneficiary account,
-   * which receives funds on withdrawal.
-   * @dev Throws if called by other than a Lock manager or beneficiary
-   * @dev Throws if _beneficiary is address(0)
-   * @param _beneficiary The new address to set as the beneficiary
-   */
-  function updateBeneficiary(address _beneficiary) external;
-
-  /**
-   * Checks if the user has a non-expired key.
-   * @param _user The address of the key owner
-   */
-  function getHasValidKey(address _user) external view returns (bool);
-
-  /**
-   * @notice Find the tokenId for a given user
-   * @return The tokenId of the NFT, else returns 0
-   * @param _account The address of the key owner
-   */
-  function getTokenIdFor(address _account) external view returns (uint);
-
-  /**
-   * A function which returns a subset of the keys for this Lock as an array
-   * @param _page the page of key owners requested when faceted by page size
-   * @param _pageSize the number of Key Owners requested per page
-   * @dev Throws if there are no key owners yet
-   */
-  function getOwnersByPage(
-    uint _page,
-    uint _pageSize
-  ) external view returns (address[] memory);
-
-  /**
-   * Checks if the given address owns the given tokenId.
-   * @param _tokenId The tokenId of the key to check
-   * @param _keyOwner The potential key owners address
-   */
-  function isKeyOwner(
-    uint _tokenId,
-    address _keyOwner
-  ) external view returns (bool);
-
-  /**
-   * @dev Returns the key's ExpirationTimestamp field for a given owner.
-   * @param _keyOwner address of the user for whom we search the key
-   * @dev Returns 0 if the owner has never owned a key for this lock
-   */
-  function keyExpirationTimestampFor(
-    address _keyOwner
-  ) external view returns (uint timestamp);
-
-  /**
-   * Public function which returns the total number of unique owners (both expired
-   * and valid).  This may be larger than totalSupply.
-   */
-  function numberOfOwners() external view returns (uint);
-
-  /**
-   * Allows a Lock manager to assign a descriptive name for this Lock.
-   * @param _lockName The new name for the lock
-   * @dev Throws if called by other than a Lock manager
-   */
-  function updateLockName(string calldata _lockName) external;
-
-  /**
-   * Allows a Lock manager to assign a Symbol for this Lock.
-   * @param _lockSymbol The new Symbol for the lock
-   * @dev Throws if called by other than a Lock manager
-   */
-  function updateLockSymbol(string calldata _lockSymbol) external;
-
-  /**
-   * @dev Gets the token symbol
-   * @return string representing the token symbol
-   */
-  function symbol() external view returns (string memory);
-
-  /**
-   * Allows a Lock manager to update the baseTokenURI for this Lock.
-   * @dev Throws if called by other than a Lock manager
-   * @param _baseTokenURI String representing the base of the URI for this lock.
-   */
-  function setBaseTokenURI(string calldata _baseTokenURI) external;
-
-  /**  @notice A distinct Uniform Resource Identifier (URI) for a given asset.
-   * @dev Throws if `_tokenId` is not a valid NFT. URIs are defined in RFC
-   *  3986. The URI may point to a JSON file that conforms to the "ERC721
-   *  Metadata JSON Schema".
-   * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
-   * @param _tokenId The tokenID we're inquiring about
-   * @return String representing the URI for the requested token
-   */
-  function tokenURI(uint256 _tokenId) external view returns (string memory);
-
-  /**
-   * Allows a Lock manager to add or remove an event hook
-   * @param _onKeyPurchaseHook Hook called when the `purchase` function is called
-   * @param _onKeyCancelHook Hook called when the internal `_cancelAndRefund` function is called
-   */
-  function setEventHooks(
-    address _onKeyPurchaseHook,
-    address _onKeyCancelHook
-  ) external;
-
-  /**
-   * Allows a Lock manager to give a collection of users a key with no charge.
-   * Each key may be assigned a different expiration date.
-   * @dev Throws if called by other than a Lock manager
-   * @param _recipients An array of receiving addresses
-   * @param _expirationTimestamps An array of expiration Timestamps for the keys being granted
-   */
-  function grantKeys(
-    address[] calldata _recipients,
-    uint[] calldata _expirationTimestamps,
-    address[] calldata _keyManagers
-  ) external;
-
-  /**
-   * @dev Purchase function
-   * @param _value the number of tokens to pay for this purchase >= the current keyPrice - any applicable discount
-   * (_value is ignored when using ETH)
-   * @param _recipient address of the recipient of the purchased key
-   * @param _referrer address of the user making the referral
-   * @param _data arbitrary data populated by the front-end which initiated the sale
-   * @dev Throws if lock is disabled. Throws if lock is sold-out. Throws if _recipient == address(0).
-   * @dev Setting _value to keyPrice exactly doubles as a security feature. That way if a Lock manager increases the
-   * price while my transaction is pending I can't be charged more than I expected (only applicable to ERC-20 when more
-   * than keyPrice is approved for spending).
-   */
-  function purchase(
-    uint256 _value,
-    address _recipient,
-    address _referrer,
-    bytes calldata _data
-  ) external payable;
-
-  /**
-   * @notice returns the minimum price paid for a purchase with these params.
-   * @dev this considers any discount from Unlock or the OnKeyPurchase hook.
-   */
-  function purchasePriceFor(
-    address _recipient,
-    address _referrer,
-    bytes calldata _data
-  ) external view returns (uint);
-
-  /**
-   * Allow a Lock manager to change the transfer fee.
-   * @dev Throws if called by other than a Lock manager
-   * @param _transferFeeBasisPoints The new transfer fee in basis-points(bps).
-   * Ex: 200 bps = 2%
-   */
-  function updateTransferFee(uint _transferFeeBasisPoints) external;
-
-  /**
-   * Determines how much of a fee a key owner would need to pay in order to
-   * transfer the key to another account.  This is pro-rated so the fee goes down
-   * overtime.
-   * @dev Throws if _keyOwner does not have a valid key
-   * @param _keyOwner The owner of the key check the transfer fee for.
-   * @param _time The amount of time to calculate the fee for.
-   * @return The transfer fee in seconds.
-   */
-  function getTransferFee(
-    address _keyOwner,
-    uint _time
-  ) external view returns (uint);
-
-  /**
-   * @dev Invoked by a Lock manager to expire the user's key and perform a refund and cancellation of the key
-   * @param _keyOwner The key owner to whom we wish to send a refund to
-   * @param amount The amount to refund the key-owner
-   * @dev Throws if called by other than a Lock manager
-   * @dev Throws if _keyOwner does not have a valid key
-   */
-  function expireAndRefundFor(address _keyOwner, uint amount) external;
-
-  /**
-   * @dev allows the key manager to expire a given tokenId
-   * and send a refund to the keyOwner based on the amount of time remaining.
-   * @param _tokenId The id of the key to cancel.
-   */
-  function cancelAndRefund(uint _tokenId) external;
-
-  /**
-   * @dev Cancels a key managed by a different user and sends the funds to the keyOwner.
-   * @param _keyManager the key managed by this user will be canceled
-   * @param _v _r _s getCancelAndRefundApprovalHash signed by the _keyManager
-   * @param _tokenId The key to cancel
-   */
-  function cancelAndRefundFor(
-    address _keyManager,
-    uint8 _v,
-    bytes32 _r,
-    bytes32 _s,
-    uint _tokenId
-  ) external;
-
-  /**
-   * @notice Sets the minimum nonce for a valid off-chain approval message from the
-   * senders account.
-   * @dev This can be used to invalidate a previously signed message.
-   */
-  function invalidateOffchainApproval(uint _nextAvailableNonce) external;
-
-  /**
-   * Allow a Lock manager to change the refund penalty.
-   * @dev Throws if called by other than a Lock manager
-   * @param _freeTrialLength The new duration of free trials for this lock
-   * @param _refundPenaltyBasisPoints The new refund penaly in basis-points(bps)
-   */
-  function updateRefundPenalty(
-    uint _freeTrialLength,
-    uint _refundPenaltyBasisPoints
-  ) external;
-
-  /**
-   * @dev Determines how much of a refund a key owner would receive if they issued
-   * @param _keyOwner The key owner to get the refund value for.
-   * a cancelAndRefund block.timestamp.
-   * Note that due to the time required to mine a tx, the actual refund amount will be lower
-   * than what the user reads from this call.
-   */
-  function getCancelAndRefundValueFor(
-    address _keyOwner
-  ) external view returns (uint refund);
-
-  function keyManagerToNonce(address) external view returns (uint256);
-
-  /**
-   * @notice returns the hash to sign in order to allow another user to cancel on your behalf.
-   * @dev this can be computed in JS instead of read from the contract.
-   * @param _keyManager The key manager's address (also the message signer)
-   * @param _txSender The address cancelling cancel on behalf of the keyOwner
-   * @return approvalHash The hash to sign
-   */
-  function getCancelAndRefundApprovalHash(
-    address _keyManager,
-    address _txSender
-  ) external view returns (bytes32 approvalHash);
-
-  function addKeyGranter(address account) external;
-
-  function addLockManager(address account) external;
-
-  function isKeyGranter(address account) external view returns (bool);
-
-  function isLockManager(address account) external view returns (bool);
-
-  function onKeyPurchaseHook() external view returns (address);
-
-  function onKeyCancelHook() external view returns (address);
-
-  function revokeKeyGranter(address _granter) external;
-
-  function renounceLockManager() external;
-
-  ///===================================================================
-  /// Auto-generated getter functions from public state variables
-
-  function beneficiary() external view returns (address);
-
-  function expirationDuration() external view returns (uint256);
-
-  function freeTrialLength() external view returns (uint256);
-
-  function isAlive() external view returns (bool);
-
-  function keyPrice() external view returns (uint256);
-
-  function maxNumberOfKeys() external view returns (uint256);
-
-  function owners(uint256) external view returns (address);
-
-  function refundPenaltyBasisPoints() external view returns (uint256);
-
-  function tokenAddress() external view returns (address);
-
-  function transferFeeBasisPoints() external view returns (uint256);
-
-  function unlockProtocol() external view returns (address);
-
-  function keyManagerOf(uint) external view returns (address);
-
-  ///===================================================================
-
-  /**
-   * @notice Allows the key owner to safely share their key (parent key) by
-   * transferring a portion of the remaining time to a new key (child key).
-   * @dev Throws if key is not valid.
-   * @dev Throws if `_to` is the zero address
-   * @param _to The recipient of the shared key
-   * @param _tokenId the key to share
-   * @param _timeShared The amount of time shared
-   * checks if `_to` is a smart contract (code size > 0). If so, it calls
-   * `onERC721Received` on `_to` and throws if the return value is not
-   * `bytes4(keccak256('onERC721Received(address,address,uint,bytes)'))`.
-   * @dev Emit Transfer event
-   */
-  function shareKey(address _to, uint _tokenId, uint _timeShared) external;
-
-  /**
-   * @notice Update transfer and cancel rights for a given key
-   * @param _tokenId The id of the key to assign rights for
-   * @param _keyManager The address to assign the rights to for the given key
-   */
-  function setKeyManagerOf(uint _tokenId, address _keyManager) external;
-
-  /// @notice A descriptive name for a collection of NFTs in this contract
-  function name() external view returns (string memory _name);
-
-  ///===================================================================
-
-  /// From ERC165.sol
-  function supportsInterface(bytes4 interfaceId) external view returns (bool);
-
-  ///===================================================================
-
-  /// From ERC-721
-  /**
-   * @dev Returns the number of NFTs in `owner`'s account.
-   */
-  function balanceOf(address _owner) public view returns (uint256 balance);
-
-  /**
-   * @dev Returns the owner of the NFT specified by `tokenId`.
-   */
-  function ownerOf(uint256 tokenId) public view returns (address _owner);
-
-  /**
-   * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
-   * another (`to`).
-   *
-   *
-   *
-   * Requirements:
-   * - `from`, `to` cannot be zero.
-   * - `tokenId` must be owned by `from`.
-   * - If the caller is not `from`, it must be have been allowed to move this
-   * NFT by either `approve` or `setApprovalForAll`.
-   */
-  function safeTransferFrom(address from, address to, uint256 tokenId) public;
-
-  /**
-   * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
-   * another (`to`).
-   *
-   * Requirements:
-   * - If the caller is not `from`, it must be approved to move this NFT by
-   * either `approve` or `setApprovalForAll`.
-   */
-  function transferFrom(address from, address to, uint256 tokenId) public;
-
-  function approve(address to, uint256 tokenId) public;
-
-  /**
-   * @notice Get the approved address for a single NFT
-   * @dev Throws if `_tokenId` is not a valid NFT.
-   * @param _tokenId The NFT to find the approved address for
-   * @return The approved address for this NFT, or the zero address if there is none
-   */
-  function getApproved(uint256 _tokenId) public view returns (address operator);
-
-  function setApprovalForAll(address operator, bool _approved) public;
-
-  function isApprovedForAll(
-    address _owner,
-    address operator
-  ) public view returns (bool);
-
-  function safeTransferFrom(
-    address from,
-    address to,
-    uint256 tokenId,
-    bytes memory data
-  ) public;
-
-  function totalSupply() public view returns (uint256);
-
-  function tokenOfOwnerByIndex(
-    address _owner,
-    uint256 index
-  ) public view returns (uint256 tokenId);
-
-  function tokenByIndex(uint256 index) public view returns (uint256);
-
-  /**
-   * @notice An ERC-20 style transfer.
-   * @param _value sends a token with _value * expirationDuration (the amount of time remaining on a standard purchase).
-   * @dev The typical use case would be to call this with _value 1, which is on par with calling `transferFrom`. If the user
-   * has more than `expirationDuration` time remaining this may use the `shareKey` function to send some but not all of the token.
-   */
-  function transfer(address _to, uint _value) external returns (bool success);
-}
diff --git a/packages/contracts/src/contracts/PublicLock/IPublicLockV8Sol6.sol b/packages/contracts/src/contracts/PublicLock/IPublicLockV8Sol6.sol
deleted file mode 100644
index 9fbe9bdb967..00000000000
--- a/packages/contracts/src/contracts/PublicLock/IPublicLockV8Sol6.sol
+++ /dev/null
@@ -1,487 +0,0 @@
-pragma solidity ^0.6.0;
-
-/**
- * @title The PublicLock Interface
- */
-
-interface IPublicLockV8Sol6 {
-  // See indentationissue description here:
-  // https://github.com/duaraghav8/Ethlint/issues/268
-  // solium-disable indentation
-
-  /// Functions
-
-  function initialize(
-    address _lockCreator,
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys,
-    string calldata _lockName
-  ) external;
-
-  /**
-   * @notice Allow the contract to accept tips in ETH sent directly to the contract.
-   * @dev This is okay to use even if the lock is priced in ERC-20 tokens
-   */
-  receive() external payable;
-
-  /**
-   * @dev Never used directly
-   */
-  function initialize() external;
-
-  /**
-   * @notice The version number of the current implementation on this network.
-   * @return The current version number.
-   */
-  function publicLockVersion() external pure returns (uint);
-
-  /**
-   * @notice Gets the current balance of the account provided.
-   * @param _tokenAddress The token type to retrieve the balance of.
-   * @param _account The account to get the balance of.
-   * @return The number of tokens of the given type for the given address, possibly 0.
-   */
-  function getBalance(
-    address _tokenAddress,
-    address _account
-  ) external view returns (uint);
-
-  /**
-   * @notice Used to disable lock before migrating keys and/or destroying contract.
-   * @dev Throws if called by other than a lock manager.
-   * @dev Throws if lock contract has already been disabled.
-   */
-  function disableLock() external;
-
-  /**
-   * @dev Called by a lock manager or beneficiary to withdraw all funds from the lock and send them to the `beneficiary`.
-   * @dev Throws if called by other than a lock manager or beneficiary
-   * @param _tokenAddress specifies the token address to withdraw or 0 for ETH. This is usually
-   * the same as `tokenAddress` in MixinFunds.
-   * @param _amount specifies the max amount to withdraw, which may be reduced when
-   * considering the available balance. Set to 0 or MAX_UINT to withdraw everything.
-   *  -- however be wary of draining funds as it breaks the `cancelAndRefund` and `expireAndRefundFor`
-   * use cases.
-   */
-  function withdraw(address _tokenAddress, uint _amount) external;
-
-  /**
-   * @notice An ERC-20 style approval, allowing the spender to transfer funds directly from this lock.
-   * @param _spender address that can spend tokens belonging to the lock
-   * @param _amount amount of tokens that can be spent by the spender
-   */
-  function approveBeneficiary(
-    address _spender,
-    uint _amount
-  ) external returns (bool);
-
-  /**
-   * A function which lets a Lock manager of the lock to change the price for future purchases.
-   * @dev Throws if called by other than a Lock manager
-   * @dev Throws if lock has been disabled
-   * @dev Throws if _tokenAddress is not a valid token
-   * @param _keyPrice The new price to set for keys
-   * @param _tokenAddress The address of the erc20 token to use for pricing the keys,
-   * or 0 to use ETH
-   */
-  function updateKeyPricing(uint _keyPrice, address _tokenAddress) external;
-
-  /**
-   * A function which lets a Lock manager update the beneficiary account,
-   * which receives funds on withdrawal.
-   * @dev Throws if called by other than a Lock manager or beneficiary
-   * @dev Throws if _beneficiary is address(0)
-   * @param _beneficiary The new address to set as the beneficiary
-   */
-  function updateBeneficiary(address _beneficiary) external;
-
-  /**
-   * Checks if the user has a non-expired key.
-   * @param _user The address of the key owner
-   */
-  function getHasValidKey(address _user) external view returns (bool);
-
-  /**
-   * @notice Find the tokenId for a given user
-   * @return The tokenId of the NFT, else returns 0
-   * @param _account The address of the key owner
-   */
-  function getTokenIdFor(address _account) external view returns (uint);
-
-  /**
-   * A function which returns a subset of the keys for this Lock as an array
-   * @param _page the page of key owners requested when faceted by page size
-   * @param _pageSize the number of Key Owners requested per page
-   * @dev Throws if there are no key owners yet
-   */
-  function getOwnersByPage(
-    uint _page,
-    uint _pageSize
-  ) external view returns (address[] memory);
-
-  /**
-   * Checks if the given address owns the given tokenId.
-   * @param _tokenId The tokenId of the key to check
-   * @param _keyOwner The potential key owners address
-   */
-  function isKeyOwner(
-    uint _tokenId,
-    address _keyOwner
-  ) external view returns (bool);
-
-  /**
-   * @dev Returns the key's ExpirationTimestamp field for a given owner.
-   * @param _keyOwner address of the user for whom we search the key
-   * @dev Returns 0 if the owner has never owned a key for this lock
-   */
-  function keyExpirationTimestampFor(
-    address _keyOwner
-  ) external view returns (uint timestamp);
-
-  /**
-   * Public function which returns the total number of unique owners (both expired
-   * and valid).  This may be larger than totalSupply.
-   */
-  function numberOfOwners() external view returns (uint);
-
-  /**
-   * Allows a Lock manager to assign a descriptive name for this Lock.
-   * @param _lockName The new name for the lock
-   * @dev Throws if called by other than a Lock manager
-   */
-  function updateLockName(string calldata _lockName) external;
-
-  /**
-   * Allows a Lock manager to assign a Symbol for this Lock.
-   * @param _lockSymbol The new Symbol for the lock
-   * @dev Throws if called by other than a Lock manager
-   */
-  function updateLockSymbol(string calldata _lockSymbol) external;
-
-  /**
-   * @dev Gets the token symbol
-   * @return string representing the token symbol
-   */
-  function symbol() external view returns (string memory);
-
-  /**
-   * Allows a Lock manager to update the baseTokenURI for this Lock.
-   * @dev Throws if called by other than a Lock manager
-   * @param _baseTokenURI String representing the base of the URI for this lock.
-   */
-  function setBaseTokenURI(string calldata _baseTokenURI) external;
-
-  /**  @notice A distinct Uniform Resource Identifier (URI) for a given asset.
-   * @dev Throws if `_tokenId` is not a valid NFT. URIs are defined in RFC
-   *  3986. The URI may point to a JSON file that conforms to the "ERC721
-   *  Metadata JSON Schema".
-   * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
-   * @param _tokenId The tokenID we're inquiring about
-   * @return String representing the URI for the requested token
-   */
-  function tokenURI(uint256 _tokenId) external view returns (string memory);
-
-  /**
-   * Allows a Lock manager to add or remove an event hook
-   * @param _onKeyPurchaseHook Hook called when the `purchase` function is called
-   * @param _onKeyCancelHook Hook called when the internal `_cancelAndRefund` function is called
-   */
-  function setEventHooks(
-    address _onKeyPurchaseHook,
-    address _onKeyCancelHook
-  ) external;
-
-  /**
-   * Allows a Lock manager to give a collection of users a key with no charge.
-   * Each key may be assigned a different expiration date.
-   * @dev Throws if called by other than a Lock manager
-   * @param _recipients An array of receiving addresses
-   * @param _expirationTimestamps An array of expiration Timestamps for the keys being granted
-   */
-  function grantKeys(
-    address[] calldata _recipients,
-    uint[] calldata _expirationTimestamps,
-    address[] calldata _keyManagers
-  ) external;
-
-  /**
-   * @dev Purchase function
-   * @param _value the number of tokens to pay for this purchase >= the current keyPrice - any applicable discount
-   * (_value is ignored when using ETH)
-   * @param _recipient address of the recipient of the purchased key
-   * @param _referrer address of the user making the referral
-   * @param _data arbitrary data populated by the front-end which initiated the sale
-   * @dev Throws if lock is disabled. Throws if lock is sold-out. Throws if _recipient == address(0).
-   * @dev Setting _value to keyPrice exactly doubles as a security feature. That way if a Lock manager increases the
-   * price while my transaction is pending I can't be charged more than I expected (only applicable to ERC-20 when more
-   * than keyPrice is approved for spending).
-   */
-  function purchase(
-    uint256 _value,
-    address _recipient,
-    address _referrer,
-    bytes calldata _data
-  ) external payable;
-
-  /**
-   * @notice returns the minimum price paid for a purchase with these params.
-   * @dev this considers any discount from Unlock or the OnKeyPurchase hook.
-   */
-  function purchasePriceFor(
-    address _recipient,
-    address _referrer,
-    bytes calldata _data
-  ) external view returns (uint);
-
-  /**
-   * Allow a Lock manager to change the transfer fee.
-   * @dev Throws if called by other than a Lock manager
-   * @param _transferFeeBasisPoints The new transfer fee in basis-points(bps).
-   * Ex: 200 bps = 2%
-   */
-  function updateTransferFee(uint _transferFeeBasisPoints) external;
-
-  /**
-   * Determines how much of a fee a key owner would need to pay in order to
-   * transfer the key to another account.  This is pro-rated so the fee goes down
-   * overtime.
-   * @dev Throws if _keyOwner does not have a valid key
-   * @param _keyOwner The owner of the key check the transfer fee for.
-   * @param _time The amount of time to calculate the fee for.
-   * @return The transfer fee in seconds.
-   */
-  function getTransferFee(
-    address _keyOwner,
-    uint _time
-  ) external view returns (uint);
-
-  /**
-   * @dev Invoked by a Lock manager to expire the user's key and perform a refund and cancellation of the key
-   * @param _keyOwner The key owner to whom we wish to send a refund to
-   * @param amount The amount to refund the key-owner
-   * @dev Throws if called by other than a Lock manager
-   * @dev Throws if _keyOwner does not have a valid key
-   */
-  function expireAndRefundFor(address _keyOwner, uint amount) external;
-
-  /**
-   * @dev allows the key manager to expire a given tokenId
-   * and send a refund to the keyOwner based on the amount of time remaining.
-   * @param _tokenId The id of the key to cancel.
-   */
-  function cancelAndRefund(uint _tokenId) external;
-
-  /**
-   * @dev Cancels a key managed by a different user and sends the funds to the keyOwner.
-   * @param _keyManager the key managed by this user will be canceled
-   * @param _v _r _s getCancelAndRefundApprovalHash signed by the _keyManager
-   * @param _tokenId The key to cancel
-   */
-  function cancelAndRefundFor(
-    address _keyManager,
-    uint8 _v,
-    bytes32 _r,
-    bytes32 _s,
-    uint _tokenId
-  ) external;
-
-  /**
-   * @notice Sets the minimum nonce for a valid off-chain approval message from the
-   * senders account.
-   * @dev This can be used to invalidate a previously signed message.
-   */
-  function invalidateOffchainApproval(uint _nextAvailableNonce) external;
-
-  /**
-   * Allow a Lock manager to change the refund penalty.
-   * @dev Throws if called by other than a Lock manager
-   * @param _freeTrialLength The new duration of free trials for this lock
-   * @param _refundPenaltyBasisPoints The new refund penaly in basis-points(bps)
-   */
-  function updateRefundPenalty(
-    uint _freeTrialLength,
-    uint _refundPenaltyBasisPoints
-  ) external;
-
-  /**
-   * @dev Determines how much of a refund a key owner would receive if they issued
-   * @param _keyOwner The key owner to get the refund value for.
-   * a cancelAndRefund block.timestamp.
-   * Note that due to the time required to mine a tx, the actual refund amount will be lower
-   * than what the user reads from this call.
-   */
-  function getCancelAndRefundValueFor(
-    address _keyOwner
-  ) external view returns (uint refund);
-
-  function keyManagerToNonce(address) external view returns (uint256);
-
-  /**
-   * @notice returns the hash to sign in order to allow another user to cancel on your behalf.
-   * @dev this can be computed in JS instead of read from the contract.
-   * @param _keyManager The key manager's address (also the message signer)
-   * @param _txSender The address cancelling cancel on behalf of the keyOwner
-   * @return approvalHash The hash to sign
-   */
-  function getCancelAndRefundApprovalHash(
-    address _keyManager,
-    address _txSender
-  ) external view returns (bytes32 approvalHash);
-
-  function addKeyGranter(address account) external;
-
-  function addLockManager(address account) external;
-
-  function isKeyGranter(address account) external view returns (bool);
-
-  function isLockManager(address account) external view returns (bool);
-
-  function onKeyPurchaseHook() external view returns (address);
-
-  function onKeyCancelHook() external view returns (address);
-
-  function revokeKeyGranter(address _granter) external;
-
-  function renounceLockManager() external;
-
-  ///===================================================================
-  /// Auto-generated getter functions from public state variables
-
-  function beneficiary() external view returns (address);
-
-  function expirationDuration() external view returns (uint256);
-
-  function freeTrialLength() external view returns (uint256);
-
-  function isAlive() external view returns (bool);
-
-  function keyPrice() external view returns (uint256);
-
-  function maxNumberOfKeys() external view returns (uint256);
-
-  function owners(uint256) external view returns (address);
-
-  function refundPenaltyBasisPoints() external view returns (uint256);
-
-  function tokenAddress() external view returns (address);
-
-  function transferFeeBasisPoints() external view returns (uint256);
-
-  function unlockProtocol() external view returns (address);
-
-  function keyManagerOf(uint) external view returns (address);
-
-  ///===================================================================
-
-  /**
-   * @notice Allows the key owner to safely share their key (parent key) by
-   * transferring a portion of the remaining time to a new key (child key).
-   * @dev Throws if key is not valid.
-   * @dev Throws if `_to` is the zero address
-   * @param _to The recipient of the shared key
-   * @param _tokenId the key to share
-   * @param _timeShared The amount of time shared
-   * checks if `_to` is a smart contract (code size > 0). If so, it calls
-   * `onERC721Received` on `_to` and throws if the return value is not
-   * `bytes4(keccak256('onERC721Received(address,address,uint,bytes)'))`.
-   * @dev Emit Transfer event
-   */
-  function shareKey(address _to, uint _tokenId, uint _timeShared) external;
-
-  /**
-   * @notice Update transfer and cancel rights for a given key
-   * @param _tokenId The id of the key to assign rights for
-   * @param _keyManager The address to assign the rights to for the given key
-   */
-  function setKeyManagerOf(uint _tokenId, address _keyManager) external;
-
-  /// @notice A descriptive name for a collection of NFTs in this contract
-  function name() external view returns (string memory _name);
-
-  ///===================================================================
-
-  /// From ERC165.sol
-  function supportsInterface(bytes4 interfaceId) external view returns (bool);
-
-  ///===================================================================
-
-  /// From ERC-721
-  /**
-   * @dev Returns the number of NFTs in `owner`'s account.
-   */
-  function balanceOf(address _owner) external view returns (uint256 balance);
-
-  /**
-   * @dev Returns the owner of the NFT specified by `tokenId`.
-   */
-  function ownerOf(uint256 tokenId) external view returns (address _owner);
-
-  /**
-   * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
-   * another (`to`).
-   *
-   *
-   *
-   * Requirements:
-   * - `from`, `to` cannot be zero.
-   * - `tokenId` must be owned by `from`.
-   * - If the caller is not `from`, it must be have been allowed to move this
-   * NFT by either `approve` or `setApprovalForAll`.
-   */
-  function safeTransferFrom(address from, address to, uint256 tokenId) external;
-
-  /**
-   * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
-   * another (`to`).
-   *
-   * Requirements:
-   * - If the caller is not `from`, it must be approved to move this NFT by
-   * either `approve` or `setApprovalForAll`.
-   */
-  function transferFrom(address from, address to, uint256 tokenId) external;
-
-  function approve(address to, uint256 tokenId) external;
-
-  /**
-   * @notice Get the approved address for a single NFT
-   * @dev Throws if `_tokenId` is not a valid NFT.
-   * @param _tokenId The NFT to find the approved address for
-   * @return operator The approved address for this NFT, or the zero address if there is none
-   */
-  function getApproved(
-    uint256 _tokenId
-  ) external view returns (address operator);
-
-  function setApprovalForAll(address operator, bool _approved) external;
-
-  function isApprovedForAll(
-    address _owner,
-    address operator
-  ) external view returns (bool);
-
-  function safeTransferFrom(
-    address from,
-    address to,
-    uint256 tokenId,
-    bytes memory data
-  ) external;
-
-  function totalSupply() external view returns (uint256);
-
-  function tokenOfOwnerByIndex(
-    address _owner,
-    uint256 index
-  ) external view returns (uint256 tokenId);
-
-  function tokenByIndex(uint256 index) external view returns (uint256);
-
-  /**
-   * @notice An ERC-20 style transfer.
-   * @param _value sends a token with _value * expirationDuration (the amount of time remaining on a standard purchase).
-   * @dev The typical use case would be to call this with _value 1, which is on par with calling `transferFrom`. If the user
-   * has more than `expirationDuration` time remaining this may use the `shareKey` function to send some but not all of the token.
-   */
-  function transfer(address _to, uint _value) external returns (bool success);
-}
diff --git a/packages/contracts/src/contracts/PublicLock/IPublicLockV8sol8.sol b/packages/contracts/src/contracts/PublicLock/IPublicLockV8sol8.sol
deleted file mode 100644
index e8b21f19045..00000000000
--- a/packages/contracts/src/contracts/PublicLock/IPublicLockV8sol8.sol
+++ /dev/null
@@ -1,439 +0,0 @@
-// SPDX-License-Identifier: MIT
-
-pragma solidity >=0.5.17 <0.9.0;
-
-/**
- * @title The PublicLock Interface
- */
-
-interface IPublicLockV8 {
-  // See indentationissue description here:
-  // https://github.com/duaraghav8/Ethlint/issues/268
-  // solium-disable indentation
-
-  /// Functions
-  function initialize(
-    address _lockCreator,
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys,
-    string calldata _lockName
-  ) external;
-
-  // roles
-  function DEFAULT_ADMIN_ROLE() external pure returns (bytes32 role);
-
-  function KEY_GRANTER_ROLE() external pure returns (bytes32 role);
-
-  function LOCK_MANAGER_ROLE() external pure returns (bytes32 role);
-
-  /**
-   * @notice The version number of the current implementation on this network.
-   * @return The current version number.
-   */
-  function publicLockVersion() external pure returns (uint);
-
-  /**
-   * @notice Used to disable lock before migrating keys and/or destroying contract.
-   * @dev Throws if called by other than a lock manager.
-   * @dev Throws if lock contract has already been disabled.
-   */
-  function disableLock() external;
-
-  /**
-   * @dev Called by a lock manager or beneficiary to withdraw all funds from the lock and send them to the `beneficiary`.
-   * @dev Throws if called by other than a lock manager or beneficiary
-   * @param _tokenAddress specifies the token address to withdraw or 0 for ETH. This is usually
-   * the same as `tokenAddress` in MixinFunds.
-   * @param _amount specifies the max amount to withdraw, which may be reduced when
-   * considering the available balance. Set to 0 or MAX_UINT to withdraw everything.
-   *  -- however be wary of draining funds as it breaks the `cancelAndRefund` and `expireAndRefundFor`
-   * use cases.
-   */
-  function withdraw(address _tokenAddress, uint _amount) external;
-
-  /**
-   * @notice An ERC-20 style approval, allowing the spender to transfer funds directly from this lock.
-   * @param _spender address that can spend tokens belonging to the lock
-   * @param _amount amount of tokens that can be spent by the spender
-   */
-  function approveBeneficiary(
-    address _spender,
-    uint _amount
-  ) external returns (bool);
-
-  /**
-   * A function which lets a Lock manager of the lock to change the price for future purchases.
-   * @dev Throws if called by other than a Lock manager
-   * @dev Throws if lock has been disabled
-   * @dev Throws if _tokenAddress is not a valid token
-   * @param _keyPrice The new price to set for keys
-   * @param _tokenAddress The address of the erc20 token to use for pricing the keys,
-   * or 0 to use ETH
-   */
-  function updateKeyPricing(uint _keyPrice, address _tokenAddress) external;
-
-  /**
-   * A function which lets a Lock manager update the beneficiary account,
-   * which receives funds on withdrawal.
-   * @dev Throws if called by other than a Lock manager or beneficiary
-   * @dev Throws if _beneficiary is address(0)
-   * @param _beneficiary The new address to set as the beneficiary
-   */
-  function updateBeneficiary(address _beneficiary) external;
-
-  /**
-   * Checks if the user has a non-expired key.
-   * @param _user The address of the key owner
-   */
-  function getHasValidKey(address _user) external view returns (bool);
-
-  /**
-   * @notice Find the tokenId for a given user
-   * @return The tokenId of the NFT, else returns 0
-   * @param _account The address of the key owner
-   */
-  function getTokenIdFor(address _account) external view returns (uint);
-
-  /**
-   * @dev Returns the key's ExpirationTimestamp field for a given owner.
-   * @param _keyOwner address of the user for whom we search the key
-   * @dev Returns 0 if the owner has never owned a key for this lock
-   */
-  function keyExpirationTimestampFor(
-    address _keyOwner
-  ) external view returns (uint timestamp);
-
-  /**
-   * Public function which returns the total number of unique owners (both expired
-   * and valid).  This may be larger than totalSupply.
-   */
-  function numberOfOwners() external view returns (uint);
-
-  /**
-   * Allows a Lock manager to assign a descriptive name for this Lock.
-   * @param _lockName The new name for the lock
-   * @dev Throws if called by other than a Lock manager
-   */
-  function updateLockName(string calldata _lockName) external;
-
-  /**
-   * Allows a Lock manager to assign a Symbol for this Lock.
-   * @param _lockSymbol The new Symbol for the lock
-   * @dev Throws if called by other than a Lock manager
-   */
-  function updateLockSymbol(string calldata _lockSymbol) external;
-
-  /**
-   * @dev Gets the token symbol
-   * @return string representing the token symbol
-   */
-  function symbol() external view returns (string memory);
-
-  /**
-   * Allows a Lock manager to update the baseTokenURI for this Lock.
-   * @dev Throws if called by other than a Lock manager
-   * @param _baseTokenURI String representing the base of the URI for this lock.
-   */
-  function setBaseTokenURI(string calldata _baseTokenURI) external;
-
-  /**  @notice A distinct Uniform Resource Identifier (URI) for a given asset.
-   * @dev Throws if `_tokenId` is not a valid NFT. URIs are defined in RFC
-   *  3986. The URI may point to a JSON file that conforms to the "ERC721
-   *  Metadata JSON Schema".
-   * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
-   * @param _tokenId The tokenID we're inquiring about
-   * @return String representing the URI for the requested token
-   */
-  function tokenURI(uint256 _tokenId) external view returns (string memory);
-
-  /**
-   * Allows a Lock manager to add or remove an event hook
-   * @param _onKeyPurchaseHook Hook called when the `purchase` function is called
-   * @param _onKeyCancelHook Hook called when the internal `_cancelAndRefund` function is called
-   */
-  function setEventHooks(
-    address _onKeyPurchaseHook,
-    address _onKeyCancelHook
-  ) external;
-
-  /**
-   * Allows a Lock manager to give a collection of users a key with no charge.
-   * Each key may be assigned a different expiration date.
-   * @dev Throws if called by other than a Lock manager
-   * @param _recipients An array of receiving addresses
-   * @param _expirationTimestamps An array of expiration Timestamps for the keys being granted
-   */
-  function grantKeys(
-    address[] calldata _recipients,
-    uint[] calldata _expirationTimestamps,
-    address[] calldata _keyManagers
-  ) external;
-
-  /**
-   * @dev Purchase function
-   * @param _value the number of tokens to pay for this purchase >= the current keyPrice - any applicable discount
-   * (_value is ignored when using ETH)
-   * @param _recipient address of the recipient of the purchased key
-   * @param _referrer address of the user making the referral
-   * @param _data arbitrary data populated by the front-end which initiated the sale
-   * @dev Throws if lock is disabled. Throws if lock is sold-out. Throws if _recipient == address(0).
-   * @dev Setting _value to keyPrice exactly doubles as a security feature. That way if a Lock manager increases the
-   * price while my transaction is pending I can't be charged more than I expected (only applicable to ERC-20 when more
-   * than keyPrice is approved for spending).
-   */
-  function purchase(
-    uint256 _value,
-    address _recipient,
-    address _referrer,
-    bytes calldata _data
-  ) external payable;
-
-  /**
-   * @notice returns the minimum price paid for a purchase with these params.
-   * @dev this considers any discount from Unlock or the OnKeyPurchase hook.
-   */
-  function purchasePriceFor(
-    address _recipient,
-    address _referrer,
-    bytes calldata _data
-  ) external view returns (uint);
-
-  /**
-   * Allow a Lock manager to change the transfer fee.
-   * @dev Throws if called by other than a Lock manager
-   * @param _transferFeeBasisPoints The new transfer fee in basis-points(bps).
-   * Ex: 200 bps = 2%
-   */
-  function updateTransferFee(uint _transferFeeBasisPoints) external;
-
-  /**
-   * Determines how much of a fee a key owner would need to pay in order to
-   * transfer the key to another account.  This is pro-rated so the fee goes down
-   * overtime.
-   * @dev Throws if _keyOwner does not have a valid key
-   * @param _keyOwner The owner of the key check the transfer fee for.
-   * @param _time The amount of time to calculate the fee for.
-   * @return The transfer fee in seconds.
-   */
-  function getTransferFee(
-    address _keyOwner,
-    uint _time
-  ) external view returns (uint);
-
-  /**
-   * @dev Invoked by a Lock manager to expire the user's key and perform a refund and cancellation of the key
-   * @param _keyOwner The key owner to whom we wish to send a refund to
-   * @param amount The amount to refund the key-owner
-   * @dev Throws if called by other than a Lock manager
-   * @dev Throws if _keyOwner does not have a valid key
-   */
-  function expireAndRefundFor(address _keyOwner, uint amount) external;
-
-  /**
-   * @dev allows the key manager to expire a given tokenId
-   * and send a refund to the keyOwner based on the amount of time remaining.
-   * @param _tokenId The id of the key to cancel.
-   */
-  function cancelAndRefund(uint _tokenId) external;
-
-  /**
-   * Allow a Lock manager to change the refund penalty.
-   * @dev Throws if called by other than a Lock manager
-   * @param _freeTrialLength The new duration of free trials for this lock
-   * @param _refundPenaltyBasisPoints The new refund penaly in basis-points(bps)
-   */
-  function updateRefundPenalty(
-    uint _freeTrialLength,
-    uint _refundPenaltyBasisPoints
-  ) external;
-
-  /**
-   * A function which returns a subset of the keys for this Lock as an array
-   * @param _page the page of key owners requested when faceted by page size
-   * @param _pageSize the number of Key Owners requested per page
-   * @dev Throws if there are no key owners yet
-   */
-  function getOwnersByPage(
-    uint _page,
-    uint _pageSize
-  ) external view returns (address[] memory);
-
-  /**
-   * @dev Determines how much of a refund a key owner would receive if they issued
-   * @param _keyOwner The key owner to get the refund value for.
-   * a cancelAndRefund block.timestamp.
-   * Note that due to the time required to mine a tx, the actual refund amount will be lower
-   * than what the user reads from this call.
-   */
-  function getCancelAndRefundValueFor(
-    address _keyOwner
-  ) external view returns (uint refund);
-
-  function addKeyGranter(address account) external;
-
-  function addLockManager(address account) external;
-
-  function isKeyGranter(address account) external view returns (bool);
-
-  function isLockManager(address account) external view returns (bool);
-
-  function onKeyPurchaseHook() external view returns (address);
-
-  function onKeyCancelHook() external view returns (address);
-
-  function revokeKeyGranter(address _granter) external;
-
-  function renounceLockManager() external;
-
-  ///===================================================================
-  /// Auto-generated getter functions from public state variables
-
-  function beneficiary() external view returns (address);
-
-  function expirationDuration() external view returns (uint256);
-
-  function freeTrialLength() external view returns (uint256);
-
-  function isAlive() external view returns (bool);
-
-  function keyPrice() external view returns (uint256);
-
-  function maxNumberOfKeys() external view returns (uint256);
-
-  function owners(uint256) external view returns (address);
-
-  function refundPenaltyBasisPoints() external view returns (uint256);
-
-  function tokenAddress() external view returns (address);
-
-  function transferFeeBasisPoints() external view returns (uint256);
-
-  function unlockProtocol() external view returns (address);
-
-  function keyManagerOf(uint) external view returns (address);
-
-  ///===================================================================
-
-  /**
-   * @notice Allows the key owner to safely share their key (parent key) by
-   * transferring a portion of the remaining time to a new key (child key).
-   * @dev Throws if key is not valid.
-   * @dev Throws if `_to` is the zero address
-   * @param _to The recipient of the shared key
-   * @param _tokenId the key to share
-   * @param _timeShared The amount of time shared
-   * checks if `_to` is a smart contract (code size > 0). If so, it calls
-   * `onERC721Received` on `_to` and throws if the return value is not
-   * `bytes4(keccak256('onERC721Received(address,address,uint,bytes)'))`.
-   * @dev Emit Transfer event
-   */
-  function shareKey(address _to, uint _tokenId, uint _timeShared) external;
-
-  /**
-   * @notice Update transfer and cancel rights for a given key
-   * @param _tokenId The id of the key to assign rights for
-   * @param _keyManager The address to assign the rights to for the given key
-   */
-  function setKeyManagerOf(uint _tokenId, address _keyManager) external;
-
-  /// @notice A descriptive name for a collection of NFTs in this contract
-  function name() external view returns (string memory _name);
-
-  ///===================================================================
-
-  /// From ERC165.sol
-  function supportsInterface(bytes4 interfaceId) external view returns (bool);
-
-  ///===================================================================
-
-  /// From ERC-721
-  /**
-   * @dev Returns the number of NFTs in `owner`'s account.
-   */
-  function balanceOf(address _owner) external view returns (uint256 balance);
-
-  /**
-   * @dev Returns the owner of the NFT specified by `tokenId`.
-   */
-  function ownerOf(uint256 tokenId) external view returns (address _owner);
-
-  /**
-   * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
-   * another (`to`).
-   *
-   * Requirements:
-   * - `from`, `to` cannot be zero.
-   * - `tokenId` must be owned by `from`.
-   * - If the caller is not `from`, it must be have been allowed to move this
-   * NFT by either `approve` or `setApprovalForAll`.
-   */
-  function safeTransferFrom(address from, address to, uint256 tokenId) external;
-
-  /**
-   * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
-   * another (`to`).
-   *
-   * Requirements:
-   * - If the caller is not `from`, it must be approved to move this NFT by
-   * either `approve` or `setApprovalForAll`.
-   */
-  function transferFrom(address from, address to, uint256 tokenId) external;
-
-  function approve(address to, uint256 tokenId) external;
-
-  /**
-   * @notice Get the approved address for a single NFT
-   * @dev Throws if `_tokenId` is not a valid NFT.
-   * @param _tokenId The NFT to find the approved address for
-   * @return operator The approved address for this NFT, or the zero address if there is none
-   */
-  function getApproved(
-    uint256 _tokenId
-  ) external view returns (address operator);
-
-  function setApprovalForAll(address operator, bool _approved) external;
-
-  function isApprovedForAll(
-    address _owner,
-    address operator
-  ) external view returns (bool);
-
-  function safeTransferFrom(
-    address from,
-    address to,
-    uint256 tokenId,
-    bytes calldata data
-  ) external;
-
-  function totalSupply() external view returns (uint256);
-
-  function tokenOfOwnerByIndex(
-    address _owner,
-    uint256 index
-  ) external view returns (uint256 tokenId);
-
-  function tokenByIndex(uint256 index) external view returns (uint256);
-
-  /**
-   * Innherited from Open Zeppelin AccessControl.sol
-   */
-  function getRoleAdmin(bytes32 role) external view returns (bytes32);
-
-  function grantRole(bytes32 role, address account) external;
-
-  function revokeRole(bytes32 role, address account) external;
-
-  function renounceRole(bytes32 role, address account) external;
-
-  function hasRole(bytes32 role, address account) external view returns (bool);
-
-  /**
-   * @notice An ERC-20 style transfer.
-   * @param _value sends a token with _value * expirationDuration (the amount of time remaining on a standard purchase).
-   * @dev The typical use case would be to call this with _value 1, which is on par with calling `transferFrom`. If the user
-   * has more than `expirationDuration` time remaining this may use the `shareKey` function to send some but not all of the token.
-   */
-  function transfer(address _to, uint _value) external returns (bool success);
-}
diff --git a/packages/contracts/src/contracts/Unlock/IUnlockV5.sol b/packages/contracts/src/contracts/Unlock/IUnlockV5.sol
deleted file mode 100644
index ba26443d1a3..00000000000
--- a/packages/contracts/src/contracts/Unlock/IUnlockV5.sol
+++ /dev/null
@@ -1,93 +0,0 @@
-pragma solidity 0.5.12;
-
-/**
- * @title The Unlock Interface
- **/
-
-interface IUnlockV5 {
-  // Events
-  event NewLock(address indexed lockOwner, address indexed newLockAddress);
-
-  event ConfigUnlock(
-    address publicLockAddress,
-    string globalTokenSymbol,
-    string globalTokenURI
-  );
-
-  event ResetTrackedValue(uint grossNetworkProduct, uint totalDiscountGranted);
-
-  // Use initialize instead of a constructor to support proxies (for upgradeability via zos).
-  function initialize(address _owner) external;
-
-  /**
-   * @dev Create lock
-   * This deploys a lock for a creator. It also keeps track of the deployed lock.
-   * @param _tokenAddress set to the ERC20 token address, or 0 for ETH.
-   * @param _salt an identifier for the Lock, which is unique for the user.
-   * This may be implemented as a sequence ID or with RNG. It's used with `create2`
-   * to know the lock's address before the transaction is mined.
-   */
-  function createLock(
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys,
-    string calldata _lockName,
-    bytes12 _salt
-  ) external;
-
-  /**
-   * This function keeps track of the added GDP, as well as grants of discount tokens
-   * to the referrer, if applicable.
-   * The number of discount tokens granted is based on the value of the referal,
-   * the current growth rate and the lock's discount token distribution rate
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordKeyPurchase(
-    uint _value,
-    address _referrer // solhint-disable-line no-unused-vars
-  ) external;
-
-  /**
-   * This function will keep track of consumed discounts by a given user.
-   * It will also grant discount tokens to the creator who is granting the discount based on the
-   * amount of discount and compensation rate.
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordConsumedDiscount(
-    uint _discount,
-    uint _tokens // solhint-disable-line no-unused-vars
-  ) external;
-
-  /**
-   * This function returns the discount available for a user, when purchasing a
-   * a key from a lock.
-   * This does not modify the state. It returns both the discount and the number of tokens
-   * consumed to grant that discount.
-   */
-  function computeAvailableDiscountFor(
-    address _purchaser, // solhint-disable-line no-unused-vars
-    uint _keyPrice // solhint-disable-line no-unused-vars
-  ) external view returns (uint discount, uint tokens);
-
-  // Function to read the globalTokenURI field.
-  function globalBaseTokenURI() external view returns (string memory);
-
-  // Function to read the globalTokenSymbol field.
-  function globalTokenSymbol() external view returns (string memory);
-
-  /** Function for the owner to update configuration variables.
-   *  Should throw if called by other than owner.
-   */
-  function configUnlock(
-    address _publicLockAddress,
-    string calldata _symbol,
-    string calldata _URI
-  ) external;
-
-  // Allows the owner to change the value tracking variables as needed.
-  function resetTrackedValue(
-    uint _grossNetworkProduct,
-    uint _totalDiscountGranted
-  ) external;
-}
diff --git a/packages/contracts/src/contracts/Unlock/IUnlockV6.sol b/packages/contracts/src/contracts/Unlock/IUnlockV6.sol
deleted file mode 100644
index 9d7bd43a480..00000000000
--- a/packages/contracts/src/contracts/Unlock/IUnlockV6.sol
+++ /dev/null
@@ -1,93 +0,0 @@
-pragma solidity ^0.5.0;
-
-/**
- * @title The Unlock Interface
- **/
-
-interface IUnlockV6 {
-  // Events
-  event NewLock(address indexed lockOwner, address indexed newLockAddress);
-
-  event ConfigUnlock(
-    address publicLockAddress,
-    string globalTokenSymbol,
-    string globalTokenURI
-  );
-
-  event ResetTrackedValue(uint grossNetworkProduct, uint totalDiscountGranted);
-
-  // Use initialize instead of a constructor to support proxies (for upgradeability via zos).
-  function initialize(address _owner) external;
-
-  /**
-   * @dev Create lock
-   * This deploys a lock for a creator. It also keeps track of the deployed lock.
-   * @param _tokenAddress set to the ERC20 token address, or 0 for ETH.
-   * @param _salt an identifier for the Lock, which is unique for the user.
-   * This may be implemented as a sequence ID or with RNG. It's used with `create2`
-   * to know the lock's address before the transaction is mined.
-   */
-  function createLock(
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys,
-    string calldata _lockName,
-    bytes12 _salt
-  ) external;
-
-  /**
-   * This function keeps track of the added GDP, as well as grants of discount tokens
-   * to the referrer, if applicable.
-   * The number of discount tokens granted is based on the value of the referal,
-   * the current growth rate and the lock's discount token distribution rate
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordKeyPurchase(
-    uint _value,
-    address _referrer // solhint-disable-line no-unused-vars
-  ) external;
-
-  /**
-   * This function will keep track of consumed discounts by a given user.
-   * It will also grant discount tokens to the creator who is granting the discount based on the
-   * amount of discount and compensation rate.
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordConsumedDiscount(
-    uint _discount,
-    uint _tokens // solhint-disable-line no-unused-vars
-  ) external;
-
-  /**
-   * This function returns the discount available for a user, when purchasing a
-   * a key from a lock.
-   * This does not modify the state. It returns both the discount and the number of tokens
-   * consumed to grant that discount.
-   */
-  function computeAvailableDiscountFor(
-    address _purchaser, // solhint-disable-line no-unused-vars
-    uint _keyPrice // solhint-disable-line no-unused-vars
-  ) external view returns (uint discount, uint tokens);
-
-  // Function to read the globalTokenURI field.
-  function globalBaseTokenURI() external view returns (string memory);
-
-  // Function to read the globalTokenSymbol field.
-  function globalTokenSymbol() external view returns (string memory);
-
-  /** Function for the owner to update configuration variables.
-   *  Should throw if called by other than owner.
-   */
-  function configUnlock(
-    address _publicLockAddress,
-    string calldata _symbol,
-    string calldata _URI
-  ) external;
-
-  // Allows the owner to change the value tracking variables as needed.
-  function resetTrackedValue(
-    uint _grossNetworkProduct,
-    uint _totalDiscountGranted
-  ) external;
-}
diff --git a/packages/contracts/src/contracts/Unlock/IUnlockV7.sol b/packages/contracts/src/contracts/Unlock/IUnlockV7.sol
deleted file mode 100644
index 826df388b05..00000000000
--- a/packages/contracts/src/contracts/Unlock/IUnlockV7.sol
+++ /dev/null
@@ -1,147 +0,0 @@
-pragma solidity >=0.5.0;
-
-/**
- * @title The Unlock Interface
- **/
-
-interface IUnlockV7 {
-  // Use initialize instead of a constructor to support proxies(for upgradeability via zos).
-  function initialize(address _unlockOwner) external;
-
-  /**
-   * @dev Create lock
-   * This deploys a lock for a creator. It also keeps track of the deployed lock.
-   * @param _tokenAddress set to the ERC20 token address, or 0 for ETH.
-   * @param _salt an identifier for the Lock, which is unique for the user.
-   * This may be implemented as a sequence ID or with RNG. It's used with `create2`
-   * to know the lock's address before the transaction is mined.
-   */
-  function createLock(
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys,
-    string calldata _lockName,
-    bytes12 _salt
-  ) external;
-
-  /**
-   * This function keeps track of the added GDP, as well as grants of discount tokens
-   * to the referrer, if applicable.
-   * The number of discount tokens granted is based on the value of the referal,
-   * the current growth rate and the lock's discount token distribution rate
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordKeyPurchase(
-    uint _value,
-    address _referrer // solhint-disable-line no-unused-vars
-  ) external;
-
-  /**
-   * This function will keep track of consumed discounts by a given user.
-   * It will also grant discount tokens to the creator who is granting the discount based on the
-   * amount of discount and compensation rate.
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordConsumedDiscount(
-    uint _discount,
-    uint _tokens // solhint-disable-line no-unused-vars
-  ) external;
-
-  /**
-   * This function returns the discount available for a user, when purchasing a
-   * a key from a lock.
-   * This does not modify the state. It returns both the discount and the number of tokens
-   * consumed to grant that discount.
-   */
-  function computeAvailableDiscountFor(
-    address _purchaser, // solhint-disable-line no-unused-vars
-    uint _keyPrice // solhint-disable-line no-unused-vars
-  ) external view returns (uint discount, uint tokens);
-
-  // Function to read the globalTokenURI field.
-  function globalBaseTokenURI() external view returns (string memory);
-
-  /**
-   * @dev Redundant with globalBaseTokenURI() for backwards compatibility with v3 & v4 locks.
-   */
-  function getGlobalBaseTokenURI() external view returns (string memory);
-
-  // Function to read the globalTokenSymbol field.
-  function globalTokenSymbol() external view returns (string memory);
-
-  /**
-   * @dev Redundant with globalTokenSymbol() for backwards compatibility with v3 & v4 locks.
-   */
-  function getGlobalTokenSymbol() external view returns (string memory);
-
-  /** Function for the owner to update configuration variables.
-   *  Should throw if called by other than owner.
-   */
-  function configUnlock(string calldata _symbol, string calldata _URI) external;
-
-  /**
-   * @notice Upgrade the PublicLock template used for future calls to `createLock`.
-   * @dev This will initialize the template and revokeOwnership.
-   */
-  function setLockTemplate(address payable _publicLockAddress) external;
-
-  // Allows the owner to change the value tracking variables as needed.
-  function resetTrackedValue(
-    uint _grossNetworkProduct,
-    uint _totalDiscountGranted
-  ) external;
-
-  function grossNetworkProduct() external view returns (uint);
-
-  function totalDiscountGranted() external view returns (uint);
-
-  function locks(
-    address
-  )
-    external
-    view
-    returns (bool deployed, uint totalSales, uint yieldedDiscountTokens);
-
-  // The address of the public lock template, used when `createLock` is called
-  function publicLockAddress() external view returns (address);
-
-  // Map token address to exchange contract address if the token is supported
-  // Used for GDP calculations
-  function uniswapExchanges(address) external view returns (address);
-
-  // The version number of the current Unlock implementation on this network
-  function unlockVersion() external pure returns (uint16);
-
-  // allows the owner to set the exchange address to use for value conversions
-  // setting the _exchangeAddress to address(0) removes support for the token
-  function setExchange(
-    address _tokenAddress,
-    address _exchangeAddress
-  ) external;
-
-  /**
-   * @dev Returns true if the caller is the current owner.
-   */
-  function isOwner() external view returns (bool);
-
-  /**
-   * @dev Returns the address of the current owner.
-   */
-  function owner() external view returns (address);
-
-  /**
-   * @dev Leaves the contract without owner. It will not be possible to call
-   * `onlyOwner` functions anymore. Can only be called by the current owner.
-   *
-   * NOTE: Renouncing ownership will leave the contract without an owner,
-   * thereby removing any functionality that is only available to the owner.
-   */
-  function renounceOwnership() external;
-
-  /**
-   * @dev Transfers ownership of the contract to a new account (`newOwner`).
-   * Can only be called by the current owner.
-   */
-  function transferOwnership(address newOwner) external;
-}
diff --git a/packages/contracts/src/contracts/Unlock/IUnlockV8.sol b/packages/contracts/src/contracts/Unlock/IUnlockV8.sol
deleted file mode 100644
index 2f5bc03ae35..00000000000
--- a/packages/contracts/src/contracts/Unlock/IUnlockV8.sol
+++ /dev/null
@@ -1,162 +0,0 @@
-pragma solidity ^0.5.0;
-
-/**
- * @title The Unlock Interface
- **/
-
-interface IUnlockV8 {
-  // Use initialize instead of a constructor to support proxies(for upgradeability via zos).
-  function initialize(address _unlockOwner) external;
-
-  /**
-   * @dev Create lock
-   * This deploys a lock for a creator. It also keeps track of the deployed lock.
-   * @param _tokenAddress set to the ERC20 token address, or 0 for ETH.
-   * @param _salt an identifier for the Lock, which is unique for the user.
-   * This may be implemented as a sequence ID or with RNG. It's used with `create2`
-   * to know the lock's address before the transaction is mined.
-   */
-  function createLock(
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys,
-    string calldata _lockName,
-    bytes12 _salt
-  ) external;
-
-  /**
-   * This function keeps track of the added GDP, as well as grants of discount tokens
-   * to the referrer, if applicable.
-   * The number of discount tokens granted is based on the value of the referal,
-   * the current growth rate and the lock's discount token distribution rate
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordKeyPurchase(
-    uint _value,
-    address _referrer // solhint-disable-line no-unused-vars
-  ) external;
-
-  /**
-   * This function will keep track of consumed discounts by a given user.
-   * It will also grant discount tokens to the creator who is granting the discount based on the
-   * amount of discount and compensation rate.
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordConsumedDiscount(
-    uint _discount,
-    uint _tokens // solhint-disable-line no-unused-vars
-  ) external;
-
-  /**
-   * This function returns the discount available for a user, when purchasing a
-   * a key from a lock.
-   * This does not modify the state. It returns both the discount and the number of tokens
-   * consumed to grant that discount.
-   */
-  function computeAvailableDiscountFor(
-    address _purchaser, // solhint-disable-line no-unused-vars
-    uint _keyPrice // solhint-disable-line no-unused-vars
-  ) external view returns (uint discount, uint tokens);
-
-  // Function to read the globalTokenURI field.
-  function globalBaseTokenURI() external view returns (string memory);
-
-  /**
-   * @dev Redundant with globalBaseTokenURI() for backwards compatibility with v3 & v4 locks.
-   */
-  function getGlobalBaseTokenURI() external view returns (string memory);
-
-  // Function to read the globalTokenSymbol field.
-  function globalTokenSymbol() external view returns (string memory);
-
-  /**
-   * @dev Redundant with globalTokenSymbol() for backwards compatibility with v3 & v4 locks.
-   */
-  function getGlobalTokenSymbol() external view returns (string memory);
-
-  /**
-   * @notice Allows the owner to update configuration variables
-   */
-  function configUnlock(
-    address _udt,
-    address _weth,
-    uint _estimatedGasForPurchase,
-    string calldata _symbol,
-    string calldata _URI
-  ) external;
-
-  /**
-   * @notice Upgrade the PublicLock template used for future calls to `createLock`.
-   * @dev This will initialize the template and revokeOwnership.
-   */
-  function setLockTemplate(address payable _publicLockAddress) external;
-
-  // Allows the owner to change the value tracking variables as needed.
-  function resetTrackedValue(
-    uint _grossNetworkProduct,
-    uint _totalDiscountGranted
-  ) external;
-
-  function grossNetworkProduct() external view returns (uint);
-
-  function totalDiscountGranted() external view returns (uint);
-
-  function locks(
-    address
-  )
-    external
-    view
-    returns (bool deployed, uint totalSales, uint yieldedDiscountTokens);
-
-  // The address of the public lock template, used when `createLock` is called
-  function publicLockAddress() external view returns (address);
-
-  // Map token address to exchange contract address if the token is supported
-  // Used for GDP calculations
-  function uniswapOracles(address) external view returns (address);
-
-  // The WETH token address, used for value calculations
-  function weth() external view returns (address);
-
-  // The UDT token address, used to mint tokens on referral
-  function udt() external view returns (address);
-
-  // The approx amount of gas required to purchase a key
-  function estimatedGasForPurchase() external view returns (uint);
-
-  // The version number of the current Unlock implementation on this network
-  function unlockVersion() external pure returns (uint16);
-
-  /**
-   * @notice allows the owner to set the oracle address to use for value conversions
-   * setting the _oracleAddress to address(0) removes support for the token
-   * @dev This will also call update to ensure at least one datapoint has been recorded.
-   */
-  function setOracle(address _tokenAddress, address _oracleAddress) external;
-
-  /**
-   * @dev Returns true if the caller is the current owner.
-   */
-  function isOwner() external view returns (bool);
-
-  /**
-   * @dev Returns the address of the current owner.
-   */
-  function owner() external view returns (address);
-
-  /**
-   * @dev Leaves the contract without owner. It will not be possible to call
-   * `onlyOwner` functions anymore. Can only be called by the current owner.
-   *
-   * NOTE: Renouncing ownership will leave the contract without an owner,
-   * thereby removing any functionality that is only available to the owner.
-   */
-  function renounceOwnership() external;
-
-  /**
-   * @dev Transfers ownership of the contract to a new account (`newOwner`).
-   * Can only be called by the current owner.
-   */
-  function transferOwnership(address newOwner) external;
-}
diff --git a/packages/contracts/src/contracts/Unlock/UnlockV0.sol b/packages/contracts/src/contracts/Unlock/UnlockV0.sol
deleted file mode 100644
index ac677aecd00..00000000000
--- a/packages/contracts/src/contracts/Unlock/UnlockV0.sol
+++ /dev/null
@@ -1,1255 +0,0 @@
-// Sources flattened with hardhat v2.4.1 https://hardhat.org
-
-// File zos-lib/contracts/Initializable.sol@v2.1.0
-
-pragma solidity >=0.4.24 <0.6.0;
-
-/**
- * @title Initializable
- *
- * @dev Helper contract to support initializer functions. To use it, replace
- * the constructor with a function that has the `initializer` modifier.
- * WARNING: Unlike constructors, initializer functions must be manually
- * invoked. This applies both to deploying an Initializable contract, as well
- * as extending an Initializable contract via inheritance.
- * WARNING: When used with inheritance, manual care must be taken to not invoke
- * a parent initializer twice, or ensure that all initializers are idempotent,
- * because this is not dealt with automatically as with constructors.
- */
-contract Initializable {
-  /**
-   * @dev Indicates that the contract has been initialized.
-   */
-  bool private initialized;
-
-  /**
-   * @dev Indicates that the contract is in the process of being initialized.
-   */
-  bool private initializing;
-
-  /**
-   * @dev Modifier to use in the initializer function of a contract.
-   */
-  modifier initializer() {
-    require(
-      initializing || isConstructor() || !initialized,
-      "Contract instance has already been initialized"
-    );
-
-    bool wasInitializing = initializing;
-    initializing = true;
-    initialized = true;
-
-    _;
-
-    initializing = wasInitializing;
-  }
-
-  /// @dev Returns true if and only if the function is running in the constructor
-  function isConstructor() private view returns (bool) {
-    // extcodesize checks the size of the code stored in an address, and
-    // address returns the current address. Since the code is still not
-    // deployed when running a constructor, any checks on its code size will
-    // yield zero, making it an effective way to detect if a contract is
-    // under construction or not.
-    uint256 cs;
-    assembly {
-      cs := extcodesize(address)
-    }
-    return cs == 0;
-  }
-
-  // Reserved storage space to allow for layout changes in the future.
-  uint256[50] private ______gap;
-}
-
-// File openzeppelin-eth/contracts/ownership/Ownable.sol@v2.0.2
-
-pragma solidity ^0.4.24;
-
-/**
- * @title Ownable
- * @dev The Ownable contract has an owner address, and provides basic authorization control
- * functions, this simplifies the implementation of "user permissions".
- */
-contract Ownable is Initializable {
-  address private _owner;
-
-  event OwnershipRenounced(address indexed previousOwner);
-  event OwnershipTransferred(
-    address indexed previousOwner,
-    address indexed newOwner
-  );
-
-  /**
-   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
-   * account.
-   */
-  function initialize(address sender) public initializer {
-    _owner = sender;
-  }
-
-  /**
-   * @return the address of the owner.
-   */
-  function owner() public view returns (address) {
-    return _owner;
-  }
-
-  /**
-   * @dev Throws if called by any account other than the owner.
-   */
-  modifier onlyOwner() {
-    require(isOwner());
-    _;
-  }
-
-  /**
-   * @return true if `msg.sender` is the owner of the contract.
-   */
-  function isOwner() public view returns (bool) {
-    return msg.sender == _owner;
-  }
-
-  /**
-   * @dev Allows the current owner to relinquish control of the contract.
-   * @notice Renouncing to ownership will leave the contract without an owner.
-   * It will not be possible to call the functions with the `onlyOwner`
-   * modifier anymore.
-   */
-  function renounceOwnership() public onlyOwner {
-    emit OwnershipRenounced(_owner);
-    _owner = address(0);
-  }
-
-  /**
-   * @dev Allows the current owner to transfer control of the contract to a newOwner.
-   * @param newOwner The address to transfer ownership to.
-   */
-  function transferOwnership(address newOwner) public onlyOwner {
-    _transferOwnership(newOwner);
-  }
-
-  /**
-   * @dev Transfers control of the contract to a newOwner.
-   * @param newOwner The address to transfer ownership to.
-   */
-  function _transferOwnership(address newOwner) internal {
-    require(newOwner != address(0));
-    emit OwnershipTransferred(_owner, newOwner);
-    _owner = newOwner;
-  }
-
-  uint256[50] private ______gap;
-}
-
-// File contracts/interfaces/ILockCore.sol
-
-pragma solidity 0.4.25;
-
-/**
- * @title The Lock interface core methods for a Lock
- * @author HardlyDifficult (unlock-protocol.com)
- */
-interface ILockCore {
-  /**
-   * @dev Purchase function, public version, with no referrer.
-   * @param _recipient address of the recipient of the purchased key
-   * @param _data optional marker for the key
-   */
-  function purchaseFor(address _recipient, bytes _data) external payable;
-
-  /**
-   * @dev Purchase function, public version, with referrer.
-   * @param _recipient address of the recipient of the purchased key
-   * @param _referrer address of the user making the referral
-   * @param _data optional marker for the key
-   */
-  function purchaseForFrom(
-    address _recipient,
-    address _referrer,
-    bytes _data
-  ) external payable;
-
-  /**
-   * @dev Called by owner to withdraw all funds from the lock.
-   */
-  function withdraw() external;
-
-  /**
-   * @dev Called by owner to partially withdraw funds from the lock.
-   */
-  function partialWithdraw(uint _amount) external;
-
-  /**
-   * A function which lets the owner of the lock expire a users' key.
-   */
-  function expireKeyFor(address _owner) external;
-
-  /**
-   * A function which lets the owner of the lock to change the price for future purchases.
-   */
-  function updateKeyPrice(uint _keyPrice) external;
-
-  /**
-   * Public function which returns the total number of unique owners (both expired
-   * and valid).  This may be larger than outstandingKeys.
-   */
-  function numberOfOwners() external view returns (uint);
-
-  /**
-   * Public function which returns the total number of keys (both expired and valid)
-   */
-  function outstandingKeys() external view returns (uint);
-
-  /**
-   * @dev Returns the key's data field for a given owner.
-   * @param _owner address of the user for whom we search the key
-   */
-  function keyDataFor(address _owner) external view returns (bytes data);
-
-  /**
-   * @dev Returns the key's ExpirationTimestamp field for a given owner.
-   * @param _owner address of the user for whom we search the key
-   */
-  function keyExpirationTimestampFor(
-    address _owner
-  ) external view returns (uint timestamp);
-
-  /**
-   * @param _page the page of key owners requested when faceted by page size
-   * @param _pageSize the number of Key Owners requested per page
-   */
-  function getOwnersByPage(
-    uint _page,
-    uint _pageSize
-  ) external view returns (address[]);
-}
-
-// File contracts/interfaces/IUnlock.sol
-
-pragma solidity 0.4.25;
-
-/**
- * @title The Unlock Interface
- **/
-
-interface IUnlock {
-  // Events
-  event NewLock(address indexed lockOwner, address indexed newLockAddress);
-
-  // Use initialize instead of a constructor to support proxies (for upgradeability via zos).
-  function initialize(address _owner) external;
-
-  /**
-   * @dev Create lock
-   * This deploys a lock for a creator. It also keeps track of the deployed lock.
-   * Return type `ILockCore` is the most specific interface from which all lock types inherit.
-   */
-  function createLock(
-    uint _expirationDuration,
-    uint _keyPrice,
-    uint _maxNumberOfKeys
-  ) external returns (ILockCore lock);
-
-  /**
-   * This function keeps track of the added GDP, as well as grants of discount tokens
-   * to the referrer, if applicable.
-   * The number of discount tokens granted is based on the value of the referal,
-   * the current growth rate and the lock's discount token distribution rate
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordKeyPurchase(
-    uint _value,
-    address _referrer // solhint-disable-line no-unused-vars
-  ) external;
-
-  /**
-   * This function will keep track of consumed discounts by a given user.
-   * It will also grant discount tokens to the creator who is granting the discount based on the
-   * amount of discount and compensation rate.
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordConsumedDiscount(
-    uint _discount,
-    uint _tokens // solhint-disable-line no-unused-vars
-  ) external;
-
-  /**
-   * This function returns the discount available for a user, when purchasing a
-   * a key from a lock.
-   * This does not modify the state. It returns both the discount and the number of tokens
-   * consumed to grant that discount.
-   */
-  function computeAvailableDiscountFor(
-    address _purchaser, // solhint-disable-line no-unused-vars
-    uint _keyPrice // solhint-disable-line no-unused-vars
-  ) external view returns (uint discount, uint tokens);
-}
-
-// File contracts/interfaces/IERC721.sol
-
-pragma solidity 0.4.25;
-
-/// @title ERC-721 Non-Fungible Token Standard
-/// @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
-///  Note: the ERC-165 identifier for this interface is 0x80ac58cd
-
-interface IERC721 {
-  /// @dev This emits when ownership of any NFT changes by any mechanism.
-  ///  This event emits when NFTs are created (`from` == 0) and destroyed
-  ///  (`to` == 0). Exception: during contract creation, any number of NFTs
-  ///  may be created and assigned without emitting Transfer. At the time of
-  ///  any transfer, the approved address for that NFT (if any) is reset to none.
-  event Transfer(
-    address indexed _from,
-    address indexed _to,
-    uint indexed _tokenId
-  );
-
-  /// @dev This emits when the approved address for an NFT is changed or
-  ///  reaffirmed. The zero address indicates there is no approved address.
-  ///  When a Transfer event emits, this also indicates that the approved
-  ///  address for that NFT (if any) is reset to none.
-  event Approval(
-    address indexed _owner,
-    address indexed _approved,
-    uint indexed _tokenId
-  );
-
-  /// @dev This emits when an operator is enabled or disabled for an owner.
-  ///  The operator can manage all NFTs of the owner.
-  event ApprovalForAll(
-    address indexed _owner,
-    address indexed _operator,
-    bool _approved
-  );
-
-  /// @notice Transfer ownership of an NFT -- THE CALLER IS RESPONSIBLE
-  ///  TO CONFIRM THAT `_to` IS CAPABLE OF RECEIVING NFTS OR ELSE
-  ///  THEY MAY BE PERMANENTLY LOST
-  /// @dev Throws unless `msg.sender` is the current owner, an authorized
-  ///  operator, or the approved address for this NFT. Throws if `_from` is
-  ///  not the current owner. Throws if `_to` is the zero address. Throws if
-  ///  `_tokenId` is not a valid NFT.
-  /// @param _from The current owner of the NFT
-  /// @param _to The new owner
-  /// @param _tokenId The NFT to transfer
-  function transferFrom(
-    address _from,
-    address _to,
-    uint _tokenId
-  ) external payable;
-
-  /// @notice Set or reaffirm the approved address for an NFT
-  /// @dev The zero address indicates there is no approved address.
-  /// @dev Throws unless `msg.sender` is the current NFT owner, or an authorized
-  ///  operator of the current owner.
-  /// @param _approved The new approved NFT controller
-  /// @param _tokenId The NFT to approve
-  function approve(address _approved, uint _tokenId) external payable;
-
-  /// @notice Count all NFTs assigned to an owner
-  /// @dev NFTs assigned to the zero address are considered invalid, and this
-  ///  function throws for queries about the zero address.
-  /// @param _owner An address for whom to query the balance
-  /// @return The number of NFTs owned by `_owner`, possibly zero
-  function balanceOf(address _owner) external view returns (uint);
-
-  /// @notice Find the owner of an NFT
-  /// @dev NFTs assigned to zero address are considered invalid, and queries
-  ///  about them do throw.
-  /// @param _tokenId The identifier for an NFT
-  /// @return The address of the owner of the NFT
-  function ownerOf(uint _tokenId) external view returns (address);
-
-  /// @notice Transfers the ownership of an NFT from one address to another address
-  /// @dev Throws unless `msg.sender` is the current owner, an authorized
-  ///  operator, or the approved address for this NFT. Throws if `_from` is
-  ///  not the current owner. Throws if `_to` is the zero address. Throws if
-  ///  `_tokenId` is not a valid NFT. When transfer is complete, this function
-  ///  checks if `_to` is a smart contract (code size > 0). If so, it calls
-  ///  `onERC721Received` on `_to` and throws if the return value is not
-  ///  `bytes4(keccak256("onERC721Received(address,address,uint,bytes)"))`.
-  /// @param _from The current owner of the NFT
-  /// @param _to The new owner
-  /// @param _tokenId The NFT to transfer
-  /// @param data Additional data with no specified format, sent in call to `_to`
-  // function safeTransferFrom(address _from, address _to, uint _tokenId, bytes data) external payable;
-
-  /// @notice Transfers the ownership of an NFT from one address to another address
-  /// @dev This works identically to the other function with an extra data parameter,
-  ///  except this function just sets data to ""
-  /// @param _from The current owner of the NFT
-  /// @param _to The new owner
-  /// @param _tokenId The NFT to transfer
-  // function safeTransferFrom(address _from, address _to, uint _tokenId) external payable;
-
-  /// @notice Enable or disable approval for a third party ("operator") to manage
-  ///  all of `msg.sender`'s assets.
-  /// @dev Emits the ApprovalForAll event. The contract MUST allow
-  ///  multiple operators per owner.
-  /// @param _operator Address to add to the set of authorized operators.
-  /// @param _approved True if the operator is approved, false to revoke approval
-  // function setApprovalForAll(address _operator, bool _approved) external;
-
-  /// @notice Get the approved address for a single NFT
-  /// @dev Throws if `_tokenId` is not a valid NFT
-  /// @param _tokenId The NFT to find the approved address for
-  /// @return The approved address for this NFT, or the zero address if there is none
-  function getApproved(uint _tokenId) external view returns (address);
-
-  /// @notice Query if an address is an authorized operator for another address
-  /// @param _owner The address that owns the NFTs
-  /// @param _operator The address that acts on behalf of the owner
-  /// @return True if `_operator` is an approved operator for `_owner`, false otherwise
-  // function isApprovedForAll(address _owner, address _operator) external view returns (bool);
-}
-
-// interface ERC721TokenReceiver {
-//     /// @notice Handle the receipt of an NFT
-//     /// @dev The ERC721 smart contract calls this function on the
-//     /// recipient after a `transfer`. This function MAY throw to revert and reject the transfer. Return
-//     /// of other than the magic value MUST result in the transaction being reverted.
-//     /// @notice The contract address is always the message sender.
-//     /// @param _operator The address which called `safeTransferFrom` function
-//     /// @param _from The address which previously owned the token
-//     /// @param _tokenId The NFT identifier which is being transferred
-//     /// @param _data Additional data with no specified format
-//     /// @return `bytes4(keccak256("onERC721Received(address,address,uint,bytes)"))`
-//     /// unless throwing
-// function onERC721Received(
-//   address _operator,
-//   address _from,
-//   uint _tokenId,
-//   bytes _data
-// )
-// external
-// returns(bytes4);
-//  }
-
-// File contracts/interfaces/IERC721Receiver.sol
-
-pragma solidity 0.4.25;
-
-/**
- * @title ERC721 token receiver interface
- * @dev Interface for any contract that wants to support safeTransfers
- * from ERC721 asset contracts.
- */
-interface IERC721Receiver {
-  /**
-   * @notice Handle the receipt of an NFT
-   * @dev The ERC721 smart contract calls this function on the recipient
-   * after a `safeTransfer`. This function MUST return the function selector,
-   * otherwise the caller will revert the transaction. The selector to be
-   * returned can be obtained as `this.onERC721Received.selector`. This
-   * function MAY throw to revert and reject the transfer.
-   * Note: the ERC721 contract address is always the message sender.
-   * @param operator The address which called `safeTransferFrom` function
-   * @param from The address which previously owned the token
-   * @param tokenId The NFT identifier which is being transferred
-   * @param data Additional data with no specified format
-   * @return `bytes4(keccak256("onERC721Received(address,address,uint,bytes)"))`
-   */
-  function onERC721Received(
-    address operator,
-    address from,
-    uint tokenId,
-    bytes data
-  ) public returns (bytes4);
-}
-
-// File openzeppelin-eth/contracts/introspection/IERC165.sol@v2.0.2
-
-pragma solidity ^0.4.24;
-
-/**
- * @title IERC165
- * @dev https://github.com/ethereum/EIPs/blob/master/EIPS/eip-165.md
- */
-interface IERC165 {
-  /**
-   * @notice Query if a contract implements an interface
-   * @param interfaceId The interface identifier, as specified in ERC-165
-   * @dev Interface identification is specified in ERC-165. This function
-   * uses less than 30,000 gas.
-   */
-  function supportsInterface(bytes4 interfaceId) external view returns (bool);
-}
-
-// File openzeppelin-eth/contracts/introspection/ERC165.sol@v2.0.2
-
-pragma solidity ^0.4.24;
-
-/**
- * @title ERC165
- * @author Matt Condon (@shrugs)
- * @dev Implements ERC165 using a lookup table.
- */
-contract ERC165 is Initializable, IERC165 {
-  bytes4 private constant _InterfaceId_ERC165 = 0x01ffc9a7;
-  /**
-   * 0x01ffc9a7 ===
-   *   bytes4(keccak256('supportsInterface(bytes4)'))
-   */
-
-  /**
-   * @dev a mapping of interface id to whether or not it's supported
-   */
-  mapping(bytes4 => bool) internal _supportedInterfaces;
-
-  /**
-   * @dev A contract implementing SupportsInterfaceWithLookup
-   * implement ERC165 itself
-   */
-  function initialize() public initializer {
-    _registerInterface(_InterfaceId_ERC165);
-  }
-
-  /**
-   * @dev implement supportsInterface(bytes4) using a lookup table
-   */
-  function supportsInterface(bytes4 interfaceId) public view returns (bool) {
-    return _supportedInterfaces[interfaceId];
-  }
-
-  /**
-   * @dev private method for registering an interface
-   */
-  function _registerInterface(bytes4 interfaceId) internal {
-    require(interfaceId != 0xffffffff);
-    _supportedInterfaces[interfaceId] = true;
-  }
-
-  uint256[50] private ______gap;
-}
-
-// File openzeppelin-eth/contracts/math/SafeMath.sol@v2.0.2
-
-pragma solidity ^0.4.24;
-
-/**
- * @title SafeMath
- * @dev Math operations with safety checks that revert on error
- */
-library SafeMath {
-  /**
-   * @dev Multiplies two numbers, reverts on overflow.
-   */
-  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
-    // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
-    // benefit is lost if 'b' is also tested.
-    // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
-    if (a == 0) {
-      return 0;
-    }
-
-    uint256 c = a * b;
-    require(c / a == b);
-
-    return c;
-  }
-
-  /**
-   * @dev Integer division of two numbers truncating the quotient, reverts on division by zero.
-   */
-  function div(uint256 a, uint256 b) internal pure returns (uint256) {
-    require(b > 0); // Solidity only automatically asserts when dividing by 0
-    uint256 c = a / b;
-    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
-
-    return c;
-  }
-
-  /**
-   * @dev Subtracts two numbers, reverts on overflow (i.e. if subtrahend is greater than minuend).
-   */
-  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
-    require(b <= a);
-    uint256 c = a - b;
-
-    return c;
-  }
-
-  /**
-   * @dev Adds two numbers, reverts on overflow.
-   */
-  function add(uint256 a, uint256 b) internal pure returns (uint256) {
-    uint256 c = a + b;
-    require(c >= a);
-
-    return c;
-  }
-
-  /**
-   * @dev Divides two numbers and returns the remainder (unsigned integer modulo),
-   * reverts when dividing by zero.
-   */
-  function mod(uint256 a, uint256 b) internal pure returns (uint256) {
-    require(b != 0);
-    return a % b;
-  }
-}
-
-// File contracts/PublicLock.sol
-
-pragma solidity 0.4.25;
-
-/**
- * TODO: consider error codes rather than strings
- */
-
-/**
- * @title The Lock contract
- * @author Julien Genestoux (unlock-protocol.com)
- * Eventually: implement ERC721.
- * @dev ERC165 allows our contract to be queried to determine whether it implements a given interface.
- * Every ERC-721 compliant contract must implement the ERC165 interface.
- * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
- */
-contract PublicLock is ILockCore, ERC165, IERC721, IERC721Receiver, Ownable {
-  using SafeMath for uint;
-
-  // The struct for a key
-  struct Key {
-    uint tokenId;
-    uint expirationTimestamp;
-    bytes data; // Note: This can be expensive?
-  }
-
-  // Events
-  event PriceChanged(uint oldKeyPrice, uint keyPrice);
-
-  event Withdrawal(address indexed _sender, uint _amount);
-
-  // Fields
-  // Unlock Protocol address
-  // TODO: should we make that private/internal?
-  address public unlockProtocol;
-
-  // Duration in seconds for which the keys are valid, after creation
-  // should we take a smaller type use less gas?
-  // TODO: add support for a timestamp instead of duration
-  uint public expirationDuration;
-
-  // price in wei of the next key
-  // TODO: allow support for a keyPriceCalculator which could set prices dynamically
-  uint public keyPrice;
-
-  // Max number of keys sold if the keyReleaseMechanism is public
-  uint public maxNumberOfKeys;
-
-  // A count of how many new key purchases there have been
-  uint public numberOfKeysSold;
-
-  // Keys
-  // Each owner can have at most exactly one key
-  // TODO: could we use public here? (this could be confusing though because it getter will
-  // return 0 values when missing a key)
-  mapping(address => Key) internal keyByOwner;
-
-  // Each tokenId can have at most exactly one owner at a time.
-  // Returns 0 if the token does not exist
-  // TODO: once we decouple tokenId from owner address (incl in js), then we can consider
-  // merging this with numberOfKeysSold into an array instead.
-  mapping(uint => address) internal ownerByTokenId;
-
-  // Addresses of owners are also stored in an array.
-  // Addresses are never removed by design to avoid abuses around referals
-  address[] public owners;
-
-  // Keeping track of approved transfers
-  // This is a mapping of addresses which have approved
-  // the transfer of a key to another address where their key can be transfered
-  // Note: the approver may actually NOT have a key... and there can only
-  // be a single approved beneficiary
-  // Note 2: for transfer, both addresses will be different
-  // Note 3: for sales (new keys on restricted locks), both addresses will be the same
-  mapping(uint => address) internal approved;
-
-  /**
-   * MODIFIERS
-   */
-  // Ensures that an owner has a key
-  modifier hasKey(address _owner) {
-    Key storage key = keyByOwner[_owner];
-    require(key.expirationTimestamp > 0, "No such key");
-    _;
-  }
-
-  // Ensures that an owner has a valid key
-  modifier hasValidKey(address _owner) {
-    Key storage key = keyByOwner[_owner];
-    require(key.expirationTimestamp > now, "Key is not valid");
-    _;
-  }
-
-  // Ensure that the caller owns the key
-  modifier onlyKeyOwner(uint _tokenId) {
-    require(ownerByTokenId[_tokenId] == msg.sender);
-    _;
-  }
-
-  // Ensures that a key has an owner
-  modifier isKey(uint _tokenId) {
-    require(ownerByTokenId[_tokenId] != address(0), "No such key");
-    _;
-  }
-
-  // Ensure that the caller has a key
-  // or that the caller has been approved
-  // for ownership of that key
-  modifier onlyKeyOwnerOrApproved(uint _tokenId) {
-    require(
-      ownerByTokenId[_tokenId] == msg.sender ||
-        _getApproved(_tokenId) == msg.sender,
-      "Only key owner or approved owner"
-    );
-    _;
-  }
-
-  // Ensure that the Lock has not sold all of its keys.
-  modifier notSoldOut() {
-    require(
-      maxNumberOfKeys > numberOfKeysSold,
-      "Maximum number of keys already sold"
-    );
-    _;
-  }
-
-  // Constructor
-  constructor(
-    address _owner,
-    uint _expirationDuration,
-    uint _keyPrice,
-    uint _maxNumberOfKeys
-  ) public {
-    require(
-      _expirationDuration <= 100 * 365 * 24 * 60 * 60,
-      "Expiration duration exceeds 100 years"
-    );
-    unlockProtocol = msg.sender; // Make sure we link back to Unlock's smart contract.
-    Ownable.initialize(_owner);
-    ERC165.initialize();
-    expirationDuration = _expirationDuration;
-    keyPrice = _keyPrice;
-    maxNumberOfKeys = _maxNumberOfKeys;
-  }
-
-  /**
-   * @dev Purchase function, public version, with no referrer.
-   * @param _recipient address of the recipient of the purchased key
-   * @param _data optional marker for the key
-   */
-  function purchaseFor(address _recipient, bytes _data) external payable {
-    return _purchaseFor(_recipient, address(0), _data);
-  }
-
-  /**
-   * @dev Purchase function, public version, with referrer.
-   * @param _recipient address of the recipient of the purchased key
-   * @param _referrer address of the user making the referral
-   * @param _data optional marker for the key
-   */
-  function purchaseForFrom(
-    address _recipient,
-    address _referrer,
-    bytes _data
-  ) external payable hasValidKey(_referrer) {
-    return _purchaseFor(_recipient, _referrer, _data);
-  }
-
-  /**
-   * This is payable because at some point we want to allow the LOCK to capture a fee on 2ndary
-   * market transactions...
-   */
-  function transferFrom(
-    address _from,
-    address _recipient,
-    uint _tokenId
-  )
-    external
-    payable
-    notSoldOut
-    hasValidKey(_from)
-    onlyKeyOwnerOrApproved(_tokenId)
-  {
-    require(_recipient != address(0));
-
-    uint previousExpiration = keyByOwner[_recipient].expirationTimestamp;
-
-    if (previousExpiration == 0) {
-      // The recipient did not have a key previously
-      owners.push(_recipient);
-      // Note: not using the tokenId above since ATM we do not transfer tokenId's
-      // this will change when we decouple tokenId from address
-      ownerByTokenId[uint(_recipient)] = _recipient;
-      // At the moment tokenId is the user's address, but as we work towards ERC721
-      // support this will change to a sequenceId assigned at purchase.
-      keyByOwner[_recipient].tokenId = uint(_recipient);
-    }
-
-    if (previousExpiration <= now) {
-      // The recipient did not have a key, or had a key but it expired. The new expiration is the
-      // sender's key expiration
-      keyByOwner[_recipient].expirationTimestamp = keyByOwner[_from]
-        .expirationTimestamp;
-    } else {
-      // The recipient has a non expired key. We just add them the corresponding remaining time
-      // SafeSub is not required since the if confirms `previousExpiration - now` cannot underflow
-      keyByOwner[_recipient].expirationTimestamp = keyByOwner[_from]
-        .expirationTimestamp
-        .add(previousExpiration - now);
-    }
-    // Overwite data in all cases
-    keyByOwner[_recipient].data = keyByOwner[_from].data;
-
-    // Effectively expiring the key for the previous owner
-    keyByOwner[_from].expirationTimestamp = now;
-
-    // Clear any previous approvals
-    approved[_tokenId] = address(0);
-
-    // trigger event
-    emit Transfer(_from, _recipient, _tokenId);
-  }
-
-  /**
-   * @dev Called by owner to withdraw all funds from the lock.
-   * TODO: consider allowing anybody to trigger this as long as it goes to owner anyway?
-   */
-  function withdraw() external onlyOwner {
-    uint balance = address(this).balance;
-    require(balance > 0, "Not enough funds");
-    // Security: re-entrancy not a risk as this is the last line of an external function
-    _withdraw(balance);
-  }
-
-  /**
-   * @dev Called by owner to partially withdraw funds from the lock.
-   * TODO: consider allowing anybody to trigger this as long as it goes to owner anyway?
-   */
-  function partialWithdraw(uint _amount) external onlyOwner {
-    require(_amount > 0, "Must request an amount greater than 0");
-    uint256 balance = address(this).balance;
-    require(balance > 0 && balance >= _amount, "Not enough funds");
-    // Security: re-entrancy not a risk as this is the last line of an external function
-    _withdraw(_amount);
-  }
-
-  /**
-   * This approves _approved to get ownership of _tokenId.
-   * Note: that since this is used for both purchase and transfer approvals
-   * the approved token may not exist.
-   */
-  function approve(
-    address _approved,
-    uint _tokenId
-  ) external payable onlyKeyOwner(_tokenId) {
-    require(_approved != address(0));
-    require(msg.sender != _approved, "You can't approve yourself");
-
-    approved[_tokenId] = _approved;
-    emit Approval(ownerByTokenId[_tokenId], _approved, _tokenId);
-  }
-
-  /**
-   * A function which lets the owner of the lock to change the price for future purchases.
-   */
-  function updateKeyPrice(uint _keyPrice) external onlyOwner {
-    uint oldKeyPrice = keyPrice;
-    keyPrice = _keyPrice;
-    emit PriceChanged(oldKeyPrice, keyPrice);
-  }
-
-  /**
-   * In the specific case of a Lock, each owner can own only at most 1 key.
-   * @return The number of NFTs owned by `_owner`, either 0 or 1.
-   */
-  function balanceOf(address _owner) external view returns (uint) {
-    require(_owner != address(0), "Invalid address");
-    return keyByOwner[_owner].expirationTimestamp > 0 ? 1 : 0;
-  }
-
-  /**
-   * @notice ERC721: Find the owner of an NFT
-   * @return The address of the owner of the NFT, if applicable
-   */
-  function ownerOf(
-    uint _tokenId
-  ) external view isKey(_tokenId) returns (address) {
-    return ownerByTokenId[_tokenId];
-  }
-
-  /**
-   * @notice Find the tokenId for a given user
-   * @return The tokenId of the NFT, else revert
-   */
-  function getTokenIdFor(
-    address _account
-  ) external view hasKey(_account) returns (uint) {
-    return keyByOwner[_account].tokenId;
-  }
-
-  /**
-   * external version
-   * Will return the approved recipient for a key, if any.
-   */
-  function getApproved(uint _tokenId) external view returns (address) {
-    return _getApproved(_tokenId);
-  }
-
-  /**
-   * Public function which returns the total number of unique owners (both expired
-   * and valid).  This may be larger than outstandingKeys.
-   */
-  function numberOfOwners() public view returns (uint) {
-    return owners.length;
-  }
-
-  /**
-   * Public function which returns the total number of unique keys sold (both
-   * expired and valid)
-   */
-  function outstandingKeys() public view returns (uint) {
-    return numberOfKeysSold;
-  }
-
-  /**
-   * A function which returns a subset of the keys for this Lock as an array
-   * @param _page the page of key owners requested when faceted by page size
-   * @param _pageSize the number of Key Owners requested per page
-   */
-  function getOwnersByPage(
-    uint _page,
-    uint _pageSize
-  ) public view returns (address[]) {
-    require(outstandingKeys() > 0, "No keys to retrieve");
-    uint _startIndex = _page * _pageSize;
-    require(
-      _startIndex >= 0 && _startIndex < outstandingKeys(),
-      "Index must be in-bounds"
-    );
-    uint endOfPageIndex;
-
-    if (_startIndex + _pageSize > owners.length) {
-      endOfPageIndex = owners.length;
-      _pageSize = owners.length - _startIndex;
-    } else {
-      endOfPageIndex = (_startIndex + _pageSize);
-    }
-
-    // new temp in-memory array to hold pageSize number of requested owners:
-    address[] memory ownersByPage = new address[](_pageSize);
-    uint pageIndex = 0;
-
-    // Build the requested set of owners into a new temporary array:
-    for (uint i = _startIndex; i < endOfPageIndex; i++) {
-      ownersByPage[pageIndex] = owners[i];
-      pageIndex++;
-    }
-
-    return ownersByPage;
-  }
-
-  /**
-   * A function which lets the owner of the lock expire a users' key.
-   */
-  function expireKeyFor(address _owner) public onlyOwner hasValidKey(_owner) {
-    keyByOwner[_owner].expirationTimestamp = now; // Effectively expiring the key
-  }
-
-  /**
-   * @dev Returns the key's data field for a given owner.
-   * @param _owner address of the user for whom we search the key
-   */
-  function keyDataFor(
-    address _owner
-  ) public view hasKey(_owner) returns (bytes memory data) {
-    return keyByOwner[_owner].data;
-  }
-
-  /**
-   * @dev Returns the key's ExpirationTimestamp field for a given owner.
-   * @param _owner address of the user for whom we search the key
-   */
-  function keyExpirationTimestampFor(
-    address _owner
-  ) public view hasKey(_owner) returns (uint timestamp) {
-    return keyByOwner[_owner].expirationTimestamp;
-  }
-
-  /**
-   * @notice Handle the receipt of an NFT
-   * @dev The ERC721 smart contract calls this function on the recipient
-   * after a `safeTransfer`. This function MUST return the function selector,
-   * otherwise the caller will revert the transaction. The selector to be
-   * returned can be obtained as `this.onERC721Received.selector`. This
-   * function MAY throw to revert and reject the transfer.
-   * Note: the ERC721 contract address is always the message sender.
-   * @param operator The address which called `safeTransferFrom` function
-   * @param from The address which previously owned the token
-   * @param tokenId The NFT identifier which is being transferred
-   * @param data Additional data with no specified format
-   * @return `bytes4(keccak256("onERC721Received(address,address,uint,bytes)"))`
-   */
-  function onERC721Received(
-    address operator, // solhint-disable-line no-unused-vars
-    address from, // solhint-disable-line no-unused-vars
-    uint tokenId, // solhint-disable-line no-unused-vars
-    bytes data // solhint-disable-line no-unused-vars
-  ) public returns (bytes4) {
-    return this.onERC721Received.selector;
-  }
-
-  /**
-   * @dev Purchase function: this lets a user purchase a key from the lock for another user
-   * @param _recipient address of the recipient of the purchased key
-   * @param _data optional marker for the key
-   * This will fail if
-   *  - the keyReleaseMechanism is private
-   *  - the keyReleaseMechanism is Approved and the recipient has not been previously approved
-   *  - the amount value is smaller than the price
-   *  - the recipient already owns a key
-   * TODO: next version of solidity will allow for message to be added to require.
-   */
-  function _purchaseFor(
-    address _recipient,
-    address _referrer,
-    bytes memory _data
-  ) internal notSoldOut {
-    // solhint-disable-line function-max-lines
-    require(_recipient != address(0));
-
-    // Let's get the actual price for the key from the Unlock smart contract
-    IUnlock unlock = IUnlock(unlockProtocol);
-    uint discount;
-    uint tokens;
-    uint inMemoryKeyPrice = keyPrice;
-    (discount, tokens) = unlock.computeAvailableDiscountFor(
-      _recipient,
-      inMemoryKeyPrice
-    );
-    uint netPrice = inMemoryKeyPrice;
-    if (discount > inMemoryKeyPrice) {
-      netPrice = 0;
-    } else {
-      // SafeSub not required as the if statement already confirmed `inMemoryKeyPrice - discount` cannot underflow
-      netPrice = inMemoryKeyPrice - discount;
-    }
-
-    // We explicitly allow for greater amounts to allow "donations" or partial refunds after
-    // discounts (TODO implement partial refunds)
-    require(msg.value >= netPrice, "Insufficient funds");
-    // TODO: If there is more than the required price, then let's return whatever is extra
-    // extra (CAREFUL: re-entrancy!)
-
-    // Assign the key
-    uint previousExpiration = keyByOwner[_recipient].expirationTimestamp;
-    if (previousExpiration < now) {
-      if (previousExpiration == 0) {
-        // This is a brand new owner, else an owner of an expired key buying an extension
-        numberOfKeysSold++;
-        owners.push(_recipient);
-        // Note: for ERC721 support we will be changing tokenId to be a sequence id instead
-        ownerByTokenId[uint(_recipient)] = _recipient;
-        // At the moment tokenId is the user's address, but as we work towards ERC721
-        // support this will change to a sequenceId assigned at purchase.
-        keyByOwner[_recipient].tokenId = uint(_recipient);
-      }
-      // SafeAdd is not required here since expirationDuration is capped to a tiny value
-      // (relative to the size of a uint)
-      keyByOwner[_recipient].expirationTimestamp = now + expirationDuration;
-    } else {
-      // This is an existing owner trying to extend their key
-      keyByOwner[_recipient].expirationTimestamp = previousExpiration.add(
-        expirationDuration
-      );
-    }
-    // Overwite data in all cases
-    keyByOwner[_recipient].data = _data;
-
-    if (discount > 0) {
-      unlock.recordConsumedDiscount(discount, tokens);
-    }
-
-    unlock.recordKeyPurchase(netPrice, _referrer);
-
-    // trigger event
-    emit Transfer(
-      address(0), // This is a creation.
-      _recipient,
-      uint(_recipient) // Note: since each user can own a single token, we use the current
-      // owner (new!) for the token id
-    );
-  }
-
-  /**
-   * Will return the approved recipient for a key transfer or ownership.
-   * Note: this does not check that a corresponding key
-   * actually exists.
-   */
-  function _getApproved(uint _tokenId) internal view returns (address) {
-    address approvedRecipient = approved[_tokenId];
-    require(approvedRecipient != address(0), "No approved recipient exists");
-    return approvedRecipient;
-  }
-
-  /**
-   * @dev private version of the withdraw function which handles all withdrawals from the lock.
-   *
-   * Security: Be wary of re-entrancy when calling this.
-   */
-  function _withdraw(uint _amount) private {
-    Ownable.owner().transfer(_amount);
-    emit Withdrawal(msg.sender, _amount);
-  }
-}
-
-// File contracts/Unlock.sol
-
-pragma solidity 0.4.25;
-
-/**
- * @title The Unlock contract
- * @author Julien Genestoux (unlock-protocol.com)
- * This smart contract has 3 main roles:
- *  1. Distribute discounts to discount token holders
- *  2. Grant dicount tokens to users making referrals and/or publishers granting discounts.
- *  3. Create & deploy Public Lock contracts.
- * In order to achieve these 3 elements, it keeps track of several things such as
- *  a. Deployed locks addresses and balances of discount tokens granted by each lock.
- *  b. The total network product (sum of all key sales, net of discounts)
- *  c. Total of discounts granted
- *  d. Balances of discount tokens, including "frozen" tokens (which have been used to claim
- * discounts and cannot be used/transfered for a given period)
- *  e. Growth rate of Network Product
- *  f. Growth rate of Discount tokens supply
- * The smart contract has an owner who only can perform the following
- *  - Upgrades
- *  - Change in golden rules (20% of GDP available in discounts, and supply growth rate is at most
- * 50% of GNP growth rate)
- * NOTE: This smart contract is partially implemented for now until enough Locks are deployed and
- * in the wild.
- * The partial implementation includes the following features:
- *  a. Keeping track of deployed locks
- *  b. Keeping track of GNP
- */
-
-/// @dev Must list the direct base contracts in the order from “most base-like” to “most derived”.
-/// https://solidity.readthedocs.io/en/latest/contracts.html#multiple-inheritance-and-linearization
-contract Unlock is IUnlock, Initializable, Ownable {
-  /**
-   * The struct for a lock
-   * We use deployed to keep track of deployments.
-   * This is required because both totalSales and yieldedDiscountTokens are 0 when initialized,
-   * which would be the same values when the lock is not set.
-   */
-  struct LockBalances {
-    bool deployed;
-    uint totalSales; // This is in wei
-    uint yieldedDiscountTokens;
-  }
-
-  modifier onlyFromDeployedLock() {
-    require(locks[msg.sender].deployed, "Only from previously deployed locks");
-    _;
-  }
-
-  uint public grossNetworkProduct;
-
-  uint public totalDiscountGranted;
-
-  // We keep track of deployed locks to ensure that callers are all deployed locks.
-  mapping(address => LockBalances) public locks;
-
-  // Events
-  event NewLock(address indexed lockOwner, address indexed newLockAddress);
-
-  // Use initialize instead of a constructor to support proxies (for upgradeability via zos).
-  function initialize(address _owner) public initializer {
-    // We must manually initialize Ownable.sol
-    Ownable.initialize(_owner);
-    grossNetworkProduct = 0;
-    totalDiscountGranted = 0;
-  }
-
-  /**
-   * @dev Create lock
-   * This deploys a lock for a creator. It also keeps track of the deployed lock.
-   */
-  function createLock(
-    uint _expirationDuration,
-    uint _keyPrice,
-    uint _maxNumberOfKeys
-  ) public returns (ILockCore lock) {
-    // create lock
-    PublicLock newPublicLock = new PublicLock(
-      msg.sender,
-      _expirationDuration,
-      _keyPrice,
-      _maxNumberOfKeys
-    );
-
-    // Assign the new Lock
-    locks[address(newPublicLock)] = LockBalances({
-      deployed: true,
-      totalSales: 0,
-      yieldedDiscountTokens: 0
-    });
-
-    // trigger event
-    emit NewLock(msg.sender, address(newPublicLock));
-
-    // return the created lock
-    return newPublicLock;
-  }
-
-  /**
-   * This function returns the discount available for a user, when purchasing a
-   * a key from a lock.
-   * This does not modify the state. It returns both the discount and the number of tokens
-   * consumed to grant that discount.
-   * TODO: actually implement this.
-   */
-  function computeAvailableDiscountFor(
-    address _purchaser, // solhint-disable-line no-unused-vars
-    uint _keyPrice // solhint-disable-line no-unused-vars
-  ) public view returns (uint discount, uint tokens) {
-    // TODO: implement me
-    return (0, 0);
-  }
-
-  /**
-   * This function keeps track of the added GDP, as well as grants of discount tokens
-   * to the referrer, if applicable.
-   * The number of discount tokens granted is based on the value of the referal,
-   * the current growth rate and the lock's discount token distribution rate
-   * This function is invoked by a previously deployed lock only.
-   * TODO: actually implement
-   */
-  function recordKeyPurchase(
-    uint _value,
-    address _referrer // solhint-disable-line no-unused-vars
-  ) public onlyFromDeployedLock {
-    // TODO: implement me
-    grossNetworkProduct += _value;
-    return;
-  }
-
-  /**
-   * This function will keep track of consumed discounts by a given user.
-   * It will also grant discount tokens to the creator who is granting the discount based on the
-   * amount of discount and compensation rate.
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordConsumedDiscount(
-    uint _discount,
-    uint _tokens // solhint-disable-line no-unused-vars
-  ) public onlyFromDeployedLock {
-    // TODO: implement me
-    totalDiscountGranted += _discount;
-    return;
-  }
-}
diff --git a/packages/contracts/src/contracts/Unlock/UnlockV1.sol b/packages/contracts/src/contracts/Unlock/UnlockV1.sol
deleted file mode 100644
index 70c857c4be5..00000000000
--- a/packages/contracts/src/contracts/Unlock/UnlockV1.sol
+++ /dev/null
@@ -1,1957 +0,0 @@
-// Sources flattened with hardhat v2.4.1 https://hardhat.org
-
-// File zos-lib/contracts/Initializable.sol@v2.2.2
-
-pragma solidity >=0.4.24 <0.6.0;
-
-/**
- * @title Initializable
- *
- * @dev Helper contract to support initializer functions. To use it, replace
- * the constructor with a function that has the `initializer` modifier.
- * WARNING: Unlike constructors, initializer functions must be manually
- * invoked. This applies both to deploying an Initializable contract, as well
- * as extending an Initializable contract via inheritance.
- * WARNING: When used with inheritance, manual care must be taken to not invoke
- * a parent initializer twice, or ensure that all initializers are idempotent,
- * because this is not dealt with automatically as with constructors.
- */
-contract Initializable {
-  /**
-   * @dev Indicates that the contract has been initialized.
-   */
-  bool private initialized;
-
-  /**
-   * @dev Indicates that the contract is in the process of being initialized.
-   */
-  bool private initializing;
-
-  /**
-   * @dev Modifier to use in the initializer function of a contract.
-   */
-  modifier initializer() {
-    require(
-      initializing || isConstructor() || !initialized,
-      "Contract instance has already been initialized"
-    );
-
-    bool wasInitializing = initializing;
-    initializing = true;
-    initialized = true;
-
-    _;
-
-    initializing = wasInitializing;
-  }
-
-  /// @dev Returns true if and only if the function is running in the constructor
-  function isConstructor() private view returns (bool) {
-    // extcodesize checks the size of the code stored in an address, and
-    // address returns the current address. Since the code is still not
-    // deployed when running a constructor, any checks on its code size will
-    // yield zero, making it an effective way to detect if a contract is
-    // under construction or not.
-    uint256 cs;
-    assembly {
-      cs := extcodesize(address)
-    }
-    return cs == 0;
-  }
-
-  // Reserved storage space to allow for layout changes in the future.
-  uint256[50] private ______gap;
-}
-
-// File openzeppelin-eth/contracts/ownership/Ownable.sol@v2.1.3
-
-pragma solidity ^0.5.0;
-
-/**
- * @title Ownable
- * @dev The Ownable contract has an owner address, and provides basic authorization control
- * functions, this simplifies the implementation of "user permissions".
- */
-contract Ownable is Initializable {
-  address private _owner;
-
-  event OwnershipTransferred(
-    address indexed previousOwner,
-    address indexed newOwner
-  );
-
-  /**
-   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
-   * account.
-   */
-  function initialize(address sender) public initializer {
-    _owner = sender;
-    emit OwnershipTransferred(address(0), _owner);
-  }
-
-  /**
-   * @return the address of the owner.
-   */
-  function owner() public view returns (address) {
-    return _owner;
-  }
-
-  /**
-   * @dev Throws if called by any account other than the owner.
-   */
-  modifier onlyOwner() {
-    require(isOwner());
-    _;
-  }
-
-  /**
-   * @return true if `msg.sender` is the owner of the contract.
-   */
-  function isOwner() public view returns (bool) {
-    return msg.sender == _owner;
-  }
-
-  /**
-   * @dev Allows the current owner to relinquish control of the contract.
-   * @notice Renouncing to ownership will leave the contract without an owner.
-   * It will not be possible to call the functions with the `onlyOwner`
-   * modifier anymore.
-   */
-  function renounceOwnership() public onlyOwner {
-    emit OwnershipTransferred(_owner, address(0));
-    _owner = address(0);
-  }
-
-  /**
-   * @dev Allows the current owner to transfer control of the contract to a newOwner.
-   * @param newOwner The address to transfer ownership to.
-   */
-  function transferOwnership(address newOwner) public onlyOwner {
-    _transferOwnership(newOwner);
-  }
-
-  /**
-   * @dev Transfers control of the contract to a newOwner.
-   * @param newOwner The address to transfer ownership to.
-   */
-  function _transferOwnership(address newOwner) internal {
-    require(newOwner != address(0));
-    emit OwnershipTransferred(_owner, newOwner);
-    _owner = newOwner;
-  }
-
-  uint256[50] private ______gap;
-}
-
-// File contracts/interfaces/IERC721.sol
-
-pragma solidity 0.5.7;
-
-/// @title ERC-721 Non-Fungible Token Standard
-/// @dev See https://eips.ethereum.org/EIPS/eip-721
-///  Note: the ERC-165 identifier for this interface is 0x80ac58cd
-
-interface IERC721 {
-  /// @dev This emits when ownership of any NFT changes by any mechanism.
-  ///  This event emits when NFTs are created (`from` == 0) and destroyed
-  ///  (`to` == 0). Exception: during contract creation, any number of NFTs
-  ///  may be created and assigned without emitting Transfer. At the time of
-  ///  any transfer, the approved address for that NFT (if any) is reset to none.
-  event Transfer(
-    address indexed _from,
-    address indexed _to,
-    uint indexed _tokenId
-  );
-
-  /// @dev This emits when the approved address for an NFT is changed or
-  ///  reaffirmed. The zero address indicates there is no approved address.
-  ///  When a Transfer event emits, this also indicates that the approved
-  ///  address for that NFT (if any) is reset to none.
-  event Approval(
-    address indexed _owner,
-    address indexed _approved,
-    uint indexed _tokenId
-  );
-
-  /// @dev This emits when an operator is enabled or disabled for an owner.
-  ///  The operator can manage all NFTs of the owner.
-  event ApprovalForAll(
-    address indexed _owner,
-    address indexed _operator,
-    bool _approved
-  );
-
-  /// @notice Transfer ownership of an NFT -- THE CALLER IS RESPONSIBLE
-  ///  TO CONFIRM THAT `_to` IS CAPABLE OF RECEIVING NFTS OR ELSE
-  ///  THEY MAY BE PERMANENTLY LOST
-  /// @dev Throws unless `msg.sender` is the current owner, an authorized
-  ///  operator, or the approved address for this NFT. Throws if `_from` is
-  ///  not the current owner. Throws if `_to` is the zero address. Throws if
-  ///  `_tokenId` is not a valid NFT.
-  /// @param _from The current owner of the NFT
-  /// @param _to The new owner
-  /// @param _tokenId The NFT to transfer
-  function transferFrom(
-    address _from,
-    address _to,
-    uint _tokenId
-  ) external payable;
-
-  /// @notice Set or reaffirm the approved address for an NFT
-  /// @dev The zero address indicates there is no approved address.
-  /// @dev Throws unless `msg.sender` is the current NFT owner, or an authorized
-  ///  operator of the current owner.
-  /// @param _approved The new approved NFT controller
-  /// @param _tokenId The NFT to approve
-  function approve(address _approved, uint _tokenId) external payable;
-
-  /// @notice Transfers the ownership of an NFT from one address to another address
-  /// @dev Throws unless `msg.sender` is the current owner, an authorized
-  ///  operator, or the approved address for this NFT. Throws if `_from` is
-  ///  not the current owner. Throws if `_to` is the zero address. Throws if
-  ///  `_tokenId` is not a valid NFT. When transfer is complete, this function
-  ///  checks if `_to` is a smart contract (code size > 0). If so, it calls
-  ///  `onERC721Received` on `_to` and throws if the return value is not
-  ///  `bytes4(keccak256('onERC721Received(address,address,uint,bytes)'))`.
-  /// @param _from The current owner of the NFT
-  /// @param _to The new owner
-  /// @param _tokenId The NFT to transfer
-  /// @param data Additional data with no specified format, sent in call to `_to`
-  function safeTransferFrom(
-    address _from,
-    address _to,
-    uint _tokenId,
-    bytes calldata data
-  ) external payable;
-
-  /// @notice Transfers the ownership of an NFT from one address to another address
-  /// @dev This works identically to the other function with an extra data parameter,
-  ///  except this function just sets data to ''
-  /// @param _from The current owner of the NFT
-  /// @param _to The new owner
-  /// @param _tokenId The NFT to transfer
-  function safeTransferFrom(
-    address _from,
-    address _to,
-    uint _tokenId
-  ) external payable;
-
-  /// @notice Enable or disable approval for a third party ('operator') to manage
-  ///  all of `msg.sender`'s assets.
-  /// @dev Emits the ApprovalForAll event. The contract MUST allow
-  ///  multiple operators per owner.
-  /// @param _operator Address to add to the set of authorized operators.
-  /// @param _approved True if the operator is approved, false to revoke approval
-  function setApprovalForAll(address _operator, bool _approved) external;
-
-  /// @notice Count all NFTs assigned to an owner
-  /// @dev NFTs assigned to the zero address are considered invalid, and this
-  ///  function throws for queries about the zero address.
-  /// @param _owner An address for whom to query the balance
-  /// @return The number of NFTs owned by `_owner`, possibly zero
-  function balanceOf(address _owner) external view returns (uint);
-
-  /// @notice Find the owner of an NFT
-  /// @dev NFTs assigned to zero address are considered invalid, and queries
-  ///  about them do throw.
-  /// @param _tokenId The identifier for an NFT
-  /// @return The address of the owner of the NFT
-  function ownerOf(uint _tokenId) external view returns (address);
-
-  /// @notice Get the approved address for a single NFT
-  /// @dev Throws if `_tokenId` is not a valid NFT
-  /// @param _tokenId The NFT to find the approved address for
-  /// @return The approved address for this NFT, or the zero address if there is none
-  function getApproved(uint _tokenId) external view returns (address);
-
-  /// @notice Query if an address is an authorized operator for another address
-  /// @param _owner The address that owns the NFTs
-  /// @param _operator The address that acts on behalf of the owner
-  /// @return True if `_operator` is an approved operator for `_owner`, false otherwise
-  function isApprovedForAll(
-    address _owner,
-    address _operator
-  ) external view returns (bool);
-
-  /// @notice A descriptive name for a collection of NFTs in this contract
-  function name() external view returns (string memory _name);
-}
-
-// File contracts/interfaces/ILockCore.sol
-
-pragma solidity 0.5.7;
-
-/**
- * @title The Lock interface core methods for a Lock
- * @author HardlyDifficult (unlock-protocol.com)
- */
-interface ILockCore {
-  /**
-   * @dev Purchase function, public version, with no referrer.
-   * @param _recipient address of the recipient of the purchased key
-   */
-  function purchaseFor(address _recipient) external payable;
-
-  /**
-   * @dev Purchase function, public version, with referrer.
-   * @param _recipient address of the recipient of the purchased key
-   * @param _referrer address of the user making the referral
-   */
-  function purchaseForFrom(
-    address _recipient,
-    address _referrer
-  ) external payable;
-
-  /**
-   * @dev Destroys the user's key and sends a refund based on the amount of time remaining.
-   */
-  function cancelAndRefund() external;
-
-  /**
-   * @dev Called by owner to withdraw all funds from the lock.
-   */
-  function withdraw() external;
-
-  /**
-   * @dev Called by owner to partially withdraw funds from the lock.
-   */
-  function partialWithdraw(uint _amount) external;
-
-  /**
-   * A function which lets the owner of the lock expire a users' key.
-   */
-  function expireKeyFor(address _owner) external;
-
-  /**
-   * A function which lets the owner of the lock to change the price for future purchases.
-   */
-  function updateKeyPrice(uint _keyPrice) external;
-
-  /**
-   * @dev Used to disable lock before migrating keys and/or destroying contract.
-   * @dev Reverts if called by anyone but the owner.
-   * @dev Reverts if isAlive == false
-   * @dev Should emit Disable event.
-   */
-  function disableLock() external;
-
-  /**
-   * @dev Used to clean up old lock contracts from the blockchain by using selfdestruct.
-   * @dev Reverts if called by anyone but the owner.
-   * @dev Reverts if isAlive == true
-   * @dev Should emit Destroy event.
-   */
-  function destroyLock() external;
-
-  /**
-   * @dev Determines how much of a refund a key owner would receive if they issued
-   * a cancelAndRefund now.
-   * @param _owner The owner of the key check the refund value for.
-   * Note that due to the time required to mine a tx, the actual refund amount will be lower
-   * than what the user reads from this call.
-   */
-  function getCancelAndRefundValueFor(
-    address _owner
-  ) external view returns (uint refund);
-
-  /**
-   * Checks if the user has a non-expired key.
-   */
-  function getHasValidKey(address _owner) external view returns (bool);
-
-  /**
-   * Public function which returns the total number of unique owners (both expired
-   * and valid).  This may be larger than totalSupply.
-   */
-  function numberOfOwners() external view returns (uint);
-
-  /**
-   * Public function which returns the total number of keys (both expired and valid)
-   *
-   * This function signature is from the ERC-721 enumerable extension.
-   * https://eips.ethereum.org/EIPS/eip-721
-   * @notice Count NFTs tracked by this contract
-   * @return A count of valid NFTs tracked by this contract, where each one of
-   * them has an assigned and queryable owner not equal to the zero address
-   */
-  function totalSupply() external view returns (uint);
-
-  /**
-   * @dev Returns the key's ExpirationTimestamp field for a given owner.
-   * @param _owner address of the user for whom we search the key
-   */
-  function keyExpirationTimestampFor(
-    address _owner
-  ) external view returns (uint timestamp);
-
-  /**
-   * @param _page the page of key owners requested when faceted by page size
-   * @param _pageSize the number of Key Owners requested per page
-   */
-  function getOwnersByPage(
-    uint _page,
-    uint _pageSize
-  ) external view returns (address[] memory);
-}
-
-// File openzeppelin-solidity/contracts/introspection/IERC165.sol@v2.1.3
-
-pragma solidity ^0.5.0;
-
-/**
- * @title IERC165
- * @dev https://github.com/ethereum/EIPs/blob/master/EIPS/eip-165.md
- */
-interface IERC165 {
-  /**
-   * @notice Query if a contract implements an interface
-   * @param interfaceId The interface identifier, as specified in ERC-165
-   * @dev Interface identification is specified in ERC-165. This function
-   * uses less than 30,000 gas.
-   */
-  function supportsInterface(bytes4 interfaceId) external view returns (bool);
-}
-
-// File openzeppelin-solidity/contracts/introspection/ERC165.sol@v2.1.3
-
-pragma solidity ^0.5.0;
-
-/**
- * @title ERC165
- * @author Matt Condon (@shrugs)
- * @dev Implements ERC165 using a lookup table.
- */
-contract ERC165 is IERC165 {
-  bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;
-  /**
-   * 0x01ffc9a7 ===
-   *     bytes4(keccak256('supportsInterface(bytes4)'))
-   */
-
-  /**
-   * @dev a mapping of interface id to whether or not it's supported
-   */
-  mapping(bytes4 => bool) private _supportedInterfaces;
-
-  /**
-   * @dev A contract implementing SupportsInterfaceWithLookup
-   * implement ERC165 itself
-   */
-  constructor() internal {
-    _registerInterface(_INTERFACE_ID_ERC165);
-  }
-
-  /**
-   * @dev implement supportsInterface(bytes4) using a lookup table
-   */
-  function supportsInterface(bytes4 interfaceId) external view returns (bool) {
-    return _supportedInterfaces[interfaceId];
-  }
-
-  /**
-   * @dev internal method for registering an interface
-   */
-  function _registerInterface(bytes4 interfaceId) internal {
-    require(interfaceId != 0xffffffff);
-    _supportedInterfaces[interfaceId] = true;
-  }
-}
-
-// File openzeppelin-solidity/contracts/token/ERC721/IERC721Receiver.sol@v2.1.3
-
-pragma solidity ^0.5.0;
-
-/**
- * @title ERC721 token receiver interface
- * @dev Interface for any contract that wants to support safeTransfers
- * from ERC721 asset contracts.
- */
-contract IERC721Receiver {
-  /**
-   * @notice Handle the receipt of an NFT
-   * @dev The ERC721 smart contract calls this function on the recipient
-   * after a `safeTransfer`. This function MUST return the function selector,
-   * otherwise the caller will revert the transaction. The selector to be
-   * returned can be obtained as `this.onERC721Received.selector`. This
-   * function MAY throw to revert and reject the transfer.
-   * Note: the ERC721 contract address is always the message sender.
-   * @param operator The address which called `safeTransferFrom` function
-   * @param from The address which previously owned the token
-   * @param tokenId The NFT identifier which is being transferred
-   * @param data Additional data with no specified format
-   * @return `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
-   */
-  function onERC721Received(
-    address operator,
-    address from,
-    uint256 tokenId,
-    bytes memory data
-  ) public returns (bytes4);
-}
-
-// File openzeppelin-solidity/contracts/token/ERC721/ERC721Holder.sol@v2.1.3
-
-pragma solidity ^0.5.0;
-
-contract ERC721Holder is IERC721Receiver {
-  function onERC721Received(
-    address,
-    address,
-    uint256,
-    bytes memory
-  ) public returns (bytes4) {
-    return this.onERC721Received.selector;
-  }
-}
-
-// File contracts/mixins/MixinDisableAndDestroy.sol
-
-pragma solidity 0.5.7;
-
-/**
- * @title Mixin allowing the Lock owner to disable a Lock (preventing new purchases)
- * and then destroy it.
- * @author HardlyDifficult
- * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
- * separates logically groupings of code to ease readability.
- */
-contract MixinDisableAndDestroy is IERC721, Ownable {
-  // Used to disable payable functions when deprecating an old lock
-  bool public isAlive;
-
-  event Destroy(uint balance, address indexed owner);
-
-  event Disable();
-
-  constructor() internal {
-    isAlive = true;
-  }
-
-  // Only allow usage when contract is Alive
-  modifier onlyIfAlive() {
-    require(isAlive, "LOCK_DEPRECATED");
-    _;
-  }
-
-  /**
-   * @dev Used to disable lock before migrating keys and/or destroying contract
-   */
-  function disableLock() external onlyOwner onlyIfAlive {
-    emit Disable();
-    isAlive = false;
-  }
-
-  /**
-   * @dev Used to clean up old lock contracts from the blockchain
-   * TODO: add a check to ensure all keys are INVALID!
-   */
-  function destroyLock() external onlyOwner {
-    require(isAlive == false, "DISABLE_FIRST");
-    emit Destroy(address(this).balance, msg.sender);
-    selfdestruct(msg.sender);
-    // Note we don't clean up the `locks` data in Unlock.sol as it should not be necessary
-    // and leaves some data behind ('Unlock.LockBalances') which may be helpful.
-  }
-}
-
-// File contracts/interfaces/IUnlock.sol
-
-pragma solidity 0.5.7;
-
-/**
- * @title The Unlock Interface
- **/
-
-interface IUnlock {
-  // Events
-  event NewLock(address indexed lockOwner, address indexed newLockAddress);
-
-  // Use initialize instead of a constructor to support proxies (for upgradeability via zos).
-  function initialize(address _owner) external;
-
-  /**
-   * @dev Create lock
-   * This deploys a lock for a creator. It also keeps track of the deployed lock.
-   * @param _tokenAddress set to the ERC20 token address, or 0 for ETH.
-   * Return type `ILockCore` is the most specific interface from which all lock types inherit.
-   */
-  function createLock(
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys
-  ) external returns (ILockCore lock);
-
-  /**
-   * This function keeps track of the added GDP, as well as grants of discount tokens
-   * to the referrer, if applicable.
-   * The number of discount tokens granted is based on the value of the referal,
-   * the current growth rate and the lock's discount token distribution rate
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordKeyPurchase(
-    uint _value,
-    address _referrer // solhint-disable-line no-unused-vars
-  ) external;
-
-  /**
-   * This function will keep track of consumed discounts by a given user.
-   * It will also grant discount tokens to the creator who is granting the discount based on the
-   * amount of discount and compensation rate.
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordConsumedDiscount(
-    uint _discount,
-    uint _tokens // solhint-disable-line no-unused-vars
-  ) external;
-
-  /**
-   * This function returns the discount available for a user, when purchasing a
-   * a key from a lock.
-   * This does not modify the state. It returns both the discount and the number of tokens
-   * consumed to grant that discount.
-   */
-  function computeAvailableDiscountFor(
-    address _purchaser, // solhint-disable-line no-unused-vars
-    uint _keyPrice // solhint-disable-line no-unused-vars
-  ) external view returns (uint discount, uint tokens);
-}
-
-// File openzeppelin-solidity/contracts/token/ERC20/IERC20.sol@v2.1.3
-
-pragma solidity ^0.5.0;
-
-/**
- * @title ERC20 interface
- * @dev see https://github.com/ethereum/EIPs/issues/20
- */
-interface IERC20 {
-  function transfer(address to, uint256 value) external returns (bool);
-
-  function approve(address spender, uint256 value) external returns (bool);
-
-  function transferFrom(
-    address from,
-    address to,
-    uint256 value
-  ) external returns (bool);
-
-  function totalSupply() external view returns (uint256);
-
-  function balanceOf(address who) external view returns (uint256);
-
-  function allowance(
-    address owner,
-    address spender
-  ) external view returns (uint256);
-
-  event Transfer(address indexed from, address indexed to, uint256 value);
-
-  event Approval(address indexed owner, address indexed spender, uint256 value);
-}
-
-// File contracts/mixins/MixinFunds.sol
-
-pragma solidity 0.5.7;
-
-/**
- * @title An implementation of the money related functions.
- * @author HardlyDifficult (unlock-protocol.com)
- */
-contract MixinFunds {
-  /**
-   * The token-type that this Lock is priced in.  If 0, then use ETH, else this is
-   * a ERC20 token address.
-   */
-  address public tokenAddress;
-
-  constructor(address _tokenAddress) public {
-    require(
-      _tokenAddress == address(0) || IERC20(_tokenAddress).totalSupply() > 0,
-      "INVALID_TOKEN"
-    );
-    tokenAddress = _tokenAddress;
-  }
-
-  /**
-   * Ensures that the msg.sender has paid at least the price stated.
-   *
-   * With ETH, this means the function originally called was `payable` and the
-   * transaction included at least the amount requested.
-   *
-   * Security: be wary of re-entrancy when calling this function.
-   */
-  function _chargeAtLeast(uint _price) internal {
-    if (tokenAddress == address(0)) {
-      require(msg.value >= _price, "NOT_ENOUGH_FUNDS");
-    } else {
-      IERC20 token = IERC20(tokenAddress);
-      uint balanceBefore = token.balanceOf(address(this));
-      token.transferFrom(msg.sender, address(this), _price);
-
-      // There are known bugs in popular ERC20 implements which means we cannot
-      // trust the return value of `transferFrom`.  This require statement ensures
-      // that a transfer occurred.
-      require(
-        token.balanceOf(address(this)) > balanceBefore,
-        "TRANSFER_FAILED"
-      );
-    }
-  }
-
-  /**
-   * Transfers funds from the contract to the account provided.
-   *
-   * Security: be wary of re-entrancy when calling this function.
-   */
-  function _transfer(address _to, uint _amount) internal {
-    if (tokenAddress == address(0)) {
-      address(uint160(_to)).transfer(_amount);
-    } else {
-      IERC20 token = IERC20(tokenAddress);
-      uint balanceBefore = token.balanceOf(_to);
-      token.transfer(_to, _amount);
-
-      // There are known bugs in popular ERC20 implements which means we cannot
-      // trust the return value of `transferFrom`.  This require statement ensures
-      // that a transfer occurred.
-      require(token.balanceOf(_to) > balanceBefore, "TRANSFER_FAILED");
-    }
-  }
-
-  /**
-   * Gets the current balance of the account provided.
-   */
-  function _getBalance(address _account) internal view returns (uint) {
-    if (tokenAddress == address(0)) {
-      return _account.balance;
-    } else {
-      return IERC20(tokenAddress).balanceOf(_account);
-    }
-  }
-}
-
-// File contracts/mixins/MixinLockCore.sol
-
-pragma solidity 0.5.7;
-
-/**
- * @title Mixin for core lock data and functions.
- * @author HardlyDifficult
- * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
- * separates logically groupings of code to ease readability.
- */
-contract MixinLockCore is Ownable, MixinFunds, MixinDisableAndDestroy {
-  event PriceChanged(uint oldKeyPrice, uint keyPrice);
-
-  event Withdrawal(address indexed _sender, uint _amount);
-
-  // Unlock Protocol address
-  // TODO: should we make that private/internal?
-  IUnlock public unlockProtocol;
-
-  // Duration in seconds for which the keys are valid, after creation
-  // should we take a smaller type use less gas?
-  // TODO: add support for a timestamp instead of duration
-  uint public expirationDuration;
-
-  // price in wei of the next key
-  // TODO: allow support for a keyPriceCalculator which could set prices dynamically
-  uint public keyPrice;
-
-  // Max number of keys sold if the keyReleaseMechanism is public
-  uint public maxNumberOfKeys;
-
-  // A count of how many new key purchases there have been
-  uint public numberOfKeysSold;
-
-  // The version number for this lock contract,
-  uint public publicLockVersion;
-
-  // Ensure that the Lock has not sold all of its keys.
-  modifier notSoldOut() {
-    require(maxNumberOfKeys > numberOfKeysSold, "LOCK_SOLD_OUT");
-    _;
-  }
-
-  constructor(
-    uint _expirationDuration,
-    uint _keyPrice,
-    uint _maxNumberOfKeys,
-    uint _version
-  ) internal {
-    require(
-      _expirationDuration <= 100 * 365 * 24 * 60 * 60,
-      "MAX_EXPIRATION_100_YEARS"
-    );
-    unlockProtocol = IUnlock(msg.sender); // Make sure we link back to Unlock's smart contract.
-    expirationDuration = _expirationDuration;
-    keyPrice = _keyPrice;
-    maxNumberOfKeys = _maxNumberOfKeys;
-    publicLockVersion = _version;
-  }
-
-  /**
-   * @dev Called by owner to withdraw all funds from the lock.
-   * TODO: consider allowing anybody to trigger this as long as it goes to owner anyway?
-   */
-  function withdraw() external onlyOwner {
-    uint balance = _getBalance(address(this));
-    require(balance > 0, "NOT_ENOUGH_FUNDS");
-    // Security: re-entrancy not a risk as this is the last line of an external function
-    _withdraw(balance);
-  }
-
-  /**
-   * @dev Called by owner to partially withdraw funds from the lock.
-   * TODO: consider allowing anybody to trigger this as long as it goes to owner anyway?
-   */
-  function partialWithdraw(uint _amount) external onlyOwner {
-    require(_amount > 0, "GREATER_THAN_ZERO");
-    uint balance = _getBalance(address(this));
-    require(balance >= _amount, "NOT_ENOUGH_FUNDS");
-    // Security: re-entrancy not a risk as this is the last line of an external function
-    _withdraw(_amount);
-  }
-
-  /**
-   * A function which lets the owner of the lock to change the price for future purchases.
-   */
-  function updateKeyPrice(uint _keyPrice) external onlyOwner onlyIfAlive {
-    uint oldKeyPrice = keyPrice;
-    keyPrice = _keyPrice;
-    emit PriceChanged(oldKeyPrice, keyPrice);
-  }
-
-  /**
-   * Public function which returns the total number of unique keys sold (both
-   * expired and valid)
-   */
-  function totalSupply() public view returns (uint) {
-    return numberOfKeysSold;
-  }
-
-  /**
-   * @dev private version of the withdraw function which handles all withdrawals from the lock.
-   *
-   * Security: Be wary of re-entrancy when calling this.
-   */
-  function _withdraw(uint _amount) private {
-    _transfer(Ownable.owner(), _amount);
-    emit Withdrawal(msg.sender, _amount);
-  }
-}
-
-// File contracts/mixins/MixinKeys.sol
-
-pragma solidity 0.5.7;
-
-/**
- * @title Mixin for managing `Key` data.
- * @author HardlyDifficult
- * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
- * separates logically groupings of code to ease readability.
- */
-contract MixinKeys is Ownable, MixinLockCore {
-  // The struct for a key
-  struct Key {
-    uint tokenId;
-    uint expirationTimestamp;
-  }
-
-  // Called when the Lock owner expires a user's Key
-  event ExpireKey(uint tokenId);
-
-  // Keys
-  // Each owner can have at most exactly one key
-  // TODO: could we use public here? (this could be confusing though because it getter will
-  // return 0 values when missing a key)
-  mapping(address => Key) private keyByOwner;
-
-  // Each tokenId can have at most exactly one owner at a time.
-  // Returns 0 if the token does not exist
-  // TODO: once we decouple tokenId from owner address (incl in js), then we can consider
-  // merging this with numberOfKeysSold into an array instead.
-  mapping(uint => address) private ownerByTokenId;
-
-  // Addresses of owners are also stored in an array.
-  // Addresses are never removed by design to avoid abuses around referals
-  address[] public owners;
-
-  // Ensures that an owner has a key
-  modifier hasKey(address _owner) {
-    Key storage key = keyByOwner[_owner];
-    require(key.expirationTimestamp > 0, "NO_SUCH_KEY");
-    _;
-  }
-
-  // Ensures that an owner has a valid key
-  modifier hasValidKey(address _owner) {
-    require(getHasValidKey(_owner), "KEY_NOT_VALID");
-    _;
-  }
-
-  // Ensures that a key has an owner
-  modifier isKey(uint _tokenId) {
-    require(ownerByTokenId[_tokenId] != address(0), "NO_SUCH_KEY");
-    _;
-  }
-
-  // Ensure that the caller owns the key
-  modifier onlyKeyOwner(uint _tokenId) {
-    require(isKeyOwner(_tokenId, msg.sender), "ONLY_KEY_OWNER");
-    _;
-  }
-
-  /**
-   * A function which lets the owner of the lock expire a users' key.
-   */
-  function expireKeyFor(address _owner) public onlyOwner hasValidKey(_owner) {
-    Key storage key = keyByOwner[_owner];
-    key.expirationTimestamp = block.timestamp; // Effectively expiring the key
-    emit ExpireKey(key.tokenId);
-  }
-
-  /**
-   * In the specific case of a Lock, each owner can own only at most 1 key.
-   * @return The number of NFTs owned by `_owner`, either 0 or 1.
-   */
-  function balanceOf(address _owner) external view returns (uint) {
-    require(_owner != address(0), "INVALID_ADDRESS");
-    return keyByOwner[_owner].expirationTimestamp > 0 ? 1 : 0;
-  }
-
-  /**
-   * Checks if the user has a non-expired key.
-   */
-  function getHasValidKey(address _owner) public view returns (bool) {
-    return keyByOwner[_owner].expirationTimestamp > block.timestamp;
-  }
-
-  /**
-   * @notice Find the tokenId for a given user
-   * @return The tokenId of the NFT, else revert
-   */
-  function getTokenIdFor(
-    address _account
-  ) external view hasKey(_account) returns (uint) {
-    return keyByOwner[_account].tokenId;
-  }
-
-  /**
-   * A function which returns a subset of the keys for this Lock as an array
-   * @param _page the page of key owners requested when faceted by page size
-   * @param _pageSize the number of Key Owners requested per page
-   */
-  function getOwnersByPage(
-    uint _page,
-    uint _pageSize
-  ) public view returns (address[] memory) {
-    require(owners.length > 0, "NO_OUTSTANDING_KEYS");
-    uint pageSize = _pageSize;
-    uint _startIndex = _page * pageSize;
-    uint endOfPageIndex;
-
-    if (_startIndex + pageSize > owners.length) {
-      endOfPageIndex = owners.length;
-      pageSize = owners.length - _startIndex;
-    } else {
-      endOfPageIndex = (_startIndex + pageSize);
-    }
-
-    // new temp in-memory array to hold pageSize number of requested owners:
-    address[] memory ownersByPage = new address[](pageSize);
-    uint pageIndex = 0;
-
-    // Build the requested set of owners into a new temporary array:
-    for (uint i = _startIndex; i < endOfPageIndex; i++) {
-      ownersByPage[pageIndex] = owners[i];
-      pageIndex++;
-    }
-
-    return ownersByPage;
-  }
-
-  /**
-   * Checks if the given address owns the given tokenId.
-   */
-  function isKeyOwner(
-    uint _tokenId,
-    address _owner
-  ) public view returns (bool) {
-    return ownerByTokenId[_tokenId] == _owner;
-  }
-
-  /**
-   * @dev Returns the key's ExpirationTimestamp field for a given owner.
-   * @param _owner address of the user for whom we search the key
-   */
-  function keyExpirationTimestampFor(
-    address _owner
-  ) public view hasKey(_owner) returns (uint timestamp) {
-    return keyByOwner[_owner].expirationTimestamp;
-  }
-
-  /**
-   * Public function which returns the total number of unique owners (both expired
-   * and valid).  This may be larger than totalSupply.
-   */
-  function numberOfOwners() public view returns (uint) {
-    return owners.length;
-  }
-
-  /**
-   * @notice ERC721: Find the owner of an NFT
-   * @return The address of the owner of the NFT, if applicable
-   */
-  function ownerOf(
-    uint _tokenId
-  ) public view isKey(_tokenId) returns (address) {
-    return ownerByTokenId[_tokenId];
-  }
-
-  /**
-   * Assigns the key a new tokenId (from numberOfKeysSold) if it does not already have
-   * one assigned.
-   */
-  function _assignNewTokenId(Key storage _key) internal {
-    if (_key.tokenId == 0) {
-      // This is a brand new owner, else an owner of an expired key buying an extension.
-      // We increment the tokenId counter
-      numberOfKeysSold++;
-      // we assign the incremented `numberOfKeysSold` as the tokenId for the new key
-      _key.tokenId = numberOfKeysSold;
-    }
-  }
-
-  /**
-   * Records the owner of a given tokenId
-   */
-  function _recordOwner(address _owner, uint _tokenId) internal {
-    if (ownerByTokenId[_tokenId] != _owner) {
-      // TODO: this may include duplicate entries
-      owners.push(_owner);
-      // We register the owner of the tokenID
-      ownerByTokenId[_tokenId] = _owner;
-    }
-  }
-
-  /**
-   * Returns the Key struct for the given owner.
-   */
-  function _getKeyFor(address _owner) internal view returns (Key storage) {
-    return keyByOwner[_owner];
-  }
-}
-
-// File contracts/mixins/MixinApproval.sol
-
-pragma solidity 0.5.7;
-
-/**
- * @title Mixin for the Approval related functions needed to meet the ERC721
- * standard.
- * @author HardlyDifficult
- * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
- * separates logically groupings of code to ease readability.
- */
-contract MixinApproval is IERC721, MixinDisableAndDestroy, MixinKeys {
-  // Keeping track of approved transfers
-  // This is a mapping of addresses which have approved
-  // the transfer of a key to another address where their key can be transfered
-  // Note: the approver may actually NOT have a key... and there can only
-  // be a single approved beneficiary
-  // Note 2: for transfer, both addresses will be different
-  // Note 3: for sales (new keys on restricted locks), both addresses will be the same
-  mapping(uint => address) private approved;
-
-  // Keeping track of approved operators for a Key owner.
-  // Since an owner can have up to 1 Key, this is similiar to above
-  // but the approval does not reset when a transfer occurs.
-  mapping(address => mapping(address => bool)) private ownerToOperatorApproved;
-
-  // Ensure that the caller has a key
-  // or that the caller has been approved
-  // for ownership of that key
-  modifier onlyKeyOwnerOrApproved(uint _tokenId) {
-    require(
-      isKeyOwner(_tokenId, msg.sender) ||
-        _isApproved(_tokenId, msg.sender) ||
-        isApprovedForAll(ownerOf(_tokenId), msg.sender),
-      "ONLY_KEY_OWNER_OR_APPROVED"
-    );
-    _;
-  }
-
-  /**
-   * This approves _approved to get ownership of _tokenId.
-   * Note: that since this is used for both purchase and transfer approvals
-   * the approved token may not exist.
-   */
-  function approve(
-    address _approved,
-    uint _tokenId
-  ) external payable onlyIfAlive onlyKeyOwnerOrApproved(_tokenId) {
-    require(msg.sender != _approved, "APPROVE_SELF");
-
-    approved[_tokenId] = _approved;
-    emit Approval(ownerOf(_tokenId), _approved, _tokenId);
-  }
-
-  /**
-   * @dev Sets or unsets the approval of a given operator
-   * An operator is allowed to transfer all tokens of the sender on their behalf
-   * @param _to operator address to set the approval
-   * @param _approved representing the status of the approval to be set
-   */
-  function setApprovalForAll(address _to, bool _approved) external onlyIfAlive {
-    require(_to != msg.sender, "APPROVE_SELF");
-    ownerToOperatorApproved[msg.sender][_to] = _approved;
-    emit ApprovalForAll(msg.sender, _to, _approved);
-  }
-
-  /**
-   * external version
-   * Will return the approved recipient for a key, if any.
-   */
-  function getApproved(uint _tokenId) external view returns (address) {
-    return _getApproved(_tokenId);
-  }
-
-  /**
-   * @dev Tells whether an operator is approved by a given owner
-   * @param _owner owner address which you want to query the approval of
-   * @param _operator operator address which you want to query the approval of
-   * @return bool whether the given operator is approved by the given owner
-   */
-  function isApprovedForAll(
-    address _owner,
-    address _operator
-  ) public view returns (bool) {
-    return ownerToOperatorApproved[_owner][_operator];
-  }
-
-  /**
-   * @dev Checks if the given user is approved to transfer the tokenId.
-   */
-  function _isApproved(
-    uint _tokenId,
-    address _user
-  ) internal view returns (bool) {
-    return approved[_tokenId] == _user;
-  }
-
-  /**
-   * Will return the approved recipient for a key transfer or ownership.
-   * Note: this does not check that a corresponding key
-   * actually exists.
-   */
-  function _getApproved(uint _tokenId) internal view returns (address) {
-    address approvedRecipient = approved[_tokenId];
-    require(approvedRecipient != address(0), "NONE_APPROVED");
-    return approvedRecipient;
-  }
-
-  /**
-   * @dev Function to clear current approval of a given token ID
-   * @param _tokenId uint256 ID of the token to be transferred
-   */
-  function _clearApproval(uint256 _tokenId) internal {
-    if (approved[_tokenId] != address(0)) {
-      approved[_tokenId] = address(0);
-    }
-  }
-}
-
-// File contracts/mixins/MixinGrantKeys.sol
-
-pragma solidity 0.5.7;
-
-/**
- * @title Mixin allowing the Lock owner to grant / gift keys to users.
- * @author HardlyDifficult
- * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
- * separates logically groupings of code to ease readability.
- */
-contract MixinGrantKeys is IERC721, Ownable, MixinKeys {
-  /**
-   * Allows the Lock owner to give a user a key with no charge.
-   */
-  function grantKey(
-    address _recipient,
-    uint _expirationTimestamp
-  ) external onlyOwner {
-    _grantKey(_recipient, _expirationTimestamp);
-  }
-
-  /**
-   * Allows the Lock owner to give a collection of users a key with no charge.
-   * All keys granted have the same expiration date.
-   */
-  function grantKeys(
-    address[] calldata _recipients,
-    uint _expirationTimestamp
-  ) external onlyOwner {
-    for (uint i = 0; i < _recipients.length; i++) {
-      _grantKey(_recipients[i], _expirationTimestamp);
-    }
-  }
-
-  /**
-   * Allows the Lock owner to give a collection of users a key with no charge.
-   * Each key may be assigned a different expiration date.
-   */
-  function grantKeys(
-    address[] calldata _recipients,
-    uint[] calldata _expirationTimestamps
-  ) external onlyOwner {
-    for (uint i = 0; i < _recipients.length; i++) {
-      _grantKey(_recipients[i], _expirationTimestamps[i]);
-    }
-  }
-
-  /**
-   * Give a key to the given user
-   */
-  function _grantKey(address _recipient, uint _expirationTimestamp) private {
-    require(_recipient != address(0), "INVALID_ADDRESS");
-
-    Key storage toKey = _getKeyFor(_recipient);
-    require(
-      _expirationTimestamp > toKey.expirationTimestamp,
-      "ALREADY_OWNS_KEY"
-    );
-
-    _assignNewTokenId(toKey);
-    _recordOwner(_recipient, toKey.tokenId);
-    toKey.expirationTimestamp = _expirationTimestamp;
-
-    // trigger event
-    emit Transfer(
-      address(0), // This is a creation.
-      _recipient,
-      toKey.tokenId
-    );
-  }
-}
-
-// File contracts/mixins/MixinLockMetadata.sol
-
-pragma solidity 0.5.7;
-
-/**
- * @title Mixin for metadata about the Lock.
- * @author HardlyDifficult
- * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
- * separates logically groupings of code to ease readability.
- */
-contract MixinLockMetadata is IERC721, Ownable {
-  /// A descriptive name for a collection of NFTs in this contract
-  string private lockName;
-
-  /**
-   * Allows the Lock owner to assign a descriptive name for this Lock.
-   */
-  function updateLockName(string calldata _lockName) external onlyOwner {
-    lockName = _lockName;
-  }
-
-  /**
-   * @dev Gets the token name
-   * @return string representing the token name
-   */
-  function name() external view returns (string memory) {
-    return lockName;
-  }
-}
-
-// File contracts/mixins/MixinNoFallback.sol
-
-pragma solidity 0.5.7;
-
-/**
- * @title Mixin for the fallback function implementation, which simply reverts.
- * @author HardlyDifficult
- * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
- * separates logically groupings of code to ease readability.
- */
-contract MixinNoFallback {
-  /**
-   * @dev the fallback function should not be used.  This explicitly reverts
-   * to ensure it's never used.
-   */
-  function() external {
-    revert("NO_FALLBACK");
-  }
-}
-
-// File openzeppelin-solidity/contracts/math/SafeMath.sol@v2.1.3
-
-pragma solidity ^0.5.0;
-
-/**
- * @title SafeMath
- * @dev Unsigned math operations with safety checks that revert on error
- */
-library SafeMath {
-  /**
-   * @dev Multiplies two unsigned integers, reverts on overflow.
-   */
-  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
-    // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
-    // benefit is lost if 'b' is also tested.
-    // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
-    if (a == 0) {
-      return 0;
-    }
-
-    uint256 c = a * b;
-    require(c / a == b);
-
-    return c;
-  }
-
-  /**
-   * @dev Integer division of two unsigned integers truncating the quotient, reverts on division by zero.
-   */
-  function div(uint256 a, uint256 b) internal pure returns (uint256) {
-    // Solidity only automatically asserts when dividing by 0
-    require(b > 0);
-    uint256 c = a / b;
-    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
-
-    return c;
-  }
-
-  /**
-   * @dev Subtracts two unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend).
-   */
-  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
-    require(b <= a);
-    uint256 c = a - b;
-
-    return c;
-  }
-
-  /**
-   * @dev Adds two unsigned integers, reverts on overflow.
-   */
-  function add(uint256 a, uint256 b) internal pure returns (uint256) {
-    uint256 c = a + b;
-    require(c >= a);
-
-    return c;
-  }
-
-  /**
-   * @dev Divides two unsigned integers and returns the remainder (unsigned integer modulo),
-   * reverts when dividing by zero.
-   */
-  function mod(uint256 a, uint256 b) internal pure returns (uint256) {
-    require(b != 0);
-    return a % b;
-  }
-}
-
-// File contracts/mixins/MixinPurchase.sol
-
-pragma solidity 0.5.7;
-
-/**
- * @title Mixin for the purchase-related functions.
- * @author HardlyDifficult
- * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
- * separates logically groupings of code to ease readability.
- */
-contract MixinPurchase is
-  MixinFunds,
-  MixinDisableAndDestroy,
-  MixinLockCore,
-  MixinKeys
-{
-  using SafeMath for uint;
-
-  /**
-   * @dev Purchase function, public version, with no referrer.
-   * @param _recipient address of the recipient of the purchased key
-   */
-  function purchaseFor(address _recipient) external payable onlyIfAlive {
-    return _purchaseFor(_recipient, address(0));
-  }
-
-  /**
-   * @dev Purchase function, public version, with referrer.
-   * @param _recipient address of the recipient of the purchased key
-   * @param _referrer address of the user making the referral
-   */
-  function purchaseForFrom(
-    address _recipient,
-    address _referrer
-  ) external payable onlyIfAlive hasValidKey(_referrer) {
-    return _purchaseFor(_recipient, _referrer);
-  }
-
-  /**
-   * @dev Purchase function: this lets a user purchase a key from the lock for another user
-   * @param _recipient address of the recipient of the purchased key
-   * This will fail if
-   *  - the keyReleaseMechanism is private
-   *  - the keyReleaseMechanism is Approved and the recipient has not been previously approved
-   *  - the amount value is smaller than the price
-   *  - the recipient already owns a key
-   * TODO: next version of solidity will allow for message to be added to require.
-   */
-  function _purchaseFor(
-    address _recipient,
-    address _referrer
-  ) private notSoldOut {
-    // solhint-disable-line function-max-lines
-    require(_recipient != address(0), "INVALID_ADDRESS");
-
-    // Let's get the actual price for the key from the Unlock smart contract
-    uint discount;
-    uint tokens;
-    uint inMemoryKeyPrice = keyPrice;
-    (discount, tokens) = unlockProtocol.computeAvailableDiscountFor(
-      _recipient,
-      inMemoryKeyPrice
-    );
-    uint netPrice = inMemoryKeyPrice;
-    if (discount > inMemoryKeyPrice) {
-      netPrice = 0;
-    } else {
-      // SafeSub not required as the if statement already confirmed `inMemoryKeyPrice - discount` cannot underflow
-      netPrice = inMemoryKeyPrice - discount;
-    }
-
-    // We explicitly allow for greater amounts of ETH to allow 'donations'
-    _chargeAtLeast(netPrice);
-
-    // Assign the key
-    Key storage toKey = _getKeyFor(_recipient);
-    uint previousExpiration = toKey.expirationTimestamp;
-    if (previousExpiration < block.timestamp) {
-      _assignNewTokenId(toKey);
-      _recordOwner(_recipient, toKey.tokenId);
-      // SafeAdd is not required here since expirationDuration is capped to a tiny value
-      // (relative to the size of a uint)
-      toKey.expirationTimestamp = block.timestamp + expirationDuration;
-    } else {
-      // This is an existing owner trying to extend their key
-      toKey.expirationTimestamp = previousExpiration.add(expirationDuration);
-    }
-
-    if (discount > 0) {
-      unlockProtocol.recordConsumedDiscount(discount, tokens);
-    }
-
-    unlockProtocol.recordKeyPurchase(netPrice, _referrer);
-
-    // trigger event
-    emit Transfer(
-      address(0), // This is a creation.
-      _recipient,
-      numberOfKeysSold
-    );
-  }
-}
-
-// File contracts/mixins/MixinRefunds.sol
-
-pragma solidity 0.5.7;
-
-contract MixinRefunds is Ownable, MixinFunds, MixinLockCore, MixinKeys {
-  using SafeMath for uint;
-
-  // CancelAndRefund will return funds based on time remaining minus this penalty.
-  // This is calculated as `proRatedRefund * refundPenaltyNumerator / refundPenaltyDenominator`.
-  uint public refundPenaltyNumerator = 1;
-  uint public refundPenaltyDenominator = 10;
-
-  event CancelKey(uint indexed tokenId, address indexed owner, uint refund);
-
-  event RefundPenaltyChanged(
-    uint oldRefundPenaltyNumerator,
-    uint oldRefundPenaltyDenominator,
-    uint refundPenaltyNumerator,
-    uint refundPenaltyDenominator
-  );
-
-  /**
-   * @dev Destroys the user's key and sends a refund based on the amount of time remaining.
-   */
-  function cancelAndRefund() external {
-    Key storage key = _getKeyFor(msg.sender);
-
-    uint refund = _getCancelAndRefundValue(msg.sender);
-
-    emit CancelKey(key.tokenId, msg.sender, refund);
-    // expirationTimestamp is a proxy for hasKey, setting this to `block.timestamp` instead
-    // of 0 so that we can still differentiate hasKey from hasValidKey.
-    key.expirationTimestamp = block.timestamp;
-
-    if (refund > 0) {
-      // Security: doing this last to avoid re-entrancy concerns
-      _transfer(msg.sender, refund);
-    }
-  }
-
-  /**
-   * Allow the owner to change the refund penalty.
-   */
-  function updateRefundPenalty(
-    uint _refundPenaltyNumerator,
-    uint _refundPenaltyDenominator
-  ) external onlyOwner {
-    require(_refundPenaltyDenominator != 0, "INVALID_RATE");
-
-    emit RefundPenaltyChanged(
-      refundPenaltyNumerator,
-      refundPenaltyDenominator,
-      _refundPenaltyNumerator,
-      _refundPenaltyDenominator
-    );
-    refundPenaltyNumerator = _refundPenaltyNumerator;
-    refundPenaltyDenominator = _refundPenaltyDenominator;
-  }
-
-  /**
-   * @dev Determines how much of a refund a key owner would receive if they issued
-   * a cancelAndRefund block.timestamp.
-   * Note that due to the time required to mine a tx, the actual refund amount will be lower
-   * than what the user reads from this call.
-   */
-  function getCancelAndRefundValueFor(
-    address _owner
-  ) external view returns (uint refund) {
-    return _getCancelAndRefundValue(_owner);
-  }
-
-  /**
-   * @dev Determines how much of a refund a key owner would receive if they issued
-   * a cancelAndRefund now.
-   * @param _owner The owner of the key check the refund value for.
-   */
-  function _getCancelAndRefundValue(
-    address _owner
-  ) private view hasValidKey(_owner) returns (uint refund) {
-    Key storage key = _getKeyFor(_owner);
-    // Math: safeSub is not required since `hasValidKey` confirms timeRemaining is positive
-    uint timeRemaining = key.expirationTimestamp - block.timestamp;
-    if (timeRemaining >= expirationDuration) {
-      refund = keyPrice;
-    } else {
-      // Math: using safeMul in case keyPrice or timeRemaining is very large
-      refund = keyPrice.mul(timeRemaining) / expirationDuration;
-    }
-    uint penalty = keyPrice.mul(refundPenaltyNumerator) /
-      refundPenaltyDenominator;
-    if (refund > penalty) {
-      // Math: safeSub is not required since the if confirms this won't underflow
-      refund -= penalty;
-    } else {
-      refund = 0;
-    }
-  }
-}
-
-// File openzeppelin-solidity/contracts/utils/Address.sol@v2.1.3
-
-pragma solidity ^0.5.0;
-
-/**
- * Utility library of inline functions on addresses
- */
-library Address {
-  /**
-   * Returns whether the target address is a contract
-   * @dev This function will return false if invoked during the constructor of a contract,
-   * as the code is not actually created until after the constructor finishes.
-   * @param account address of the account to check
-   * @return whether the target address is a contract
-   */
-  function isContract(address account) internal view returns (bool) {
-    uint256 size;
-    // XXX Currently there is no better way to check if there is a contract in an address
-    // than to check the size of the code at that address.
-    // See https://ethereum.stackexchange.com/a/14016/36603
-    // for more details about how this works.
-    // TODO Check this again before the Serenity release, because all addresses will be
-    // contracts then.
-    // solhint-disable-next-line no-inline-assembly
-    assembly {
-      size := extcodesize(account)
-    }
-    return size > 0;
-  }
-}
-
-// File contracts/mixins/MixinTransfer.sol
-
-pragma solidity 0.5.7;
-
-/**
- * @title Mixin for the transfer-related functions needed to meet the ERC721
- * standard.
- * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
- * separates logically groupings of code to ease readability.
- */
-
-contract MixinTransfer is MixinLockCore, MixinKeys, MixinApproval {
-  using SafeMath for uint;
-  using Address for address;
-
-  event TransferFeeChanged(
-    uint oldTransferFeeNumerator,
-    uint oldTransferFeeDenominator,
-    uint transferFeeNumerator,
-    uint transferFeeDenominator
-  );
-
-  // 0x150b7a02 == bytes4(keccak256('onERC721Received(address,address,uint256,bytes)'))
-  bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;
-
-  // The fee relative to keyPrice to charge when transfering a Key to another account
-  // (potentially on a 0x marketplace).
-  // This is calculated as `keyPrice * transferFeeNumerator / transferFeeDenominator`.
-  // TODO: this value is currently ignored and no fee is charged yet!
-  uint public transferFeeNumerator = 5;
-  uint public transferFeeDenominator = 100;
-
-  /**
-   * This is payable because at some point we want to allow the LOCK to capture a fee on 2ndary
-   * market transactions...
-   */
-  function transferFrom(
-    address _from,
-    address _recipient,
-    uint _tokenId
-  )
-    public
-    payable
-    onlyIfAlive
-    hasValidKey(_from)
-    onlyKeyOwnerOrApproved(_tokenId)
-  {
-    require(_recipient != address(0), "INVALID_ADDRESS");
-
-    Key storage fromKey = _getKeyFor(_from);
-    Key storage toKey = _getKeyFor(_recipient);
-
-    uint previousExpiration = toKey.expirationTimestamp;
-
-    if (toKey.tokenId == 0) {
-      toKey.tokenId = fromKey.tokenId;
-    }
-    _recordOwner(_recipient, toKey.tokenId);
-
-    if (previousExpiration <= block.timestamp) {
-      // The recipient did not have a key, or had a key but it expired. The new expiration is the
-      // sender's key expiration
-      toKey.expirationTimestamp = fromKey.expirationTimestamp;
-    } else {
-      // The recipient has a non expired key. We just add them the corresponding remaining time
-      // SafeSub is not required since the if confirms `previousExpiration - block.timestamp` cannot underflow
-      toKey.expirationTimestamp = fromKey.expirationTimestamp.add(
-        previousExpiration - block.timestamp
-      );
-    }
-
-    // Effectively expiring the key for the previous owner
-    fromKey.expirationTimestamp = block.timestamp;
-
-    // Clear any previous approvals
-    _clearApproval(_tokenId);
-
-    // trigger event
-    emit Transfer(_from, _recipient, _tokenId);
-  }
-
-  /**
-   * @notice Transfers the ownership of an NFT from one address to another address
-   * @dev This works identically to the other function with an extra data parameter,
-   *  except this function just sets data to ''
-   * @param _from The current owner of the NFT
-   * @param _to The new owner
-   * @param _tokenId The NFT to transfer
-   */
-  function safeTransferFrom(
-    address _from,
-    address _to,
-    uint _tokenId
-  ) external payable {
-    safeTransferFrom(_from, _to, _tokenId, "");
-  }
-
-  /**
-   * @notice Transfers the ownership of an NFT from one address to another address.
-   * When transfer is complete, this functions
-   *  checks if `_to` is a smart contract (code size > 0). If so, it calls
-   *  `onERC721Received` on `_to` and throws if the return value is not
-   *  `bytes4(keccak256('onERC721Received(address,address,uint,bytes)'))`.
-   * @param _from The current owner of the NFT
-   * @param _to The new owner
-   * @param _tokenId The NFT to transfer
-   * @param _data Additional data with no specified format, sent in call to `_to`
-   */
-  function safeTransferFrom(
-    address _from,
-    address _to,
-    uint _tokenId,
-    bytes memory _data
-  )
-    public
-    payable
-    onlyIfAlive
-    onlyKeyOwnerOrApproved(_tokenId)
-    hasValidKey(ownerOf(_tokenId))
-  {
-    transferFrom(_from, _to, _tokenId);
-    require(
-      _checkOnERC721Received(_from, _to, _tokenId, _data),
-      "NON_COMPLIANT_ERC721_RECEIVER"
-    );
-  }
-
-  /**
-   * Allow the Lock owner to change the transfer fee.
-   */
-  function updateTransferFee(
-    uint _transferFeeNumerator,
-    uint _transferFeeDenominator
-  ) external onlyOwner {
-    require(_transferFeeDenominator != 0, "INVALID_RATE");
-    emit TransferFeeChanged(
-      transferFeeNumerator,
-      transferFeeDenominator,
-      _transferFeeNumerator,
-      _transferFeeDenominator
-    );
-    transferFeeNumerator = _transferFeeNumerator;
-    transferFeeDenominator = _transferFeeDenominator;
-  }
-
-  /**
-   * @dev Internal function to invoke `onERC721Received` on a target address
-   * The call is not executed if the target address is not a contract
-   * @param from address representing the previous owner of the given token ID
-   * @param to target address that will receive the tokens
-   * @param tokenId uint256 ID of the token to be transferred
-   * @param _data bytes optional data to send along with the call
-   * @return whether the call correctly returned the expected magic value
-   */
-  function _checkOnERC721Received(
-    address from,
-    address to,
-    uint256 tokenId,
-    bytes memory _data
-  ) internal returns (bool) {
-    if (!to.isContract()) {
-      return true;
-    }
-    bytes4 retval = IERC721Receiver(to).onERC721Received(
-      msg.sender,
-      from,
-      tokenId,
-      _data
-    );
-    return (retval == _ERC721_RECEIVED);
-  }
-}
-
-// File contracts/PublicLock.sol
-
-pragma solidity 0.5.7;
-
-/**
- * @title The Lock contract
- * @author Julien Genestoux (unlock-protocol.com)
- * Eventually: implement ERC721.
- * @dev ERC165 allows our contract to be queried to determine whether it implements a given interface.
- * Every ERC-721 compliant contract must implement the ERC165 interface.
- * https://eips.ethereum.org/EIPS/eip-721
- */
-contract PublicLock is
-  MixinNoFallback,
-  ERC721Holder,
-  IERC721,
-  ILockCore,
-  ERC165,
-  Ownable,
-  MixinFunds,
-  MixinDisableAndDestroy,
-  MixinLockCore,
-  MixinKeys,
-  MixinGrantKeys,
-  MixinApproval,
-  MixinLockMetadata,
-  MixinRefunds,
-  MixinPurchase,
-  MixinTransfer
-{
-  constructor(
-    address _owner,
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys
-  )
-    public
-    MixinFunds(_tokenAddress)
-    MixinLockCore(_expirationDuration, _keyPrice, _maxNumberOfKeys, 1)
-  {
-    // registering the interface for erc721 with ERC165.sol using
-    // the ID specified in the standard: https://eips.ethereum.org/EIPS/eip-721
-    _registerInterface(0x80ac58cd);
-    // We must manually initialize Ownable.sol
-    Ownable.initialize(_owner);
-  }
-}
-
-// File contracts/Unlock.sol
-
-pragma solidity 0.5.7;
-
-/**
- * @title The Unlock contract
- * @author Julien Genestoux (unlock-protocol.com)
- * This smart contract has 3 main roles:
- *  1. Distribute discounts to discount token holders
- *  2. Grant dicount tokens to users making referrals and/or publishers granting discounts.
- *  3. Create & deploy Public Lock contracts.
- * In order to achieve these 3 elements, it keeps track of several things such as
- *  a. Deployed locks addresses and balances of discount tokens granted by each lock.
- *  b. The total network product (sum of all key sales, net of discounts)
- *  c. Total of discounts granted
- *  d. Balances of discount tokens, including 'frozen' tokens (which have been used to claim
- * discounts and cannot be used/transfered for a given period)
- *  e. Growth rate of Network Product
- *  f. Growth rate of Discount tokens supply
- * The smart contract has an owner who only can perform the following
- *  - Upgrades
- *  - Change in golden rules (20% of GDP available in discounts, and supply growth rate is at most
- * 50% of GNP growth rate)
- * NOTE: This smart contract is partially implemented for now until enough Locks are deployed and
- * in the wild.
- * The partial implementation includes the following features:
- *  a. Keeping track of deployed locks
- *  b. Keeping track of GNP
- */
-
-/// @dev Must list the direct base contracts in the order from “most base-like” to “most derived”.
-/// https://solidity.readthedocs.io/en/latest/contracts.html#multiple-inheritance-and-linearization
-contract Unlock is MixinNoFallback, IUnlock, Initializable, Ownable {
-  /**
-   * The struct for a lock
-   * We use deployed to keep track of deployments.
-   * This is required because both totalSales and yieldedDiscountTokens are 0 when initialized,
-   * which would be the same values when the lock is not set.
-   */
-  struct LockBalances {
-    bool deployed;
-    uint totalSales; // This is in wei
-    uint yieldedDiscountTokens;
-  }
-
-  modifier onlyFromDeployedLock() {
-    require(locks[msg.sender].deployed, "ONLY_LOCKS");
-    _;
-  }
-
-  uint public grossNetworkProduct;
-
-  uint public totalDiscountGranted;
-
-  // We keep track of deployed locks to ensure that callers are all deployed locks.
-  mapping(address => LockBalances) public locks;
-
-  // Events
-  event NewLock(address indexed lockOwner, address indexed newLockAddress);
-
-  // Use initialize instead of a constructor to support proxies (for upgradeability via zos).
-  function initialize(address _owner) public initializer {
-    // We must manually initialize Ownable.sol
-    Ownable.initialize(_owner);
-  }
-
-  /**
-   * @dev Create lock
-   * This deploys a lock for a creator. It also keeps track of the deployed lock.
-   * @param _tokenAddress set to the ERC20 token address, or 0 for ETH.
-   */
-  function createLock(
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys
-  ) public returns (ILockCore lock) {
-    // create lock
-    ILockCore newLock = new PublicLock(
-      msg.sender,
-      _expirationDuration,
-      _tokenAddress,
-      _keyPrice,
-      _maxNumberOfKeys
-    );
-
-    // Assign the new Lock
-    locks[address(newLock)] = LockBalances({
-      deployed: true,
-      totalSales: 0,
-      yieldedDiscountTokens: 0
-    });
-
-    // trigger event
-    emit NewLock(msg.sender, address(newLock));
-
-    // return the created lock
-    return newLock;
-  }
-
-  /**
-   * This function returns the discount available for a user, when purchasing a
-   * a key from a lock.
-   * This does not modify the state. It returns both the discount and the number of tokens
-   * consumed to grant that discount.
-   * TODO: actually implement this.
-   */
-  function computeAvailableDiscountFor(
-    address _purchaser, // solhint-disable-line no-unused-vars
-    uint _keyPrice // solhint-disable-line no-unused-vars
-  ) public view returns (uint discount, uint tokens) {
-    // TODO: implement me
-    return (0, 0);
-  }
-
-  /**
-   * This function keeps track of the added GDP, as well as grants of discount tokens
-   * to the referrer, if applicable.
-   * The number of discount tokens granted is based on the value of the referal,
-   * the current growth rate and the lock's discount token distribution rate
-   * This function is invoked by a previously deployed lock only.
-   * TODO: actually implement
-   */
-  function recordKeyPurchase(
-    uint _value,
-    address _referrer // solhint-disable-line no-unused-vars
-  ) public onlyFromDeployedLock {
-    // TODO: implement me
-    grossNetworkProduct += _value;
-    return;
-  }
-
-  /**
-   * This function will keep track of consumed discounts by a given user.
-   * It will also grant discount tokens to the creator who is granting the discount based on the
-   * amount of discount and compensation rate.
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordConsumedDiscount(
-    uint _discount,
-    uint _tokens // solhint-disable-line no-unused-vars
-  ) public onlyFromDeployedLock {
-    // TODO: implement me
-    totalDiscountGranted += _discount;
-    return;
-  }
-}
diff --git a/packages/contracts/src/contracts/Unlock/UnlockV2.sol b/packages/contracts/src/contracts/Unlock/UnlockV2.sol
deleted file mode 100644
index 2ddc5ce892b..00000000000
--- a/packages/contracts/src/contracts/Unlock/UnlockV2.sol
+++ /dev/null
@@ -1,2 +0,0 @@
-// Error HH603: Hardhat flatten doesn't support cyclic dependencies.
-// For more info go to https://hardhat.org/HH603 or run Hardhat with --show-stack-traces
\ No newline at end of file
diff --git a/packages/contracts/src/contracts/Unlock/UnlockV3.sol b/packages/contracts/src/contracts/Unlock/UnlockV3.sol
deleted file mode 100644
index 8ce1599daac..00000000000
--- a/packages/contracts/src/contracts/Unlock/UnlockV3.sol
+++ /dev/null
@@ -1,2232 +0,0 @@
-// Sources flattened with hardhat v2.4.1 https://hardhat.org
-
-// File zos-lib/contracts/Initializable.sol@v2.2.3
-
-pragma solidity >=0.4.24 <0.6.0;
-
-/**
- * @title Initializable
- *
- * @dev Helper contract to support initializer functions. To use it, replace
- * the constructor with a function that has the `initializer` modifier.
- * WARNING: Unlike constructors, initializer functions must be manually
- * invoked. This applies both to deploying an Initializable contract, as well
- * as extending an Initializable contract via inheritance.
- * WARNING: When used with inheritance, manual care must be taken to not invoke
- * a parent initializer twice, or ensure that all initializers are idempotent,
- * because this is not dealt with automatically as with constructors.
- */
-contract Initializable {
-  /**
-   * @dev Indicates that the contract has been initialized.
-   */
-  bool private initialized;
-
-  /**
-   * @dev Indicates that the contract is in the process of being initialized.
-   */
-  bool private initializing;
-
-  /**
-   * @dev Modifier to use in the initializer function of a contract.
-   */
-  modifier initializer() {
-    require(
-      initializing || isConstructor() || !initialized,
-      "Contract instance has already been initialized"
-    );
-
-    bool wasInitializing = initializing;
-    initializing = true;
-    initialized = true;
-
-    _;
-
-    initializing = wasInitializing;
-  }
-
-  /// @dev Returns true if and only if the function is running in the constructor
-  function isConstructor() private view returns (bool) {
-    // extcodesize checks the size of the code stored in an address, and
-    // address returns the current address. Since the code is still not
-    // deployed when running a constructor, any checks on its code size will
-    // yield zero, making it an effective way to detect if a contract is
-    // under construction or not.
-    uint256 cs;
-    assembly {
-      cs := extcodesize(address)
-    }
-    return cs == 0;
-  }
-
-  // Reserved storage space to allow for layout changes in the future.
-  uint256[50] private ______gap;
-}
-
-// File openzeppelin-eth/contracts/ownership/Ownable.sol@v2.1.3
-
-pragma solidity ^0.5.0;
-
-/**
- * @title Ownable
- * @dev The Ownable contract has an owner address, and provides basic authorization control
- * functions, this simplifies the implementation of "user permissions".
- */
-contract Ownable is Initializable {
-  address private _owner;
-
-  event OwnershipTransferred(
-    address indexed previousOwner,
-    address indexed newOwner
-  );
-
-  /**
-   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
-   * account.
-   */
-  function initialize(address sender) public initializer {
-    _owner = sender;
-    emit OwnershipTransferred(address(0), _owner);
-  }
-
-  /**
-   * @return the address of the owner.
-   */
-  function owner() public view returns (address) {
-    return _owner;
-  }
-
-  /**
-   * @dev Throws if called by any account other than the owner.
-   */
-  modifier onlyOwner() {
-    require(isOwner());
-    _;
-  }
-
-  /**
-   * @return true if `msg.sender` is the owner of the contract.
-   */
-  function isOwner() public view returns (bool) {
-    return msg.sender == _owner;
-  }
-
-  /**
-   * @dev Allows the current owner to relinquish control of the contract.
-   * @notice Renouncing to ownership will leave the contract without an owner.
-   * It will not be possible to call the functions with the `onlyOwner`
-   * modifier anymore.
-   */
-  function renounceOwnership() public onlyOwner {
-    emit OwnershipTransferred(_owner, address(0));
-    _owner = address(0);
-  }
-
-  /**
-   * @dev Allows the current owner to transfer control of the contract to a newOwner.
-   * @param newOwner The address to transfer ownership to.
-   */
-  function transferOwnership(address newOwner) public onlyOwner {
-    _transferOwnership(newOwner);
-  }
-
-  /**
-   * @dev Transfers control of the contract to a newOwner.
-   * @param newOwner The address to transfer ownership to.
-   */
-  function _transferOwnership(address newOwner) internal {
-    require(newOwner != address(0));
-    emit OwnershipTransferred(_owner, newOwner);
-    _owner = newOwner;
-  }
-
-  uint256[50] private ______gap;
-}
-
-// File contracts/interfaces/IERC721.sol
-
-pragma solidity 0.5.7;
-
-/// @title ERC-721 Non-Fungible Token Standard
-/// @dev See https://eips.ethereum.org/EIPS/eip-721
-///  Note: the ERC-165 identifier for this interface is 0x80ac58cd
-
-interface IERC721 {
-  /// @dev This emits when ownership of any NFT changes by any mechanism.
-  ///  This event emits when NFTs are created (`from` == 0) and destroyed
-  ///  (`to` == 0). Exception: during contract creation, any number of NFTs
-  ///  may be created and assigned without emitting Transfer. At the time of
-  ///  any transfer, the approved address for that NFT (if any) is reset to none.
-  event Transfer(
-    address indexed _from,
-    address indexed _to,
-    uint indexed _tokenId
-  );
-
-  /// @dev This emits when the approved address for an NFT is changed or
-  ///  reaffirmed. The zero address indicates there is no approved address.
-  ///  When a Transfer event emits, this also indicates that the approved
-  ///  address for that NFT (if any) is reset to none.
-  event Approval(
-    address indexed _owner,
-    address indexed _approved,
-    uint indexed _tokenId
-  );
-
-  /// @dev This emits when an operator is enabled or disabled for an owner.
-  ///  The operator can manage all NFTs of the owner.
-  event ApprovalForAll(
-    address indexed _owner,
-    address indexed _operator,
-    bool _approved
-  );
-
-  /// @notice Transfer ownership of an NFT -- THE CALLER IS RESPONSIBLE
-  ///  TO CONFIRM THAT `_to` IS CAPABLE OF RECEIVING NFTS OR ELSE
-  ///  THEY MAY BE PERMANENTLY LOST
-  /// @dev Throws unless `msg.sender` is the current owner, an authorized
-  ///  operator, or the approved address for this NFT. Throws if `_from` is
-  ///  not the current owner. Throws if `_to` is the zero address. Throws if
-  ///  `_tokenId` is not a valid NFT.
-  /// @param _from The current owner of the NFT
-  /// @param _to The new owner
-  /// @param _tokenId The NFT to transfer
-  function transferFrom(
-    address _from,
-    address _to,
-    uint _tokenId
-  ) external payable;
-
-  /// @notice Set or reaffirm the approved address for an NFT
-  /// @dev The zero address indicates there is no approved address.
-  /// @dev Throws unless `msg.sender` is the current NFT owner, or an authorized
-  ///  operator of the current owner.
-  /// @param _approved The new approved NFT controller
-  /// @param _tokenId The NFT to approve
-  function approve(address _approved, uint _tokenId) external payable;
-
-  /// @notice Transfers the ownership of an NFT from one address to another address
-  /// @dev Throws unless `msg.sender` is the current owner, an authorized
-  ///  operator, or the approved address for this NFT. Throws if `_from` is
-  ///  not the current owner. Throws if `_to` is the zero address. Throws if
-  ///  `_tokenId` is not a valid NFT. When transfer is complete, this function
-  ///  checks if `_to` is a smart contract (code size > 0). If so, it calls
-  ///  `onERC721Received` on `_to` and throws if the return value is not
-  ///  `bytes4(keccak256('onERC721Received(address,address,uint,bytes)'))`.
-  /// @param _from The current owner of the NFT
-  /// @param _to The new owner
-  /// @param _tokenId The NFT to transfer
-  /// @param data Additional data with no specified format, sent in call to `_to`
-  function safeTransferFrom(
-    address _from,
-    address _to,
-    uint _tokenId,
-    bytes calldata data
-  ) external payable;
-
-  /// @notice Transfers the ownership of an NFT from one address to another address
-  /// @dev This works identically to the other function with an extra data parameter,
-  ///  except this function just sets data to ''
-  /// @param _from The current owner of the NFT
-  /// @param _to The new owner
-  /// @param _tokenId The NFT to transfer
-  function safeTransferFrom(
-    address _from,
-    address _to,
-    uint _tokenId
-  ) external payable;
-
-  /// @notice Enable or disable approval for a third party ('operator') to manage
-  ///  all of `msg.sender`'s assets.
-  /// @dev Emits the ApprovalForAll event. The contract MUST allow
-  ///  multiple operators per owner.
-  /// @param _operator Address to add to the set of authorized operators.
-  /// @param _approved True if the operator is approved, false to revoke approval
-  function setApprovalForAll(address _operator, bool _approved) external;
-
-  /// @notice Count all NFTs assigned to an owner
-  /// @dev NFTs assigned to the zero address are considered invalid, and this
-  ///  function throws for queries about the zero address.
-  /// @param _owner An address for whom to query the balance
-  /// @return The number of NFTs owned by `_owner`, possibly zero
-  function balanceOf(address _owner) external view returns (uint);
-
-  /// @notice Find the owner of an NFT
-  /// @dev NFTs assigned to zero address are considered invalid, and queries
-  ///  about them do throw.
-  /// @param _tokenId The identifier for an NFT
-  /// @return The address of the owner of the NFT
-  function ownerOf(uint _tokenId) external view returns (address);
-
-  /// @notice Get the approved address for a single NFT
-  /// @dev Throws if `_tokenId` is not a valid NFT
-  /// @param _tokenId The NFT to find the approved address for
-  /// @return The approved address for this NFT, or the zero address if there is none
-  function getApproved(uint _tokenId) external view returns (address);
-
-  /// @notice Query if an address is an authorized operator for another address
-  /// @param _owner The address that owns the NFTs
-  /// @param _operator The address that acts on behalf of the owner
-  /// @return True if `_operator` is an approved operator for `_owner`, false otherwise
-  function isApprovedForAll(
-    address _owner,
-    address _operator
-  ) external view returns (bool);
-
-  /// @notice A descriptive name for a collection of NFTs in this contract
-  function name() external view returns (string memory _name);
-}
-
-// File openzeppelin-solidity/contracts/introspection/IERC165.sol@v2.2.0
-
-pragma solidity ^0.5.2;
-
-/**
- * @title IERC165
- * @dev https://eips.ethereum.org/EIPS/eip-165
- */
-interface IERC165 {
-  /**
-   * @notice Query if a contract implements an interface
-   * @param interfaceId The interface identifier, as specified in ERC-165
-   * @dev Interface identification is specified in ERC-165. This function
-   * uses less than 30,000 gas.
-   */
-  function supportsInterface(bytes4 interfaceId) external view returns (bool);
-}
-
-// File openzeppelin-solidity/contracts/introspection/ERC165.sol@v2.2.0
-
-pragma solidity ^0.5.2;
-
-/**
- * @title ERC165
- * @author Matt Condon (@shrugs)
- * @dev Implements ERC165 using a lookup table.
- */
-contract ERC165 is IERC165 {
-  bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;
-  /*
-   * 0x01ffc9a7 ===
-   *     bytes4(keccak256('supportsInterface(bytes4)'))
-   */
-
-  /**
-   * @dev a mapping of interface id to whether or not it's supported
-   */
-  mapping(bytes4 => bool) private _supportedInterfaces;
-
-  /**
-   * @dev A contract implementing SupportsInterfaceWithLookup
-   * implement ERC165 itself
-   */
-  constructor() internal {
-    _registerInterface(_INTERFACE_ID_ERC165);
-  }
-
-  /**
-   * @dev implement supportsInterface(bytes4) using a lookup table
-   */
-  function supportsInterface(bytes4 interfaceId) external view returns (bool) {
-    return _supportedInterfaces[interfaceId];
-  }
-
-  /**
-   * @dev internal method for registering an interface
-   */
-  function _registerInterface(bytes4 interfaceId) internal {
-    require(interfaceId != 0xffffffff);
-    _supportedInterfaces[interfaceId] = true;
-  }
-}
-
-// File openzeppelin-solidity/contracts/token/ERC721/IERC721Receiver.sol@v2.2.0
-
-pragma solidity ^0.5.2;
-
-/**
- * @title ERC721 token receiver interface
- * @dev Interface for any contract that wants to support safeTransfers
- * from ERC721 asset contracts.
- */
-contract IERC721Receiver {
-  /**
-   * @notice Handle the receipt of an NFT
-   * @dev The ERC721 smart contract calls this function on the recipient
-   * after a `safeTransfer`. This function MUST return the function selector,
-   * otherwise the caller will revert the transaction. The selector to be
-   * returned can be obtained as `this.onERC721Received.selector`. This
-   * function MAY throw to revert and reject the transfer.
-   * Note: the ERC721 contract address is always the message sender.
-   * @param operator The address which called `safeTransferFrom` function
-   * @param from The address which previously owned the token
-   * @param tokenId The NFT identifier which is being transferred
-   * @param data Additional data with no specified format
-   * @return bytes4 `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
-   */
-  function onERC721Received(
-    address operator,
-    address from,
-    uint256 tokenId,
-    bytes memory data
-  ) public returns (bytes4);
-}
-
-// File openzeppelin-solidity/contracts/token/ERC721/ERC721Holder.sol@v2.2.0
-
-pragma solidity ^0.5.2;
-
-contract ERC721Holder is IERC721Receiver {
-  function onERC721Received(
-    address,
-    address,
-    uint256,
-    bytes memory
-  ) public returns (bytes4) {
-    return this.onERC721Received.selector;
-  }
-}
-
-// File openzeppelin-solidity/contracts/token/ERC20/IERC20.sol@v2.2.0
-
-pragma solidity ^0.5.2;
-
-/**
- * @title ERC20 interface
- * @dev see https://eips.ethereum.org/EIPS/eip-20
- */
-interface IERC20 {
-  function transfer(address to, uint256 value) external returns (bool);
-
-  function approve(address spender, uint256 value) external returns (bool);
-
-  function transferFrom(
-    address from,
-    address to,
-    uint256 value
-  ) external returns (bool);
-
-  function totalSupply() external view returns (uint256);
-
-  function balanceOf(address who) external view returns (uint256);
-
-  function allowance(
-    address owner,
-    address spender
-  ) external view returns (uint256);
-
-  event Transfer(address indexed from, address indexed to, uint256 value);
-
-  event Approval(address indexed owner, address indexed spender, uint256 value);
-}
-
-// File contracts/mixins/MixinFunds.sol
-
-pragma solidity 0.5.7;
-
-/**
- * @title An implementation of the money related functions.
- * @author HardlyDifficult (unlock-protocol.com)
- */
-contract MixinFunds {
-  /**
-   * The token-type that this Lock is priced in.  If 0, then use ETH, else this is
-   * a ERC20 token address.
-   */
-  address public tokenAddress;
-
-  constructor(address _tokenAddress) public {
-    require(
-      _tokenAddress == address(0) || IERC20(_tokenAddress).totalSupply() > 0,
-      "INVALID_TOKEN"
-    );
-    tokenAddress = _tokenAddress;
-  }
-
-  /**
-   * Ensures that the msg.sender has paid at least the price stated.
-   *
-   * With ETH, this means the function originally called was `payable` and the
-   * transaction included at least the amount requested.
-   *
-   * Security: be wary of re-entrancy when calling this function.
-   */
-  function _chargeAtLeast(uint _price) internal {
-    if (_price > 0) {
-      if (tokenAddress == address(0)) {
-        require(msg.value >= _price, "NOT_ENOUGH_FUNDS");
-      } else {
-        IERC20 token = IERC20(tokenAddress);
-        uint balanceBefore = token.balanceOf(address(this));
-        token.transferFrom(msg.sender, address(this), _price);
-
-        // There are known bugs in popular ERC20 implements which means we cannot
-        // trust the return value of `transferFrom`.  This require statement ensures
-        // that a transfer occurred.
-        require(
-          token.balanceOf(address(this)) > balanceBefore,
-          "TRANSFER_FAILED"
-        );
-      }
-    }
-  }
-
-  /**
-   * Transfers funds from the contract to the account provided.
-   *
-   * Security: be wary of re-entrancy when calling this function.
-   */
-  function _transfer(address _to, uint _amount) internal {
-    if (_amount > 0) {
-      if (tokenAddress == address(0)) {
-        address(uint160(_to)).transfer(_amount);
-      } else {
-        IERC20 token = IERC20(tokenAddress);
-        uint balanceBefore = token.balanceOf(_to);
-        token.transfer(_to, _amount);
-
-        // There are known bugs in popular ERC20 implements which means we cannot
-        // trust the return value of `transferFrom`.  This require statement ensures
-        // that a transfer occurred.
-        require(token.balanceOf(_to) > balanceBefore, "TRANSFER_FAILED");
-      }
-    }
-  }
-
-  /**
-   * Gets the current balance of the account provided.
-   */
-  function _getBalance(address _account) internal view returns (uint) {
-    if (tokenAddress == address(0)) {
-      return _account.balance;
-    } else {
-      return IERC20(tokenAddress).balanceOf(_account);
-    }
-  }
-}
-
-// File contracts/mixins/MixinDisableAndDestroy.sol
-
-pragma solidity 0.5.7;
-
-/**
- * @title Mixin allowing the Lock owner to disable a Lock (preventing new purchases)
- * and then destroy it.
- * @author HardlyDifficult
- * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
- * separates logically groupings of code to ease readability.
- */
-contract MixinDisableAndDestroy is IERC721, Ownable, MixinFunds {
-  // Used to disable payable functions when deprecating an old lock
-  bool public isAlive;
-
-  event Destroy(uint balance, address indexed owner);
-
-  event Disable();
-
-  constructor() internal {
-    isAlive = true;
-  }
-
-  // Only allow usage when contract is Alive
-  modifier onlyIfAlive() {
-    require(isAlive, "LOCK_DEPRECATED");
-    _;
-  }
-
-  /**
-   * @dev Used to disable lock before migrating keys and/or destroying contract
-   */
-  function disableLock() external onlyOwner onlyIfAlive {
-    emit Disable();
-    isAlive = false;
-  }
-
-  /**
-   * @dev Used to clean up old lock contracts from the blockchain
-   * TODO: add a check to ensure all keys are INVALID!
-   */
-  function destroyLock() external onlyOwner {
-    require(isAlive == false, "DISABLE_FIRST");
-
-    emit Destroy(address(this).balance, msg.sender);
-
-    // this will send any ETH or ERC20 held by the lock to the owner
-    _transfer(msg.sender, _getBalance(address(this)));
-    selfdestruct(msg.sender);
-
-    // Note we don't clean up the `locks` data in Unlock.sol as it should not be necessary
-    // and leaves some data behind ('Unlock.LockBalances') which may be helpful.
-  }
-}
-
-// File contracts/interfaces/IUnlock.sol
-
-pragma solidity 0.5.7;
-
-/**
- * @title The Unlock Interface
- **/
-
-interface IUnlock {
-  // Events
-  event NewLock(address indexed lockOwner, address indexed newLockAddress);
-
-  event NewTokenURI(string tokenURI);
-
-  event NewGlobalTokenSymbol(string tokenSymbol);
-
-  // Use initialize instead of a constructor to support proxies (for upgradeability via zos).
-  function initialize(address _owner) external;
-
-  /**
-   * @dev Create lock
-   * This deploys a lock for a creator. It also keeps track of the deployed lock.
-   * @param _tokenAddress set to the ERC20 token address, or 0 for ETH.
-   */
-  function createLock(
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys,
-    string calldata _lockName
-  ) external;
-
-  /**
-   * This function keeps track of the added GDP, as well as grants of discount tokens
-   * to the referrer, if applicable.
-   * The number of discount tokens granted is based on the value of the referal,
-   * the current growth rate and the lock's discount token distribution rate
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordKeyPurchase(
-    uint _value,
-    address _referrer // solhint-disable-line no-unused-vars
-  ) external;
-
-  /**
-   * This function will keep track of consumed discounts by a given user.
-   * It will also grant discount tokens to the creator who is granting the discount based on the
-   * amount of discount and compensation rate.
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordConsumedDiscount(
-    uint _discount,
-    uint _tokens // solhint-disable-line no-unused-vars
-  ) external;
-
-  /**
-   * This function returns the discount available for a user, when purchasing a
-   * a key from a lock.
-   * This does not modify the state. It returns both the discount and the number of tokens
-   * consumed to grant that discount.
-   */
-  function computeAvailableDiscountFor(
-    address _purchaser, // solhint-disable-line no-unused-vars
-    uint _keyPrice // solhint-disable-line no-unused-vars
-  ) external view returns (uint discount, uint tokens);
-
-  // Function to read the globalTokenURI field.
-  function getGlobalBaseTokenURI() external view returns (string memory);
-
-  /** Function to set the globalTokenURI field.
-   *  Should throw if called by other than owner
-   */
-  function setGlobalBaseTokenURI(string calldata _URI) external;
-
-  // Function to read the globalTokenSymbol field.
-  function getGlobalTokenSymbol() external view returns (string memory);
-
-  /** Function to set the globalTokenSymbol field.
-   *  Should throw if called by other than owner.
-   */
-  function setGlobalTokenSymbol(string calldata _symbol) external;
-}
-
-// File contracts/mixins/MixinLockCore.sol
-
-pragma solidity 0.5.7;
-
-/**
- * @title Mixin for core lock data and functions.
- * @author HardlyDifficult
- * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
- * separates logically groupings of code to ease readability.
- */
-contract MixinLockCore is Ownable, MixinFunds, MixinDisableAndDestroy {
-  event PriceChanged(uint oldKeyPrice, uint keyPrice);
-
-  event Withdrawal(address indexed _sender, uint _amount);
-
-  // Unlock Protocol address
-  // TODO: should we make that private/internal?
-  IUnlock public unlockProtocol;
-
-  // Duration in seconds for which the keys are valid, after creation
-  // should we take a smaller type use less gas?
-  // TODO: add support for a timestamp instead of duration
-  uint public expirationDuration;
-
-  // price in wei of the next key
-  // TODO: allow support for a keyPriceCalculator which could set prices dynamically
-  uint public keyPrice;
-
-  // Max number of keys sold if the keyReleaseMechanism is public
-  uint public maxNumberOfKeys;
-
-  // A count of how many new key purchases there have been
-  uint public numberOfKeysSold;
-
-  // Ensure that the Lock has not sold all of its keys.
-  modifier notSoldOut() {
-    require(maxNumberOfKeys > numberOfKeysSold, "LOCK_SOLD_OUT");
-    _;
-  }
-
-  constructor(
-    uint _expirationDuration,
-    uint _keyPrice,
-    uint _maxNumberOfKeys
-  ) internal {
-    require(
-      _expirationDuration <= 100 * 365 * 24 * 60 * 60,
-      "MAX_EXPIRATION_100_YEARS"
-    );
-    unlockProtocol = IUnlock(msg.sender); // Make sure we link back to Unlock's smart contract.
-    expirationDuration = _expirationDuration;
-    keyPrice = _keyPrice;
-    maxNumberOfKeys = _maxNumberOfKeys;
-  }
-
-  /**
-   * @dev Called by owner to withdraw all funds from the lock.
-   * TODO: consider allowing anybody to trigger this as long as it goes to owner anyway?
-   */
-  function withdraw() external onlyOwner {
-    uint balance = _getBalance(address(this));
-    require(balance > 0, "NOT_ENOUGH_FUNDS");
-    // Security: re-entrancy not a risk as this is the last line of an external function
-    _withdraw(balance);
-  }
-
-  /**
-   * @dev Called by owner to partially withdraw funds from the lock.
-   * TODO: consider allowing anybody to trigger this as long as it goes to owner anyway?
-   */
-  function partialWithdraw(uint _amount) external onlyOwner {
-    require(_amount > 0, "GREATER_THAN_ZERO");
-    uint balance = _getBalance(address(this));
-    require(balance >= _amount, "NOT_ENOUGH_FUNDS");
-    // Security: re-entrancy not a risk as this is the last line of an external function
-    _withdraw(_amount);
-  }
-
-  /**
-   * A function which lets the owner of the lock to change the price for future purchases.
-   */
-  function updateKeyPrice(uint _keyPrice) external onlyOwner onlyIfAlive {
-    uint oldKeyPrice = keyPrice;
-    keyPrice = _keyPrice;
-    emit PriceChanged(oldKeyPrice, keyPrice);
-  }
-
-  /**
-   * Public function which returns the total number of unique keys sold (both
-   * expired and valid)
-   */
-  function totalSupply() public view returns (uint) {
-    return numberOfKeysSold;
-  }
-
-  /**
-   * @dev private version of the withdraw function which handles all withdrawals from the lock.
-   *
-   * Security: Be wary of re-entrancy when calling this.
-   */
-  function _withdraw(uint _amount) private {
-    _transfer(Ownable.owner(), _amount);
-    emit Withdrawal(msg.sender, _amount);
-  }
-}
-
-// File contracts/mixins/MixinKeys.sol
-
-pragma solidity 0.5.7;
-
-/**
- * @title Mixin for managing `Key` data.
- * @author HardlyDifficult
- * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
- * separates logically groupings of code to ease readability.
- */
-contract MixinKeys is Ownable, MixinLockCore {
-  // The struct for a key
-  struct Key {
-    uint tokenId;
-    uint expirationTimestamp;
-  }
-
-  // Called when the Lock owner expires a user's Key
-  event ExpireKey(uint tokenId);
-
-  // Keys
-  // Each owner can have at most exactly one key
-  // TODO: could we use public here? (this could be confusing though because it getter will
-  // return 0 values when missing a key)
-  mapping(address => Key) private keyByOwner;
-
-  // Each tokenId can have at most exactly one owner at a time.
-  // Returns 0 if the token does not exist
-  // TODO: once we decouple tokenId from owner address (incl in js), then we can consider
-  // merging this with numberOfKeysSold into an array instead.
-  mapping(uint => address) private ownerByTokenId;
-
-  // Addresses of owners are also stored in an array.
-  // Addresses are never removed by design to avoid abuses around referals
-  address[] public owners;
-
-  // Ensures that an owner owns or has owned a key in the past
-  modifier ownsOrHasOwnedKey(address _owner) {
-    require(keyByOwner[_owner].expirationTimestamp > 0, "HAS_NEVER_OWNED_KEY");
-    _;
-  }
-
-  // Ensures that an owner has a valid key
-  modifier hasValidKey(address _owner) {
-    require(getHasValidKey(_owner), "KEY_NOT_VALID");
-    _;
-  }
-
-  // Ensures that a key has an owner
-  modifier isKey(uint _tokenId) {
-    require(ownerByTokenId[_tokenId] != address(0), "NO_SUCH_KEY");
-    _;
-  }
-
-  // Ensure that the caller owns the key
-  modifier onlyKeyOwner(uint _tokenId) {
-    require(isKeyOwner(_tokenId, msg.sender), "ONLY_KEY_OWNER");
-    _;
-  }
-
-  /**
-   * A function which lets the owner of the lock expire a users' key.
-   */
-  function expireKeyFor(address _owner) public onlyOwner hasValidKey(_owner) {
-    Key storage key = keyByOwner[_owner];
-    key.expirationTimestamp = block.timestamp; // Effectively expiring the key
-    emit ExpireKey(key.tokenId);
-  }
-
-  /**
-   * In the specific case of a Lock, each owner can own only at most 1 key.
-   * @return The number of NFTs owned by `_owner`, either 0 or 1.
-   */
-  function balanceOf(address _owner) external view returns (uint) {
-    require(_owner != address(0), "INVALID_ADDRESS");
-    return getHasValidKey(_owner) ? 1 : 0;
-  }
-
-  /**
-   * Checks if the user has a non-expired key.
-   */
-  function getHasValidKey(address _owner) public view returns (bool) {
-    return keyByOwner[_owner].expirationTimestamp > block.timestamp;
-  }
-
-  /**
-   * @notice Find the tokenId for a given user
-   * @return The tokenId of the NFT, else revert
-   */
-  function getTokenIdFor(
-    address _account
-  ) external view hasValidKey(_account) returns (uint) {
-    return keyByOwner[_account].tokenId;
-  }
-
-  /**
-   * A function which returns a subset of the keys for this Lock as an array
-   * @param _page the page of key owners requested when faceted by page size
-   * @param _pageSize the number of Key Owners requested per page
-   */
-  function getOwnersByPage(
-    uint _page,
-    uint _pageSize
-  ) public view returns (address[] memory) {
-    require(owners.length > 0, "NO_OUTSTANDING_KEYS");
-    uint pageSize = _pageSize;
-    uint _startIndex = _page * pageSize;
-    uint endOfPageIndex;
-
-    if (_startIndex + pageSize > owners.length) {
-      endOfPageIndex = owners.length;
-      pageSize = owners.length - _startIndex;
-    } else {
-      endOfPageIndex = (_startIndex + pageSize);
-    }
-
-    // new temp in-memory array to hold pageSize number of requested owners:
-    address[] memory ownersByPage = new address[](pageSize);
-    uint pageIndex = 0;
-
-    // Build the requested set of owners into a new temporary array:
-    for (uint i = _startIndex; i < endOfPageIndex; i++) {
-      ownersByPage[pageIndex] = owners[i];
-      pageIndex++;
-    }
-
-    return ownersByPage;
-  }
-
-  /**
-   * Checks if the given address owns the given tokenId.
-   */
-  function isKeyOwner(
-    uint _tokenId,
-    address _owner
-  ) public view returns (bool) {
-    return ownerByTokenId[_tokenId] == _owner;
-  }
-
-  /**
-   * @dev Returns the key's ExpirationTimestamp field for a given owner.
-   * @param _owner address of the user for whom we search the key
-   */
-  function keyExpirationTimestampFor(
-    address _owner
-  ) public view ownsOrHasOwnedKey(_owner) returns (uint timestamp) {
-    return keyByOwner[_owner].expirationTimestamp;
-  }
-
-  /**
-   * Public function which returns the total number of unique owners (both expired
-   * and valid).  This may be larger than totalSupply.
-   */
-  function numberOfOwners() public view returns (uint) {
-    return owners.length;
-  }
-
-  /**
-   * @notice ERC721: Find the owner of an NFT
-   * @return The address of the owner of the NFT, if applicable
-   */
-  function ownerOf(
-    uint _tokenId
-  ) public view isKey(_tokenId) returns (address) {
-    return ownerByTokenId[_tokenId];
-  }
-
-  /**
-   * Assigns the key a new tokenId (from numberOfKeysSold) if it does not already have
-   * one assigned.
-   */
-  function _assignNewTokenId(Key storage _key) internal {
-    if (_key.tokenId == 0) {
-      // This is a brand new owner, else an owner of an expired key buying an extension.
-      // We increment the tokenId counter
-      numberOfKeysSold++;
-      // we assign the incremented `numberOfKeysSold` as the tokenId for the new key
-      _key.tokenId = numberOfKeysSold;
-    }
-  }
-
-  /**
-   * Records the owner of a given tokenId
-   */
-  function _recordOwner(address _owner, uint _tokenId) internal {
-    if (ownerByTokenId[_tokenId] != _owner) {
-      // TODO: this may include duplicate entries
-      owners.push(_owner);
-      // We register the owner of the tokenID
-      ownerByTokenId[_tokenId] = _owner;
-    }
-  }
-
-  /**
-   * Returns the Key struct for the given owner.
-   */
-  function _getKeyFor(address _owner) internal view returns (Key storage) {
-    return keyByOwner[_owner];
-  }
-}
-
-// File contracts/mixins/MixinApproval.sol
-
-pragma solidity 0.5.7;
-
-/**
- * @title Mixin for the Approval related functions needed to meet the ERC721
- * standard.
- * @author HardlyDifficult
- * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
- * separates logically groupings of code to ease readability.
- */
-contract MixinApproval is IERC721, MixinDisableAndDestroy, MixinKeys {
-  // Keeping track of approved transfers
-  // This is a mapping of addresses which have approved
-  // the transfer of a key to another address where their key can be transfered
-  // Note: the approver may actually NOT have a key... and there can only
-  // be a single approved beneficiary
-  // Note 2: for transfer, both addresses will be different
-  // Note 3: for sales (new keys on restricted locks), both addresses will be the same
-  mapping(uint => address) private approved;
-
-  // Keeping track of approved operators for a Key owner.
-  // Since an owner can have up to 1 Key, this is similiar to above
-  // but the approval does not reset when a transfer occurs.
-  mapping(address => mapping(address => bool)) private ownerToOperatorApproved;
-
-  // Ensure that the caller has a key
-  // or that the caller has been approved
-  // for ownership of that key
-  modifier onlyKeyOwnerOrApproved(uint _tokenId) {
-    require(
-      isKeyOwner(_tokenId, msg.sender) ||
-        _isApproved(_tokenId, msg.sender) ||
-        isApprovedForAll(ownerOf(_tokenId), msg.sender),
-      "ONLY_KEY_OWNER_OR_APPROVED"
-    );
-    _;
-  }
-
-  /**
-   * This approves _approved to get ownership of _tokenId.
-   * Note: that since this is used for both purchase and transfer approvals
-   * the approved token may not exist.
-   */
-  function approve(
-    address _approved,
-    uint _tokenId
-  ) external payable onlyIfAlive onlyKeyOwnerOrApproved(_tokenId) {
-    require(msg.sender != _approved, "APPROVE_SELF");
-
-    approved[_tokenId] = _approved;
-    emit Approval(ownerOf(_tokenId), _approved, _tokenId);
-  }
-
-  /**
-   * @dev Sets or unsets the approval of a given operator
-   * An operator is allowed to transfer all tokens of the sender on their behalf
-   * @param _to operator address to set the approval
-   * @param _approved representing the status of the approval to be set
-   */
-  function setApprovalForAll(address _to, bool _approved) external onlyIfAlive {
-    require(_to != msg.sender, "APPROVE_SELF");
-    ownerToOperatorApproved[msg.sender][_to] = _approved;
-    emit ApprovalForAll(msg.sender, _to, _approved);
-  }
-
-  /**
-   * external version
-   * Will return the approved recipient for a key, if any.
-   */
-  function getApproved(uint _tokenId) external view returns (address) {
-    return _getApproved(_tokenId);
-  }
-
-  /**
-   * @dev Tells whether an operator is approved by a given owner
-   * @param _owner owner address which you want to query the approval of
-   * @param _operator operator address which you want to query the approval of
-   * @return bool whether the given operator is approved by the given owner
-   */
-  function isApprovedForAll(
-    address _owner,
-    address _operator
-  ) public view returns (bool) {
-    return ownerToOperatorApproved[_owner][_operator];
-  }
-
-  /**
-   * @dev Checks if the given user is approved to transfer the tokenId.
-   */
-  function _isApproved(
-    uint _tokenId,
-    address _user
-  ) internal view returns (bool) {
-    return approved[_tokenId] == _user;
-  }
-
-  /**
-   * Will return the approved recipient for a key transfer or ownership.
-   * Note: this does not check that a corresponding key
-   * actually exists.
-   */
-  function _getApproved(uint _tokenId) internal view returns (address) {
-    address approvedRecipient = approved[_tokenId];
-    require(approvedRecipient != address(0), "NONE_APPROVED");
-    return approvedRecipient;
-  }
-
-  /**
-   * @dev Function to clear current approval of a given token ID
-   * @param _tokenId uint256 ID of the token to be transferred
-   */
-  function _clearApproval(uint256 _tokenId) internal {
-    if (approved[_tokenId] != address(0)) {
-      approved[_tokenId] = address(0);
-    }
-  }
-}
-
-// File contracts/mixins/MixinGrantKeys.sol
-
-pragma solidity 0.5.7;
-
-/**
- * @title Mixin allowing the Lock owner to grant / gift keys to users.
- * @author HardlyDifficult
- * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
- * separates logically groupings of code to ease readability.
- */
-contract MixinGrantKeys is IERC721, Ownable, MixinKeys {
-  /**
-   * Allows the Lock owner to give a user a key with no charge.
-   */
-  function grantKey(
-    address _recipient,
-    uint _expirationTimestamp
-  ) external onlyOwner {
-    _grantKey(_recipient, _expirationTimestamp);
-  }
-
-  /**
-   * Allows the Lock owner to give a collection of users a key with no charge.
-   * All keys granted have the same expiration date.
-   */
-  function grantKeys(
-    address[] calldata _recipients,
-    uint _expirationTimestamp
-  ) external onlyOwner {
-    for (uint i = 0; i < _recipients.length; i++) {
-      _grantKey(_recipients[i], _expirationTimestamp);
-    }
-  }
-
-  /**
-   * Allows the Lock owner to give a collection of users a key with no charge.
-   * Each key may be assigned a different expiration date.
-   */
-  function grantKeys(
-    address[] calldata _recipients,
-    uint[] calldata _expirationTimestamps
-  ) external onlyOwner {
-    for (uint i = 0; i < _recipients.length; i++) {
-      _grantKey(_recipients[i], _expirationTimestamps[i]);
-    }
-  }
-
-  /**
-   * Give a key to the given user
-   */
-  function _grantKey(address _recipient, uint _expirationTimestamp) private {
-    require(_recipient != address(0), "INVALID_ADDRESS");
-
-    Key storage toKey = _getKeyFor(_recipient);
-    require(
-      _expirationTimestamp > toKey.expirationTimestamp,
-      "ALREADY_OWNS_KEY"
-    );
-
-    _assignNewTokenId(toKey);
-    _recordOwner(_recipient, toKey.tokenId);
-    toKey.expirationTimestamp = _expirationTimestamp;
-
-    // trigger event
-    emit Transfer(
-      address(0), // This is a creation.
-      _recipient,
-      toKey.tokenId
-    );
-  }
-}
-
-// File contracts/UnlockUtils.sol
-
-pragma solidity 0.5.7;
-
-// This contract provides some utility methods for use with the unlock protocol smart contracts.
-// Borrowed from:
-// https://github.com/oraclize/ethereum-api/blob/master/oraclizeAPI_0.5.sol#L943
-
-contract UnlockUtils {
-  function strConcat(
-    string memory _a,
-    string memory _b,
-    string memory _c,
-    string memory _d
-  ) public pure returns (string memory _concatenatedString) {
-    bytes memory _ba = bytes(_a);
-    bytes memory _bb = bytes(_b);
-    bytes memory _bc = bytes(_c);
-    bytes memory _bd = bytes(_d);
-    string memory abcd = new string(
-      _ba.length + _bb.length + _bc.length + _bd.length
-    );
-    bytes memory babcd = bytes(abcd);
-    uint k = 0;
-    uint i = 0;
-    for (i = 0; i < _ba.length; i++) {
-      babcd[k++] = _ba[i];
-    }
-    for (i = 0; i < _bb.length; i++) {
-      babcd[k++] = _bb[i];
-    }
-    for (i = 0; i < _bc.length; i++) {
-      babcd[k++] = _bc[i];
-    }
-    for (i = 0; i < _bd.length; i++) {
-      babcd[k++] = _bd[i];
-    }
-    return string(babcd);
-  }
-
-  function uint2Str(uint _i) public pure returns (string memory _uintAsString) {
-    // make a copy of the param to avoid security/no-assign-params error
-    uint c = _i;
-    if (_i == 0) {
-      return "0";
-    }
-    uint j = _i;
-    uint len;
-    while (j != 0) {
-      len++;
-      j /= 10;
-    }
-    bytes memory bstr = new bytes(len);
-    uint k = len - 1;
-    while (c != 0) {
-      bstr[k--] = bytes1(uint8(48 + (c % 10)));
-      c /= 10;
-    }
-    return string(bstr);
-  }
-
-  function address2Str(address _addr) public pure returns (string memory) {
-    bytes32 value = bytes32(uint256(_addr));
-    bytes memory alphabet = "0123456789abcdef";
-    bytes memory str = new bytes(42);
-    str[0] = "0";
-    str[1] = "x";
-    for (uint i = 0; i < 20; i++) {
-      str[2 + i * 2] = alphabet[uint8(value[i + 12] >> 4)];
-      str[3 + i * 2] = alphabet[uint8(value[i + 12] & 0x0f)];
-    }
-    return string(str);
-  }
-}
-
-// File contracts/mixins/MixinLockMetadata.sol
-
-pragma solidity 0.5.7;
-
-/**
- * @title Mixin for metadata about the Lock.
- * @author HardlyDifficult
- * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
- * separates logically groupings of code to ease readability.
- */
-contract MixinLockMetadata is
-  IERC721,
-  ERC165,
-  Ownable,
-  MixinLockCore,
-  UnlockUtils,
-  MixinKeys
-{
-  /// A descriptive name for a collection of NFTs in this contract.Defaults to "Unlock-Protocol" but is settable by lock owner
-  string private lockName;
-
-  /// An abbreviated name for NFTs in this contract. Defaults to "KEY" but is settable by lock owner
-  string private lockSymbol;
-
-  // the base Token URI for this Lock. If not set by lock owner, the global URI stored in Unlock is used.
-  string private baseTokenURI;
-
-  event NewLockSymbol(string symbol);
-
-  constructor(string memory _lockName) internal {
-    lockName = _lockName;
-    // registering the optional erc721 metadata interface with ERC165.sol using
-    // the ID specified in the standard: https://eips.ethereum.org/EIPS/eip-721
-    _registerInterface(0x5b5e139f);
-  }
-
-  /**
-   * Allows the Lock owner to assign a descriptive name for this Lock.
-   */
-  function updateLockName(string calldata _lockName) external onlyOwner {
-    lockName = _lockName;
-  }
-
-  /**
-   * @dev Gets the token name
-   * @return string representing the token name
-   */
-  function name() external view returns (string memory) {
-    return lockName;
-  }
-
-  /**
-   * Allows the Lock owner to assign a Symbol for this Lock.
-   */
-  function updateLockSymbol(string calldata _lockSymbol) external onlyOwner {
-    lockSymbol = _lockSymbol;
-    emit NewLockSymbol(_lockSymbol);
-  }
-
-  /**
-   * @dev Gets the token symbol
-   * @return string representing the token name
-   */
-  function symbol() external view returns (string memory) {
-    if (bytes(lockSymbol).length == 0) {
-      return unlockProtocol.getGlobalTokenSymbol();
-    } else {
-      return lockSymbol;
-    }
-  }
-
-  /**
-   * Allows the Lock owner to update the baseTokenURI for this Lock.
-   */
-  function setBaseTokenURI(string calldata _baseTokenURI) external onlyOwner {
-    baseTokenURI = _baseTokenURI;
-  }
-
-  /**  @notice A distinct Uniform Resource Identifier (URI) for a given asset.
-   * @dev Throws if `_tokenId` is not a valid NFT. URIs are defined in RFC
-   *  3986. The URI may point to a JSON file that conforms to the "ERC721
-   *  Metadata JSON Schema".
-   * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
-   */
-  function tokenURI(
-    uint256 _tokenId
-  ) external view isKey(_tokenId) returns (string memory) {
-    string memory URI;
-    if (bytes(baseTokenURI).length == 0) {
-      URI = unlockProtocol.getGlobalBaseTokenURI();
-    } else {
-      URI = baseTokenURI;
-    }
-
-    return
-      UnlockUtils.strConcat(
-        URI,
-        UnlockUtils.address2Str(address(this)),
-        "/",
-        UnlockUtils.uint2Str(_tokenId)
-      );
-  }
-}
-
-// File contracts/mixins/MixinNoFallback.sol
-
-pragma solidity 0.5.7;
-
-/**
- * @title Mixin for the fallback function implementation, which simply reverts.
- * @author HardlyDifficult
- * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
- * separates logically groupings of code to ease readability.
- */
-contract MixinNoFallback {
-  /**
-   * @dev the fallback function should not be used.  This explicitly reverts
-   * to ensure it's never used.
-   */
-  function() external {
-    revert("NO_FALLBACK");
-  }
-}
-
-// File openzeppelin-solidity/contracts/math/SafeMath.sol@v2.2.0
-
-pragma solidity ^0.5.2;
-
-/**
- * @title SafeMath
- * @dev Unsigned math operations with safety checks that revert on error
- */
-library SafeMath {
-  /**
-   * @dev Multiplies two unsigned integers, reverts on overflow.
-   */
-  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
-    // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
-    // benefit is lost if 'b' is also tested.
-    // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
-    if (a == 0) {
-      return 0;
-    }
-
-    uint256 c = a * b;
-    require(c / a == b);
-
-    return c;
-  }
-
-  /**
-   * @dev Integer division of two unsigned integers truncating the quotient, reverts on division by zero.
-   */
-  function div(uint256 a, uint256 b) internal pure returns (uint256) {
-    // Solidity only automatically asserts when dividing by 0
-    require(b > 0);
-    uint256 c = a / b;
-    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
-
-    return c;
-  }
-
-  /**
-   * @dev Subtracts two unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend).
-   */
-  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
-    require(b <= a);
-    uint256 c = a - b;
-
-    return c;
-  }
-
-  /**
-   * @dev Adds two unsigned integers, reverts on overflow.
-   */
-  function add(uint256 a, uint256 b) internal pure returns (uint256) {
-    uint256 c = a + b;
-    require(c >= a);
-
-    return c;
-  }
-
-  /**
-   * @dev Divides two unsigned integers and returns the remainder (unsigned integer modulo),
-   * reverts when dividing by zero.
-   */
-  function mod(uint256 a, uint256 b) internal pure returns (uint256) {
-    require(b != 0);
-    return a % b;
-  }
-}
-
-// File contracts/mixins/MixinPurchase.sol
-
-pragma solidity 0.5.7;
-
-/**
- * @title Mixin for the purchase-related functions.
- * @author HardlyDifficult
- * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
- * separates logically groupings of code to ease readability.
- */
-contract MixinPurchase is
-  MixinFunds,
-  MixinDisableAndDestroy,
-  MixinLockCore,
-  MixinKeys
-{
-  using SafeMath for uint;
-
-  /**
-   * @dev Purchase function, public version, with no referrer.
-   * @param _recipient address of the recipient of the purchased key
-   */
-  function purchaseFor(address _recipient) external payable onlyIfAlive {
-    return _purchaseFor(_recipient, address(0));
-  }
-
-  /**
-   * @dev Purchase function, public version, with referrer.
-   * @param _recipient address of the recipient of the purchased key
-   * @param _referrer address of the user making the referral
-   */
-  function purchaseForFrom(
-    address _recipient,
-    address _referrer
-  ) external payable onlyIfAlive hasValidKey(_referrer) {
-    return _purchaseFor(_recipient, _referrer);
-  }
-
-  /**
-   * @dev Purchase function: this lets a user purchase a key from the lock for another user
-   * @param _recipient address of the recipient of the purchased key
-   * This will fail if
-   *  - the keyReleaseMechanism is private
-   *  - the keyReleaseMechanism is Approved and the recipient has not been previously approved
-   *  - the amount value is smaller than the price
-   *  - the recipient already owns a key
-   * TODO: next version of solidity will allow for message to be added to require.
-   */
-  function _purchaseFor(
-    address _recipient,
-    address _referrer
-  ) private notSoldOut {
-    // solhint-disable-line function-max-lines
-    require(_recipient != address(0), "INVALID_ADDRESS");
-
-    // Let's get the actual price for the key from the Unlock smart contract
-    uint discount;
-    uint tokens;
-    uint inMemoryKeyPrice = keyPrice;
-    (discount, tokens) = unlockProtocol.computeAvailableDiscountFor(
-      _recipient,
-      inMemoryKeyPrice
-    );
-    uint netPrice = inMemoryKeyPrice;
-    if (discount > inMemoryKeyPrice) {
-      netPrice = 0;
-    } else {
-      // SafeSub not required as the if statement already confirmed `inMemoryKeyPrice - discount` cannot underflow
-      netPrice = inMemoryKeyPrice - discount;
-    }
-
-    // We explicitly allow for greater amounts of ETH to allow 'donations'
-    _chargeAtLeast(netPrice);
-
-    // Assign the key
-    Key storage toKey = _getKeyFor(_recipient);
-    uint previousExpiration = toKey.expirationTimestamp;
-    if (toKey.tokenId == 0) {
-      _assignNewTokenId(toKey);
-      _recordOwner(_recipient, toKey.tokenId);
-      // SafeAdd is not required here since expirationDuration is capped to a tiny value
-      // (relative to the size of a uint)
-      toKey.expirationTimestamp = block.timestamp + expirationDuration;
-    } else {
-      // This is an existing owner trying to extend their key
-      toKey.expirationTimestamp = previousExpiration.add(expirationDuration);
-    }
-
-    if (discount > 0) {
-      unlockProtocol.recordConsumedDiscount(discount, tokens);
-    }
-
-    unlockProtocol.recordKeyPurchase(netPrice, _referrer);
-
-    // trigger event
-    emit Transfer(
-      address(0), // This is a creation.
-      _recipient,
-      numberOfKeysSold
-    );
-  }
-}
-
-// File openzeppelin-solidity/contracts/cryptography/ECDSA.sol@v2.2.0
-
-pragma solidity ^0.5.2;
-
-/**
- * @title Elliptic curve signature operations
- * @dev Based on https://gist.github.com/axic/5b33912c6f61ae6fd96d6c4a47afde6d
- * TODO Remove this library once solidity supports passing a signature to ecrecover.
- * See https://github.com/ethereum/solidity/issues/864
- */
-
-library ECDSA {
-  /**
-   * @dev Recover signer address from a message by using their signature
-   * @param hash bytes32 message, the hash is the signed message. What is recovered is the signer address.
-   * @param signature bytes signature, the signature is generated using web3.eth.sign()
-   */
-  function recover(
-    bytes32 hash,
-    bytes memory signature
-  ) internal pure returns (address) {
-    // Check the signature length
-    if (signature.length != 65) {
-      return (address(0));
-    }
-
-    // Divide the signature in r, s and v variables
-    bytes32 r;
-    bytes32 s;
-    uint8 v;
-
-    // ecrecover takes the signature parameters, and the only way to get them
-    // currently is to use assembly.
-    // solhint-disable-next-line no-inline-assembly
-    assembly {
-      r := mload(add(signature, 0x20))
-      s := mload(add(signature, 0x40))
-      v := byte(0, mload(add(signature, 0x60)))
-    }
-
-    // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
-    // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
-    // the valid range for s in (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most
-    // signatures from current libraries generate a unique signature with an s-value in the lower half order.
-    //
-    // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
-    // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
-    // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
-    // these malleable signatures as well.
-    if (
-      uint256(s) >
-      0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0
-    ) {
-      return address(0);
-    }
-
-    if (v != 27 && v != 28) {
-      return address(0);
-    }
-
-    // If the signature is valid (and not malleable), return the signer address
-    return ecrecover(hash, v, r, s);
-  }
-
-  /**
-   * toEthSignedMessageHash
-   * @dev prefix a bytes32 value with "\x19Ethereum Signed Message:"
-   * and hash the result
-   */
-  function toEthSignedMessageHash(
-    bytes32 hash
-  ) internal pure returns (bytes32) {
-    // 32 is the length in bytes of hash,
-    // enforced by the type signature above
-    return
-      keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
-  }
-}
-
-// File contracts/mixins/MixinRefunds.sol
-
-pragma solidity 0.5.7;
-
-contract MixinRefunds is Ownable, MixinFunds, MixinLockCore, MixinKeys {
-  using SafeMath for uint;
-
-  // CancelAndRefund will return funds based on time remaining minus this penalty.
-  // This is calculated as `proRatedRefund * refundPenaltyNumerator / refundPenaltyDenominator`.
-  uint public refundPenaltyNumerator = 1;
-  uint public refundPenaltyDenominator = 10;
-
-  // Stores a nonce per user to use for signed messages
-  mapping(address => uint) public keyOwnerToNonce;
-
-  event CancelKey(
-    uint indexed tokenId,
-    address indexed owner,
-    address indexed sendTo,
-    uint refund
-  );
-
-  event RefundPenaltyChanged(
-    uint oldRefundPenaltyNumerator,
-    uint oldRefundPenaltyDenominator,
-    uint refundPenaltyNumerator,
-    uint refundPenaltyDenominator
-  );
-
-  /**
-   * @dev Destroys the user's key and sends a refund based on the amount of time remaining.
-   */
-  function cancelAndRefund() external {
-    _cancelAndRefund(msg.sender);
-  }
-
-  /**
-   * @dev Cancels a key owned by a different user and sends the funds to the msg.sender.
-   * @param _keyOwner this user's key will be canceled
-   * @param _signature getCancelAndRefundApprovalHash signed by the _keyOwner
-   */
-  function cancelAndRefundFor(
-    address _keyOwner,
-    bytes calldata _signature
-  ) external {
-    require(
-      ECDSA.recover(
-        ECDSA.toEthSignedMessageHash(
-          getCancelAndRefundApprovalHash(_keyOwner, msg.sender)
-        ),
-        _signature
-      ) == _keyOwner,
-      "INVALID_SIGNATURE"
-    );
-
-    keyOwnerToNonce[_keyOwner]++;
-    _cancelAndRefund(_keyOwner);
-  }
-
-  /**
-   * @dev Increments the current nonce for the msg.sender.
-   * This can be used to invalidate a previously signed message.
-   */
-  function incrementNonce() external {
-    keyOwnerToNonce[msg.sender]++;
-  }
-
-  /**
-   * Allow the owner to change the refund penalty.
-   */
-  function updateRefundPenalty(
-    uint _refundPenaltyNumerator,
-    uint _refundPenaltyDenominator
-  ) external onlyOwner {
-    require(_refundPenaltyDenominator != 0, "INVALID_RATE");
-
-    emit RefundPenaltyChanged(
-      refundPenaltyNumerator,
-      refundPenaltyDenominator,
-      _refundPenaltyNumerator,
-      _refundPenaltyDenominator
-    );
-    refundPenaltyNumerator = _refundPenaltyNumerator;
-    refundPenaltyDenominator = _refundPenaltyDenominator;
-  }
-
-  /**
-   * @dev Determines how much of a refund a key owner would receive if they issued
-   * a cancelAndRefund block.timestamp.
-   * Note that due to the time required to mine a tx, the actual refund amount will be lower
-   * than what the user reads from this call.
-   */
-  function getCancelAndRefundValueFor(
-    address _owner
-  ) external view returns (uint refund) {
-    return _getCancelAndRefundValue(_owner);
-  }
-
-  /**
-   * @dev returns the hash to sign in order to allow another user to cancel on your behalf.
-   */
-  function getCancelAndRefundApprovalHash(
-    address _keyOwner,
-    address _txSender
-  ) public view returns (bytes32 approvalHash) {
-    return
-      keccak256(
-        abi.encodePacked(
-          // Approval is specific to this Lock
-          address(this),
-          // Approval enables only one cancel call
-          keyOwnerToNonce[_keyOwner],
-          // Approval allows only one account to broadcast the tx
-          _txSender
-        )
-      );
-  }
-
-  /**
-   * @dev cancels the key for the given keyOwner and sends the refund to the msg.sender.
-   */
-  function _cancelAndRefund(address _keyOwner) internal {
-    Key storage key = _getKeyFor(_keyOwner);
-
-    uint refund = _getCancelAndRefundValue(_keyOwner);
-
-    emit CancelKey(key.tokenId, _keyOwner, msg.sender, refund);
-    // expirationTimestamp is a proxy for hasKey, setting this to `block.timestamp` instead
-    // of 0 so that we can still differentiate hasKey from hasValidKey.
-    key.expirationTimestamp = block.timestamp;
-
-    if (refund > 0) {
-      // Security: doing this last to avoid re-entrancy concerns
-      _transfer(msg.sender, refund);
-    }
-  }
-
-  /**
-   * @dev Determines how much of a refund a key owner would receive if they issued
-   * a cancelAndRefund now.
-   * @param _owner The owner of the key check the refund value for.
-   */
-  function _getCancelAndRefundValue(
-    address _owner
-  ) private view hasValidKey(_owner) returns (uint refund) {
-    Key storage key = _getKeyFor(_owner);
-    // Math: safeSub is not required since `hasValidKey` confirms timeRemaining is positive
-    uint timeRemaining = key.expirationTimestamp - block.timestamp;
-    if (timeRemaining >= expirationDuration) {
-      refund = keyPrice;
-    } else {
-      // Math: using safeMul in case keyPrice or timeRemaining is very large
-      refund = keyPrice.mul(timeRemaining) / expirationDuration;
-    }
-    uint penalty = keyPrice.mul(refundPenaltyNumerator) /
-      refundPenaltyDenominator;
-    if (refund > penalty) {
-      // Math: safeSub is not required since the if confirms this won't underflow
-      refund -= penalty;
-    } else {
-      refund = 0;
-    }
-  }
-}
-
-// File openzeppelin-solidity/contracts/utils/Address.sol@v2.2.0
-
-pragma solidity ^0.5.2;
-
-/**
- * Utility library of inline functions on addresses
- */
-library Address {
-  /**
-   * Returns whether the target address is a contract
-   * @dev This function will return false if invoked during the constructor of a contract,
-   * as the code is not actually created until after the constructor finishes.
-   * @param account address of the account to check
-   * @return whether the target address is a contract
-   */
-  function isContract(address account) internal view returns (bool) {
-    uint256 size;
-    // XXX Currently there is no better way to check if there is a contract in an address
-    // than to check the size of the code at that address.
-    // See https://ethereum.stackexchange.com/a/14016/36603
-    // for more details about how this works.
-    // TODO Check this again before the Serenity release, because all addresses will be
-    // contracts then.
-    // solhint-disable-next-line no-inline-assembly
-    assembly {
-      size := extcodesize(account)
-    }
-    return size > 0;
-  }
-}
-
-// File contracts/mixins/MixinTransfer.sol
-
-pragma solidity 0.5.7;
-
-/**
- * @title Mixin for the transfer-related functions needed to meet the ERC721
- * standard.
- * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
- * separates logically groupings of code to ease readability.
- */
-
-contract MixinTransfer is MixinFunds, MixinLockCore, MixinKeys, MixinApproval {
-  using SafeMath for uint;
-  using Address for address;
-
-  event TransferFeeChanged(
-    uint oldTransferFeeNumerator,
-    uint oldTransferFeeDenominator,
-    uint transferFeeNumerator,
-    uint transferFeeDenominator
-  );
-
-  // 0x150b7a02 == bytes4(keccak256('onERC721Received(address,address,uint256,bytes)'))
-  bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;
-
-  // The fee relative to keyPrice to charge when transfering a Key to another account
-  // (potentially on a 0x marketplace).
-  // This is calculated as `keyPrice * transferFeeNumerator / transferFeeDenominator`.
-  uint public transferFeeNumerator = 0;
-  uint public transferFeeDenominator = 100;
-
-  /**
-   * This is payable because at some point we want to allow the LOCK to capture a fee on 2ndary
-   * market transactions...
-   */
-  function transferFrom(
-    address _from,
-    address _recipient,
-    uint _tokenId
-  )
-    public
-    payable
-    onlyIfAlive
-    hasValidKey(_from)
-    onlyKeyOwnerOrApproved(_tokenId)
-  {
-    require(_recipient != address(0), "INVALID_ADDRESS");
-    _chargeAtLeast(getTransferFee(_from));
-
-    Key storage fromKey = _getKeyFor(_from);
-    Key storage toKey = _getKeyFor(_recipient);
-
-    uint previousExpiration = toKey.expirationTimestamp;
-
-    if (toKey.tokenId == 0) {
-      toKey.tokenId = fromKey.tokenId;
-      _recordOwner(_recipient, toKey.tokenId);
-    }
-
-    if (previousExpiration <= block.timestamp) {
-      // The recipient did not have a key, or had a key but it expired. The new expiration is the
-      // sender's key expiration
-      // an expired key is no longer a valid key, so the new tokenID is the sender's tokenID
-      toKey.expirationTimestamp = fromKey.expirationTimestamp;
-      toKey.tokenId = fromKey.tokenId;
-      _recordOwner(_recipient, _tokenId);
-    } else {
-      // The recipient has a non expired key. We just add them the corresponding remaining time
-      // SafeSub is not required since the if confirms `previousExpiration - block.timestamp` cannot underflow
-      toKey.expirationTimestamp = fromKey.expirationTimestamp.add(
-        previousExpiration - block.timestamp
-      );
-    }
-
-    // Effectively expiring the key for the previous owner
-    fromKey.expirationTimestamp = block.timestamp;
-
-    // Set the tokenID to 0 for the previous owner to avoid duplicates
-    fromKey.tokenId = 0;
-
-    // Clear any previous approvals
-    _clearApproval(_tokenId);
-
-    // trigger event
-    emit Transfer(_from, _recipient, _tokenId);
-  }
-
-  /**
-   * @notice Transfers the ownership of an NFT from one address to another address
-   * @dev This works identically to the other function with an extra data parameter,
-   *  except this function just sets data to ''
-   * @param _from The current owner of the NFT
-   * @param _to The new owner
-   * @param _tokenId The NFT to transfer
-   */
-  function safeTransferFrom(
-    address _from,
-    address _to,
-    uint _tokenId
-  ) external payable {
-    safeTransferFrom(_from, _to, _tokenId, "");
-  }
-
-  /**
-   * @notice Transfers the ownership of an NFT from one address to another address.
-   * When transfer is complete, this functions
-   *  checks if `_to` is a smart contract (code size > 0). If so, it calls
-   *  `onERC721Received` on `_to` and throws if the return value is not
-   *  `bytes4(keccak256('onERC721Received(address,address,uint,bytes)'))`.
-   * @param _from The current owner of the NFT
-   * @param _to The new owner
-   * @param _tokenId The NFT to transfer
-   * @param _data Additional data with no specified format, sent in call to `_to`
-   */
-  function safeTransferFrom(
-    address _from,
-    address _to,
-    uint _tokenId,
-    bytes memory _data
-  )
-    public
-    payable
-    onlyIfAlive
-    onlyKeyOwnerOrApproved(_tokenId)
-    hasValidKey(ownerOf(_tokenId))
-  {
-    transferFrom(_from, _to, _tokenId);
-    require(
-      _checkOnERC721Received(_from, _to, _tokenId, _data),
-      "NON_COMPLIANT_ERC721_RECEIVER"
-    );
-  }
-
-  /**
-   * Allow the Lock owner to change the transfer fee.
-   */
-  function updateTransferFee(
-    uint _transferFeeNumerator,
-    uint _transferFeeDenominator
-  ) external onlyOwner {
-    require(_transferFeeDenominator != 0, "INVALID_RATE");
-    emit TransferFeeChanged(
-      transferFeeNumerator,
-      transferFeeDenominator,
-      _transferFeeNumerator,
-      _transferFeeDenominator
-    );
-    transferFeeNumerator = _transferFeeNumerator;
-    transferFeeDenominator = _transferFeeDenominator;
-  }
-
-  /**
-   * Determines how much of a fee a key owner would need to pay in order to
-   * transfer the key to another account.  This is pro-rated so the fee goes down
-   * overtime.
-   * @param _owner The owner of the key check the transfer fee for.
-   */
-  function getTransferFee(
-    address _owner
-  ) public view hasValidKey(_owner) returns (uint) {
-    Key storage key = _getKeyFor(_owner);
-    // Math: safeSub is not required since `hasValidKey` confirms timeRemaining is positive
-    uint timeRemaining = key.expirationTimestamp - block.timestamp;
-    uint fee;
-    if (timeRemaining >= expirationDuration) {
-      // Max the potential impact of this fee for keys with long durations remaining
-      fee = keyPrice;
-    } else {
-      // Math: using safeMul in case keyPrice or timeRemaining is very large
-      fee = keyPrice.mul(timeRemaining) / expirationDuration;
-    }
-    return fee.mul(transferFeeNumerator) / transferFeeDenominator;
-  }
-
-  /**
-   * @dev Internal function to invoke `onERC721Received` on a target address
-   * The call is not executed if the target address is not a contract
-   * @param from address representing the previous owner of the given token ID
-   * @param to target address that will receive the tokens
-   * @param tokenId uint256 ID of the token to be transferred
-   * @param _data bytes optional data to send along with the call
-   * @return whether the call correctly returned the expected magic value
-   */
-  function _checkOnERC721Received(
-    address from,
-    address to,
-    uint256 tokenId,
-    bytes memory _data
-  ) internal returns (bool) {
-    if (!to.isContract()) {
-      return true;
-    }
-    bytes4 retval = IERC721Receiver(to).onERC721Received(
-      msg.sender,
-      from,
-      tokenId,
-      _data
-    );
-    return (retval == _ERC721_RECEIVED);
-  }
-}
-
-// File contracts/PublicLock.sol
-
-pragma solidity 0.5.7;
-
-/**
- * @title The Lock contract
- * @author Julien Genestoux (unlock-protocol.com)
- * Eventually: implement ERC721.
- * @dev ERC165 allows our contract to be queried to determine whether it implements a given interface.
- * Every ERC-721 compliant contract must implement the ERC165 interface.
- * https://eips.ethereum.org/EIPS/eip-721
- */
-contract PublicLock is
-  IERC721,
-  MixinNoFallback,
-  ERC165,
-  Ownable,
-  ERC721Holder,
-  MixinFunds,
-  MixinDisableAndDestroy,
-  MixinLockCore,
-  MixinKeys,
-  MixinLockMetadata,
-  MixinGrantKeys,
-  MixinPurchase,
-  MixinApproval,
-  MixinTransfer,
-  MixinRefunds
-{
-  constructor(
-    address _owner,
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys,
-    string memory _lockName
-  )
-    public
-    MixinFunds(_tokenAddress)
-    MixinLockCore(_expirationDuration, _keyPrice, _maxNumberOfKeys)
-    MixinLockMetadata(_lockName)
-  {
-    // registering the interface for erc721 with ERC165.sol using
-    // the ID specified in the standard: https://eips.ethereum.org/EIPS/eip-721
-    _registerInterface(0x80ac58cd);
-    // We must manually initialize Ownable.sol
-    Ownable.initialize(_owner);
-  }
-
-  // The version number of the current implementation on this network
-  function publicLockVersion() external pure returns (uint16) {
-    return 3;
-  }
-}
-
-// File contracts/Unlock.sol
-
-pragma solidity 0.5.7;
-
-/**
- * @title The Unlock contract
- * @author Julien Genestoux (unlock-protocol.com)
- * This smart contract has 3 main roles:
- *  1. Distribute discounts to discount token holders
- *  2. Grant dicount tokens to users making referrals and/or publishers granting discounts.
- *  3. Create & deploy Public Lock contracts.
- * In order to achieve these 3 elements, it keeps track of several things such as
- *  a. Deployed locks addresses and balances of discount tokens granted by each lock.
- *  b. The total network product (sum of all key sales, net of discounts)
- *  c. Total of discounts granted
- *  d. Balances of discount tokens, including 'frozen' tokens (which have been used to claim
- * discounts and cannot be used/transfered for a given period)
- *  e. Growth rate of Network Product
- *  f. Growth rate of Discount tokens supply
- * The smart contract has an owner who only can perform the following
- *  - Upgrades
- *  - Change in golden rules (20% of GDP available in discounts, and supply growth rate is at most
- * 50% of GNP growth rate)
- * NOTE: This smart contract is partially implemented for now until enough Locks are deployed and
- * in the wild.
- * The partial implementation includes the following features:
- *  a. Keeping track of deployed locks
- *  b. Keeping track of GNP
- */
-
-/// @dev Must list the direct base contracts in the order from “most base-like” to “most derived”.
-/// https://solidity.readthedocs.io/en/latest/contracts.html#multiple-inheritance-and-linearization
-contract Unlock is IUnlock, MixinNoFallback, Initializable, Ownable {
-  /**
-   * The struct for a lock
-   * We use deployed to keep track of deployments.
-   * This is required because both totalSales and yieldedDiscountTokens are 0 when initialized,
-   * which would be the same values when the lock is not set.
-   */
-  struct LockBalances {
-    bool deployed;
-    uint totalSales; // This is in wei
-    uint yieldedDiscountTokens;
-  }
-
-  modifier onlyFromDeployedLock() {
-    require(locks[msg.sender].deployed, "ONLY_LOCKS");
-    _;
-  }
-
-  uint public grossNetworkProduct;
-
-  uint public totalDiscountGranted;
-
-  // We keep track of deployed locks to ensure that callers are all deployed locks.
-  mapping(address => LockBalances) public locks;
-
-  // global base token URI
-  // Used by locks where the owner has not set a custom base URI.
-  string private globalBaseTokenURI;
-
-  // global base token symbol
-  // Used by locks where the owner has not set a custom symbol
-  string private globalTokenSymbol;
-
-  // Events
-  event NewLock(address indexed lockOwner, address indexed newLockAddress);
-
-  event NewTokenURI(string tokenURI);
-
-  event NewGlobalTokenSymbol(string tokenSymbol);
-
-  // Use initialize instead of a constructor to support proxies (for upgradeability via zos).
-  function initialize(address _owner) public initializer {
-    // We must manually initialize Ownable.sol
-    Ownable.initialize(_owner);
-  }
-
-  /**
-   * @dev Create lock
-   * This deploys a lock for a creator. It also keeps track of the deployed lock.
-   * @param _tokenAddress set to the ERC20 token address, or 0 for ETH.
-   */
-  function createLock(
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys,
-    string memory _lockName
-  ) public {
-    // create lock
-    address newLock = address(
-      new PublicLock(
-        msg.sender,
-        _expirationDuration,
-        _tokenAddress,
-        _keyPrice,
-        _maxNumberOfKeys,
-        _lockName
-      )
-    );
-
-    // Assign the new Lock
-    locks[newLock] = LockBalances({
-      deployed: true,
-      totalSales: 0,
-      yieldedDiscountTokens: 0
-    });
-
-    // trigger event
-    emit NewLock(msg.sender, newLock);
-  }
-
-  /**
-   * This function returns the discount available for a user, when purchasing a
-   * a key from a lock.
-   * This does not modify the state. It returns both the discount and the number of tokens
-   * consumed to grant that discount.
-   * TODO: actually implement this.
-   */
-  function computeAvailableDiscountFor(
-    address _purchaser, // solhint-disable-line no-unused-vars
-    uint _keyPrice // solhint-disable-line no-unused-vars
-  ) public view returns (uint discount, uint tokens) {
-    // TODO: implement me
-    return (0, 0);
-  }
-
-  /**
-   * This function keeps track of the added GDP, as well as grants of discount tokens
-   * to the referrer, if applicable.
-   * The number of discount tokens granted is based on the value of the referal,
-   * the current growth rate and the lock's discount token distribution rate
-   * This function is invoked by a previously deployed lock only.
-   * TODO: actually implement
-   */
-  function recordKeyPurchase(
-    uint _value,
-    address _referrer // solhint-disable-line no-unused-vars
-  ) public onlyFromDeployedLock {
-    // TODO: implement me (discount tokens)
-    grossNetworkProduct += _value;
-    locks[msg.sender].totalSales += _value;
-  }
-
-  /**
-   * This function will keep track of consumed discounts by a given user.
-   * It will also grant discount tokens to the creator who is granting the discount based on the
-   * amount of discount and compensation rate.
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordConsumedDiscount(
-    uint _discount,
-    uint _tokens // solhint-disable-line no-unused-vars
-  ) public onlyFromDeployedLock {
-    // TODO: implement me
-    totalDiscountGranted += _discount;
-    return;
-  }
-
-  // The version number of the current Unlock implementation on this network
-  function unlockVersion() external pure returns (uint16) {
-    return 3;
-  }
-
-  // function to read the globalTokenURI field.
-  function getGlobalBaseTokenURI() external view returns (string memory) {
-    return globalBaseTokenURI;
-  }
-
-  // function to set the globalTokenURI field.
-  function setGlobalBaseTokenURI(string calldata _URI) external onlyOwner {
-    globalBaseTokenURI = _URI;
-    emit NewTokenURI(_URI);
-  }
-
-  // function to read the globalTokenSymbol field.
-  function getGlobalTokenSymbol() external view returns (string memory) {
-    return globalTokenSymbol;
-  }
-
-  // function to set the globalTokenSymbol field.
-  function setGlobalTokenSymbol(string calldata _symbol) external onlyOwner {
-    globalTokenSymbol = _symbol;
-    emit NewGlobalTokenSymbol(_symbol);
-  }
-}
diff --git a/packages/contracts/src/contracts/Unlock/UnlockV4.sol b/packages/contracts/src/contracts/Unlock/UnlockV4.sol
deleted file mode 100644
index 5bc5af8f299..00000000000
--- a/packages/contracts/src/contracts/Unlock/UnlockV4.sol
+++ /dev/null
@@ -1,2387 +0,0 @@
-// Sources flattened with hardhat v2.4.1 https://hardhat.org
-
-// File zos-lib/contracts/Initializable.sol@v2.3.0
-
-pragma solidity >=0.4.24 <0.6.0;
-
-/**
- * @title Initializable
- *
- * @dev Helper contract to support initializer functions. To use it, replace
- * the constructor with a function that has the `initializer` modifier.
- * WARNING: Unlike constructors, initializer functions must be manually
- * invoked. This applies both to deploying an Initializable contract, as well
- * as extending an Initializable contract via inheritance.
- * WARNING: When used with inheritance, manual care must be taken to not invoke
- * a parent initializer twice, or ensure that all initializers are idempotent,
- * because this is not dealt with automatically as with constructors.
- */
-contract Initializable {
-  /**
-   * @dev Indicates that the contract has been initialized.
-   */
-  bool private initialized;
-
-  /**
-   * @dev Indicates that the contract is in the process of being initialized.
-   */
-  bool private initializing;
-
-  /**
-   * @dev Modifier to use in the initializer function of a contract.
-   */
-  modifier initializer() {
-    require(
-      initializing || isConstructor() || !initialized,
-      "Contract instance has already been initialized"
-    );
-
-    bool isTopLevelCall = !initializing;
-    if (isTopLevelCall) {
-      initializing = true;
-      initialized = true;
-    }
-
-    _;
-
-    if (isTopLevelCall) {
-      initializing = false;
-    }
-  }
-
-  /// @dev Returns true if and only if the function is running in the constructor
-  function isConstructor() private view returns (bool) {
-    // extcodesize checks the size of the code stored in an address, and
-    // address returns the current address. Since the code is still not
-    // deployed when running a constructor, any checks on its code size will
-    // yield zero, making it an effective way to detect if a contract is
-    // under construction or not.
-    uint256 cs;
-    assembly {
-      cs := extcodesize(address)
-    }
-    return cs == 0;
-  }
-
-  // Reserved storage space to allow for layout changes in the future.
-  uint256[50] private ______gap;
-}
-
-// File openzeppelin-eth/contracts/ownership/Ownable.sol@v2.1.3
-
-pragma solidity ^0.5.0;
-
-/**
- * @title Ownable
- * @dev The Ownable contract has an owner address, and provides basic authorization control
- * functions, this simplifies the implementation of "user permissions".
- */
-contract Ownable is Initializable {
-  address private _owner;
-
-  event OwnershipTransferred(
-    address indexed previousOwner,
-    address indexed newOwner
-  );
-
-  /**
-   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
-   * account.
-   */
-  function initialize(address sender) public initializer {
-    _owner = sender;
-    emit OwnershipTransferred(address(0), _owner);
-  }
-
-  /**
-   * @return the address of the owner.
-   */
-  function owner() public view returns (address) {
-    return _owner;
-  }
-
-  /**
-   * @dev Throws if called by any account other than the owner.
-   */
-  modifier onlyOwner() {
-    require(isOwner());
-    _;
-  }
-
-  /**
-   * @return true if `msg.sender` is the owner of the contract.
-   */
-  function isOwner() public view returns (bool) {
-    return msg.sender == _owner;
-  }
-
-  /**
-   * @dev Allows the current owner to relinquish control of the contract.
-   * @notice Renouncing to ownership will leave the contract without an owner.
-   * It will not be possible to call the functions with the `onlyOwner`
-   * modifier anymore.
-   */
-  function renounceOwnership() public onlyOwner {
-    emit OwnershipTransferred(_owner, address(0));
-    _owner = address(0);
-  }
-
-  /**
-   * @dev Allows the current owner to transfer control of the contract to a newOwner.
-   * @param newOwner The address to transfer ownership to.
-   */
-  function transferOwnership(address newOwner) public onlyOwner {
-    _transferOwnership(newOwner);
-  }
-
-  /**
-   * @dev Transfers control of the contract to a newOwner.
-   * @param newOwner The address to transfer ownership to.
-   */
-  function _transferOwnership(address newOwner) internal {
-    require(newOwner != address(0));
-    emit OwnershipTransferred(_owner, newOwner);
-    _owner = newOwner;
-  }
-
-  uint256[50] private ______gap;
-}
-
-// File contracts/interfaces/IERC721.sol
-
-pragma solidity 0.5.9;
-
-/// @title ERC-721 Non-Fungible Token Standard
-/// @dev See https://eips.ethereum.org/EIPS/eip-721
-///  Note: the ERC-165 identifier for this interface is 0x80ac58cd
-
-interface IERC721 {
-  /// @dev This emits when ownership of any NFT changes by any mechanism.
-  ///  This event emits when NFTs are created (`from` == 0) and destroyed
-  ///  (`to` == 0). Exception: during contract creation, any number of NFTs
-  ///  may be created and assigned without emitting Transfer. At the time of
-  ///  any transfer, the approved address for that NFT (if any) is reset to none.
-  event Transfer(
-    address indexed _from,
-    address indexed _to,
-    uint indexed _tokenId
-  );
-
-  /// @dev This emits when the approved address for an NFT is changed or
-  ///  reaffirmed. The zero address indicates there is no approved address.
-  ///  When a Transfer event emits, this also indicates that the approved
-  ///  address for that NFT (if any) is reset to none.
-  event Approval(
-    address indexed _owner,
-    address indexed _approved,
-    uint indexed _tokenId
-  );
-
-  /// @dev This emits when an operator is enabled or disabled for an owner.
-  ///  The operator can manage all NFTs of the owner.
-  event ApprovalForAll(
-    address indexed _owner,
-    address indexed _operator,
-    bool _approved
-  );
-
-  /// @notice Transfer ownership of an NFT -- THE CALLER IS RESPONSIBLE
-  ///  TO CONFIRM THAT `_to` IS CAPABLE OF RECEIVING NFTS OR ELSE
-  ///  THEY MAY BE PERMANENTLY LOST
-  /// @dev Throws unless `msg.sender` is the current owner, an authorized
-  ///  operator, or the approved address for this NFT. Throws if `_from` is
-  ///  not the current owner. Throws if `_to` is the zero address. Throws if
-  ///  `_tokenId` is not a valid NFT.
-  /// @param _from The current owner of the NFT
-  /// @param _to The new owner
-  /// @param _tokenId The NFT to transfer
-  function transferFrom(
-    address _from,
-    address _to,
-    uint _tokenId
-  ) external payable;
-
-  /// @notice Set or reaffirm the approved address for an NFT
-  /// @dev The zero address indicates there is no approved address.
-  /// @dev Throws unless `msg.sender` is the current NFT owner, or an authorized
-  ///  operator of the current owner.
-  /// @param _approved The new approved NFT controller
-  /// @param _tokenId The NFT to approve
-  function approve(address _approved, uint _tokenId) external payable;
-
-  /// @notice Transfers the ownership of an NFT from one address to another address
-  /// @dev Throws unless `msg.sender` is the current owner, an authorized
-  ///  operator, or the approved address for this NFT. Throws if `_from` is
-  ///  not the current owner. Throws if `_to` is the zero address. Throws if
-  ///  `_tokenId` is not a valid NFT. When transfer is complete, this function
-  ///  checks if `_to` is a smart contract (code size > 0). If so, it calls
-  ///  `onERC721Received` on `_to` and throws if the return value is not
-  ///  `bytes4(keccak256('onERC721Received(address,address,uint,bytes)'))`.
-  /// @param _from The current owner of the NFT
-  /// @param _to The new owner
-  /// @param _tokenId The NFT to transfer
-  /// @param data Additional data with no specified format, sent in call to `_to`
-  function safeTransferFrom(
-    address _from,
-    address _to,
-    uint _tokenId,
-    bytes calldata data
-  ) external payable;
-
-  /// @notice Transfers the ownership of an NFT from one address to another address
-  /// @dev This works identically to the other function with an extra data parameter,
-  ///  except this function just sets data to ''
-  /// @param _from The current owner of the NFT
-  /// @param _to The new owner
-  /// @param _tokenId The NFT to transfer
-  function safeTransferFrom(
-    address _from,
-    address _to,
-    uint _tokenId
-  ) external payable;
-
-  /// @notice Enable or disable approval for a third party ('operator') to manage
-  ///  all of `msg.sender`'s assets.
-  /// @dev Emits the ApprovalForAll event. The contract MUST allow
-  ///  multiple operators per owner.
-  /// @param _operator Address to add to the set of authorized operators.
-  /// @param _approved True if the operator is approved, false to revoke approval
-  function setApprovalForAll(address _operator, bool _approved) external;
-
-  /// @notice Count all NFTs assigned to an owner
-  /// @dev NFTs assigned to the zero address are considered invalid, and this
-  ///  function throws for queries about the zero address.
-  /// @param _owner An address for whom to query the balance
-  /// @return The number of NFTs owned by `_owner`, possibly zero
-  function balanceOf(address _owner) external view returns (uint);
-
-  /// @notice Find the owner of an NFT
-  /// @dev NFTs assigned to zero address are considered invalid, and queries
-  ///  about them do throw.
-  /// @param _tokenId The identifier for an NFT
-  /// @return The address of the owner of the NFT
-  function ownerOf(uint _tokenId) external view returns (address);
-
-  /// @notice Get the approved address for a single NFT
-  /// @dev Throws if `_tokenId` is not a valid NFT
-  /// @param _tokenId The NFT to find the approved address for
-  /// @return The approved address for this NFT, or the zero address if there is none
-  function getApproved(uint _tokenId) external view returns (address);
-
-  /// @notice Query if an address is an authorized operator for another address
-  /// @param _owner The address that owns the NFTs
-  /// @param _operator The address that acts on behalf of the owner
-  /// @return True if `_operator` is an approved operator for `_owner`, false otherwise
-  function isApprovedForAll(
-    address _owner,
-    address _operator
-  ) external view returns (bool);
-
-  /// @notice A descriptive name for a collection of NFTs in this contract
-  function name() external view returns (string memory _name);
-}
-
-// File openzeppelin-solidity/contracts/introspection/IERC165.sol@v2.3.0
-
-pragma solidity ^0.5.0;
-
-/**
- * @dev Interface of the ERC165 standard, as defined in the
- * [EIP](https://eips.ethereum.org/EIPS/eip-165).
- *
- * Implementers can declare support of contract interfaces, which can then be
- * queried by others (`ERC165Checker`).
- *
- * For an implementation, see `ERC165`.
- */
-interface IERC165 {
-  /**
-   * @dev Returns true if this contract implements the interface defined by
-   * `interfaceId`. See the corresponding
-   * [EIP section](https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified)
-   * to learn more about how these ids are created.
-   *
-   * This function call must use less than 30 000 gas.
-   */
-  function supportsInterface(bytes4 interfaceId) external view returns (bool);
-}
-
-// File openzeppelin-solidity/contracts/introspection/ERC165.sol@v2.3.0
-
-pragma solidity ^0.5.0;
-
-/**
- * @dev Implementation of the `IERC165` interface.
- *
- * Contracts may inherit from this and call `_registerInterface` to declare
- * their support of an interface.
- */
-contract ERC165 is IERC165 {
-  /*
-   * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7
-   */
-  bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;
-
-  /**
-   * @dev Mapping of interface ids to whether or not it's supported.
-   */
-  mapping(bytes4 => bool) private _supportedInterfaces;
-
-  constructor() internal {
-    // Derived contracts need only register support for their own interfaces,
-    // we register support for ERC165 itself here
-    _registerInterface(_INTERFACE_ID_ERC165);
-  }
-
-  /**
-   * @dev See `IERC165.supportsInterface`.
-   *
-   * Time complexity O(1), guaranteed to always use less than 30 000 gas.
-   */
-  function supportsInterface(bytes4 interfaceId) external view returns (bool) {
-    return _supportedInterfaces[interfaceId];
-  }
-
-  /**
-   * @dev Registers the contract as an implementer of the interface defined by
-   * `interfaceId`. Support of the actual ERC165 interface is automatic and
-   * registering its interface id is not required.
-   *
-   * See `IERC165.supportsInterface`.
-   *
-   * Requirements:
-   *
-   * - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`).
-   */
-  function _registerInterface(bytes4 interfaceId) internal {
-    require(interfaceId != 0xffffffff, "ERC165: invalid interface id");
-    _supportedInterfaces[interfaceId] = true;
-  }
-}
-
-// File openzeppelin-solidity/contracts/token/ERC721/IERC721Receiver.sol@v2.3.0
-
-pragma solidity ^0.5.0;
-
-/**
- * @title ERC721 token receiver interface
- * @dev Interface for any contract that wants to support safeTransfers
- * from ERC721 asset contracts.
- */
-contract IERC721Receiver {
-  /**
-   * @notice Handle the receipt of an NFT
-   * @dev The ERC721 smart contract calls this function on the recipient
-   * after a `safeTransfer`. This function MUST return the function selector,
-   * otherwise the caller will revert the transaction. The selector to be
-   * returned can be obtained as `this.onERC721Received.selector`. This
-   * function MAY throw to revert and reject the transfer.
-   * Note: the ERC721 contract address is always the message sender.
-   * @param operator The address which called `safeTransferFrom` function
-   * @param from The address which previously owned the token
-   * @param tokenId The NFT identifier which is being transferred
-   * @param data Additional data with no specified format
-   * @return bytes4 `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
-   */
-  function onERC721Received(
-    address operator,
-    address from,
-    uint256 tokenId,
-    bytes memory data
-  ) public returns (bytes4);
-}
-
-// File openzeppelin-solidity/contracts/token/ERC721/ERC721Holder.sol@v2.3.0
-
-pragma solidity ^0.5.0;
-
-contract ERC721Holder is IERC721Receiver {
-  function onERC721Received(
-    address,
-    address,
-    uint256,
-    bytes memory
-  ) public returns (bytes4) {
-    return this.onERC721Received.selector;
-  }
-}
-
-// File openzeppelin-solidity/contracts/token/ERC20/IERC20.sol@v2.3.0
-
-pragma solidity ^0.5.0;
-
-/**
- * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
- * the optional functions; to access them see `ERC20Detailed`.
- */
-interface IERC20 {
-  /**
-   * @dev Returns the amount of tokens in existence.
-   */
-  function totalSupply() external view returns (uint256);
-
-  /**
-   * @dev Returns the amount of tokens owned by `account`.
-   */
-  function balanceOf(address account) external view returns (uint256);
-
-  /**
-   * @dev Moves `amount` tokens from the caller's account to `recipient`.
-   *
-   * Returns a boolean value indicating whether the operation succeeded.
-   *
-   * Emits a `Transfer` event.
-   */
-  function transfer(address recipient, uint256 amount) external returns (bool);
-
-  /**
-   * @dev Returns the remaining number of tokens that `spender` will be
-   * allowed to spend on behalf of `owner` through `transferFrom`. This is
-   * zero by default.
-   *
-   * This value changes when `approve` or `transferFrom` are called.
-   */
-  function allowance(
-    address owner,
-    address spender
-  ) external view returns (uint256);
-
-  /**
-   * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
-   *
-   * Returns a boolean value indicating whether the operation succeeded.
-   *
-   * > Beware that changing an allowance with this method brings the risk
-   * that someone may use both the old and the new allowance by unfortunate
-   * transaction ordering. One possible solution to mitigate this race
-   * condition is to first reduce the spender's allowance to 0 and set the
-   * desired value afterwards:
-   * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
-   *
-   * Emits an `Approval` event.
-   */
-  function approve(address spender, uint256 amount) external returns (bool);
-
-  /**
-   * @dev Moves `amount` tokens from `sender` to `recipient` using the
-   * allowance mechanism. `amount` is then deducted from the caller's
-   * allowance.
-   *
-   * Returns a boolean value indicating whether the operation succeeded.
-   *
-   * Emits a `Transfer` event.
-   */
-  function transferFrom(
-    address sender,
-    address recipient,
-    uint256 amount
-  ) external returns (bool);
-
-  /**
-   * @dev Emitted when `value` tokens are moved from one account (`from`) to
-   * another (`to`).
-   *
-   * Note that `value` may be zero.
-   */
-  event Transfer(address indexed from, address indexed to, uint256 value);
-
-  /**
-   * @dev Emitted when the allowance of a `spender` for an `owner` is set by
-   * a call to `approve`. `value` is the new allowance.
-   */
-  event Approval(address indexed owner, address indexed spender, uint256 value);
-}
-
-// File contracts/mixins/MixinFunds.sol
-
-pragma solidity 0.5.9;
-
-/**
- * @title An implementation of the money related functions.
- * @author HardlyDifficult (unlock-protocol.com)
- */
-contract MixinFunds {
-  /**
-   * The token-type that this Lock is priced in.  If 0, then use ETH, else this is
-   * a ERC20 token address.
-   */
-  address public tokenAddress;
-
-  constructor(address _tokenAddress) public {
-    require(
-      _tokenAddress == address(0) || IERC20(_tokenAddress).totalSupply() > 0,
-      "INVALID_TOKEN"
-    );
-    tokenAddress = _tokenAddress;
-  }
-
-  /**
-   * Gets the current balance of the account provided.
-   */
-  function getBalance(address _account) public view returns (uint) {
-    if (tokenAddress == address(0)) {
-      return _account.balance;
-    } else {
-      return IERC20(tokenAddress).balanceOf(_account);
-    }
-  }
-
-  /**
-   * Ensures that the msg.sender has paid at least the price stated.
-   *
-   * With ETH, this means the function originally called was `payable` and the
-   * transaction included at least the amount requested.
-   *
-   * Security: be wary of re-entrancy when calling this function.
-   */
-  function _chargeAtLeast(uint _price) internal {
-    if (_price > 0) {
-      if (tokenAddress == address(0)) {
-        require(msg.value >= _price, "NOT_ENOUGH_FUNDS");
-      } else {
-        IERC20 token = IERC20(tokenAddress);
-        uint balanceBefore = token.balanceOf(address(this));
-        token.transferFrom(msg.sender, address(this), _price);
-
-        // There are known bugs in popular ERC20 implements which means we cannot
-        // trust the return value of `transferFrom`.  This require statement ensures
-        // that a transfer occurred.
-        require(
-          token.balanceOf(address(this)) > balanceBefore,
-          "TRANSFER_FAILED"
-        );
-      }
-    }
-  }
-
-  /**
-   * Transfers funds from the contract to the account provided.
-   *
-   * Security: be wary of re-entrancy when calling this function.
-   */
-  function _transfer(address _to, uint _amount) internal {
-    if (_amount > 0) {
-      if (tokenAddress == address(0)) {
-        address(uint160(_to)).transfer(_amount);
-      } else {
-        IERC20 token = IERC20(tokenAddress);
-        uint balanceBefore = token.balanceOf(_to);
-        token.transfer(_to, _amount);
-
-        // There are known bugs in popular ERC20 implements which means we cannot
-        // trust the return value of `transferFrom`.  This require statement ensures
-        // that a transfer occurred.
-        require(token.balanceOf(_to) > balanceBefore, "TRANSFER_FAILED");
-      }
-    }
-  }
-}
-
-// File contracts/mixins/MixinDisableAndDestroy.sol
-
-pragma solidity 0.5.9;
-
-/**
- * @title Mixin allowing the Lock owner to disable a Lock (preventing new purchases)
- * and then destroy it.
- * @author HardlyDifficult
- * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
- * separates logically groupings of code to ease readability.
- */
-contract MixinDisableAndDestroy is IERC721, Ownable, MixinFunds {
-  // Used to disable payable functions when deprecating an old lock
-  bool public isAlive;
-
-  event Destroy(uint balance, address indexed owner);
-
-  event Disable();
-
-  constructor() internal {
-    isAlive = true;
-  }
-
-  // Only allow usage when contract is Alive
-  modifier onlyIfAlive() {
-    require(isAlive, "LOCK_DEPRECATED");
-    _;
-  }
-
-  /**
-   * @dev Used to disable lock before migrating keys and/or destroying contract
-   */
-  function disableLock() external onlyOwner onlyIfAlive {
-    emit Disable();
-    isAlive = false;
-  }
-
-  /**
-   * @dev Used to clean up old lock contracts from the blockchain
-   * TODO: add a check to ensure all keys are INVALID!
-   */
-  function destroyLock() external onlyOwner {
-    require(isAlive == false, "DISABLE_FIRST");
-
-    emit Destroy(address(this).balance, msg.sender);
-
-    // this will send any ETH or ERC20 held by the lock to the owner
-    _transfer(msg.sender, getBalance(address(this)));
-    selfdestruct(msg.sender);
-
-    // Note we don't clean up the `locks` data in Unlock.sol as it should not be necessary
-    // and leaves some data behind ('Unlock.LockBalances') which may be helpful.
-  }
-}
-
-// File contracts/interfaces/IUnlock.sol
-
-pragma solidity 0.5.9;
-
-/**
- * @title The Unlock Interface
- **/
-
-interface IUnlock {
-  // Events
-  event NewLock(address indexed lockOwner, address indexed newLockAddress);
-
-  event NewTokenURI(string tokenURI);
-
-  event NewGlobalTokenSymbol(string tokenSymbol);
-
-  // Use initialize instead of a constructor to support proxies (for upgradeability via zos).
-  function initialize(address _owner) external;
-
-  /**
-   * @dev Create lock
-   * This deploys a lock for a creator. It also keeps track of the deployed lock.
-   * @param _tokenAddress set to the ERC20 token address, or 0 for ETH.
-   */
-  function createLock(
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys,
-    string calldata _lockName
-  ) external;
-
-  /**
-   * This function keeps track of the added GDP, as well as grants of discount tokens
-   * to the referrer, if applicable.
-   * The number of discount tokens granted is based on the value of the referal,
-   * the current growth rate and the lock's discount token distribution rate
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordKeyPurchase(
-    uint _value,
-    address _referrer // solhint-disable-line no-unused-vars
-  ) external;
-
-  /**
-   * This function will keep track of consumed discounts by a given user.
-   * It will also grant discount tokens to the creator who is granting the discount based on the
-   * amount of discount and compensation rate.
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordConsumedDiscount(
-    uint _discount,
-    uint _tokens // solhint-disable-line no-unused-vars
-  ) external;
-
-  /**
-   * This function returns the discount available for a user, when purchasing a
-   * a key from a lock.
-   * This does not modify the state. It returns both the discount and the number of tokens
-   * consumed to grant that discount.
-   */
-  function computeAvailableDiscountFor(
-    address _purchaser, // solhint-disable-line no-unused-vars
-    uint _keyPrice // solhint-disable-line no-unused-vars
-  ) external view returns (uint discount, uint tokens);
-
-  // Function to read the globalTokenURI field.
-  function getGlobalBaseTokenURI() external view returns (string memory);
-
-  /** Function to set the globalTokenURI field.
-   *  Should throw if called by other than owner
-   */
-  function setGlobalBaseTokenURI(string calldata _URI) external;
-
-  // Function to read the globalTokenSymbol field.
-  function getGlobalTokenSymbol() external view returns (string memory);
-
-  /** Function to set the globalTokenSymbol field.
-   *  Should throw if called by other than owner.
-   */
-  function setGlobalTokenSymbol(string calldata _symbol) external;
-}
-
-// File contracts/mixins/MixinLockCore.sol
-
-pragma solidity 0.5.9;
-
-/**
- * @title Mixin for core lock data and functions.
- * @author HardlyDifficult
- * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
- * separates logically groupings of code to ease readability.
- */
-contract MixinLockCore is Ownable, MixinFunds, MixinDisableAndDestroy {
-  event PriceChanged(uint oldKeyPrice, uint keyPrice);
-
-  event Withdrawal(
-    address indexed sender,
-    address indexed beneficiary,
-    uint amount
-  );
-
-  // Unlock Protocol address
-  // TODO: should we make that private/internal?
-  IUnlock public unlockProtocol;
-
-  // Duration in seconds for which the keys are valid, after creation
-  // should we take a smaller type use less gas?
-  // TODO: add support for a timestamp instead of duration
-  uint public expirationDuration;
-
-  // price in wei of the next key
-  // TODO: allow support for a keyPriceCalculator which could set prices dynamically
-  uint public keyPrice;
-
-  // Max number of keys sold if the keyReleaseMechanism is public
-  uint public maxNumberOfKeys;
-
-  // A count of how many new key purchases there have been
-  uint public numberOfKeysSold;
-
-  // The account which will receive funds on withdrawal
-  address public beneficiary;
-
-  // Ensure that the Lock has not sold all of its keys.
-  modifier notSoldOut() {
-    require(maxNumberOfKeys > numberOfKeysSold, "LOCK_SOLD_OUT");
-    _;
-  }
-
-  modifier onlyOwnerOrBeneficiary() {
-    require(
-      msg.sender == owner() || msg.sender == beneficiary,
-      "ONLY_LOCK_OWNER_OR_BENEFICIARY"
-    );
-    _;
-  }
-
-  constructor(
-    address _beneficiary,
-    uint _expirationDuration,
-    uint _keyPrice,
-    uint _maxNumberOfKeys
-  ) internal {
-    require(
-      _expirationDuration <= 100 * 365 * 24 * 60 * 60,
-      "MAX_EXPIRATION_100_YEARS"
-    );
-    unlockProtocol = IUnlock(msg.sender); // Make sure we link back to Unlock's smart contract.
-    beneficiary = _beneficiary;
-    expirationDuration = _expirationDuration;
-    keyPrice = _keyPrice;
-    maxNumberOfKeys = _maxNumberOfKeys;
-  }
-
-  /**
-   * @dev Called by owner to withdraw all funds from the lock and send them to the `beneficiary`.
-   * @param _amount specifies the max amount to withdraw, which may be reduced when
-   * considering the available balance. Set to 0 or MAX_UINT to withdraw everything.
-   *
-   * TODO: consider allowing anybody to trigger this as long as it goes to owner anyway?
-   *  -- however be wary of draining funds as it breaks the `cancelAndRefund` use case.
-   */
-  function withdraw(uint _amount) external onlyOwnerOrBeneficiary {
-    uint balance = getBalance(address(this));
-    uint amount;
-    if (_amount == 0 || _amount > balance) {
-      require(balance > 0, "NOT_ENOUGH_FUNDS");
-      amount = balance;
-    } else {
-      amount = _amount;
-    }
-
-    emit Withdrawal(msg.sender, beneficiary, amount);
-    // Security: re-entrancy not a risk as this is the last line of an external function
-    _transfer(beneficiary, amount);
-  }
-
-  /**
-   * A function which lets the owner of the lock to change the price for future purchases.
-   */
-  function updateKeyPrice(uint _keyPrice) external onlyOwner onlyIfAlive {
-    uint oldKeyPrice = keyPrice;
-    keyPrice = _keyPrice;
-    emit PriceChanged(oldKeyPrice, keyPrice);
-  }
-
-  /**
-   * A function which lets the owner of the lock update the beneficiary account,
-   * which receives funds on withdrawal.
-   */
-  function updateBeneficiary(
-    address _beneficiary
-  ) external onlyOwnerOrBeneficiary {
-    require(_beneficiary != address(0), "INVALID_ADDRESS");
-    beneficiary = _beneficiary;
-  }
-
-  /**
-   * Public function which returns the total number of unique keys sold (both
-   * expired and valid)
-   */
-  function totalSupply() public view returns (uint) {
-    return numberOfKeysSold;
-  }
-}
-
-// File contracts/mixins/MixinKeys.sol
-
-pragma solidity 0.5.9;
-
-/**
- * @title Mixin for managing `Key` data.
- * @author HardlyDifficult
- * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
- * separates logically groupings of code to ease readability.
- */
-contract MixinKeys is Ownable, MixinLockCore {
-  // The struct for a key
-  struct Key {
-    uint tokenId;
-    uint expirationTimestamp;
-  }
-
-  // Called when the Lock owner expires a user's Key
-  event ExpireKey(uint tokenId);
-
-  // Keys
-  // Each owner can have at most exactly one key
-  // TODO: could we use public here? (this could be confusing though because it getter will
-  // return 0 values when missing a key)
-  mapping(address => Key) private keyByOwner;
-
-  // Each tokenId can have at most exactly one owner at a time.
-  // Returns 0 if the token does not exist
-  // TODO: once we decouple tokenId from owner address (incl in js), then we can consider
-  // merging this with numberOfKeysSold into an array instead.
-  mapping(uint => address) private ownerByTokenId;
-
-  // Addresses of owners are also stored in an array.
-  // Addresses are never removed by design to avoid abuses around referals
-  address[] public owners;
-
-  // Ensures that an owner owns or has owned a key in the past
-  modifier ownsOrHasOwnedKey(address _owner) {
-    require(keyByOwner[_owner].expirationTimestamp > 0, "HAS_NEVER_OWNED_KEY");
-    _;
-  }
-
-  // Ensures that an owner has a valid key
-  modifier hasValidKey(address _owner) {
-    require(getHasValidKey(_owner), "KEY_NOT_VALID");
-    _;
-  }
-
-  // Ensures that a key has an owner
-  modifier isKey(uint _tokenId) {
-    require(ownerByTokenId[_tokenId] != address(0), "NO_SUCH_KEY");
-    _;
-  }
-
-  // Ensure that the caller owns the key
-  modifier onlyKeyOwner(uint _tokenId) {
-    require(isKeyOwner(_tokenId, msg.sender), "ONLY_KEY_OWNER");
-    _;
-  }
-
-  /**
-   * A function which lets the owner of the lock expire a users' key.
-   */
-  function expireKeyFor(address _owner) public onlyOwner hasValidKey(_owner) {
-    Key storage key = keyByOwner[_owner];
-    key.expirationTimestamp = block.timestamp; // Effectively expiring the key
-    emit ExpireKey(key.tokenId);
-  }
-
-  /**
-   * In the specific case of a Lock, each owner can own only at most 1 key.
-   * @return The number of NFTs owned by `_owner`, either 0 or 1.
-   */
-  function balanceOf(address _owner) external view returns (uint) {
-    require(_owner != address(0), "INVALID_ADDRESS");
-    return getHasValidKey(_owner) ? 1 : 0;
-  }
-
-  /**
-   * Checks if the user has a non-expired key.
-   */
-  function getHasValidKey(address _owner) public view returns (bool) {
-    return keyByOwner[_owner].expirationTimestamp > block.timestamp;
-  }
-
-  /**
-   * @notice Find the tokenId for a given user
-   * @return The tokenId of the NFT, else revert
-   */
-  function getTokenIdFor(
-    address _account
-  ) external view hasValidKey(_account) returns (uint) {
-    return keyByOwner[_account].tokenId;
-  }
-
-  /**
-   * A function which returns a subset of the keys for this Lock as an array
-   * @param _page the page of key owners requested when faceted by page size
-   * @param _pageSize the number of Key Owners requested per page
-   */
-  function getOwnersByPage(
-    uint _page,
-    uint _pageSize
-  ) public view returns (address[] memory) {
-    require(owners.length > 0, "NO_OUTSTANDING_KEYS");
-    uint pageSize = _pageSize;
-    uint _startIndex = _page * pageSize;
-    uint endOfPageIndex;
-
-    if (_startIndex + pageSize > owners.length) {
-      endOfPageIndex = owners.length;
-      pageSize = owners.length - _startIndex;
-    } else {
-      endOfPageIndex = (_startIndex + pageSize);
-    }
-
-    // new temp in-memory array to hold pageSize number of requested owners:
-    address[] memory ownersByPage = new address[](pageSize);
-    uint pageIndex = 0;
-
-    // Build the requested set of owners into a new temporary array:
-    for (uint i = _startIndex; i < endOfPageIndex; i++) {
-      ownersByPage[pageIndex] = owners[i];
-      pageIndex++;
-    }
-
-    return ownersByPage;
-  }
-
-  /**
-   * Checks if the given address owns the given tokenId.
-   */
-  function isKeyOwner(
-    uint _tokenId,
-    address _owner
-  ) public view returns (bool) {
-    return ownerByTokenId[_tokenId] == _owner;
-  }
-
-  /**
-   * @dev Returns the key's ExpirationTimestamp field for a given owner.
-   * @param _owner address of the user for whom we search the key
-   */
-  function keyExpirationTimestampFor(
-    address _owner
-  ) public view ownsOrHasOwnedKey(_owner) returns (uint timestamp) {
-    return keyByOwner[_owner].expirationTimestamp;
-  }
-
-  /**
-   * Public function which returns the total number of unique owners (both expired
-   * and valid).  This may be larger than totalSupply.
-   */
-  function numberOfOwners() public view returns (uint) {
-    return owners.length;
-  }
-
-  /**
-   * @notice ERC721: Find the owner of an NFT
-   * @return The address of the owner of the NFT, if applicable
-   */
-  function ownerOf(
-    uint _tokenId
-  ) public view isKey(_tokenId) returns (address) {
-    return ownerByTokenId[_tokenId];
-  }
-
-  /**
-   * Assigns the key a new tokenId (from numberOfKeysSold) if it does not already have
-   * one assigned.
-   */
-  function _assignNewTokenId(Key storage _key) internal {
-    if (_key.tokenId == 0) {
-      // This is a brand new owner, else an owner of an expired key buying an extension.
-      // We increment the tokenId counter
-      numberOfKeysSold++;
-      // we assign the incremented `numberOfKeysSold` as the tokenId for the new key
-      _key.tokenId = numberOfKeysSold;
-    }
-  }
-
-  /**
-   * Records the owner of a given tokenId
-   */
-  function _recordOwner(address _owner, uint _tokenId) internal {
-    if (ownerByTokenId[_tokenId] != _owner) {
-      // TODO: this may include duplicate entries
-      owners.push(_owner);
-      // We register the owner of the tokenID
-      ownerByTokenId[_tokenId] = _owner;
-    }
-  }
-
-  /**
-   * Returns the Key struct for the given owner.
-   */
-  function _getKeyFor(address _owner) internal view returns (Key storage) {
-    return keyByOwner[_owner];
-  }
-}
-
-// File contracts/mixins/MixinApproval.sol
-
-pragma solidity 0.5.9;
-
-/**
- * @title Mixin for the Approval related functions needed to meet the ERC721
- * standard.
- * @author HardlyDifficult
- * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
- * separates logically groupings of code to ease readability.
- */
-contract MixinApproval is IERC721, MixinDisableAndDestroy, MixinKeys {
-  // Keeping track of approved transfers
-  // This is a mapping of addresses which have approved
-  // the transfer of a key to another address where their key can be transfered
-  // Note: the approver may actually NOT have a key... and there can only
-  // be a single approved beneficiary
-  // Note 2: for transfer, both addresses will be different
-  // Note 3: for sales (new keys on restricted locks), both addresses will be the same
-  mapping(uint => address) private approved;
-
-  // Keeping track of approved operators for a Key owner.
-  // Since an owner can have up to 1 Key, this is similiar to above
-  // but the approval does not reset when a transfer occurs.
-  mapping(address => mapping(address => bool)) private ownerToOperatorApproved;
-
-  // Ensure that the caller has a key
-  // or that the caller has been approved
-  // for ownership of that key
-  modifier onlyKeyOwnerOrApproved(uint _tokenId) {
-    require(
-      isKeyOwner(_tokenId, msg.sender) ||
-        _isApproved(_tokenId, msg.sender) ||
-        isApprovedForAll(ownerOf(_tokenId), msg.sender),
-      "ONLY_KEY_OWNER_OR_APPROVED"
-    );
-    _;
-  }
-
-  /**
-   * This approves _approved to get ownership of _tokenId.
-   * Note: that since this is used for both purchase and transfer approvals
-   * the approved token may not exist.
-   */
-  function approve(
-    address _approved,
-    uint _tokenId
-  ) external payable onlyIfAlive onlyKeyOwnerOrApproved(_tokenId) {
-    require(msg.sender != _approved, "APPROVE_SELF");
-
-    approved[_tokenId] = _approved;
-    emit Approval(ownerOf(_tokenId), _approved, _tokenId);
-  }
-
-  /**
-   * @dev Sets or unsets the approval of a given operator
-   * An operator is allowed to transfer all tokens of the sender on their behalf
-   * @param _to operator address to set the approval
-   * @param _approved representing the status of the approval to be set
-   */
-  function setApprovalForAll(address _to, bool _approved) external onlyIfAlive {
-    require(_to != msg.sender, "APPROVE_SELF");
-    ownerToOperatorApproved[msg.sender][_to] = _approved;
-    emit ApprovalForAll(msg.sender, _to, _approved);
-  }
-
-  /**
-   * external version
-   * Will return the approved recipient for a key, if any.
-   */
-  function getApproved(uint _tokenId) external view returns (address) {
-    return _getApproved(_tokenId);
-  }
-
-  /**
-   * @dev Tells whether an operator is approved by a given owner
-   * @param _owner owner address which you want to query the approval of
-   * @param _operator operator address which you want to query the approval of
-   * @return bool whether the given operator is approved by the given owner
-   */
-  function isApprovedForAll(
-    address _owner,
-    address _operator
-  ) public view returns (bool) {
-    return ownerToOperatorApproved[_owner][_operator];
-  }
-
-  /**
-   * @dev Checks if the given user is approved to transfer the tokenId.
-   */
-  function _isApproved(
-    uint _tokenId,
-    address _user
-  ) internal view returns (bool) {
-    return approved[_tokenId] == _user;
-  }
-
-  /**
-   * Will return the approved recipient for a key transfer or ownership.
-   * Note: this does not check that a corresponding key
-   * actually exists.
-   */
-  function _getApproved(uint _tokenId) internal view returns (address) {
-    address approvedRecipient = approved[_tokenId];
-    require(approvedRecipient != address(0), "NONE_APPROVED");
-    return approvedRecipient;
-  }
-
-  /**
-   * @dev Function to clear current approval of a given token ID
-   * @param _tokenId uint256 ID of the token to be transferred
-   */
-  function _clearApproval(uint256 _tokenId) internal {
-    if (approved[_tokenId] != address(0)) {
-      approved[_tokenId] = address(0);
-    }
-  }
-}
-
-// File contracts/mixins/MixinGrantKeys.sol
-
-pragma solidity 0.5.9;
-
-/**
- * @title Mixin allowing the Lock owner to grant / gift keys to users.
- * @author HardlyDifficult
- * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
- * separates logically groupings of code to ease readability.
- */
-contract MixinGrantKeys is IERC721, Ownable, MixinKeys {
-  /**
-   * Allows the Lock owner to give a user a key with no charge.
-   */
-  function grantKey(
-    address _recipient,
-    uint _expirationTimestamp
-  ) external onlyOwner {
-    _grantKey(_recipient, _expirationTimestamp);
-  }
-
-  /**
-   * Allows the Lock owner to give a collection of users a key with no charge.
-   * All keys granted have the same expiration date.
-   */
-  function grantKeys(
-    address[] calldata _recipients,
-    uint _expirationTimestamp
-  ) external onlyOwner {
-    for (uint i = 0; i < _recipients.length; i++) {
-      _grantKey(_recipients[i], _expirationTimestamp);
-    }
-  }
-
-  /**
-   * Allows the Lock owner to give a collection of users a key with no charge.
-   * Each key may be assigned a different expiration date.
-   */
-  function grantKeys(
-    address[] calldata _recipients,
-    uint[] calldata _expirationTimestamps
-  ) external onlyOwner {
-    for (uint i = 0; i < _recipients.length; i++) {
-      _grantKey(_recipients[i], _expirationTimestamps[i]);
-    }
-  }
-
-  /**
-   * Give a key to the given user
-   */
-  function _grantKey(address _recipient, uint _expirationTimestamp) private {
-    require(_recipient != address(0), "INVALID_ADDRESS");
-
-    Key storage toKey = _getKeyFor(_recipient);
-    require(
-      _expirationTimestamp > toKey.expirationTimestamp,
-      "ALREADY_OWNS_KEY"
-    );
-
-    _assignNewTokenId(toKey);
-    _recordOwner(_recipient, toKey.tokenId);
-    toKey.expirationTimestamp = _expirationTimestamp;
-
-    // trigger event
-    emit Transfer(
-      address(0), // This is a creation.
-      _recipient,
-      toKey.tokenId
-    );
-  }
-}
-
-// File contracts/UnlockUtils.sol
-
-pragma solidity 0.5.9;
-
-// This contract provides some utility methods for use with the unlock protocol smart contracts.
-// Borrowed from:
-// https://github.com/oraclize/ethereum-api/blob/master/oraclizeAPI_0.5.sol#L943
-
-contract UnlockUtils {
-  function strConcat(
-    string memory _a,
-    string memory _b,
-    string memory _c,
-    string memory _d
-  ) public pure returns (string memory _concatenatedString) {
-    bytes memory _ba = bytes(_a);
-    bytes memory _bb = bytes(_b);
-    bytes memory _bc = bytes(_c);
-    bytes memory _bd = bytes(_d);
-    string memory abcd = new string(
-      _ba.length + _bb.length + _bc.length + _bd.length
-    );
-    bytes memory babcd = bytes(abcd);
-    uint k = 0;
-    uint i = 0;
-    for (i = 0; i < _ba.length; i++) {
-      babcd[k++] = _ba[i];
-    }
-    for (i = 0; i < _bb.length; i++) {
-      babcd[k++] = _bb[i];
-    }
-    for (i = 0; i < _bc.length; i++) {
-      babcd[k++] = _bc[i];
-    }
-    for (i = 0; i < _bd.length; i++) {
-      babcd[k++] = _bd[i];
-    }
-    return string(babcd);
-  }
-
-  function uint2Str(uint _i) public pure returns (string memory _uintAsString) {
-    // make a copy of the param to avoid security/no-assign-params error
-    uint c = _i;
-    if (_i == 0) {
-      return "0";
-    }
-    uint j = _i;
-    uint len;
-    while (j != 0) {
-      len++;
-      j /= 10;
-    }
-    bytes memory bstr = new bytes(len);
-    uint k = len - 1;
-    while (c != 0) {
-      bstr[k--] = bytes1(uint8(48 + (c % 10)));
-      c /= 10;
-    }
-    return string(bstr);
-  }
-
-  function address2Str(address _addr) public pure returns (string memory) {
-    bytes32 value = bytes32(uint256(_addr));
-    bytes memory alphabet = "0123456789abcdef";
-    bytes memory str = new bytes(42);
-    str[0] = "0";
-    str[1] = "x";
-    for (uint i = 0; i < 20; i++) {
-      str[2 + i * 2] = alphabet[uint8(value[i + 12] >> 4)];
-      str[3 + i * 2] = alphabet[uint8(value[i + 12] & 0x0f)];
-    }
-    return string(str);
-  }
-}
-
-// File contracts/mixins/MixinLockMetadata.sol
-
-pragma solidity 0.5.9;
-
-/**
- * @title Mixin for metadata about the Lock.
- * @author HardlyDifficult
- * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
- * separates logically groupings of code to ease readability.
- */
-contract MixinLockMetadata is
-  IERC721,
-  ERC165,
-  Ownable,
-  MixinLockCore,
-  UnlockUtils,
-  MixinKeys
-{
-  /// A descriptive name for a collection of NFTs in this contract.Defaults to "Unlock-Protocol" but is settable by lock owner
-  string private lockName;
-
-  /// An abbreviated name for NFTs in this contract. Defaults to "KEY" but is settable by lock owner
-  string private lockSymbol;
-
-  // the base Token URI for this Lock. If not set by lock owner, the global URI stored in Unlock is used.
-  string private baseTokenURI;
-
-  event NewLockSymbol(string symbol);
-
-  constructor(string memory _lockName) internal {
-    lockName = _lockName;
-    // registering the optional erc721 metadata interface with ERC165.sol using
-    // the ID specified in the standard: https://eips.ethereum.org/EIPS/eip-721
-    _registerInterface(0x5b5e139f);
-  }
-
-  /**
-   * Allows the Lock owner to assign a descriptive name for this Lock.
-   */
-  function updateLockName(string calldata _lockName) external onlyOwner {
-    lockName = _lockName;
-  }
-
-  /**
-   * @dev Gets the token name
-   * @return string representing the token name
-   */
-  function name() external view returns (string memory) {
-    return lockName;
-  }
-
-  /**
-   * Allows the Lock owner to assign a Symbol for this Lock.
-   */
-  function updateLockSymbol(string calldata _lockSymbol) external onlyOwner {
-    lockSymbol = _lockSymbol;
-    emit NewLockSymbol(_lockSymbol);
-  }
-
-  /**
-   * @dev Gets the token symbol
-   * @return string representing the token name
-   */
-  function symbol() external view returns (string memory) {
-    if (bytes(lockSymbol).length == 0) {
-      return unlockProtocol.getGlobalTokenSymbol();
-    } else {
-      return lockSymbol;
-    }
-  }
-
-  /**
-   * Allows the Lock owner to update the baseTokenURI for this Lock.
-   */
-  function setBaseTokenURI(string calldata _baseTokenURI) external onlyOwner {
-    baseTokenURI = _baseTokenURI;
-  }
-
-  /**  @notice A distinct Uniform Resource Identifier (URI) for a given asset.
-   * @dev Throws if `_tokenId` is not a valid NFT. URIs are defined in RFC
-   *  3986. The URI may point to a JSON file that conforms to the "ERC721
-   *  Metadata JSON Schema".
-   * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
-   */
-  function tokenURI(
-    uint256 _tokenId
-  ) external view isKey(_tokenId) returns (string memory) {
-    string memory URI;
-    if (bytes(baseTokenURI).length == 0) {
-      URI = unlockProtocol.getGlobalBaseTokenURI();
-    } else {
-      URI = baseTokenURI;
-    }
-
-    return
-      UnlockUtils.strConcat(
-        URI,
-        UnlockUtils.address2Str(address(this)),
-        "/",
-        UnlockUtils.uint2Str(_tokenId)
-      );
-  }
-}
-
-// File contracts/mixins/MixinNoFallback.sol
-
-pragma solidity 0.5.9;
-
-/**
- * @title Mixin for the fallback function implementation, which simply reverts.
- * @author HardlyDifficult
- * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
- * separates logically groupings of code to ease readability.
- */
-contract MixinNoFallback {
-  /**
-   * @dev the fallback function should not be used.  This explicitly reverts
-   * to ensure it's never used.
-   */
-  function() external {
-    revert("NO_FALLBACK");
-  }
-}
-
-// File openzeppelin-solidity/contracts/math/SafeMath.sol@v2.3.0
-
-pragma solidity ^0.5.0;
-
-/**
- * @dev Wrappers over Solidity's arithmetic operations with added overflow
- * checks.
- *
- * Arithmetic operations in Solidity wrap on overflow. This can easily result
- * in bugs, because programmers usually assume that an overflow raises an
- * error, which is the standard behavior in high level programming languages.
- * `SafeMath` restores this intuition by reverting the transaction when an
- * operation overflows.
- *
- * Using this library instead of the unchecked operations eliminates an entire
- * class of bugs, so it's recommended to use it always.
- */
-library SafeMath {
-  /**
-   * @dev Returns the addition of two unsigned integers, reverting on
-   * overflow.
-   *
-   * Counterpart to Solidity's `+` operator.
-   *
-   * Requirements:
-   * - Addition cannot overflow.
-   */
-  function add(uint256 a, uint256 b) internal pure returns (uint256) {
-    uint256 c = a + b;
-    require(c >= a, "SafeMath: addition overflow");
-
-    return c;
-  }
-
-  /**
-   * @dev Returns the subtraction of two unsigned integers, reverting on
-   * overflow (when the result is negative).
-   *
-   * Counterpart to Solidity's `-` operator.
-   *
-   * Requirements:
-   * - Subtraction cannot overflow.
-   */
-  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
-    require(b <= a, "SafeMath: subtraction overflow");
-    uint256 c = a - b;
-
-    return c;
-  }
-
-  /**
-   * @dev Returns the multiplication of two unsigned integers, reverting on
-   * overflow.
-   *
-   * Counterpart to Solidity's `*` operator.
-   *
-   * Requirements:
-   * - Multiplication cannot overflow.
-   */
-  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
-    // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
-    // benefit is lost if 'b' is also tested.
-    // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
-    if (a == 0) {
-      return 0;
-    }
-
-    uint256 c = a * b;
-    require(c / a == b, "SafeMath: multiplication overflow");
-
-    return c;
-  }
-
-  /**
-   * @dev Returns the integer division of two unsigned integers. Reverts on
-   * division by zero. The result is rounded towards zero.
-   *
-   * Counterpart to Solidity's `/` operator. Note: this function uses a
-   * `revert` opcode (which leaves remaining gas untouched) while Solidity
-   * uses an invalid opcode to revert (consuming all remaining gas).
-   *
-   * Requirements:
-   * - The divisor cannot be zero.
-   */
-  function div(uint256 a, uint256 b) internal pure returns (uint256) {
-    // Solidity only automatically asserts when dividing by 0
-    require(b > 0, "SafeMath: division by zero");
-    uint256 c = a / b;
-    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
-
-    return c;
-  }
-
-  /**
-   * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
-   * Reverts when dividing by zero.
-   *
-   * Counterpart to Solidity's `%` operator. This function uses a `revert`
-   * opcode (which leaves remaining gas untouched) while Solidity uses an
-   * invalid opcode to revert (consuming all remaining gas).
-   *
-   * Requirements:
-   * - The divisor cannot be zero.
-   */
-  function mod(uint256 a, uint256 b) internal pure returns (uint256) {
-    require(b != 0, "SafeMath: modulo by zero");
-    return a % b;
-  }
-}
-
-// File contracts/mixins/MixinPurchase.sol
-
-pragma solidity 0.5.9;
-
-/**
- * @title Mixin for the purchase-related functions.
- * @author HardlyDifficult
- * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
- * separates logically groupings of code to ease readability.
- */
-contract MixinPurchase is
-  MixinFunds,
-  MixinDisableAndDestroy,
-  MixinLockCore,
-  MixinKeys
-{
-  using SafeMath for uint;
-
-  /**
-   * @dev Purchase function, public version, with no referrer.
-   * @param _recipient address of the recipient of the purchased key
-   */
-  function purchaseFor(address _recipient) external payable onlyIfAlive {
-    return _purchaseFor(_recipient, address(0));
-  }
-
-  /**
-   * @dev Purchase function, public version, with referrer.
-   * @param _recipient address of the recipient of the purchased key
-   * @param _referrer address of the user making the referral
-   */
-  function purchaseForFrom(
-    address _recipient,
-    address _referrer
-  ) external payable onlyIfAlive hasValidKey(_referrer) {
-    return _purchaseFor(_recipient, _referrer);
-  }
-
-  /**
-   * @dev Purchase function: this lets a user purchase a key from the lock for another user
-   * @param _recipient address of the recipient of the purchased key
-   * This will fail if
-   *  - the keyReleaseMechanism is private
-   *  - the keyReleaseMechanism is Approved and the recipient has not been previously approved
-   *  - the amount value is smaller than the price
-   *  - the recipient already owns a key
-   * TODO: next version of solidity will allow for message to be added to require.
-   */
-  function _purchaseFor(
-    address _recipient,
-    address _referrer
-  ) private notSoldOut {
-    // solhint-disable-line function-max-lines
-    require(_recipient != address(0), "INVALID_ADDRESS");
-
-    // Let's get the actual price for the key from the Unlock smart contract
-    uint discount;
-    uint tokens;
-    uint inMemoryKeyPrice = keyPrice;
-    (discount, tokens) = unlockProtocol.computeAvailableDiscountFor(
-      _recipient,
-      inMemoryKeyPrice
-    );
-    uint netPrice = inMemoryKeyPrice;
-    if (discount > inMemoryKeyPrice) {
-      netPrice = 0;
-    } else {
-      // SafeSub not required as the if statement already confirmed `inMemoryKeyPrice - discount` cannot underflow
-      netPrice = inMemoryKeyPrice - discount;
-    }
-
-    // Assign the key
-    Key storage toKey = _getKeyFor(_recipient);
-
-    if (toKey.tokenId == 0) {
-      // Assign a new tokenId (if a new owner or previously transfered)
-      _assignNewTokenId(toKey);
-      _recordOwner(_recipient, toKey.tokenId);
-    }
-
-    if (toKey.expirationTimestamp >= block.timestamp) {
-      // This is an existing owner trying to extend their key
-      toKey.expirationTimestamp = toKey.expirationTimestamp.add(
-        expirationDuration
-      );
-    } else {
-      // SafeAdd is not required here since expirationDuration is capped to a tiny value
-      // (relative to the size of a uint)
-      toKey.expirationTimestamp = block.timestamp + expirationDuration;
-    }
-
-    if (discount > 0) {
-      unlockProtocol.recordConsumedDiscount(discount, tokens);
-    }
-
-    unlockProtocol.recordKeyPurchase(netPrice, _referrer);
-
-    // trigger event
-    emit Transfer(
-      address(0), // This is a creation.
-      _recipient,
-      numberOfKeysSold
-    );
-
-    // We explicitly allow for greater amounts of ETH to allow 'donations'
-    // Security: last line to minimize risk of re-entrancy
-    _chargeAtLeast(netPrice);
-  }
-}
-
-// File openzeppelin-solidity/contracts/cryptography/ECDSA.sol@v2.3.0
-
-pragma solidity ^0.5.0;
-
-/**
- * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
- *
- * These functions can be used to verify that a message was signed by the holder
- * of the private keys of a given address.
- */
-library ECDSA {
-  /**
-   * @dev Returns the address that signed a hashed message (`hash`) with
-   * `signature`. This address can then be used for verification purposes.
-   *
-   * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
-   * this function rejects them by requiring the `s` value to be in the lower
-   * half order, and the `v` value to be either 27 or 28.
-   *
-   * (.note) This call _does not revert_ if the signature is invalid, or
-   * if the signer is otherwise unable to be retrieved. In those scenarios,
-   * the zero address is returned.
-   *
-   * (.warning) `hash` _must_ be the result of a hash operation for the
-   * verification to be secure: it is possible to craft signatures that
-   * recover to arbitrary addresses for non-hashed data. A safe way to ensure
-   * this is by receiving a hash of the original message (which may otherwise)
-   * be too long), and then calling `toEthSignedMessageHash` on it.
-   */
-  function recover(
-    bytes32 hash,
-    bytes memory signature
-  ) internal pure returns (address) {
-    // Check the signature length
-    if (signature.length != 65) {
-      return (address(0));
-    }
-
-    // Divide the signature in r, s and v variables
-    bytes32 r;
-    bytes32 s;
-    uint8 v;
-
-    // ecrecover takes the signature parameters, and the only way to get them
-    // currently is to use assembly.
-    // solhint-disable-next-line no-inline-assembly
-    assembly {
-      r := mload(add(signature, 0x20))
-      s := mload(add(signature, 0x40))
-      v := byte(0, mload(add(signature, 0x60)))
-    }
-
-    // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
-    // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
-    // the valid range for s in (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most
-    // signatures from current libraries generate a unique signature with an s-value in the lower half order.
-    //
-    // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
-    // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
-    // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
-    // these malleable signatures as well.
-    if (
-      uint256(s) >
-      0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0
-    ) {
-      return address(0);
-    }
-
-    if (v != 27 && v != 28) {
-      return address(0);
-    }
-
-    // If the signature is valid (and not malleable), return the signer address
-    return ecrecover(hash, v, r, s);
-  }
-
-  /**
-   * @dev Returns an Ethereum Signed Message, created from a `hash`. This
-   * replicates the behavior of the
-   * [`eth_sign`](https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_sign)
-   * JSON-RPC method.
-   *
-   * See `recover`.
-   */
-  function toEthSignedMessageHash(
-    bytes32 hash
-  ) internal pure returns (bytes32) {
-    // 32 is the length in bytes of hash,
-    // enforced by the type signature above
-    return
-      keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
-  }
-}
-
-// File contracts/mixins/MixinRefunds.sol
-
-pragma solidity 0.5.9;
-
-contract MixinRefunds is Ownable, MixinFunds, MixinLockCore, MixinKeys {
-  using SafeMath for uint;
-
-  // CancelAndRefund will return funds based on time remaining minus this penalty.
-  // This is calculated as `proRatedRefund * refundPenaltyNumerator / refundPenaltyDenominator`.
-  uint public refundPenaltyNumerator = 1;
-  uint public refundPenaltyDenominator = 10;
-
-  // Stores a nonce per user to use for signed messages
-  mapping(address => uint) public keyOwnerToNonce;
-
-  event CancelKey(
-    uint indexed tokenId,
-    address indexed owner,
-    address indexed sendTo,
-    uint refund
-  );
-
-  event RefundPenaltyChanged(
-    uint oldRefundPenaltyNumerator,
-    uint oldRefundPenaltyDenominator,
-    uint refundPenaltyNumerator,
-    uint refundPenaltyDenominator
-  );
-
-  /**
-   * @dev Destroys the user's key and sends a refund based on the amount of time remaining.
-   */
-  function cancelAndRefund() external {
-    _cancelAndRefund(msg.sender);
-  }
-
-  /**
-   * @dev Cancels a key owned by a different user and sends the funds to the msg.sender.
-   * @param _keyOwner this user's key will be canceled
-   * @param _signature getCancelAndRefundApprovalHash signed by the _keyOwner
-   */
-  function cancelAndRefundFor(
-    address _keyOwner,
-    bytes calldata _signature
-  ) external {
-    require(
-      ECDSA.recover(
-        ECDSA.toEthSignedMessageHash(
-          getCancelAndRefundApprovalHash(_keyOwner, msg.sender)
-        ),
-        _signature
-      ) == _keyOwner,
-      "INVALID_SIGNATURE"
-    );
-
-    keyOwnerToNonce[_keyOwner]++;
-    _cancelAndRefund(_keyOwner);
-  }
-
-  /**
-   * @dev Increments the current nonce for the msg.sender.
-   * This can be used to invalidate a previously signed message.
-   */
-  function incrementNonce() external {
-    keyOwnerToNonce[msg.sender]++;
-  }
-
-  /**
-   * Allow the owner to change the refund penalty.
-   */
-  function updateRefundPenalty(
-    uint _refundPenaltyNumerator,
-    uint _refundPenaltyDenominator
-  ) external onlyOwner {
-    require(_refundPenaltyDenominator != 0, "INVALID_RATE");
-
-    emit RefundPenaltyChanged(
-      refundPenaltyNumerator,
-      refundPenaltyDenominator,
-      _refundPenaltyNumerator,
-      _refundPenaltyDenominator
-    );
-    refundPenaltyNumerator = _refundPenaltyNumerator;
-    refundPenaltyDenominator = _refundPenaltyDenominator;
-  }
-
-  /**
-   * @dev Determines how much of a refund a key owner would receive if they issued
-   * a cancelAndRefund block.timestamp.
-   * Note that due to the time required to mine a tx, the actual refund amount will be lower
-   * than what the user reads from this call.
-   */
-  function getCancelAndRefundValueFor(
-    address _owner
-  ) external view returns (uint refund) {
-    return _getCancelAndRefundValue(_owner);
-  }
-
-  /**
-   * @dev returns the hash to sign in order to allow another user to cancel on your behalf.
-   */
-  function getCancelAndRefundApprovalHash(
-    address _keyOwner,
-    address _txSender
-  ) public view returns (bytes32 approvalHash) {
-    return
-      keccak256(
-        abi.encodePacked(
-          // Approval is specific to this Lock
-          address(this),
-          // Approval enables only one cancel call
-          keyOwnerToNonce[_keyOwner],
-          // Approval allows only one account to broadcast the tx
-          _txSender
-        )
-      );
-  }
-
-  /**
-   * @dev cancels the key for the given keyOwner and sends the refund to the msg.sender.
-   */
-  function _cancelAndRefund(address _keyOwner) internal {
-    Key storage key = _getKeyFor(_keyOwner);
-
-    uint refund = _getCancelAndRefundValue(_keyOwner);
-
-    emit CancelKey(key.tokenId, _keyOwner, msg.sender, refund);
-    // expirationTimestamp is a proxy for hasKey, setting this to `block.timestamp` instead
-    // of 0 so that we can still differentiate hasKey from hasValidKey.
-    key.expirationTimestamp = block.timestamp;
-
-    if (refund > 0) {
-      // Security: doing this last to avoid re-entrancy concerns
-      _transfer(msg.sender, refund);
-    }
-  }
-
-  /**
-   * @dev Determines how much of a refund a key owner would receive if they issued
-   * a cancelAndRefund now.
-   * @param _owner The owner of the key check the refund value for.
-   */
-  function _getCancelAndRefundValue(
-    address _owner
-  ) private view hasValidKey(_owner) returns (uint refund) {
-    Key storage key = _getKeyFor(_owner);
-    // Math: safeSub is not required since `hasValidKey` confirms timeRemaining is positive
-    uint timeRemaining = key.expirationTimestamp - block.timestamp;
-    if (timeRemaining >= expirationDuration) {
-      refund = keyPrice;
-    } else {
-      // Math: using safeMul in case keyPrice or timeRemaining is very large
-      refund = keyPrice.mul(timeRemaining) / expirationDuration;
-    }
-    uint penalty = keyPrice.mul(refundPenaltyNumerator) /
-      refundPenaltyDenominator;
-    if (refund > penalty) {
-      // Math: safeSub is not required since the if confirms this won't underflow
-      refund -= penalty;
-    } else {
-      refund = 0;
-    }
-  }
-}
-
-// File openzeppelin-solidity/contracts/utils/Address.sol@v2.3.0
-
-pragma solidity ^0.5.0;
-
-/**
- * @dev Collection of functions related to the address type,
- */
-library Address {
-  /**
-   * @dev Returns true if `account` is a contract.
-   *
-   * This test is non-exhaustive, and there may be false-negatives: during the
-   * execution of a contract's constructor, its address will be reported as
-   * not containing a contract.
-   *
-   * > It is unsafe to assume that an address for which this function returns
-   * false is an externally-owned account (EOA) and not a contract.
-   */
-  function isContract(address account) internal view returns (bool) {
-    // This method relies in extcodesize, which returns 0 for contracts in
-    // construction, since the code is only stored at the end of the
-    // constructor execution.
-
-    uint256 size;
-    // solhint-disable-next-line no-inline-assembly
-    assembly {
-      size := extcodesize(account)
-    }
-    return size > 0;
-  }
-}
-
-// File contracts/mixins/MixinTransfer.sol
-
-pragma solidity 0.5.9;
-
-/**
- * @title Mixin for the transfer-related functions needed to meet the ERC721
- * standard.
- * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
- * separates logically groupings of code to ease readability.
- */
-
-contract MixinTransfer is MixinFunds, MixinLockCore, MixinKeys, MixinApproval {
-  using SafeMath for uint;
-  using Address for address;
-
-  event TransferFeeChanged(
-    uint oldTransferFeeNumerator,
-    uint oldTransferFeeDenominator,
-    uint transferFeeNumerator,
-    uint transferFeeDenominator
-  );
-
-  // 0x150b7a02 == bytes4(keccak256('onERC721Received(address,address,uint256,bytes)'))
-  bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;
-
-  // The fee relative to keyPrice to charge when transfering a Key to another account
-  // (potentially on a 0x marketplace).
-  // This is calculated as `keyPrice * transferFeeNumerator / transferFeeDenominator`.
-  uint public transferFeeNumerator = 0;
-  uint public transferFeeDenominator = 100;
-
-  /**
-   * This is payable because at some point we want to allow the LOCK to capture a fee on 2ndary
-   * market transactions...
-   */
-  function transferFrom(
-    address _from,
-    address _recipient,
-    uint _tokenId
-  )
-    public
-    payable
-    onlyIfAlive
-    hasValidKey(_from)
-    onlyKeyOwnerOrApproved(_tokenId)
-  {
-    require(_recipient != address(0), "INVALID_ADDRESS");
-    _chargeAtLeast(getTransferFee(_from));
-
-    Key storage fromKey = _getKeyFor(_from);
-    Key storage toKey = _getKeyFor(_recipient);
-
-    uint previousExpiration = toKey.expirationTimestamp;
-
-    if (toKey.tokenId == 0) {
-      toKey.tokenId = fromKey.tokenId;
-      _recordOwner(_recipient, toKey.tokenId);
-    }
-
-    if (previousExpiration <= block.timestamp) {
-      // The recipient did not have a key, or had a key but it expired. The new expiration is the
-      // sender's key expiration
-      // an expired key is no longer a valid key, so the new tokenID is the sender's tokenID
-      toKey.expirationTimestamp = fromKey.expirationTimestamp;
-      toKey.tokenId = fromKey.tokenId;
-      _recordOwner(_recipient, _tokenId);
-    } else {
-      // The recipient has a non expired key. We just add them the corresponding remaining time
-      // SafeSub is not required since the if confirms `previousExpiration - block.timestamp` cannot underflow
-      toKey.expirationTimestamp = fromKey.expirationTimestamp.add(
-        previousExpiration - block.timestamp
-      );
-    }
-
-    // Effectively expiring the key for the previous owner
-    fromKey.expirationTimestamp = block.timestamp;
-
-    // Set the tokenID to 0 for the previous owner to avoid duplicates
-    fromKey.tokenId = 0;
-
-    // Clear any previous approvals
-    _clearApproval(_tokenId);
-
-    // trigger event
-    emit Transfer(_from, _recipient, _tokenId);
-  }
-
-  /**
-   * @notice Transfers the ownership of an NFT from one address to another address
-   * @dev This works identically to the other function with an extra data parameter,
-   *  except this function just sets data to ''
-   * @param _from The current owner of the NFT
-   * @param _to The new owner
-   * @param _tokenId The NFT to transfer
-   */
-  function safeTransferFrom(
-    address _from,
-    address _to,
-    uint _tokenId
-  ) external payable {
-    safeTransferFrom(_from, _to, _tokenId, "");
-  }
-
-  /**
-   * @notice Transfers the ownership of an NFT from one address to another address.
-   * When transfer is complete, this functions
-   *  checks if `_to` is a smart contract (code size > 0). If so, it calls
-   *  `onERC721Received` on `_to` and throws if the return value is not
-   *  `bytes4(keccak256('onERC721Received(address,address,uint,bytes)'))`.
-   * @param _from The current owner of the NFT
-   * @param _to The new owner
-   * @param _tokenId The NFT to transfer
-   * @param _data Additional data with no specified format, sent in call to `_to`
-   */
-  function safeTransferFrom(
-    address _from,
-    address _to,
-    uint _tokenId,
-    bytes memory _data
-  )
-    public
-    payable
-    onlyIfAlive
-    onlyKeyOwnerOrApproved(_tokenId)
-    hasValidKey(ownerOf(_tokenId))
-  {
-    transferFrom(_from, _to, _tokenId);
-    require(
-      _checkOnERC721Received(_from, _to, _tokenId, _data),
-      "NON_COMPLIANT_ERC721_RECEIVER"
-    );
-  }
-
-  /**
-   * Allow the Lock owner to change the transfer fee.
-   */
-  function updateTransferFee(
-    uint _transferFeeNumerator,
-    uint _transferFeeDenominator
-  ) external onlyOwner {
-    require(_transferFeeDenominator != 0, "INVALID_RATE");
-    emit TransferFeeChanged(
-      transferFeeNumerator,
-      transferFeeDenominator,
-      _transferFeeNumerator,
-      _transferFeeDenominator
-    );
-    transferFeeNumerator = _transferFeeNumerator;
-    transferFeeDenominator = _transferFeeDenominator;
-  }
-
-  /**
-   * Determines how much of a fee a key owner would need to pay in order to
-   * transfer the key to another account.  This is pro-rated so the fee goes down
-   * overtime.
-   * @param _owner The owner of the key check the transfer fee for.
-   */
-  function getTransferFee(
-    address _owner
-  ) public view hasValidKey(_owner) returns (uint) {
-    Key storage key = _getKeyFor(_owner);
-    // Math: safeSub is not required since `hasValidKey` confirms timeRemaining is positive
-    uint timeRemaining = key.expirationTimestamp - block.timestamp;
-    uint fee;
-    if (timeRemaining >= expirationDuration) {
-      // Max the potential impact of this fee for keys with long durations remaining
-      fee = keyPrice;
-    } else {
-      // Math: using safeMul in case keyPrice or timeRemaining is very large
-      fee = keyPrice.mul(timeRemaining) / expirationDuration;
-    }
-    return fee.mul(transferFeeNumerator) / transferFeeDenominator;
-  }
-
-  /**
-   * @dev Internal function to invoke `onERC721Received` on a target address
-   * The call is not executed if the target address is not a contract
-   * @param from address representing the previous owner of the given token ID
-   * @param to target address that will receive the tokens
-   * @param tokenId uint256 ID of the token to be transferred
-   * @param _data bytes optional data to send along with the call
-   * @return whether the call correctly returned the expected magic value
-   */
-  function _checkOnERC721Received(
-    address from,
-    address to,
-    uint256 tokenId,
-    bytes memory _data
-  ) internal returns (bool) {
-    if (!to.isContract()) {
-      return true;
-    }
-    bytes4 retval = IERC721Receiver(to).onERC721Received(
-      msg.sender,
-      from,
-      tokenId,
-      _data
-    );
-    return (retval == _ERC721_RECEIVED);
-  }
-}
-
-// File contracts/PublicLock.sol
-
-pragma solidity 0.5.9;
-
-/**
- * @title The Lock contract
- * @author Julien Genestoux (unlock-protocol.com)
- * Eventually: implement ERC721.
- * @dev ERC165 allows our contract to be queried to determine whether it implements a given interface.
- * Every ERC-721 compliant contract must implement the ERC165 interface.
- * https://eips.ethereum.org/EIPS/eip-721
- */
-contract PublicLock is
-  IERC721,
-  MixinNoFallback,
-  ERC165,
-  Ownable,
-  ERC721Holder,
-  MixinFunds,
-  MixinDisableAndDestroy,
-  MixinLockCore,
-  MixinKeys,
-  MixinLockMetadata,
-  MixinGrantKeys,
-  MixinPurchase,
-  MixinApproval,
-  MixinTransfer,
-  MixinRefunds
-{
-  constructor(
-    address _owner,
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys,
-    string memory _lockName
-  )
-    public
-    MixinFunds(_tokenAddress)
-    MixinLockCore(_owner, _expirationDuration, _keyPrice, _maxNumberOfKeys)
-    MixinLockMetadata(_lockName)
-  {
-    // registering the interface for erc721 with ERC165.sol using
-    // the ID specified in the standard: https://eips.ethereum.org/EIPS/eip-721
-    _registerInterface(0x80ac58cd);
-    // We must manually initialize Ownable.sol
-    Ownable.initialize(_owner);
-  }
-
-  // The version number of the current implementation on this network
-  function publicLockVersion() external pure returns (uint16) {
-    return 4;
-  }
-}
-
-// File contracts/Unlock.sol
-
-pragma solidity 0.5.9;
-
-/**
- * @title The Unlock contract
- * @author Julien Genestoux (unlock-protocol.com)
- * This smart contract has 3 main roles:
- *  1. Distribute discounts to discount token holders
- *  2. Grant dicount tokens to users making referrals and/or publishers granting discounts.
- *  3. Create & deploy Public Lock contracts.
- * In order to achieve these 3 elements, it keeps track of several things such as
- *  a. Deployed locks addresses and balances of discount tokens granted by each lock.
- *  b. The total network product (sum of all key sales, net of discounts)
- *  c. Total of discounts granted
- *  d. Balances of discount tokens, including 'frozen' tokens (which have been used to claim
- * discounts and cannot be used/transfered for a given period)
- *  e. Growth rate of Network Product
- *  f. Growth rate of Discount tokens supply
- * The smart contract has an owner who only can perform the following
- *  - Upgrades
- *  - Change in golden rules (20% of GDP available in discounts, and supply growth rate is at most
- * 50% of GNP growth rate)
- * NOTE: This smart contract is partially implemented for now until enough Locks are deployed and
- * in the wild.
- * The partial implementation includes the following features:
- *  a. Keeping track of deployed locks
- *  b. Keeping track of GNP
- */
-
-/// @dev Must list the direct base contracts in the order from “most base-like” to “most derived”.
-/// https://solidity.readthedocs.io/en/latest/contracts.html#multiple-inheritance-and-linearization
-contract Unlock is IUnlock, MixinNoFallback, Initializable, Ownable {
-  /**
-   * The struct for a lock
-   * We use deployed to keep track of deployments.
-   * This is required because both totalSales and yieldedDiscountTokens are 0 when initialized,
-   * which would be the same values when the lock is not set.
-   */
-  struct LockBalances {
-    bool deployed;
-    uint totalSales; // This is in wei
-    uint yieldedDiscountTokens;
-  }
-
-  modifier onlyFromDeployedLock() {
-    require(locks[msg.sender].deployed, "ONLY_LOCKS");
-    _;
-  }
-
-  uint public grossNetworkProduct;
-
-  uint public totalDiscountGranted;
-
-  // We keep track of deployed locks to ensure that callers are all deployed locks.
-  mapping(address => LockBalances) public locks;
-
-  // global base token URI
-  // Used by locks where the owner has not set a custom base URI.
-  string private globalBaseTokenURI;
-
-  // global base token symbol
-  // Used by locks where the owner has not set a custom symbol
-  string private globalTokenSymbol;
-
-  // Events
-  event NewLock(address indexed lockOwner, address indexed newLockAddress);
-
-  event NewTokenURI(string tokenURI);
-
-  event NewGlobalTokenSymbol(string tokenSymbol);
-
-  // Use initialize instead of a constructor to support proxies (for upgradeability via zos).
-  function initialize(address _owner) public initializer {
-    // We must manually initialize Ownable.sol
-    Ownable.initialize(_owner);
-  }
-
-  /**
-   * @dev Create lock
-   * This deploys a lock for a creator. It also keeps track of the deployed lock.
-   * @param _tokenAddress set to the ERC20 token address, or 0 for ETH.
-   */
-  function createLock(
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys,
-    string memory _lockName
-  ) public {
-    // create lock
-    address newLock = address(
-      new PublicLock(
-        msg.sender,
-        _expirationDuration,
-        _tokenAddress,
-        _keyPrice,
-        _maxNumberOfKeys,
-        _lockName
-      )
-    );
-
-    // Assign the new Lock
-    locks[newLock] = LockBalances({
-      deployed: true,
-      totalSales: 0,
-      yieldedDiscountTokens: 0
-    });
-
-    // trigger event
-    emit NewLock(msg.sender, newLock);
-  }
-
-  /**
-   * This function returns the discount available for a user, when purchasing a
-   * a key from a lock.
-   * This does not modify the state. It returns both the discount and the number of tokens
-   * consumed to grant that discount.
-   * TODO: actually implement this.
-   */
-  function computeAvailableDiscountFor(
-    address _purchaser, // solhint-disable-line no-unused-vars
-    uint _keyPrice // solhint-disable-line no-unused-vars
-  ) public view returns (uint discount, uint tokens) {
-    // TODO: implement me
-    return (0, 0);
-  }
-
-  /**
-   * This function keeps track of the added GDP, as well as grants of discount tokens
-   * to the referrer, if applicable.
-   * The number of discount tokens granted is based on the value of the referal,
-   * the current growth rate and the lock's discount token distribution rate
-   * This function is invoked by a previously deployed lock only.
-   * TODO: actually implement
-   */
-  function recordKeyPurchase(
-    uint _value,
-    address _referrer // solhint-disable-line no-unused-vars
-  ) public onlyFromDeployedLock {
-    // TODO: implement me (discount tokens)
-    grossNetworkProduct += _value;
-    locks[msg.sender].totalSales += _value;
-  }
-
-  /**
-   * This function will keep track of consumed discounts by a given user.
-   * It will also grant discount tokens to the creator who is granting the discount based on the
-   * amount of discount and compensation rate.
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordConsumedDiscount(
-    uint _discount,
-    uint _tokens // solhint-disable-line no-unused-vars
-  ) public onlyFromDeployedLock {
-    // TODO: implement me
-    totalDiscountGranted += _discount;
-    return;
-  }
-
-  // The version number of the current Unlock implementation on this network
-  function unlockVersion() external pure returns (uint16) {
-    return 4;
-  }
-
-  // function to read the globalTokenURI field.
-  function getGlobalBaseTokenURI() external view returns (string memory) {
-    return globalBaseTokenURI;
-  }
-
-  // function to set the globalTokenURI field.
-  function setGlobalBaseTokenURI(string calldata _URI) external onlyOwner {
-    globalBaseTokenURI = _URI;
-    emit NewTokenURI(_URI);
-  }
-
-  // function to read the globalTokenSymbol field.
-  function getGlobalTokenSymbol() external view returns (string memory) {
-    return globalTokenSymbol;
-  }
-
-  // function to set the globalTokenSymbol field.
-  function setGlobalTokenSymbol(string calldata _symbol) external onlyOwner {
-    globalTokenSymbol = _symbol;
-    emit NewGlobalTokenSymbol(_symbol);
-  }
-}
diff --git a/packages/contracts/src/contracts/Unlock/UnlockV5.sol b/packages/contracts/src/contracts/Unlock/UnlockV5.sol
deleted file mode 100644
index 2ddc5ce892b..00000000000
--- a/packages/contracts/src/contracts/Unlock/UnlockV5.sol
+++ /dev/null
@@ -1,2 +0,0 @@
-// Error HH603: Hardhat flatten doesn't support cyclic dependencies.
-// For more info go to https://hardhat.org/HH603 or run Hardhat with --show-stack-traces
\ No newline at end of file
diff --git a/packages/contracts/src/contracts/Unlock/UnlockV6.sol b/packages/contracts/src/contracts/Unlock/UnlockV6.sol
deleted file mode 100644
index 31fe8739b11..00000000000
--- a/packages/contracts/src/contracts/Unlock/UnlockV6.sol
+++ /dev/null
@@ -1,1212 +0,0 @@
-// Sources flattened with hardhat v2.4.1 https://hardhat.org
-
-// File @openzeppelin/upgrades/contracts/Initializable.sol@v2.6.0
-
-pragma solidity >=0.4.24 <0.6.0;
-
-/**
- * @title Initializable
- *
- * @dev Helper contract to support initializer functions. To use it, replace
- * the constructor with a function that has the `initializer` modifier.
- * WARNING: Unlike constructors, initializer functions must be manually
- * invoked. This applies both to deploying an Initializable contract, as well
- * as extending an Initializable contract via inheritance.
- * WARNING: When used with inheritance, manual care must be taken to not invoke
- * a parent initializer twice, or ensure that all initializers are idempotent,
- * because this is not dealt with automatically as with constructors.
- */
-contract Initializable {
-  /**
-   * @dev Indicates that the contract has been initialized.
-   */
-  bool private initialized;
-
-  /**
-   * @dev Indicates that the contract is in the process of being initialized.
-   */
-  bool private initializing;
-
-  /**
-   * @dev Modifier to use in the initializer function of a contract.
-   */
-  modifier initializer() {
-    require(
-      initializing || isConstructor() || !initialized,
-      "Contract instance has already been initialized"
-    );
-
-    bool isTopLevelCall = !initializing;
-    if (isTopLevelCall) {
-      initializing = true;
-      initialized = true;
-    }
-
-    _;
-
-    if (isTopLevelCall) {
-      initializing = false;
-    }
-  }
-
-  /// @dev Returns true if and only if the function is running in the constructor
-  function isConstructor() private view returns (bool) {
-    // extcodesize checks the size of the code stored in an address, and
-    // address returns the current address. Since the code is still not
-    // deployed when running a constructor, any checks on its code size will
-    // yield zero, making it an effective way to detect if a contract is
-    // under construction or not.
-    uint256 cs;
-    assembly {
-      cs := extcodesize(address)
-    }
-    return cs == 0;
-  }
-
-  // Reserved storage space to allow for layout changes in the future.
-  uint256[50] private ______gap;
-}
-
-// File @openzeppelin/contracts-ethereum-package/contracts/GSN/Context.sol@v2.4.0
-
-pragma solidity ^0.5.0;
-
-/*
- * @dev Provides information about the current execution context, including the
- * sender of the transaction and its data. While these are generally available
- * via msg.sender and msg.data, they should not be accessed in such a direct
- * manner, since when dealing with GSN meta-transactions the account sending and
- * paying for execution may not be the actual sender (as far as an application
- * is concerned).
- *
- * This contract is only required for intermediate, library-like contracts.
- */
-contract Context is Initializable {
-  // Empty internal constructor, to prevent people from mistakenly deploying
-  // an instance of this contract, which should be used via inheritance.
-  constructor() internal {}
-
-  // solhint-disable-previous-line no-empty-blocks
-
-  function _msgSender() internal view returns (address payable) {
-    return msg.sender;
-  }
-
-  function _msgData() internal view returns (bytes memory) {
-    this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
-    return msg.data;
-  }
-}
-
-// File @openzeppelin/contracts-ethereum-package/contracts/ownership/Ownable.sol@v2.4.0
-
-pragma solidity ^0.5.0;
-
-/**
- * @dev Contract module which provides a basic access control mechanism, where
- * there is an account (an owner) that can be granted exclusive access to
- * specific functions.
- *
- * This module is used through inheritance. It will make available the modifier
- * `onlyOwner`, which can be aplied to your functions to restrict their use to
- * the owner.
- */
-contract Ownable is Initializable, Context {
-  address private _owner;
-
-  event OwnershipTransferred(
-    address indexed previousOwner,
-    address indexed newOwner
-  );
-
-  /**
-   * @dev Initializes the contract setting the deployer as the initial owner.
-   */
-  function initialize(address sender) public initializer {
-    _owner = sender;
-    emit OwnershipTransferred(address(0), _owner);
-  }
-
-  /**
-   * @dev Returns the address of the current owner.
-   */
-  function owner() public view returns (address) {
-    return _owner;
-  }
-
-  /**
-   * @dev Throws if called by any account other than the owner.
-   */
-  modifier onlyOwner() {
-    require(isOwner(), "Ownable: caller is not the owner");
-    _;
-  }
-
-  /**
-   * @dev Returns true if the caller is the current owner.
-   */
-  function isOwner() public view returns (bool) {
-    return _msgSender() == _owner;
-  }
-
-  /**
-   * @dev Leaves the contract without owner. It will not be possible to call
-   * `onlyOwner` functions anymore. Can only be called by the current owner.
-   *
-   * > Note: Renouncing ownership will leave the contract without an owner,
-   * thereby removing any functionality that is only available to the owner.
-   */
-  function renounceOwnership() public onlyOwner {
-    emit OwnershipTransferred(_owner, address(0));
-    _owner = address(0);
-  }
-
-  /**
-   * @dev Transfers ownership of the contract to a new account (`newOwner`).
-   * Can only be called by the current owner.
-   */
-  function transferOwnership(address newOwner) public onlyOwner {
-    _transferOwnership(newOwner);
-  }
-
-  /**
-   * @dev Transfers ownership of the contract to a new account (`newOwner`).
-   */
-  function _transferOwnership(address newOwner) internal {
-    require(newOwner != address(0), "Ownable: new owner is the zero address");
-    emit OwnershipTransferred(_owner, newOwner);
-    _owner = newOwner;
-  }
-
-  uint256[50] private ______gap;
-}
-
-// File hardlydifficult-ethereum-contracts/contracts/proxies/Clone2Factory.sol@v0.7.12
-
-pragma solidity ^0.5.0;
-
-// From https://github.com/optionality/clone-factory/blob/master/contracts/CloneFactory.sol
-// Updated to support Solidity 5, switch to `create2` and revert on fail
-library Clone2Factory {
-  /**
-   * @notice Uses create2 to deploy a clone to a pre-determined address.
-   * @param target the address of the template contract, containing the logic for this contract.
-   * @param salt a salt used to determine the contract address before the transaction is mined,
-   * may be random or sequential.
-   * @return proxyAddress the address of the newly deployed contract.
-   * @dev Using `bytes12` for the salt saves 6 gas over using `uint96` (requires another shift).
-   * Will revert on fail.
-   */
-  function _createClone2(
-    address target,
-    bytes12 salt
-  ) internal returns (address proxyAddress) {
-    // solium-disable-next-line
-    assembly {
-      let pointer := mload(0x40)
-
-      // Create the bytecode for deployment based on the Minimal Proxy Standard (EIP-1167)
-      // bytecode: 0x0
-      mstore(
-        pointer,
-        0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000
-      )
-      mstore(add(pointer, 0x14), shl(96, target))
-      mstore(
-        add(pointer, 0x28),
-        0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000
-      )
-
-      // `create2` consumes all available gas if called with a salt that's already been consumed
-      // we check if the address is available first so that doesn't happen
-      // Costs ~958 gas
-
-      // Calculate the hash
-      let contractCodeHash := keccak256(pointer, 0x37)
-
-      // salt: 0x100
-      // The salt to use with the create2 call is `msg.sender+salt`
-      // this prevents at attacker from front-running another user's deployment
-      mstore(add(pointer, 0x100), shl(96, caller))
-      mstore(add(pointer, 0x114), salt)
-
-      // addressSeed: 0x40
-      // 0xff
-      mstore(
-        add(pointer, 0x40),
-        0xff00000000000000000000000000000000000000000000000000000000000000
-      )
-      // this
-      mstore(add(pointer, 0x41), shl(96, address))
-      // salt
-      mstore(add(pointer, 0x55), mload(add(pointer, 0x100)))
-      // hash
-      mstore(add(pointer, 0x75), contractCodeHash)
-
-      proxyAddress := keccak256(add(pointer, 0x40), 0x55)
-
-      switch extcodesize(proxyAddress)
-      case 0 {
-        // Deploy the contract, returning the address or 0 on fail
-        proxyAddress := create2(0, pointer, 0x37, mload(add(pointer, 0x100)))
-      }
-      default {
-        proxyAddress := 0
-      }
-    }
-
-    // Revert if the deployment fails (possible if salt was already used)
-    require(proxyAddress != address(0), "PROXY_DEPLOY_FAILED");
-  }
-}
-
-// File @openzeppelin/contracts-ethereum-package/contracts/introspection/IERC165.sol@v2.4.0
-
-pragma solidity ^0.5.0;
-
-/**
- * @dev Interface of the ERC165 standard, as defined in the
- * https://eips.ethereum.org/EIPS/eip-165[EIP].
- *
- * Implementers can declare support of contract interfaces, which can then be
- * queried by others ({ERC165Checker}).
- *
- * For an implementation, see {ERC165}.
- */
-interface IERC165 {
-  /**
-   * @dev Returns true if this contract implements the interface defined by
-   * `interfaceId`. See the corresponding
-   * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
-   * to learn more about how these ids are created.
-   *
-   * This function call must use less than 30 000 gas.
-   */
-  function supportsInterface(bytes4 interfaceId) external view returns (bool);
-}
-
-// File @openzeppelin/contracts-ethereum-package/contracts/token/ERC721/IERC721.sol@v2.4.0
-
-pragma solidity ^0.5.0;
-
-/**
- * @dev Required interface of an ERC721 compliant contract.
- */
-contract IERC721 is Initializable, IERC165 {
-  event Transfer(
-    address indexed from,
-    address indexed to,
-    uint256 indexed tokenId
-  );
-  event Approval(
-    address indexed owner,
-    address indexed approved,
-    uint256 indexed tokenId
-  );
-  event ApprovalForAll(
-    address indexed owner,
-    address indexed operator,
-    bool approved
-  );
-
-  /**
-   * @dev Returns the number of NFTs in `owner`'s account.
-   */
-  function balanceOf(address owner) public view returns (uint256 balance);
-
-  /**
-   * @dev Returns the owner of the NFT specified by `tokenId`.
-   */
-  function ownerOf(uint256 tokenId) public view returns (address owner);
-
-  /**
-   * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
-   * another (`to`).
-   *
-   *
-   *
-   * Requirements:
-   * - `from`, `to` cannot be zero.
-   * - `tokenId` must be owned by `from`.
-   * - If the caller is not `from`, it must be have been allowed to move this
-   * NFT by either `approve` or `setApprovalForAll`.
-   */
-  function safeTransferFrom(address from, address to, uint256 tokenId) public;
-
-  /**
-   * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
-   * another (`to`).
-   *
-   * Requirements:
-   * - If the caller is not `from`, it must be approved to move this NFT by
-   * either `approve` or `setApprovalForAll`.
-   */
-  function transferFrom(address from, address to, uint256 tokenId) public;
-
-  function approve(address to, uint256 tokenId) public;
-
-  function getApproved(uint256 tokenId) public view returns (address operator);
-
-  function setApprovalForAll(address operator, bool _approved) public;
-
-  function isApprovedForAll(
-    address owner,
-    address operator
-  ) public view returns (bool);
-
-  function safeTransferFrom(
-    address from,
-    address to,
-    uint256 tokenId,
-    bytes memory data
-  ) public;
-}
-
-// File @openzeppelin/contracts-ethereum-package/contracts/token/ERC721/IERC721Enumerable.sol@v2.4.0
-
-pragma solidity ^0.5.0;
-
-/**
- * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
- * @dev See https://eips.ethereum.org/EIPS/eip-721
- */
-contract IERC721Enumerable is Initializable, IERC721 {
-  function totalSupply() public view returns (uint256);
-
-  function tokenOfOwnerByIndex(
-    address owner,
-    uint256 index
-  ) public view returns (uint256 tokenId);
-
-  function tokenByIndex(uint256 index) public view returns (uint256);
-}
-
-// File contracts/interfaces/IPublicLock.sol
-
-pragma solidity ^0.5.0;
-
-/**
- * @title The PublicLock Interface
- */
-
-contract IPublicLock is IERC721Enumerable {
-  // See indentationissue description here:
-  // https://github.com/duaraghav8/Ethlint/issues/268
-  // solium-disable indentation
-
-  /// Events
-  event Destroy(uint balance, address indexed owner);
-
-  event Disable();
-
-  event Withdrawal(
-    address indexed sender,
-    address indexed tokenAddress,
-    address indexed beneficiary,
-    uint amount
-  );
-
-  event CancelKey(
-    uint indexed tokenId,
-    address indexed owner,
-    address indexed sendTo,
-    uint refund
-  );
-
-  event RefundPenaltyChanged(
-    uint freeTrialLength,
-    uint refundPenaltyBasisPoints
-  );
-
-  event PricingChanged(
-    uint oldKeyPrice,
-    uint keyPrice,
-    address oldTokenAddress,
-    address tokenAddress
-  );
-
-  event ExpireKey(uint indexed tokenId);
-
-  event NewLockSymbol(string symbol);
-
-  event TransferFeeChanged(uint transferFeeBasisPoints);
-
-  /// @notice emits anytime the nonce used for off-chain approvals changes.
-  event NonceChanged(address indexed keyOwner, uint nextAvailableNonce);
-
-  ///===================================================================
-
-  /// Functions
-
-  function initialize(
-    address _owner,
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys,
-    string calldata _lockName
-  ) external;
-
-  /**
-   * @notice The version number of the current implementation on this network.
-   * @return The current version number.
-   */
-  function publicLockVersion() public pure returns (uint);
-
-  /**
-   * @notice Gets the current balance of the account provided.
-   * @param _tokenAddress The token type to retrieve the balance of.
-   * @param _account The account to get the balance of.
-   * @return The number of tokens of the given type for the given address, possibly 0.
-   */
-  function getBalance(
-    address _tokenAddress,
-    address _account
-  ) external view returns (uint);
-
-  /**
-   * @notice Used to disable lock before migrating keys and/or destroying contract.
-   * @dev Throws if called by other than the owner.
-   * @dev Throws if lock contract has already been disabled.
-   */
-  function disableLock() external;
-
-  /**
-   * @notice Used to clean up old lock contracts from the blockchain.
-   * TODO: add a check to ensure all keys are INVALID!
-   * @dev Throws if called by other than owner.
-   * @dev Throws if lock has not yet been disabled.
-   */
-  function destroyLock() external;
-
-  /**
-   * @dev Called by owner to withdraw all funds from the lock and send them to the `beneficiary`.
-   * @dev Throws if called by other than the owner or beneficiary
-   * @param _tokenAddress specifies the token address to withdraw or 0 for ETH. This is usually
-   * the same as `tokenAddress` in MixinFunds.
-   * @param _amount specifies the max amount to withdraw, which may be reduced when
-   * considering the available balance. Set to 0 or MAX_UINT to withdraw everything.
-   *  -- however be wary of draining funds as it breaks the `cancelAndRefund` and `fullRefund`
-   * use cases.
-   */
-  function withdraw(address _tokenAddress, uint _amount) external;
-
-  /**
-   * A function which lets the owner of the lock to change the price for future purchases.
-   * @dev Throws if called by other than owner
-   * @dev Throws if lock has been disabled
-   * @dev Throws if _tokenAddress is not a valid token
-   * @param _keyPrice The new price to set for keys
-   * @param _tokenAddress The address of the erc20 token to use for pricing the keys,
-   * or 0 to use ETH
-   */
-  function updateKeyPricing(uint _keyPrice, address _tokenAddress) external;
-
-  /**
-   * A function which lets the owner of the lock update the beneficiary account,
-   * which receives funds on withdrawal.
-   * @dev Throws if called by other than owner of beneficiary
-   * @dev Throws if _beneficiary is address(0)
-   * @param _beneficiary The new address to set as the beneficiary
-   */
-  function updateBeneficiary(address _beneficiary) external;
-
-  /**
-   * A function which lets the owner of the lock expire a users' key.
-   * @dev Throws if called by other than lock owner
-   * @dev Throws if key owner does not have a valid key
-   * @param _owner The address of the key owner
-   */
-  function expireKeyFor(address _owner) external;
-
-  /**
-   * Checks if the user has a non-expired key.
-   * @param _owner The address of the key owner
-   */
-  function getHasValidKey(address _owner) external view returns (bool);
-
-  /**
-   * @notice Find the tokenId for a given user
-   * @return The tokenId of the NFT, else revert
-   * @dev Throws if key owner does not have a valid key
-   * @param _account The address of the key owner
-   */
-  function getTokenIdFor(address _account) external view returns (uint);
-
-  /**
-   * A function which returns a subset of the keys for this Lock as an array
-   * @param _page the page of key owners requested when faceted by page size
-   * @param _pageSize the number of Key Owners requested per page
-   * @dev Throws if there are no key owners yet
-   */
-  function getOwnersByPage(
-    uint _page,
-    uint _pageSize
-  ) external view returns (address[] memory);
-
-  /**
-   * Checks if the given address owns the given tokenId.
-   * @param _tokenId The tokenId of the key to check
-   * @param _owner The potential key owners address
-   */
-  function isKeyOwner(
-    uint _tokenId,
-    address _owner
-  ) external view returns (bool);
-
-  /**
-   * @dev Returns the key's ExpirationTimestamp field for a given owner.
-   * @param _owner address of the user for whom we search the key
-   * @dev Throws if owner has never owned a key for this lock
-   */
-  function keyExpirationTimestampFor(
-    address _owner
-  ) external view returns (uint timestamp);
-
-  /**
-   * Public function which returns the total number of unique owners (both expired
-   * and valid).  This may be larger than totalSupply.
-   */
-  function numberOfOwners() external view returns (uint);
-
-  /**
-   * Allows the Lock owner to assign a descriptive name for this Lock.
-   * @param _lockName The new name for the lock
-   * @dev Throws if called by other than the lock owner
-   */
-  function updateLockName(string calldata _lockName) external;
-
-  /**
-   * Allows the Lock owner to assign a Symbol for this Lock.
-   * @param _lockSymbol The new Symbol for the lock
-   * @dev Throws if called by other than the lock owner
-   */
-  function updateLockSymbol(string calldata _lockSymbol) external;
-
-  /**
-   * @dev Gets the token symbol
-   * @return string representing the token symbol
-   */
-  function symbol() external view returns (string memory);
-
-  /**
-   * Allows the Lock owner to update the baseTokenURI for this Lock.
-   * @dev Throws if called by other than the lock owner
-   * @param _baseTokenURI String representing the base of the URI for this lock.
-   */
-  function setBaseTokenURI(string calldata _baseTokenURI) external;
-
-  /**  @notice A distinct Uniform Resource Identifier (URI) for a given asset.
-   * @dev Throws if `_tokenId` is not a valid NFT. URIs are defined in RFC
-   *  3986. The URI may point to a JSON file that conforms to the "ERC721
-   *  Metadata JSON Schema".
-   * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
-   * @param _tokenId The tokenID we're inquiring about
-   * @return String representing the URI for the requested token
-   */
-  function tokenURI(uint256 _tokenId) external view returns (string memory);
-
-  /**
-   * Allows the Lock owner to give a collection of users a key with no charge.
-   * Each key may be assigned a different expiration date.
-   * @dev Throws if called by other than the lock-owner
-   * @param _recipients An array of receiving addresses
-   * @param _expirationTimestamps An array of expiration Timestamps for the keys being granted
-   */
-  function grantKeys(
-    address[] calldata _recipients,
-    uint[] calldata _expirationTimestamps
-  ) external;
-
-  /**
-   * @dev Purchase function
-   * @param _value the number of tokens to pay for this purchase >= the current keyPrice - any applicable discount
-   * (_value is ignored when using ETH)
-   * @param _recipient address of the recipient of the purchased key
-   * @param _referrer address of the user making the referral
-   * @param _data arbitrary data populated by the front-end which initiated the sale
-   * @dev Throws if lock is disabled. Throws if lock is sold-out. Throws if _recipient == address(0).
-   * @dev Setting _value to keyPrice exactly doubles as a security feature. That way if the lock owner increases the
-   * price while my transaction is pending I can't be charged more than I expected (only applicable to ERC-20 when more
-   * than keyPrice is approved for spending).
-   */
-  function purchase(
-    uint256 _value,
-    address _recipient,
-    address _referrer,
-    bytes calldata _data
-  ) external payable;
-
-  /**
-   * Allow the Lock owner to change the transfer fee.
-   * @dev Throws if called by other than lock-owner
-   * @param _transferFeeBasisPoints The new transfer fee in basis-points(bps).
-   * Ex: 200 bps = 2%
-   */
-  function updateTransferFee(uint _transferFeeBasisPoints) external;
-
-  /**
-   * Determines how much of a fee a key owner would need to pay in order to
-   * transfer the key to another account.  This is pro-rated so the fee goes down
-   * overtime.
-   * @dev Throws if _owner does not have a valid key
-   * @param _owner The owner of the key check the transfer fee for.
-   * @param _time The amount of time to calculate the fee for.
-   * @return The transfer fee in seconds.
-   */
-  function getTransferFee(
-    address _owner,
-    uint _time
-  ) external view returns (uint);
-
-  /**
-   * @dev Invoked by the lock owner to destroy the user's key and perform a refund and cancellation of the key
-   * @param _keyOwner The key owner to whom we wish to send a refund to
-   * @param amount The amount to refund the key-owner
-   * @dev Throws if called by other than owner
-   * @dev Throws if _keyOwner does not have a valid key
-   */
-  function fullRefund(address _keyOwner, uint amount) external;
-
-  /**
-   * @notice Destroys the msg.sender's key and sends a refund based on the amount of time remaining.
-   */
-  function cancelAndRefund() external;
-
-  /**
-   * @dev Cancels a key owned by a different user and sends the funds to the msg.sender.
-   * @param _keyOwner this user's key will be canceled
-   * @param _v _r _s getCancelAndRefundApprovalHash signed by the _keyOwner
-   */
-  function cancelAndRefundFor(
-    address _keyOwner,
-    uint8 _v,
-    bytes32 _r,
-    bytes32 _s
-  ) external;
-
-  /**
-   * @notice Sets the minimum nonce for a valid off-chain approval message from the
-   * senders account.
-   * @dev This can be used to invalidate a previously signed message.
-   */
-  function invalidateOffchainApproval(uint _nextAvailableNonce) external;
-
-  /**
-   * Allow the owner to change the refund penalty.
-   * @dev Throws if called by other than owner
-   * @param _freeTrialLength The new duration of free trials for this lock
-   * @param _refundPenaltyBasisPoints The new refund penaly in basis-points(bps)
-   */
-  function updateRefundPenalty(
-    uint _freeTrialLength,
-    uint _refundPenaltyBasisPoints
-  ) external;
-
-  /**
-   * @dev Determines how much of a refund a key owner would receive if they issued
-   * @param _owner The key owner to get the refund value for.
-   * a cancelAndRefund block.timestamp.
-   * Note that due to the time required to mine a tx, the actual refund amount will be lower
-   * than what the user reads from this call.
-   */
-  function getCancelAndRefundValueFor(
-    address _owner
-  ) external view returns (uint refund);
-
-  function keyOwnerToNonce(address) external view returns (uint256);
-
-  /**
-   * @notice returns the hash to sign in order to allow another user to cancel on your behalf.
-   * @dev this can be computed in JS instead of read from the contract.
-   * @param _keyOwner The key owner's address (also the message signer)
-   * @param _txSender The address cancelling cancel on behalf of the keyOwner
-   * @return approvalHash The hash to sign
-   */
-  function getCancelAndRefundApprovalHash(
-    address _keyOwner,
-    address _txSender
-  ) external view returns (bytes32 approvalHash);
-
-  ///===================================================================
-  /// Auto-generated getter functions from public state variables
-
-  function beneficiary() external view returns (address);
-
-  function erc1820() external view returns (address);
-
-  function expirationDuration() external view returns (uint256);
-
-  function freeTrialLength() external view returns (uint256);
-
-  function isAlive() external view returns (bool);
-
-  function keyCancelInterfaceId() external view returns (bytes32);
-
-  function keySoldInterfaceId() external view returns (bytes32);
-
-  function keyPrice() external view returns (uint256);
-
-  function maxNumberOfKeys() external view returns (uint256);
-
-  function owners(uint256) external view returns (address);
-
-  function refundPenaltyBasisPoints() external view returns (uint256);
-
-  function tokenAddress() external view returns (address);
-
-  function transferFeeBasisPoints() external view returns (uint256);
-
-  function unlockProtocol() external view returns (address);
-
-  function BASIS_POINTS_DEN() external view returns (uint256);
-
-  /// @notice The typehash per the EIP-712 standard
-  /// @dev This can be computed in JS instead of read from the contract
-  function CANCEL_TYPEHASH() external view returns (bytes32);
-
-  ///===================================================================
-
-  /**
-   * @notice Allows the key owner to safely share their key (parent key) by
-   * transferring a portion of the remaining time to a new key (child key).
-   * @dev Throws if key is not valid.
-   * @dev Throws if `_to` is the zero address
-   * @param _to The recipient of the shared key
-   * @param _tokenId the key to share
-   * @param _timeShared The amount of time shared
-   * checks if `_to` is a smart contract (code size > 0). If so, it calls
-   * `onERC721Received` on `_to` and throws if the return value is not
-   * `bytes4(keccak256('onERC721Received(address,address,uint,bytes)'))`.
-   * @dev Emit Transfer event
-   */
-  function shareKey(address _to, uint _tokenId, uint _timeShared) external;
-
-  /// @notice A descriptive name for a collection of NFTs in this contract
-  function name() external view returns (string memory _name);
-
-  ///===================================================================
-
-  /// From Openzeppelin's Ownable.sol
-  function owner() external view returns (address);
-
-  function isOwner() external view returns (bool);
-
-  function renounceOwnership() external;
-
-  function transferOwnership(address newOwner) external;
-
-  ///===================================================================
-
-  /// From ERC165.sol
-  function supportsInterface(bytes4 interfaceId) external view returns (bool);
-  ///===================================================================
-}
-
-// File contracts/interfaces/IUnlock.sol
-
-pragma solidity 0.5.14;
-
-/**
- * @title The Unlock Interface
- **/
-
-interface IUnlock {
-  // Events
-  event NewLock(address indexed lockOwner, address indexed newLockAddress);
-
-  event ConfigUnlock(
-    address publicLockAddress,
-    string globalTokenSymbol,
-    string globalTokenURI
-  );
-
-  event ResetTrackedValue(uint grossNetworkProduct, uint totalDiscountGranted);
-
-  // Use initialize instead of a constructor to support proxies (for upgradeability via zos).
-  function initialize(address _owner) external;
-
-  /**
-   * @dev Create lock
-   * This deploys a lock for a creator. It also keeps track of the deployed lock.
-   * @param _tokenAddress set to the ERC20 token address, or 0 for ETH.
-   * @param _salt an identifier for the Lock, which is unique for the user.
-   * This may be implemented as a sequence ID or with RNG. It's used with `create2`
-   * to know the lock's address before the transaction is mined.
-   */
-  function createLock(
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys,
-    string calldata _lockName,
-    bytes12 _salt
-  ) external;
-
-  /**
-   * This function keeps track of the added GDP, as well as grants of discount tokens
-   * to the referrer, if applicable.
-   * The number of discount tokens granted is based on the value of the referal,
-   * the current growth rate and the lock's discount token distribution rate
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordKeyPurchase(
-    uint _value,
-    address _referrer // solhint-disable-line no-unused-vars
-  ) external;
-
-  /**
-   * This function will keep track of consumed discounts by a given user.
-   * It will also grant discount tokens to the creator who is granting the discount based on the
-   * amount of discount and compensation rate.
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordConsumedDiscount(
-    uint _discount,
-    uint _tokens // solhint-disable-line no-unused-vars
-  ) external;
-
-  /**
-   * This function returns the discount available for a user, when purchasing a
-   * a key from a lock.
-   * This does not modify the state. It returns both the discount and the number of tokens
-   * consumed to grant that discount.
-   */
-  function computeAvailableDiscountFor(
-    address _purchaser, // solhint-disable-line no-unused-vars
-    uint _keyPrice // solhint-disable-line no-unused-vars
-  ) external view returns (uint discount, uint tokens);
-
-  // Function to read the globalTokenURI field.
-  function globalBaseTokenURI() external view returns (string memory);
-
-  // Function to read the globalTokenSymbol field.
-  function globalTokenSymbol() external view returns (string memory);
-
-  /** Function for the owner to update configuration variables.
-   *  Should throw if called by other than owner.
-   */
-  function configUnlock(
-    address _publicLockAddress,
-    string calldata _symbol,
-    string calldata _URI
-  ) external;
-
-  // Allows the owner to change the value tracking variables as needed.
-  function resetTrackedValue(
-    uint _grossNetworkProduct,
-    uint _totalDiscountGranted
-  ) external;
-}
-
-// File contracts/interfaces/IUniswap.sol
-
-pragma solidity 0.5.14;
-
-/// @title Functions from the uniswap contract interface
-
-interface IUniswap {
-  function getTokenToEthInputPrice(uint tokens_sold) external returns (uint256);
-}
-
-// File @openzeppelin/contracts-ethereum-package/contracts/utils/Address.sol@v2.4.0
-
-pragma solidity ^0.5.5;
-
-/**
- * @dev Collection of functions related to the address type
- */
-library Address {
-  /**
-   * @dev Returns true if `account` is a contract.
-   *
-   * This test is non-exhaustive, and there may be false-negatives: during the
-   * execution of a contract's constructor, its address will be reported as
-   * not containing a contract.
-   *
-   * IMPORTANT: It is unsafe to assume that an address for which this
-   * function returns false is an externally-owned account (EOA) and not a
-   * contract.
-   */
-  function isContract(address account) internal view returns (bool) {
-    // This method relies in extcodesize, which returns 0 for contracts in
-    // construction, since the code is only stored at the end of the
-    // constructor execution.
-
-    // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
-    // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
-    // for accounts without code, i.e. `keccak256('')`
-    bytes32 codehash;
-    bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
-    // solhint-disable-next-line no-inline-assembly
-    assembly {
-      codehash := extcodehash(account)
-    }
-    return (codehash != 0x0 && codehash != accountHash);
-  }
-
-  /**
-   * @dev Converts an `address` into `address payable`. Note that this is
-   * simply a type cast: the actual underlying value is not changed.
-   *
-   * _Available since v2.4.0._
-   */
-  function toPayable(address account) internal pure returns (address payable) {
-    return address(uint160(account));
-  }
-
-  /**
-   * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
-   * `recipient`, forwarding all available gas and reverting on errors.
-   *
-   * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
-   * of certain opcodes, possibly making contracts go over the 2300 gas limit
-   * imposed by `transfer`, making them unable to receive funds via
-   * `transfer`. {sendValue} removes this limitation.
-   *
-   * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
-   *
-   * IMPORTANT: because control is transferred to `recipient`, care must be
-   * taken to not create reentrancy vulnerabilities. Consider using
-   * {ReentrancyGuard} or the
-   * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
-   *
-   * _Available since v2.4.0._
-   */
-  function sendValue(address payable recipient, uint256 amount) internal {
-    require(address(this).balance >= amount, "Address: insufficient balance");
-
-    // solhint-disable-next-line avoid-call-value
-    (bool success, ) = recipient.call.value(amount)("");
-    require(
-      success,
-      "Address: unable to send value, recipient may have reverted"
-    );
-  }
-}
-
-// File contracts/Unlock.sol
-
-pragma solidity 0.5.14;
-
-/**
- * @title The Unlock contract
- * @author Julien Genestoux (unlock-protocol.com)
- * This smart contract has 3 main roles:
- *  1. Distribute discounts to discount token holders
- *  2. Grant dicount tokens to users making referrals and/or publishers granting discounts.
- *  3. Create & deploy Public Lock contracts.
- * In order to achieve these 3 elements, it keeps track of several things such as
- *  a. Deployed locks addresses and balances of discount tokens granted by each lock.
- *  b. The total network product (sum of all key sales, net of discounts)
- *  c. Total of discounts granted
- *  d. Balances of discount tokens, including 'frozen' tokens (which have been used to claim
- * discounts and cannot be used/transferred for a given period)
- *  e. Growth rate of Network Product
- *  f. Growth rate of Discount tokens supply
- * The smart contract has an owner who only can perform the following
- *  - Upgrades
- *  - Change in golden rules (20% of GDP available in discounts, and supply growth rate is at most
- * 50% of GNP growth rate)
- * NOTE: This smart contract is partially implemented for now until enough Locks are deployed and
- * in the wild.
- * The partial implementation includes the following features:
- *  a. Keeping track of deployed locks
- *  b. Keeping track of GNP
- */
-
-/// @dev Must list the direct base contracts in the order from “most base-like” to “most derived”.
-/// https://solidity.readthedocs.io/en/latest/contracts.html#multiple-inheritance-and-linearization
-contract Unlock is IUnlock, Initializable, Ownable {
-  using Address for address;
-  using Clone2Factory for address;
-
-  /**
-   * The struct for a lock
-   * We use deployed to keep track of deployments.
-   * This is required because both totalSales and yieldedDiscountTokens are 0 when initialized,
-   * which would be the same values when the lock is not set.
-   */
-  struct LockBalances {
-    bool deployed;
-    uint totalSales; // This is in wei
-    uint yieldedDiscountTokens;
-  }
-
-  modifier onlyFromDeployedLock() {
-    require(locks[msg.sender].deployed, "ONLY_LOCKS");
-    _;
-  }
-
-  uint public grossNetworkProduct;
-
-  uint public totalDiscountGranted;
-
-  // We keep track of deployed locks to ensure that callers are all deployed locks.
-  mapping(address => LockBalances) public locks;
-
-  // global base token URI
-  // Used by locks where the owner has not set a custom base URI.
-  string public globalBaseTokenURI;
-
-  // global base token symbol
-  // Used by locks where the owner has not set a custom symbol
-  string public globalTokenSymbol;
-
-  // The address of the public lock template, used when `createLock` is called
-  address public publicLockAddress;
-
-  // Map token address to exchange contract address if the token is supported
-  // Used for GDP calculations
-  mapping(address => IUniswap) public uniswapExchanges;
-
-  // Use initialize instead of a constructor to support proxies (for upgradeability via zos).
-  function initialize(address _owner) public initializer {
-    // We must manually initialize Ownable.sol
-    Ownable.initialize(_owner);
-  }
-
-  /**
-   * @dev Create lock
-   * This deploys a lock for a creator. It also keeps track of the deployed lock.
-   * @param _tokenAddress set to the ERC20 token address, or 0 for ETH.
-   * @param _salt an identifier for the Lock, which is unique for the user.
-   * This may be implemented as a sequence ID or with RNG. It's used with `create2`
-   * to know the lock's address before the transaction is mined.
-   */
-  function createLock(
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys,
-    string memory _lockName,
-    bytes12 _salt
-  ) public {
-    require(publicLockAddress != address(0), "MISSING_LOCK_TEMPLATE");
-
-    // create lock
-    address newLock = publicLockAddress._createClone2(_salt);
-    IPublicLock(newLock).initialize(
-      msg.sender,
-      _expirationDuration,
-      _tokenAddress,
-      _keyPrice,
-      _maxNumberOfKeys,
-      _lockName
-    );
-
-    // Assign the new Lock
-    locks[newLock] = LockBalances({
-      deployed: true,
-      totalSales: 0,
-      yieldedDiscountTokens: 0
-    });
-
-    // trigger event
-    emit NewLock(msg.sender, newLock);
-  }
-
-  /**
-   * This function returns the discount available for a user, when purchasing a
-   * a key from a lock.
-   * This does not modify the state. It returns both the discount and the number of tokens
-   * consumed to grant that discount.
-   * TODO: actually implement this.
-   */
-  function computeAvailableDiscountFor(
-    address _purchaser, // solhint-disable-line no-unused-vars
-    uint _keyPrice // solhint-disable-line no-unused-vars
-  ) public view returns (uint discount, uint tokens) {
-    // TODO: implement me
-    return (0, 0);
-  }
-
-  /**
-   * This function keeps track of the added GDP, as well as grants of discount tokens
-   * to the referrer, if applicable.
-   * The number of discount tokens granted is based on the value of the referal,
-   * the current growth rate and the lock's discount token distribution rate
-   * This function is invoked by a previously deployed lock only.
-   * TODO: actually implement
-   */
-  function recordKeyPurchase(
-    uint _value,
-    address _referrer // solhint-disable-line no-unused-vars
-  ) public onlyFromDeployedLock {
-    if (_value > 0) {
-      uint valueInETH;
-      address tokenAddress = IPublicLock(msg.sender).tokenAddress();
-      if (tokenAddress != address(0)) {
-        // If priced in an ERC-20 token, find the supported uniswap exchange
-        IUniswap exchange = uniswapExchanges[tokenAddress];
-        if (address(exchange) != address(0)) {
-          valueInETH = exchange.getTokenToEthInputPrice(_value);
-        } else {
-          // If the token type is not supported, assume 0 value
-          valueInETH = 0;
-        }
-      } else {
-        // If priced in ETH (or value is 0), no conversion is required
-        valueInETH = _value;
-      }
-
-      grossNetworkProduct += valueInETH;
-      locks[msg.sender].totalSales += valueInETH;
-    }
-  }
-
-  /**
-   * This function will keep track of consumed discounts by a given user.
-   * It will also grant discount tokens to the creator who is granting the discount based on the
-   * amount of discount and compensation rate.
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordConsumedDiscount(
-    uint _discount,
-    uint _tokens // solhint-disable-line no-unused-vars
-  ) public onlyFromDeployedLock {
-    // TODO: implement me
-    totalDiscountGranted += _discount;
-    return;
-  }
-
-  // The version number of the current Unlock implementation on this network
-  function unlockVersion() external pure returns (uint16) {
-    return 6;
-  }
-
-  // function for the owner to update configuration variables
-  function configUnlock(
-    address _publicLockAddress,
-    string calldata _symbol,
-    string calldata _URI
-  ) external onlyOwner {
-    // ensure that this is an address to which a contract has been deployed.
-    require(_publicLockAddress.isContract(), "NOT_A_CONTRACT");
-    publicLockAddress = _publicLockAddress;
-    globalTokenSymbol = _symbol;
-    globalBaseTokenURI = _URI;
-
-    emit ConfigUnlock(_publicLockAddress, _symbol, _URI);
-  }
-
-  // allows the owner to set the exchange address to use for value conversions
-  // setting the _exchangeAddress to address(0) removes support for the token
-  function setExchange(
-    address _tokenAddress,
-    address _exchangeAddress
-  ) external onlyOwner {
-    uniswapExchanges[_tokenAddress] = IUniswap(_exchangeAddress);
-  }
-
-  // Allows the owner to change the value tracking variables as needed.
-  function resetTrackedValue(
-    uint _grossNetworkProduct,
-    uint _totalDiscountGranted
-  ) external onlyOwner {
-    grossNetworkProduct = _grossNetworkProduct;
-    totalDiscountGranted = _totalDiscountGranted;
-
-    emit ResetTrackedValue(_grossNetworkProduct, _totalDiscountGranted);
-  }
-}
diff --git a/packages/contracts/src/contracts/Unlock/UnlockV7.sol b/packages/contracts/src/contracts/Unlock/UnlockV7.sol
deleted file mode 100644
index 3270144a866..00000000000
--- a/packages/contracts/src/contracts/Unlock/UnlockV7.sol
+++ /dev/null
@@ -1,1438 +0,0 @@
-// Sources flattened with hardhat v2.4.1 https://hardhat.org
-
-// File @openzeppelin/upgrades/contracts/Initializable.sol@v2.7.1
-
-pragma solidity >=0.4.24 <0.7.0;
-
-/**
- * @title Initializable
- *
- * @dev Helper contract to support initializer functions. To use it, replace
- * the constructor with a function that has the `initializer` modifier.
- * WARNING: Unlike constructors, initializer functions must be manually
- * invoked. This applies both to deploying an Initializable contract, as well
- * as extending an Initializable contract via inheritance.
- * WARNING: When used with inheritance, manual care must be taken to not invoke
- * a parent initializer twice, or ensure that all initializers are idempotent,
- * because this is not dealt with automatically as with constructors.
- */
-contract Initializable {
-  /**
-   * @dev Indicates that the contract has been initialized.
-   */
-  bool private initialized;
-
-  /**
-   * @dev Indicates that the contract is in the process of being initialized.
-   */
-  bool private initializing;
-
-  /**
-   * @dev Modifier to use in the initializer function of a contract.
-   */
-  modifier initializer() {
-    require(
-      initializing || isConstructor() || !initialized,
-      "Contract instance has already been initialized"
-    );
-
-    bool isTopLevelCall = !initializing;
-    if (isTopLevelCall) {
-      initializing = true;
-      initialized = true;
-    }
-
-    _;
-
-    if (isTopLevelCall) {
-      initializing = false;
-    }
-  }
-
-  /// @dev Returns true if and only if the function is running in the constructor
-  function isConstructor() private view returns (bool) {
-    // extcodesize checks the size of the code stored in an address, and
-    // address returns the current address. Since the code is still not
-    // deployed when running a constructor, any checks on its code size will
-    // yield zero, making it an effective way to detect if a contract is
-    // under construction or not.
-    address self = address(this);
-    uint256 cs;
-    assembly {
-      cs := extcodesize(self)
-    }
-    return cs == 0;
-  }
-
-  // Reserved storage space to allow for layout changes in the future.
-  uint256[50] private ______gap;
-}
-
-// File @openzeppelin/contracts-ethereum-package/contracts/GSN/Context.sol@v2.4.0
-
-pragma solidity ^0.5.0;
-
-/*
- * @dev Provides information about the current execution context, including the
- * sender of the transaction and its data. While these are generally available
- * via msg.sender and msg.data, they should not be accessed in such a direct
- * manner, since when dealing with GSN meta-transactions the account sending and
- * paying for execution may not be the actual sender (as far as an application
- * is concerned).
- *
- * This contract is only required for intermediate, library-like contracts.
- */
-contract Context is Initializable {
-  // Empty internal constructor, to prevent people from mistakenly deploying
-  // an instance of this contract, which should be used via inheritance.
-  constructor() internal {}
-
-  // solhint-disable-previous-line no-empty-blocks
-
-  function _msgSender() internal view returns (address payable) {
-    return msg.sender;
-  }
-
-  function _msgData() internal view returns (bytes memory) {
-    this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
-    return msg.data;
-  }
-}
-
-// File @openzeppelin/contracts-ethereum-package/contracts/ownership/Ownable.sol@v2.4.0
-
-pragma solidity ^0.5.0;
-
-/**
- * @dev Contract module which provides a basic access control mechanism, where
- * there is an account (an owner) that can be granted exclusive access to
- * specific functions.
- *
- * This module is used through inheritance. It will make available the modifier
- * `onlyOwner`, which can be aplied to your functions to restrict their use to
- * the owner.
- */
-contract Ownable is Initializable, Context {
-  address private _owner;
-
-  event OwnershipTransferred(
-    address indexed previousOwner,
-    address indexed newOwner
-  );
-
-  /**
-   * @dev Initializes the contract setting the deployer as the initial owner.
-   */
-  function initialize(address sender) public initializer {
-    _owner = sender;
-    emit OwnershipTransferred(address(0), _owner);
-  }
-
-  /**
-   * @dev Returns the address of the current owner.
-   */
-  function owner() public view returns (address) {
-    return _owner;
-  }
-
-  /**
-   * @dev Throws if called by any account other than the owner.
-   */
-  modifier onlyOwner() {
-    require(isOwner(), "Ownable: caller is not the owner");
-    _;
-  }
-
-  /**
-   * @dev Returns true if the caller is the current owner.
-   */
-  function isOwner() public view returns (bool) {
-    return _msgSender() == _owner;
-  }
-
-  /**
-   * @dev Leaves the contract without owner. It will not be possible to call
-   * `onlyOwner` functions anymore. Can only be called by the current owner.
-   *
-   * > Note: Renouncing ownership will leave the contract without an owner,
-   * thereby removing any functionality that is only available to the owner.
-   */
-  function renounceOwnership() public onlyOwner {
-    emit OwnershipTransferred(_owner, address(0));
-    _owner = address(0);
-  }
-
-  /**
-   * @dev Transfers ownership of the contract to a new account (`newOwner`).
-   * Can only be called by the current owner.
-   */
-  function transferOwnership(address newOwner) public onlyOwner {
-    _transferOwnership(newOwner);
-  }
-
-  /**
-   * @dev Transfers ownership of the contract to a new account (`newOwner`).
-   */
-  function _transferOwnership(address newOwner) internal {
-    require(newOwner != address(0), "Ownable: new owner is the zero address");
-    emit OwnershipTransferred(_owner, newOwner);
-    _owner = newOwner;
-  }
-
-  uint256[50] private ______gap;
-}
-
-// File hardlydifficult-ethereum-contracts/contracts/proxies/Clone2Factory.sol@v0.9.3
-
-pragma solidity ^0.5.0;
-
-// From https://github.com/optionality/clone-factory/blob/master/contracts/CloneFactory.sol
-// Updated to support Solidity 5, switch to `create2` and revert on fail
-library Clone2Factory {
-  /**
-   * @notice Uses create2 to deploy a clone to a pre-determined address.
-   * @param target the address of the template contract, containing the logic for this contract.
-   * @param salt a salt used to determine the contract address before the transaction is mined,
-   * may be random or sequential.
-   * @return proxyAddress the address of the newly deployed contract.
-   * @dev Using `bytes12` for the salt saves 6 gas over using `uint96` (requires another shift).
-   * Will revert on fail.
-   */
-  function _createClone2(
-    address target,
-    bytes12 salt
-  ) internal returns (address proxyAddress) {
-    // solium-disable-next-line
-    assembly {
-      let pointer := mload(0x40)
-
-      // Create the bytecode for deployment based on the Minimal Proxy Standard (EIP-1167)
-      // bytecode: 0x0
-      mstore(
-        pointer,
-        0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000
-      )
-      mstore(add(pointer, 0x14), shl(96, target))
-      mstore(
-        add(pointer, 0x28),
-        0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000
-      )
-
-      // `create2` consumes all available gas if called with a salt that's already been consumed
-      // we check if the address is available first so that doesn't happen
-      // Costs ~958 gas
-
-      // Calculate the hash
-      let contractCodeHash := keccak256(pointer, 0x37)
-
-      // salt: 0x100
-      // The salt to use with the create2 call is `msg.sender+salt`
-      // this prevents at attacker from front-running another user's deployment
-      mstore(add(pointer, 0x100), shl(96, caller))
-      mstore(add(pointer, 0x114), salt)
-
-      // addressSeed: 0x40
-      // 0xff
-      mstore(
-        add(pointer, 0x40),
-        0xff00000000000000000000000000000000000000000000000000000000000000
-      )
-      // this
-      mstore(add(pointer, 0x41), shl(96, address))
-      // salt
-      mstore(add(pointer, 0x55), mload(add(pointer, 0x100)))
-      // hash
-      mstore(add(pointer, 0x75), contractCodeHash)
-
-      proxyAddress := keccak256(add(pointer, 0x40), 0x55)
-
-      switch extcodesize(proxyAddress)
-      case 0 {
-        // Deploy the contract, returning the address or 0 on fail
-        proxyAddress := create2(0, pointer, 0x37, mload(add(pointer, 0x100)))
-      }
-      default {
-        proxyAddress := 0
-      }
-    }
-
-    // Revert if the deployment fails (possible if salt was already used)
-    require(proxyAddress != address(0), "PROXY_DEPLOY_FAILED");
-  }
-}
-
-// File hardlydifficult-ethereum-contracts/contracts/interfaces/IUniswapExchange.sol@v0.9.3
-
-pragma solidity ^0.5.0;
-
-// Source: https://github.com/Uniswap/contracts-vyper/blob/master/contracts/uniswap_exchange.vy
-// The fallback function is payable and calls `ethToTokenInput`
-interface IUniswapExchange {
-  // Events
-  event AddLiquidity(
-    address indexed provider,
-    uint indexed eth_amount,
-    uint indexed token_amount
-  );
-  event Approval(address indexed _owner, address indexed _spender, uint _value);
-  event EthPurchase(
-    address indexed buyer,
-    uint indexed tokens_sold,
-    uint eth_bought
-  );
-  event RemoveLiquidity(
-    address indexed provider,
-    uint indexed eth_amount,
-    uint indexed token_amount
-  );
-  event TokenPurchase(
-    address indexed buyer,
-    uint indexed eth_sold,
-    uint indexed tokens_bought
-  );
-  event Transfer(address indexed _from, address indexed _to, uint _value);
-
-  // Read-only
-  function allowance(
-    address _owner,
-    address _spender
-  ) external view returns (uint);
-
-  function balanceOf(address _owner) external view returns (uint);
-
-  function decimals() external view returns (uint);
-
-  function factoryAddress() external view returns (address);
-
-  function getEthToTokenInputPrice(uint eth_sold) external view returns (uint);
-
-  function getEthToTokenOutputPrice(
-    uint tokens_bought
-  ) external view returns (uint);
-
-  function getTokenToEthInputPrice(
-    uint tokens_sold
-  ) external view returns (uint);
-
-  function getTokenToEthOutputPrice(
-    uint eth_bought
-  ) external view returns (uint);
-
-  function name() external view returns (bytes32);
-
-  function symbol() external view returns (bytes32);
-
-  function tokenAddress() external view returns (address);
-
-  function totalSupply() external view returns (uint);
-
-  // Transactions
-  function setup(address token_addr) external;
-
-  function addLiquidity(
-    uint min_liquidity,
-    uint max_tokens,
-    uint deadline
-  ) external payable returns (uint);
-
-  function removeLiquidity(
-    uint amount,
-    uint min_eth,
-    uint min_tokens,
-    uint deadline
-  ) external returns (uint, uint);
-
-  function ethToTokenSwapInput(
-    uint min_tokens,
-    uint deadline
-  ) external payable returns (uint);
-
-  function ethToTokenTransferInput(
-    uint min_tokens,
-    uint deadline,
-    address recipient
-  ) external payable returns (uint);
-
-  function ethToTokenSwapOutput(
-    uint tokens_bought,
-    uint deadline
-  ) external payable returns (uint);
-
-  function ethToTokenTransferOutput(
-    uint tokens_bought,
-    uint deadline,
-    address recipient
-  ) external payable returns (uint);
-
-  function tokenToEthSwapInput(
-    uint tokens_sold,
-    uint min_eth,
-    uint deadline
-  ) external returns (uint);
-
-  function tokenToEthTransferInput(
-    uint tokens_sold,
-    uint min_eth,
-    uint deadline,
-    address recipient
-  ) external returns (uint);
-
-  function tokenToEthSwapOutput(
-    uint eth_bought,
-    uint max_tokens,
-    uint deadline
-  ) external returns (uint);
-
-  function tokenToEthTransferOutput(
-    uint eth_bought,
-    uint max_tokens,
-    uint deadline,
-    address recipient
-  ) external returns (uint);
-
-  function tokenToTokenSwapInput(
-    uint tokens_sold,
-    uint min_tokens_bought,
-    uint min_eth_bought,
-    uint deadline,
-    address token_addr
-  ) external returns (uint);
-
-  function tokenToTokenTransferInput(
-    uint tokens_sold,
-    uint min_tokens_bought,
-    uint min_eth_bought,
-    uint deadline,
-    address recipient,
-    address token_addr
-  ) external returns (uint);
-
-  function tokenToTokenSwapOutput(
-    uint tokens_bought,
-    uint max_tokens_sold,
-    uint max_eth_sold,
-    uint deadline,
-    address token_addr
-  ) external returns (uint);
-
-  function tokenToTokenTransferOutput(
-    uint tokens_bought,
-    uint max_tokens_sold,
-    uint max_eth_sold,
-    uint deadline,
-    address recipient,
-    address token_addr
-  ) external returns (uint);
-
-  function tokenToExchangeSwapInput(
-    uint tokens_sold,
-    uint min_tokens_bought,
-    uint min_eth_bought,
-    uint deadline,
-    address exchange_addr
-  ) external returns (uint);
-
-  function tokenToExchangeTransferInput(
-    uint tokens_sold,
-    uint min_tokens_bought,
-    uint min_eth_bought,
-    uint deadline,
-    address recipient,
-    address exchange_addr
-  ) external returns (uint);
-
-  function tokenToExchangeSwapOutput(
-    uint tokens_bought,
-    uint max_tokens_sold,
-    uint max_eth_sold,
-    uint deadline,
-    address exchange_addr
-  ) external returns (uint);
-
-  function tokenToExchangeTransferOutput(
-    uint tokens_bought,
-    uint max_tokens_sold,
-    uint max_eth_sold,
-    uint deadline,
-    address recipient,
-    address exchange_addr
-  ) external returns (uint);
-
-  function transfer(address _to, uint _value) external returns (bool);
-
-  function transferFrom(
-    address _from,
-    address _to,
-    uint _value
-  ) external returns (bool);
-
-  function approve(address _spender, uint _value) external returns (bool);
-}
-
-// File contracts/interfaces/IPublicLock.sol
-
-pragma solidity 0.5.17;
-
-/**
- * @title The PublicLock Interface
- */
-
-contract IPublicLock {
-  // See indentationissue description here:
-  // https://github.com/duaraghav8/Ethlint/issues/268
-  // solium-disable indentation
-
-  /// Functions
-
-  function initialize(
-    address _lockCreator,
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys,
-    string calldata _lockName
-  ) external;
-
-  /**
-   * @notice Allow the contract to accept tips in ETH sent directly to the contract.
-   * @dev This is okay to use even if the lock is priced in ERC-20 tokens
-   */
-  function() external payable;
-
-  /**
-   * @dev Never used directly
-   */
-  function initialize() external;
-
-  /**
-   * @notice The version number of the current implementation on this network.
-   * @return The current version number.
-   */
-  function publicLockVersion() public pure returns (uint);
-
-  /**
-   * @notice Gets the current balance of the account provided.
-   * @param _tokenAddress The token type to retrieve the balance of.
-   * @param _account The account to get the balance of.
-   * @return The number of tokens of the given type for the given address, possibly 0.
-   */
-  function getBalance(
-    address _tokenAddress,
-    address _account
-  ) external view returns (uint);
-
-  /**
-   * @notice Used to disable lock before migrating keys and/or destroying contract.
-   * @dev Throws if called by other than a lock manager.
-   * @dev Throws if lock contract has already been disabled.
-   */
-  function disableLock() external;
-
-  /**
-   * @dev Called by a lock manager or beneficiary to withdraw all funds from the lock and send them to the `beneficiary`.
-   * @dev Throws if called by other than a lock manager or beneficiary
-   * @param _tokenAddress specifies the token address to withdraw or 0 for ETH. This is usually
-   * the same as `tokenAddress` in MixinFunds.
-   * @param _amount specifies the max amount to withdraw, which may be reduced when
-   * considering the available balance. Set to 0 or MAX_UINT to withdraw everything.
-   *  -- however be wary of draining funds as it breaks the `cancelAndRefund` and `expireAndRefundFor`
-   * use cases.
-   */
-  function withdraw(address _tokenAddress, uint _amount) external;
-
-  /**
-   * A function which lets a Lock manager of the lock to change the price for future purchases.
-   * @dev Throws if called by other than a Lock manager
-   * @dev Throws if lock has been disabled
-   * @dev Throws if _tokenAddress is not a valid token
-   * @param _keyPrice The new price to set for keys
-   * @param _tokenAddress The address of the erc20 token to use for pricing the keys,
-   * or 0 to use ETH
-   */
-  function updateKeyPricing(uint _keyPrice, address _tokenAddress) external;
-
-  /**
-   * A function which lets a Lock manager update the beneficiary account,
-   * which receives funds on withdrawal.
-   * @dev Throws if called by other than a Lock manager or beneficiary
-   * @dev Throws if _beneficiary is address(0)
-   * @param _beneficiary The new address to set as the beneficiary
-   */
-  function updateBeneficiary(address _beneficiary) external;
-
-  /**
-   * Checks if the user has a non-expired key.
-   * @param _user The address of the key owner
-   */
-  function getHasValidKey(address _user) external view returns (bool);
-
-  /**
-   * @notice Find the tokenId for a given user
-   * @return The tokenId of the NFT, else returns 0
-   * @param _account The address of the key owner
-   */
-  function getTokenIdFor(address _account) external view returns (uint);
-
-  /**
-   * A function which returns a subset of the keys for this Lock as an array
-   * @param _page the page of key owners requested when faceted by page size
-   * @param _pageSize the number of Key Owners requested per page
-   * @dev Throws if there are no key owners yet
-   */
-  function getOwnersByPage(
-    uint _page,
-    uint _pageSize
-  ) external view returns (address[] memory);
-
-  /**
-   * Checks if the given address owns the given tokenId.
-   * @param _tokenId The tokenId of the key to check
-   * @param _keyOwner The potential key owners address
-   */
-  function isKeyOwner(
-    uint _tokenId,
-    address _keyOwner
-  ) external view returns (bool);
-
-  /**
-   * @dev Returns the key's ExpirationTimestamp field for a given owner.
-   * @param _keyOwner address of the user for whom we search the key
-   * @dev Returns 0 if the owner has never owned a key for this lock
-   */
-  function keyExpirationTimestampFor(
-    address _keyOwner
-  ) external view returns (uint timestamp);
-
-  /**
-   * Public function which returns the total number of unique owners (both expired
-   * and valid).  This may be larger than totalSupply.
-   */
-  function numberOfOwners() external view returns (uint);
-
-  /**
-   * Allows a Lock manager to assign a descriptive name for this Lock.
-   * @param _lockName The new name for the lock
-   * @dev Throws if called by other than a Lock manager
-   */
-  function updateLockName(string calldata _lockName) external;
-
-  /**
-   * Allows a Lock manager to assign a Symbol for this Lock.
-   * @param _lockSymbol The new Symbol for the lock
-   * @dev Throws if called by other than a Lock manager
-   */
-  function updateLockSymbol(string calldata _lockSymbol) external;
-
-  /**
-   * @dev Gets the token symbol
-   * @return string representing the token symbol
-   */
-  function symbol() external view returns (string memory);
-
-  /**
-   * Allows a Lock manager to update the baseTokenURI for this Lock.
-   * @dev Throws if called by other than a Lock manager
-   * @param _baseTokenURI String representing the base of the URI for this lock.
-   */
-  function setBaseTokenURI(string calldata _baseTokenURI) external;
-
-  /**  @notice A distinct Uniform Resource Identifier (URI) for a given asset.
-   * @dev Throws if `_tokenId` is not a valid NFT. URIs are defined in RFC
-   *  3986. The URI may point to a JSON file that conforms to the "ERC721
-   *  Metadata JSON Schema".
-   * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
-   * @param _tokenId The tokenID we're inquiring about
-   * @return String representing the URI for the requested token
-   */
-  function tokenURI(uint256 _tokenId) external view returns (string memory);
-
-  /**
-   * Allows a Lock manager to add or remove an event hook
-   * @param _onKeyPurchaseHook Hook called when the `purchase` function is called
-   * @param _onKeyCancelHook Hook called when the internal `_cancelAndRefund` function is called
-   */
-  function setEventHooks(
-    address _onKeyPurchaseHook,
-    address _onKeyCancelHook
-  ) external;
-
-  /**
-   * Allows a Lock manager to give a collection of users a key with no charge.
-   * Each key may be assigned a different expiration date.
-   * @dev Throws if called by other than a Lock manager
-   * @param _recipients An array of receiving addresses
-   * @param _expirationTimestamps An array of expiration Timestamps for the keys being granted
-   */
-  function grantKeys(
-    address[] calldata _recipients,
-    uint[] calldata _expirationTimestamps,
-    address[] calldata _keyManagers
-  ) external;
-
-  /**
-   * @dev Purchase function
-   * @param _value the number of tokens to pay for this purchase >= the current keyPrice - any applicable discount
-   * (_value is ignored when using ETH)
-   * @param _recipient address of the recipient of the purchased key
-   * @param _referrer address of the user making the referral
-   * @param _data arbitrary data populated by the front-end which initiated the sale
-   * @dev Throws if lock is disabled. Throws if lock is sold-out. Throws if _recipient == address(0).
-   * @dev Setting _value to keyPrice exactly doubles as a security feature. That way if a Lock manager increases the
-   * price while my transaction is pending I can't be charged more than I expected (only applicable to ERC-20 when more
-   * than keyPrice is approved for spending).
-   */
-  function purchase(
-    uint256 _value,
-    address _recipient,
-    address _referrer,
-    bytes calldata _data
-  ) external payable;
-
-  /**
-   * @notice returns the minimum price paid for a purchase with these params.
-   * @dev this considers any discount from Unlock or the OnKeyPurchase hook.
-   */
-  function purchasePriceFor(
-    address _recipient,
-    address _referrer,
-    bytes calldata _data
-  ) external view returns (uint);
-
-  /**
-   * Allow a Lock manager to change the transfer fee.
-   * @dev Throws if called by other than a Lock manager
-   * @param _transferFeeBasisPoints The new transfer fee in basis-points(bps).
-   * Ex: 200 bps = 2%
-   */
-  function updateTransferFee(uint _transferFeeBasisPoints) external;
-
-  /**
-   * Determines how much of a fee a key owner would need to pay in order to
-   * transfer the key to another account.  This is pro-rated so the fee goes down
-   * overtime.
-   * @dev Throws if _keyOwner does not have a valid key
-   * @param _keyOwner The owner of the key check the transfer fee for.
-   * @param _time The amount of time to calculate the fee for.
-   * @return The transfer fee in seconds.
-   */
-  function getTransferFee(
-    address _keyOwner,
-    uint _time
-  ) external view returns (uint);
-
-  /**
-   * @dev Invoked by a Lock manager to expire the user's key and perform a refund and cancellation of the key
-   * @param _keyOwner The key owner to whom we wish to send a refund to
-   * @param amount The amount to refund the key-owner
-   * @dev Throws if called by other than a Lock manager
-   * @dev Throws if _keyOwner does not have a valid key
-   */
-  function expireAndRefundFor(address _keyOwner, uint amount) external;
-
-  /**
-   * @dev allows the key manager to expire a given tokenId
-   * and send a refund to the keyOwner based on the amount of time remaining.
-   * @param _tokenId The id of the key to cancel.
-   */
-  function cancelAndRefund(uint _tokenId) external;
-
-  /**
-   * @dev Cancels a key managed by a different user and sends the funds to the keyOwner.
-   * @param _keyManager the key managed by this user will be canceled
-   * @param _v _r _s getCancelAndRefundApprovalHash signed by the _keyManager
-   * @param _tokenId The key to cancel
-   */
-  function cancelAndRefundFor(
-    address _keyManager,
-    uint8 _v,
-    bytes32 _r,
-    bytes32 _s,
-    uint _tokenId
-  ) external;
-
-  /**
-   * @notice Sets the minimum nonce for a valid off-chain approval message from the
-   * senders account.
-   * @dev This can be used to invalidate a previously signed message.
-   */
-  function invalidateOffchainApproval(uint _nextAvailableNonce) external;
-
-  /**
-   * Allow a Lock manager to change the refund penalty.
-   * @dev Throws if called by other than a Lock manager
-   * @param _freeTrialLength The new duration of free trials for this lock
-   * @param _refundPenaltyBasisPoints The new refund penaly in basis-points(bps)
-   */
-  function updateRefundPenalty(
-    uint _freeTrialLength,
-    uint _refundPenaltyBasisPoints
-  ) external;
-
-  /**
-   * @dev Determines how much of a refund a key owner would receive if they issued
-   * @param _keyOwner The key owner to get the refund value for.
-   * a cancelAndRefund block.timestamp.
-   * Note that due to the time required to mine a tx, the actual refund amount will be lower
-   * than what the user reads from this call.
-   */
-  function getCancelAndRefundValueFor(
-    address _keyOwner
-  ) external view returns (uint refund);
-
-  function keyManagerToNonce(address) external view returns (uint256);
-
-  /**
-   * @notice returns the hash to sign in order to allow another user to cancel on your behalf.
-   * @dev this can be computed in JS instead of read from the contract.
-   * @param _keyManager The key manager's address (also the message signer)
-   * @param _txSender The address cancelling cancel on behalf of the keyOwner
-   * @return approvalHash The hash to sign
-   */
-  function getCancelAndRefundApprovalHash(
-    address _keyManager,
-    address _txSender
-  ) external view returns (bytes32 approvalHash);
-
-  function addKeyGranter(address account) external;
-
-  function addLockManager(address account) external;
-
-  function isKeyGranter(address account) external view returns (bool);
-
-  function isLockManager(address account) external view returns (bool);
-
-  function onKeyPurchaseHook() external view returns (address);
-
-  function onKeyCancelHook() external view returns (address);
-
-  function revokeKeyGranter(address _granter) external;
-
-  function renounceLockManager() external;
-
-  ///===================================================================
-  /// Auto-generated getter functions from public state variables
-
-  function beneficiary() external view returns (address);
-
-  function expirationDuration() external view returns (uint256);
-
-  function freeTrialLength() external view returns (uint256);
-
-  function isAlive() external view returns (bool);
-
-  function keyPrice() external view returns (uint256);
-
-  function maxNumberOfKeys() external view returns (uint256);
-
-  function owners(uint256) external view returns (address);
-
-  function refundPenaltyBasisPoints() external view returns (uint256);
-
-  function tokenAddress() external view returns (address);
-
-  function transferFeeBasisPoints() external view returns (uint256);
-
-  function unlockProtocol() external view returns (address);
-
-  function keyManagerOf(uint) external view returns (address);
-
-  ///===================================================================
-
-  /**
-   * @notice Allows the key owner to safely share their key (parent key) by
-   * transferring a portion of the remaining time to a new key (child key).
-   * @dev Throws if key is not valid.
-   * @dev Throws if `_to` is the zero address
-   * @param _to The recipient of the shared key
-   * @param _tokenId the key to share
-   * @param _timeShared The amount of time shared
-   * checks if `_to` is a smart contract (code size > 0). If so, it calls
-   * `onERC721Received` on `_to` and throws if the return value is not
-   * `bytes4(keccak256('onERC721Received(address,address,uint,bytes)'))`.
-   * @dev Emit Transfer event
-   */
-  function shareKey(address _to, uint _tokenId, uint _timeShared) external;
-
-  /**
-   * @notice Update transfer and cancel rights for a given key
-   * @param _tokenId The id of the key to assign rights for
-   * @param _keyManager The address to assign the rights to for the given key
-   */
-  function setKeyManagerOf(uint _tokenId, address _keyManager) external;
-
-  /// @notice A descriptive name for a collection of NFTs in this contract
-  function name() external view returns (string memory _name);
-
-  ///===================================================================
-
-  /// From ERC165.sol
-  function supportsInterface(bytes4 interfaceId) external view returns (bool);
-
-  ///===================================================================
-
-  /// From ERC-721
-  /**
-   * @dev Returns the number of NFTs in `owner`'s account.
-   */
-  function balanceOf(address _owner) public view returns (uint256 balance);
-
-  /**
-   * @dev Returns the owner of the NFT specified by `tokenId`.
-   */
-  function ownerOf(uint256 tokenId) public view returns (address _owner);
-
-  /**
-   * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
-   * another (`to`).
-   *
-   *
-   *
-   * Requirements:
-   * - `from`, `to` cannot be zero.
-   * - `tokenId` must be owned by `from`.
-   * - If the caller is not `from`, it must be have been allowed to move this
-   * NFT by either `approve` or `setApprovalForAll`.
-   */
-  function safeTransferFrom(address from, address to, uint256 tokenId) public;
-
-  /**
-   * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
-   * another (`to`).
-   *
-   * Requirements:
-   * - If the caller is not `from`, it must be approved to move this NFT by
-   * either `approve` or `setApprovalForAll`.
-   */
-  function transferFrom(address from, address to, uint256 tokenId) public;
-
-  function approve(address to, uint256 tokenId) public;
-
-  /**
-   * @notice Get the approved address for a single NFT
-   * @dev Throws if `_tokenId` is not a valid NFT.
-   * @param _tokenId The NFT to find the approved address for
-   * @return The approved address for this NFT, or the zero address if there is none
-   */
-  function getApproved(uint256 _tokenId) public view returns (address operator);
-
-  function setApprovalForAll(address operator, bool _approved) public;
-
-  function isApprovedForAll(
-    address _owner,
-    address operator
-  ) public view returns (bool);
-
-  function safeTransferFrom(
-    address from,
-    address to,
-    uint256 tokenId,
-    bytes memory data
-  ) public;
-
-  function totalSupply() public view returns (uint256);
-
-  function tokenOfOwnerByIndex(
-    address _owner,
-    uint256 index
-  ) public view returns (uint256 tokenId);
-
-  function tokenByIndex(uint256 index) public view returns (uint256);
-}
-
-// File contracts/interfaces/IUnlock.sol
-
-pragma solidity 0.5.17;
-
-/**
- * @title The Unlock Interface
- **/
-
-interface IUnlock {
-  // Use initialize instead of a constructor to support proxies(for upgradeability via zos).
-  function initialize(address _unlockOwner) external;
-
-  /**
-   * @dev Create lock
-   * This deploys a lock for a creator. It also keeps track of the deployed lock.
-   * @param _tokenAddress set to the ERC20 token address, or 0 for ETH.
-   * @param _salt an identifier for the Lock, which is unique for the user.
-   * This may be implemented as a sequence ID or with RNG. It's used with `create2`
-   * to know the lock's address before the transaction is mined.
-   */
-  function createLock(
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys,
-    string calldata _lockName,
-    bytes12 _salt
-  ) external;
-
-  /**
-   * This function keeps track of the added GDP, as well as grants of discount tokens
-   * to the referrer, if applicable.
-   * The number of discount tokens granted is based on the value of the referal,
-   * the current growth rate and the lock's discount token distribution rate
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordKeyPurchase(
-    uint _value,
-    address _referrer // solhint-disable-line no-unused-vars
-  ) external;
-
-  /**
-   * This function will keep track of consumed discounts by a given user.
-   * It will also grant discount tokens to the creator who is granting the discount based on the
-   * amount of discount and compensation rate.
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordConsumedDiscount(
-    uint _discount,
-    uint _tokens // solhint-disable-line no-unused-vars
-  ) external;
-
-  /**
-   * This function returns the discount available for a user, when purchasing a
-   * a key from a lock.
-   * This does not modify the state. It returns both the discount and the number of tokens
-   * consumed to grant that discount.
-   */
-  function computeAvailableDiscountFor(
-    address _purchaser, // solhint-disable-line no-unused-vars
-    uint _keyPrice // solhint-disable-line no-unused-vars
-  ) external view returns (uint discount, uint tokens);
-
-  // Function to read the globalTokenURI field.
-  function globalBaseTokenURI() external view returns (string memory);
-
-  /**
-   * @dev Redundant with globalBaseTokenURI() for backwards compatibility with v3 & v4 locks.
-   */
-  function getGlobalBaseTokenURI() external view returns (string memory);
-
-  // Function to read the globalTokenSymbol field.
-  function globalTokenSymbol() external view returns (string memory);
-
-  /**
-   * @dev Redundant with globalTokenSymbol() for backwards compatibility with v3 & v4 locks.
-   */
-  function getGlobalTokenSymbol() external view returns (string memory);
-
-  /** Function for the owner to update configuration variables.
-   *  Should throw if called by other than owner.
-   */
-  function configUnlock(string calldata _symbol, string calldata _URI) external;
-
-  /**
-   * @notice Upgrade the PublicLock template used for future calls to `createLock`.
-   * @dev This will initialize the template and revokeOwnership.
-   */
-  function setLockTemplate(address payable _publicLockAddress) external;
-
-  // Allows the owner to change the value tracking variables as needed.
-  function resetTrackedValue(
-    uint _grossNetworkProduct,
-    uint _totalDiscountGranted
-  ) external;
-
-  function grossNetworkProduct() external view returns (uint);
-
-  function totalDiscountGranted() external view returns (uint);
-
-  function locks(
-    address
-  )
-    external
-    view
-    returns (bool deployed, uint totalSales, uint yieldedDiscountTokens);
-
-  // The address of the public lock template, used when `createLock` is called
-  function publicLockAddress() external view returns (address);
-
-  // Map token address to exchange contract address if the token is supported
-  // Used for GDP calculations
-  function uniswapExchanges(address) external view returns (address);
-
-  // The version number of the current Unlock implementation on this network
-  function unlockVersion() external pure returns (uint16);
-
-  // allows the owner to set the exchange address to use for value conversions
-  // setting the _exchangeAddress to address(0) removes support for the token
-  function setExchange(
-    address _tokenAddress,
-    address _exchangeAddress
-  ) external;
-
-  /**
-   * @dev Returns true if the caller is the current owner.
-   */
-  function isOwner() external view returns (bool);
-
-  /**
-   * @dev Returns the address of the current owner.
-   */
-  function owner() external view returns (address);
-
-  /**
-   * @dev Leaves the contract without owner. It will not be possible to call
-   * `onlyOwner` functions anymore. Can only be called by the current owner.
-   *
-   * NOTE: Renouncing ownership will leave the contract without an owner,
-   * thereby removing any functionality that is only available to the owner.
-   */
-  function renounceOwnership() external;
-
-  /**
-   * @dev Transfers ownership of the contract to a new account (`newOwner`).
-   * Can only be called by the current owner.
-   */
-  function transferOwnership(address newOwner) external;
-}
-
-// File @openzeppelin/contracts-ethereum-package/contracts/utils/Address.sol@v2.4.0
-
-pragma solidity ^0.5.5;
-
-/**
- * @dev Collection of functions related to the address type
- */
-library Address {
-  /**
-   * @dev Returns true if `account` is a contract.
-   *
-   * This test is non-exhaustive, and there may be false-negatives: during the
-   * execution of a contract's constructor, its address will be reported as
-   * not containing a contract.
-   *
-   * IMPORTANT: It is unsafe to assume that an address for which this
-   * function returns false is an externally-owned account (EOA) and not a
-   * contract.
-   */
-  function isContract(address account) internal view returns (bool) {
-    // This method relies in extcodesize, which returns 0 for contracts in
-    // construction, since the code is only stored at the end of the
-    // constructor execution.
-
-    // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
-    // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
-    // for accounts without code, i.e. `keccak256('')`
-    bytes32 codehash;
-    bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
-    // solhint-disable-next-line no-inline-assembly
-    assembly {
-      codehash := extcodehash(account)
-    }
-    return (codehash != 0x0 && codehash != accountHash);
-  }
-
-  /**
-   * @dev Converts an `address` into `address payable`. Note that this is
-   * simply a type cast: the actual underlying value is not changed.
-   *
-   * _Available since v2.4.0._
-   */
-  function toPayable(address account) internal pure returns (address payable) {
-    return address(uint160(account));
-  }
-
-  /**
-   * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
-   * `recipient`, forwarding all available gas and reverting on errors.
-   *
-   * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
-   * of certain opcodes, possibly making contracts go over the 2300 gas limit
-   * imposed by `transfer`, making them unable to receive funds via
-   * `transfer`. {sendValue} removes this limitation.
-   *
-   * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
-   *
-   * IMPORTANT: because control is transferred to `recipient`, care must be
-   * taken to not create reentrancy vulnerabilities. Consider using
-   * {ReentrancyGuard} or the
-   * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
-   *
-   * _Available since v2.4.0._
-   */
-  function sendValue(address payable recipient, uint256 amount) internal {
-    require(address(this).balance >= amount, "Address: insufficient balance");
-
-    // solhint-disable-next-line avoid-call-value
-    (bool success, ) = recipient.call.value(amount)("");
-    require(
-      success,
-      "Address: unable to send value, recipient may have reverted"
-    );
-  }
-}
-
-// File contracts/Unlock.sol
-
-pragma solidity 0.5.17;
-
-/**
- * @title The Unlock contract
- * @author Julien Genestoux (unlock-protocol.com)
- * This smart contract has 3 main roles:
- *  1. Distribute discounts to discount token holders
- *  2. Grant dicount tokens to users making referrals and/or publishers granting discounts.
- *  3. Create & deploy Public Lock contracts.
- * In order to achieve these 3 elements, it keeps track of several things such as
- *  a. Deployed locks addresses and balances of discount tokens granted by each lock.
- *  b. The total network product (sum of all key sales, net of discounts)
- *  c. Total of discounts granted
- *  d. Balances of discount tokens, including 'frozen' tokens (which have been used to claim
- * discounts and cannot be used/transferred for a given period)
- *  e. Growth rate of Network Product
- *  f. Growth rate of Discount tokens supply
- * The smart contract has an owner who only can perform the following
- *  - Upgrades
- *  - Change in golden rules (20% of GDP available in discounts, and supply growth rate is at most
- * 50% of GNP growth rate)
- * NOTE: This smart contract is partially implemented for now until enough Locks are deployed and
- * in the wild.
- * The partial implementation includes the following features:
- *  a. Keeping track of deployed locks
- *  b. Keeping track of GNP
- */
-
-/// @dev Must list the direct base contracts in the order from “most base-like” to “most derived”.
-/// https://solidity.readthedocs.io/en/latest/contracts.html#multiple-inheritance-and-linearization
-contract Unlock is IUnlock, Initializable, Ownable {
-  using Address for address;
-  using Clone2Factory for address;
-
-  /**
-   * The struct for a lock
-   * We use deployed to keep track of deployments.
-   * This is required because both totalSales and yieldedDiscountTokens are 0 when initialized,
-   * which would be the same values when the lock is not set.
-   */
-  struct LockBalances {
-    bool deployed;
-    uint totalSales; // This is in wei
-    uint yieldedDiscountTokens;
-  }
-
-  modifier onlyFromDeployedLock() {
-    require(locks[msg.sender].deployed, "ONLY_LOCKS");
-    _;
-  }
-
-  uint public grossNetworkProduct;
-
-  uint public totalDiscountGranted;
-
-  // We keep track of deployed locks to ensure that callers are all deployed locks.
-  mapping(address => LockBalances) public locks;
-
-  // global base token URI
-  // Used by locks where the owner has not set a custom base URI.
-  string public globalBaseTokenURI;
-
-  // global base token symbol
-  // Used by locks where the owner has not set a custom symbol
-  string public globalTokenSymbol;
-
-  // The address of the public lock template, used when `createLock` is called
-  address public publicLockAddress;
-
-  // Map token address to exchange contract address if the token is supported
-  // Used for GDP calculations
-  mapping(address => IUniswapExchange) public uniswapExchanges;
-
-  // Events
-  event NewLock(address indexed lockOwner, address indexed newLockAddress);
-
-  event ConfigUnlock(string globalTokenSymbol, string globalTokenURI);
-
-  event SetLockTemplate(address publicLockAddress);
-
-  event ResetTrackedValue(uint grossNetworkProduct, uint totalDiscountGranted);
-
-  // Use initialize instead of a constructor to support proxies (for upgradeability via zos).
-  function initialize(address _unlockOwner) public initializer {
-    // We must manually initialize Ownable.sol
-    Ownable.initialize(_unlockOwner);
-  }
-
-  /**
-   * @dev Create lock
-   * This deploys a lock for a creator. It also keeps track of the deployed lock.
-   * @param _tokenAddress set to the ERC20 token address, or 0 for ETH.
-   * @param _salt an identifier for the Lock, which is unique for the user.
-   * This may be implemented as a sequence ID or with RNG. It's used with `create2`
-   * to know the lock's address before the transaction is mined.
-   */
-  function createLock(
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys,
-    string memory _lockName,
-    bytes12 _salt
-  ) public {
-    require(publicLockAddress != address(0), "MISSING_LOCK_TEMPLATE");
-
-    // create lock
-    address payable newLock = address(
-      uint160(publicLockAddress._createClone2(_salt))
-    );
-    IPublicLock(newLock).initialize(
-      msg.sender,
-      _expirationDuration,
-      _tokenAddress,
-      _keyPrice,
-      _maxNumberOfKeys,
-      _lockName
-    );
-
-    // Assign the new Lock
-    locks[newLock] = LockBalances({
-      deployed: true,
-      totalSales: 0,
-      yieldedDiscountTokens: 0
-    });
-
-    // trigger event
-    emit NewLock(msg.sender, newLock);
-  }
-
-  /**
-   * This function returns the discount available for a user, when purchasing a
-   * a key from a lock.
-   * This does not modify the state. It returns both the discount and the number of tokens
-   * consumed to grant that discount.
-   * TODO: actually implement this.
-   */
-  function computeAvailableDiscountFor(
-    address /* _purchaser */,
-    uint /* _keyPrice */
-  ) public view returns (uint discount, uint tokens) {
-    // TODO: implement me
-    return (0, 0);
-  }
-
-  /**
-   * This function keeps track of the added GDP, as well as grants of discount tokens
-   * to the referrer, if applicable.
-   * The number of discount tokens granted is based on the value of the referal,
-   * the current growth rate and the lock's discount token distribution rate
-   * This function is invoked by a previously deployed lock only.
-   * TODO: actually implement
-   */
-  function recordKeyPurchase(
-    uint _value,
-    address /* _referrer */
-  ) public onlyFromDeployedLock {
-    if (_value > 0) {
-      uint valueInETH;
-      address tokenAddress = IPublicLock(msg.sender).tokenAddress();
-      if (tokenAddress != address(0)) {
-        // If priced in an ERC-20 token, find the supported uniswap exchange
-        IUniswapExchange exchange = uniswapExchanges[tokenAddress];
-        if (address(exchange) != address(0)) {
-          valueInETH = exchange.getTokenToEthInputPrice(_value);
-        } else {
-          // If the token type is not supported, assume 0 value
-          valueInETH = 0;
-        }
-      } else {
-        // If priced in ETH (or value is 0), no conversion is required
-        valueInETH = _value;
-      }
-
-      grossNetworkProduct += valueInETH;
-      locks[msg.sender].totalSales += valueInETH;
-    }
-  }
-
-  /**
-   * This function will keep track of consumed discounts by a given user.
-   * It will also grant discount tokens to the creator who is granting the discount based on the
-   * amount of discount and compensation rate.
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordConsumedDiscount(
-    uint _discount,
-    uint /* _tokens */
-  ) public onlyFromDeployedLock {
-    // TODO: implement me
-    totalDiscountGranted += _discount;
-    return;
-  }
-
-  // The version number of the current Unlock implementation on this network
-  function unlockVersion() external pure returns (uint16) {
-    return 7;
-  }
-
-  // function for the owner to update configuration variables
-  function configUnlock(
-    string calldata _symbol,
-    string calldata _URI
-  ) external onlyOwner {
-    // ensure that this is an address to which a contract has been deployed.
-    globalTokenSymbol = _symbol;
-    globalBaseTokenURI = _URI;
-
-    emit ConfigUnlock(_symbol, _URI);
-  }
-
-  /**
-   * @notice Upgrade the PublicLock template used for future calls to `createLock`.
-   * @dev This will initialize the template and revokeOwnership.
-   */
-  function setLockTemplate(
-    address payable _publicLockAddress
-  ) external onlyOwner {
-    // First claim the template so that no-one else could
-    // this will revert if the template was already initialized.
-    IPublicLock(_publicLockAddress).initialize(
-      address(this),
-      0,
-      address(0),
-      0,
-      0,
-      ""
-    );
-    IPublicLock(_publicLockAddress).renounceLockManager();
-
-    publicLockAddress = _publicLockAddress;
-
-    emit SetLockTemplate(_publicLockAddress);
-  }
-
-  // allows the owner to set the exchange address to use for value conversions
-  // setting the _exchangeAddress to address(0) removes support for the token
-  function setExchange(
-    address _tokenAddress,
-    address _exchangeAddress
-  ) external onlyOwner {
-    uniswapExchanges[_tokenAddress] = IUniswapExchange(_exchangeAddress);
-  }
-
-  // Allows the owner to change the value tracking variables as needed.
-  function resetTrackedValue(
-    uint _grossNetworkProduct,
-    uint _totalDiscountGranted
-  ) external onlyOwner {
-    grossNetworkProduct = _grossNetworkProduct;
-    totalDiscountGranted = _totalDiscountGranted;
-
-    emit ResetTrackedValue(_grossNetworkProduct, _totalDiscountGranted);
-  }
-
-  /**
-   * @dev Redundant with globalBaseTokenURI() for backwards compatibility with v3 & v4 locks.
-   */
-  function getGlobalBaseTokenURI() external view returns (string memory) {
-    return globalBaseTokenURI;
-  }
-
-  /**
-   * @dev Redundant with globalTokenSymbol() for backwards compatibility with v3 & v4 locks.
-   */
-  function getGlobalTokenSymbol() external view returns (string memory) {
-    return globalTokenSymbol;
-  }
-}
diff --git a/packages/contracts/src/contracts/Unlock/UnlockV8.sol b/packages/contracts/src/contracts/Unlock/UnlockV8.sol
deleted file mode 100644
index 44771ea8a1d..00000000000
--- a/packages/contracts/src/contracts/Unlock/UnlockV8.sol
+++ /dev/null
@@ -1,1540 +0,0 @@
-// Sources flattened with hardhat v2.4.1 https://hardhat.org
-
-// File @openzeppelin/upgrades/contracts/Initializable.sol@v2.8.0
-
-pragma solidity >=0.4.24 <0.7.0;
-
-/**
- * @title Initializable
- *
- * @dev Helper contract to support initializer functions. To use it, replace
- * the constructor with a function that has the `initializer` modifier.
- * WARNING: Unlike constructors, initializer functions must be manually
- * invoked. This applies both to deploying an Initializable contract, as well
- * as extending an Initializable contract via inheritance.
- * WARNING: When used with inheritance, manual care must be taken to not invoke
- * a parent initializer twice, or ensure that all initializers are idempotent,
- * because this is not dealt with automatically as with constructors.
- */
-contract Initializable {
-  /**
-   * @dev Indicates that the contract has been initialized.
-   */
-  bool private initialized;
-
-  /**
-   * @dev Indicates that the contract is in the process of being initialized.
-   */
-  bool private initializing;
-
-  /**
-   * @dev Modifier to use in the initializer function of a contract.
-   */
-  modifier initializer() {
-    require(
-      initializing || isConstructor() || !initialized,
-      "Contract instance has already been initialized"
-    );
-
-    bool isTopLevelCall = !initializing;
-    if (isTopLevelCall) {
-      initializing = true;
-      initialized = true;
-    }
-
-    _;
-
-    if (isTopLevelCall) {
-      initializing = false;
-    }
-  }
-
-  /// @dev Returns true if and only if the function is running in the constructor
-  function isConstructor() private view returns (bool) {
-    // extcodesize checks the size of the code stored in an address, and
-    // address returns the current address. Since the code is still not
-    // deployed when running a constructor, any checks on its code size will
-    // yield zero, making it an effective way to detect if a contract is
-    // under construction or not.
-    address self = address(this);
-    uint256 cs;
-    assembly {
-      cs := extcodesize(self)
-    }
-    return cs == 0;
-  }
-
-  // Reserved storage space to allow for layout changes in the future.
-  uint256[50] private ______gap;
-}
-
-// File @openzeppelin/contracts-ethereum-package/contracts/GSN/Context.sol@v2.5.0
-
-pragma solidity ^0.5.0;
-
-/*
- * @dev Provides information about the current execution context, including the
- * sender of the transaction and its data. While these are generally available
- * via msg.sender and msg.data, they should not be accessed in such a direct
- * manner, since when dealing with GSN meta-transactions the account sending and
- * paying for execution may not be the actual sender (as far as an application
- * is concerned).
- *
- * This contract is only required for intermediate, library-like contracts.
- */
-contract Context is Initializable {
-  // Empty internal constructor, to prevent people from mistakenly deploying
-  // an instance of this contract, which should be used via inheritance.
-  constructor() internal {}
-
-  // solhint-disable-previous-line no-empty-blocks
-
-  function _msgSender() internal view returns (address payable) {
-    return msg.sender;
-  }
-
-  function _msgData() internal view returns (bytes memory) {
-    this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
-    return msg.data;
-  }
-}
-
-// File @openzeppelin/contracts-ethereum-package/contracts/ownership/Ownable.sol@v2.5.0
-
-pragma solidity ^0.5.0;
-
-/**
- * @dev Contract module which provides a basic access control mechanism, where
- * there is an account (an owner) that can be granted exclusive access to
- * specific functions.
- *
- * This module is used through inheritance. It will make available the modifier
- * `onlyOwner`, which can be aplied to your functions to restrict their use to
- * the owner.
- */
-contract Ownable is Initializable, Context {
-  address private _owner;
-
-  event OwnershipTransferred(
-    address indexed previousOwner,
-    address indexed newOwner
-  );
-
-  /**
-   * @dev Initializes the contract setting the deployer as the initial owner.
-   */
-  function initialize(address sender) public initializer {
-    _owner = sender;
-    emit OwnershipTransferred(address(0), _owner);
-  }
-
-  /**
-   * @dev Returns the address of the current owner.
-   */
-  function owner() public view returns (address) {
-    return _owner;
-  }
-
-  /**
-   * @dev Throws if called by any account other than the owner.
-   */
-  modifier onlyOwner() {
-    require(isOwner(), "Ownable: caller is not the owner");
-    _;
-  }
-
-  /**
-   * @dev Returns true if the caller is the current owner.
-   */
-  function isOwner() public view returns (bool) {
-    return _msgSender() == _owner;
-  }
-
-  /**
-   * @dev Leaves the contract without owner. It will not be possible to call
-   * `onlyOwner` functions anymore. Can only be called by the current owner.
-   *
-   * > Note: Renouncing ownership will leave the contract without an owner,
-   * thereby removing any functionality that is only available to the owner.
-   */
-  function renounceOwnership() public onlyOwner {
-    emit OwnershipTransferred(_owner, address(0));
-    _owner = address(0);
-  }
-
-  /**
-   * @dev Transfers ownership of the contract to a new account (`newOwner`).
-   * Can only be called by the current owner.
-   */
-  function transferOwnership(address newOwner) public onlyOwner {
-    _transferOwnership(newOwner);
-  }
-
-  /**
-   * @dev Transfers ownership of the contract to a new account (`newOwner`).
-   */
-  function _transferOwnership(address newOwner) internal {
-    require(newOwner != address(0), "Ownable: new owner is the zero address");
-    emit OwnershipTransferred(_owner, newOwner);
-    _owner = newOwner;
-  }
-
-  uint256[50] private ______gap;
-}
-
-// File hardlydifficult-ethereum-contracts/contracts/proxies/Clone2Factory.sol@v0.11.1
-
-pragma solidity ^0.5.0;
-
-// From https://github.com/optionality/clone-factory/blob/master/contracts/CloneFactory.sol
-// Updated to support Solidity 5, switch to `create2` and revert on fail
-library Clone2Factory {
-  /**
-   * @notice Uses create2 to deploy a clone to a pre-determined address.
-   * @param target the address of the template contract, containing the logic for this contract.
-   * @param salt a salt used to determine the contract address before the transaction is mined,
-   * may be random or sequential.
-   * The salt to use with the create2 call can be `msg.sender+salt` in order to
-   * prevent an attacker from front-running another user's deployment.
-   * @return proxyAddress the address of the newly deployed contract.
-   * @dev Using `bytes12` for the salt saves 6 gas over using `uint96` (requires another shift).
-   * Will revert on fail.
-   */
-  function createClone2(
-    address target,
-    bytes32 salt
-  ) internal returns (address proxyAddress) {
-    // solium-disable-next-line
-    assembly {
-      let pointer := mload(0x40)
-
-      // Create the bytecode for deployment based on the Minimal Proxy Standard (EIP-1167)
-      // bytecode: 0x0
-      mstore(
-        pointer,
-        0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000
-      )
-      mstore(add(pointer, 0x14), shl(96, target))
-      mstore(
-        add(pointer, 0x28),
-        0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000
-      )
-
-      // `create2` consumes all available gas if called with a salt that's already been consumed
-      // we check if the address is available first so that doesn't happen
-      // Costs ~958 gas
-
-      // Calculate the hash
-      let contractCodeHash := keccak256(pointer, 0x37)
-
-      // salt: 0x100
-      mstore(add(pointer, 0x100), salt)
-
-      // addressSeed: 0x40
-      // 0xff
-      mstore(
-        add(pointer, 0x40),
-        0xff00000000000000000000000000000000000000000000000000000000000000
-      )
-      // this
-      mstore(add(pointer, 0x41), shl(96, address))
-      // salt
-      mstore(add(pointer, 0x55), mload(add(pointer, 0x100)))
-      // hash
-      mstore(add(pointer, 0x75), contractCodeHash)
-
-      proxyAddress := keccak256(add(pointer, 0x40), 0x55)
-
-      switch extcodesize(proxyAddress)
-      case 0 {
-        // Deploy the contract, returning the address or 0 on fail
-        proxyAddress := create2(0, pointer, 0x37, mload(add(pointer, 0x100)))
-      }
-      default {
-        proxyAddress := 0
-      }
-    }
-
-    // Revert if the deployment fails (possible if salt was already used)
-    require(proxyAddress != address(0), "PROXY_DEPLOY_FAILED");
-  }
-}
-
-// File contracts/interfaces/IPublicLock.sol
-
-pragma solidity 0.5.17;
-
-/**
- * @title The PublicLock Interface
- */
-
-contract IPublicLock {
-  // See indentationissue description here:
-  // https://github.com/duaraghav8/Ethlint/issues/268
-  // solium-disable indentation
-
-  /// Functions
-
-  function initialize(
-    address _lockCreator,
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys,
-    string calldata _lockName
-  ) external;
-
-  /**
-   * @notice Allow the contract to accept tips in ETH sent directly to the contract.
-   * @dev This is okay to use even if the lock is priced in ERC-20 tokens
-   */
-  function() external payable;
-
-  /**
-   * @dev Never used directly
-   */
-  function initialize() external;
-
-  /**
-   * @notice The version number of the current implementation on this network.
-   * @return The current version number.
-   */
-  function publicLockVersion() public pure returns (uint);
-
-  /**
-   * @notice Gets the current balance of the account provided.
-   * @param _tokenAddress The token type to retrieve the balance of.
-   * @param _account The account to get the balance of.
-   * @return The number of tokens of the given type for the given address, possibly 0.
-   */
-  function getBalance(
-    address _tokenAddress,
-    address _account
-  ) external view returns (uint);
-
-  /**
-   * @notice Used to disable lock before migrating keys and/or destroying contract.
-   * @dev Throws if called by other than a lock manager.
-   * @dev Throws if lock contract has already been disabled.
-   */
-  function disableLock() external;
-
-  /**
-   * @dev Called by a lock manager or beneficiary to withdraw all funds from the lock and send them to the `beneficiary`.
-   * @dev Throws if called by other than a lock manager or beneficiary
-   * @param _tokenAddress specifies the token address to withdraw or 0 for ETH. This is usually
-   * the same as `tokenAddress` in MixinFunds.
-   * @param _amount specifies the max amount to withdraw, which may be reduced when
-   * considering the available balance. Set to 0 or MAX_UINT to withdraw everything.
-   *  -- however be wary of draining funds as it breaks the `cancelAndRefund` and `expireAndRefundFor`
-   * use cases.
-   */
-  function withdraw(address _tokenAddress, uint _amount) external;
-
-  /**
-   * @notice An ERC-20 style approval, allowing the spender to transfer funds directly from this lock.
-   * @param _spender address that can spend tokens belonging to the lock
-   * @param _amount amount of tokens that can be spent by the spender
-   */
-  function approveBeneficiary(
-    address _spender,
-    uint _amount
-  ) external returns (bool);
-
-  /**
-   * A function which lets a Lock manager of the lock to change the price for future purchases.
-   * @dev Throws if called by other than a Lock manager
-   * @dev Throws if lock has been disabled
-   * @dev Throws if _tokenAddress is not a valid token
-   * @param _keyPrice The new price to set for keys
-   * @param _tokenAddress The address of the erc20 token to use for pricing the keys,
-   * or 0 to use ETH
-   */
-  function updateKeyPricing(uint _keyPrice, address _tokenAddress) external;
-
-  /**
-   * A function which lets a Lock manager update the beneficiary account,
-   * which receives funds on withdrawal.
-   * @dev Throws if called by other than a Lock manager or beneficiary
-   * @dev Throws if _beneficiary is address(0)
-   * @param _beneficiary The new address to set as the beneficiary
-   */
-  function updateBeneficiary(address _beneficiary) external;
-
-  /**
-   * Checks if the user has a non-expired key.
-   * @param _user The address of the key owner
-   */
-  function getHasValidKey(address _user) external view returns (bool);
-
-  /**
-   * @notice Find the tokenId for a given user
-   * @return The tokenId of the NFT, else returns 0
-   * @param _account The address of the key owner
-   */
-  function getTokenIdFor(address _account) external view returns (uint);
-
-  /**
-   * A function which returns a subset of the keys for this Lock as an array
-   * @param _page the page of key owners requested when faceted by page size
-   * @param _pageSize the number of Key Owners requested per page
-   * @dev Throws if there are no key owners yet
-   */
-  function getOwnersByPage(
-    uint _page,
-    uint _pageSize
-  ) external view returns (address[] memory);
-
-  /**
-   * Checks if the given address owns the given tokenId.
-   * @param _tokenId The tokenId of the key to check
-   * @param _keyOwner The potential key owners address
-   */
-  function isKeyOwner(
-    uint _tokenId,
-    address _keyOwner
-  ) external view returns (bool);
-
-  /**
-   * @dev Returns the key's ExpirationTimestamp field for a given owner.
-   * @param _keyOwner address of the user for whom we search the key
-   * @dev Returns 0 if the owner has never owned a key for this lock
-   */
-  function keyExpirationTimestampFor(
-    address _keyOwner
-  ) external view returns (uint timestamp);
-
-  /**
-   * Public function which returns the total number of unique owners (both expired
-   * and valid).  This may be larger than totalSupply.
-   */
-  function numberOfOwners() external view returns (uint);
-
-  /**
-   * Allows a Lock manager to assign a descriptive name for this Lock.
-   * @param _lockName The new name for the lock
-   * @dev Throws if called by other than a Lock manager
-   */
-  function updateLockName(string calldata _lockName) external;
-
-  /**
-   * Allows a Lock manager to assign a Symbol for this Lock.
-   * @param _lockSymbol The new Symbol for the lock
-   * @dev Throws if called by other than a Lock manager
-   */
-  function updateLockSymbol(string calldata _lockSymbol) external;
-
-  /**
-   * @dev Gets the token symbol
-   * @return string representing the token symbol
-   */
-  function symbol() external view returns (string memory);
-
-  /**
-   * Allows a Lock manager to update the baseTokenURI for this Lock.
-   * @dev Throws if called by other than a Lock manager
-   * @param _baseTokenURI String representing the base of the URI for this lock.
-   */
-  function setBaseTokenURI(string calldata _baseTokenURI) external;
-
-  /**  @notice A distinct Uniform Resource Identifier (URI) for a given asset.
-   * @dev Throws if `_tokenId` is not a valid NFT. URIs are defined in RFC
-   *  3986. The URI may point to a JSON file that conforms to the "ERC721
-   *  Metadata JSON Schema".
-   * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
-   * @param _tokenId The tokenID we're inquiring about
-   * @return String representing the URI for the requested token
-   */
-  function tokenURI(uint256 _tokenId) external view returns (string memory);
-
-  /**
-   * Allows a Lock manager to add or remove an event hook
-   * @param _onKeyPurchaseHook Hook called when the `purchase` function is called
-   * @param _onKeyCancelHook Hook called when the internal `_cancelAndRefund` function is called
-   */
-  function setEventHooks(
-    address _onKeyPurchaseHook,
-    address _onKeyCancelHook
-  ) external;
-
-  /**
-   * Allows a Lock manager to give a collection of users a key with no charge.
-   * Each key may be assigned a different expiration date.
-   * @dev Throws if called by other than a Lock manager
-   * @param _recipients An array of receiving addresses
-   * @param _expirationTimestamps An array of expiration Timestamps for the keys being granted
-   */
-  function grantKeys(
-    address[] calldata _recipients,
-    uint[] calldata _expirationTimestamps,
-    address[] calldata _keyManagers
-  ) external;
-
-  /**
-   * @dev Purchase function
-   * @param _value the number of tokens to pay for this purchase >= the current keyPrice - any applicable discount
-   * (_value is ignored when using ETH)
-   * @param _recipient address of the recipient of the purchased key
-   * @param _referrer address of the user making the referral
-   * @param _data arbitrary data populated by the front-end which initiated the sale
-   * @dev Throws if lock is disabled. Throws if lock is sold-out. Throws if _recipient == address(0).
-   * @dev Setting _value to keyPrice exactly doubles as a security feature. That way if a Lock manager increases the
-   * price while my transaction is pending I can't be charged more than I expected (only applicable to ERC-20 when more
-   * than keyPrice is approved for spending).
-   */
-  function purchase(
-    uint256 _value,
-    address _recipient,
-    address _referrer,
-    bytes calldata _data
-  ) external payable;
-
-  /**
-   * @notice returns the minimum price paid for a purchase with these params.
-   * @dev this considers any discount from Unlock or the OnKeyPurchase hook.
-   */
-  function purchasePriceFor(
-    address _recipient,
-    address _referrer,
-    bytes calldata _data
-  ) external view returns (uint);
-
-  /**
-   * Allow a Lock manager to change the transfer fee.
-   * @dev Throws if called by other than a Lock manager
-   * @param _transferFeeBasisPoints The new transfer fee in basis-points(bps).
-   * Ex: 200 bps = 2%
-   */
-  function updateTransferFee(uint _transferFeeBasisPoints) external;
-
-  /**
-   * Determines how much of a fee a key owner would need to pay in order to
-   * transfer the key to another account.  This is pro-rated so the fee goes down
-   * overtime.
-   * @dev Throws if _keyOwner does not have a valid key
-   * @param _keyOwner The owner of the key check the transfer fee for.
-   * @param _time The amount of time to calculate the fee for.
-   * @return The transfer fee in seconds.
-   */
-  function getTransferFee(
-    address _keyOwner,
-    uint _time
-  ) external view returns (uint);
-
-  /**
-   * @dev Invoked by a Lock manager to expire the user's key and perform a refund and cancellation of the key
-   * @param _keyOwner The key owner to whom we wish to send a refund to
-   * @param amount The amount to refund the key-owner
-   * @dev Throws if called by other than a Lock manager
-   * @dev Throws if _keyOwner does not have a valid key
-   */
-  function expireAndRefundFor(address _keyOwner, uint amount) external;
-
-  /**
-   * @dev allows the key manager to expire a given tokenId
-   * and send a refund to the keyOwner based on the amount of time remaining.
-   * @param _tokenId The id of the key to cancel.
-   */
-  function cancelAndRefund(uint _tokenId) external;
-
-  /**
-   * @dev Cancels a key managed by a different user and sends the funds to the keyOwner.
-   * @param _keyManager the key managed by this user will be canceled
-   * @param _v _r _s getCancelAndRefundApprovalHash signed by the _keyManager
-   * @param _tokenId The key to cancel
-   */
-  function cancelAndRefundFor(
-    address _keyManager,
-    uint8 _v,
-    bytes32 _r,
-    bytes32 _s,
-    uint _tokenId
-  ) external;
-
-  /**
-   * @notice Sets the minimum nonce for a valid off-chain approval message from the
-   * senders account.
-   * @dev This can be used to invalidate a previously signed message.
-   */
-  function invalidateOffchainApproval(uint _nextAvailableNonce) external;
-
-  /**
-   * Allow a Lock manager to change the refund penalty.
-   * @dev Throws if called by other than a Lock manager
-   * @param _freeTrialLength The new duration of free trials for this lock
-   * @param _refundPenaltyBasisPoints The new refund penaly in basis-points(bps)
-   */
-  function updateRefundPenalty(
-    uint _freeTrialLength,
-    uint _refundPenaltyBasisPoints
-  ) external;
-
-  /**
-   * @dev Determines how much of a refund a key owner would receive if they issued
-   * @param _keyOwner The key owner to get the refund value for.
-   * a cancelAndRefund block.timestamp.
-   * Note that due to the time required to mine a tx, the actual refund amount will be lower
-   * than what the user reads from this call.
-   */
-  function getCancelAndRefundValueFor(
-    address _keyOwner
-  ) external view returns (uint refund);
-
-  function keyManagerToNonce(address) external view returns (uint256);
-
-  /**
-   * @notice returns the hash to sign in order to allow another user to cancel on your behalf.
-   * @dev this can be computed in JS instead of read from the contract.
-   * @param _keyManager The key manager's address (also the message signer)
-   * @param _txSender The address cancelling cancel on behalf of the keyOwner
-   * @return approvalHash The hash to sign
-   */
-  function getCancelAndRefundApprovalHash(
-    address _keyManager,
-    address _txSender
-  ) external view returns (bytes32 approvalHash);
-
-  function addKeyGranter(address account) external;
-
-  function addLockManager(address account) external;
-
-  function isKeyGranter(address account) external view returns (bool);
-
-  function isLockManager(address account) external view returns (bool);
-
-  function onKeyPurchaseHook() external view returns (address);
-
-  function onKeyCancelHook() external view returns (address);
-
-  function revokeKeyGranter(address _granter) external;
-
-  function renounceLockManager() external;
-
-  ///===================================================================
-  /// Auto-generated getter functions from public state variables
-
-  function beneficiary() external view returns (address);
-
-  function expirationDuration() external view returns (uint256);
-
-  function freeTrialLength() external view returns (uint256);
-
-  function isAlive() external view returns (bool);
-
-  function keyPrice() external view returns (uint256);
-
-  function maxNumberOfKeys() external view returns (uint256);
-
-  function owners(uint256) external view returns (address);
-
-  function refundPenaltyBasisPoints() external view returns (uint256);
-
-  function tokenAddress() external view returns (address);
-
-  function transferFeeBasisPoints() external view returns (uint256);
-
-  function unlockProtocol() external view returns (address);
-
-  function keyManagerOf(uint) external view returns (address);
-
-  ///===================================================================
-
-  /**
-   * @notice Allows the key owner to safely share their key (parent key) by
-   * transferring a portion of the remaining time to a new key (child key).
-   * @dev Throws if key is not valid.
-   * @dev Throws if `_to` is the zero address
-   * @param _to The recipient of the shared key
-   * @param _tokenId the key to share
-   * @param _timeShared The amount of time shared
-   * checks if `_to` is a smart contract (code size > 0). If so, it calls
-   * `onERC721Received` on `_to` and throws if the return value is not
-   * `bytes4(keccak256('onERC721Received(address,address,uint,bytes)'))`.
-   * @dev Emit Transfer event
-   */
-  function shareKey(address _to, uint _tokenId, uint _timeShared) external;
-
-  /**
-   * @notice Update transfer and cancel rights for a given key
-   * @param _tokenId The id of the key to assign rights for
-   * @param _keyManager The address to assign the rights to for the given key
-   */
-  function setKeyManagerOf(uint _tokenId, address _keyManager) external;
-
-  /// @notice A descriptive name for a collection of NFTs in this contract
-  function name() external view returns (string memory _name);
-
-  ///===================================================================
-
-  /// From ERC165.sol
-  function supportsInterface(bytes4 interfaceId) external view returns (bool);
-
-  ///===================================================================
-
-  /// From ERC-721
-  /**
-   * @dev Returns the number of NFTs in `owner`'s account.
-   */
-  function balanceOf(address _owner) public view returns (uint256 balance);
-
-  /**
-   * @dev Returns the owner of the NFT specified by `tokenId`.
-   */
-  function ownerOf(uint256 tokenId) public view returns (address _owner);
-
-  /**
-   * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
-   * another (`to`).
-   *
-   *
-   *
-   * Requirements:
-   * - `from`, `to` cannot be zero.
-   * - `tokenId` must be owned by `from`.
-   * - If the caller is not `from`, it must be have been allowed to move this
-   * NFT by either `approve` or `setApprovalForAll`.
-   */
-  function safeTransferFrom(address from, address to, uint256 tokenId) public;
-
-  /**
-   * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
-   * another (`to`).
-   *
-   * Requirements:
-   * - If the caller is not `from`, it must be approved to move this NFT by
-   * either `approve` or `setApprovalForAll`.
-   */
-  function transferFrom(address from, address to, uint256 tokenId) public;
-
-  function approve(address to, uint256 tokenId) public;
-
-  /**
-   * @notice Get the approved address for a single NFT
-   * @dev Throws if `_tokenId` is not a valid NFT.
-   * @param _tokenId The NFT to find the approved address for
-   * @return The approved address for this NFT, or the zero address if there is none
-   */
-  function getApproved(uint256 _tokenId) public view returns (address operator);
-
-  function setApprovalForAll(address operator, bool _approved) public;
-
-  function isApprovedForAll(
-    address _owner,
-    address operator
-  ) public view returns (bool);
-
-  function safeTransferFrom(
-    address from,
-    address to,
-    uint256 tokenId,
-    bytes memory data
-  ) public;
-
-  function totalSupply() public view returns (uint256);
-
-  function tokenOfOwnerByIndex(
-    address _owner,
-    uint256 index
-  ) public view returns (uint256 tokenId);
-
-  function tokenByIndex(uint256 index) public view returns (uint256);
-
-  /**
-   * @notice An ERC-20 style transfer.
-   * @param _value sends a token with _value * expirationDuration (the amount of time remaining on a standard purchase).
-   * @dev The typical use case would be to call this with _value 1, which is on par with calling `transferFrom`. If the user
-   * has more than `expirationDuration` time remaining this may use the `shareKey` function to send some but not all of the token.
-   */
-  function transfer(address _to, uint _value) external returns (bool success);
-}
-
-// File contracts/interfaces/IUnlock.sol
-
-pragma solidity 0.5.17;
-
-/**
- * @title The Unlock Interface
- **/
-
-interface IUnlock {
-  // Use initialize instead of a constructor to support proxies(for upgradeability via zos).
-  function initialize(address _unlockOwner) external;
-
-  /**
-   * @dev Create lock
-   * This deploys a lock for a creator. It also keeps track of the deployed lock.
-   * @param _tokenAddress set to the ERC20 token address, or 0 for ETH.
-   * @param _salt an identifier for the Lock, which is unique for the user.
-   * This may be implemented as a sequence ID or with RNG. It's used with `create2`
-   * to know the lock's address before the transaction is mined.
-   */
-  function createLock(
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys,
-    string calldata _lockName,
-    bytes12 _salt
-  ) external;
-
-  /**
-   * This function keeps track of the added GDP, as well as grants of discount tokens
-   * to the referrer, if applicable.
-   * The number of discount tokens granted is based on the value of the referal,
-   * the current growth rate and the lock's discount token distribution rate
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordKeyPurchase(
-    uint _value,
-    address _referrer // solhint-disable-line no-unused-vars
-  ) external;
-
-  /**
-   * This function will keep track of consumed discounts by a given user.
-   * It will also grant discount tokens to the creator who is granting the discount based on the
-   * amount of discount and compensation rate.
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordConsumedDiscount(
-    uint _discount,
-    uint _tokens // solhint-disable-line no-unused-vars
-  ) external;
-
-  /**
-   * This function returns the discount available for a user, when purchasing a
-   * a key from a lock.
-   * This does not modify the state. It returns both the discount and the number of tokens
-   * consumed to grant that discount.
-   */
-  function computeAvailableDiscountFor(
-    address _purchaser, // solhint-disable-line no-unused-vars
-    uint _keyPrice // solhint-disable-line no-unused-vars
-  ) external view returns (uint discount, uint tokens);
-
-  // Function to read the globalTokenURI field.
-  function globalBaseTokenURI() external view returns (string memory);
-
-  /**
-   * @dev Redundant with globalBaseTokenURI() for backwards compatibility with v3 & v4 locks.
-   */
-  function getGlobalBaseTokenURI() external view returns (string memory);
-
-  // Function to read the globalTokenSymbol field.
-  function globalTokenSymbol() external view returns (string memory);
-
-  /**
-   * @dev Redundant with globalTokenSymbol() for backwards compatibility with v3 & v4 locks.
-   */
-  function getGlobalTokenSymbol() external view returns (string memory);
-
-  /**
-   * @notice Allows the owner to update configuration variables
-   */
-  function configUnlock(
-    address _udt,
-    address _weth,
-    uint _estimatedGasForPurchase,
-    string calldata _symbol,
-    string calldata _URI
-  ) external;
-
-  /**
-   * @notice Upgrade the PublicLock template used for future calls to `createLock`.
-   * @dev This will initialize the template and revokeOwnership.
-   */
-  function setLockTemplate(address payable _publicLockAddress) external;
-
-  // Allows the owner to change the value tracking variables as needed.
-  function resetTrackedValue(
-    uint _grossNetworkProduct,
-    uint _totalDiscountGranted
-  ) external;
-
-  function grossNetworkProduct() external view returns (uint);
-
-  function totalDiscountGranted() external view returns (uint);
-
-  function locks(
-    address
-  )
-    external
-    view
-    returns (bool deployed, uint totalSales, uint yieldedDiscountTokens);
-
-  // The address of the public lock template, used when `createLock` is called
-  function publicLockAddress() external view returns (address);
-
-  // Map token address to exchange contract address if the token is supported
-  // Used for GDP calculations
-  function uniswapOracles(address) external view returns (address);
-
-  // The WETH token address, used for value calculations
-  function weth() external view returns (address);
-
-  // The UDT token address, used to mint tokens on referral
-  function udt() external view returns (address);
-
-  // The approx amount of gas required to purchase a key
-  function estimatedGasForPurchase() external view returns (uint);
-
-  // The version number of the current Unlock implementation on this network
-  function unlockVersion() external pure returns (uint16);
-
-  /**
-   * @notice allows the owner to set the oracle address to use for value conversions
-   * setting the _oracleAddress to address(0) removes support for the token
-   * @dev This will also call update to ensure at least one datapoint has been recorded.
-   */
-  function setOracle(address _tokenAddress, address _oracleAddress) external;
-
-  /**
-   * @dev Returns true if the caller is the current owner.
-   */
-  function isOwner() external view returns (bool);
-
-  /**
-   * @dev Returns the address of the current owner.
-   */
-  function owner() external view returns (address);
-
-  /**
-   * @dev Leaves the contract without owner. It will not be possible to call
-   * `onlyOwner` functions anymore. Can only be called by the current owner.
-   *
-   * NOTE: Renouncing ownership will leave the contract without an owner,
-   * thereby removing any functionality that is only available to the owner.
-   */
-  function renounceOwnership() external;
-
-  /**
-   * @dev Transfers ownership of the contract to a new account (`newOwner`).
-   * Can only be called by the current owner.
-   */
-  function transferOwnership(address newOwner) external;
-}
-
-// File @openzeppelin/contracts-ethereum-package/contracts/utils/Address.sol@v2.5.0
-
-pragma solidity ^0.5.5;
-
-/**
- * @dev Collection of functions related to the address type
- */
-library Address {
-  /**
-   * @dev Returns true if `account` is a contract.
-   *
-   * [IMPORTANT]
-   * ====
-   * It is unsafe to assume that an address for which this function returns
-   * false is an externally-owned account (EOA) and not a contract.
-   *
-   * Among others, `isContract` will return false for the following
-   * types of addresses:
-   *
-   *  - an externally-owned account
-   *  - a contract in construction
-   *  - an address where a contract will be created
-   *  - an address where a contract lived, but was destroyed
-   * ====
-   */
-  function isContract(address account) internal view returns (bool) {
-    // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
-    // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
-    // for accounts without code, i.e. `keccak256('')`
-    bytes32 codehash;
-    bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
-    // solhint-disable-next-line no-inline-assembly
-    assembly {
-      codehash := extcodehash(account)
-    }
-    return (codehash != accountHash && codehash != 0x0);
-  }
-
-  /**
-   * @dev Converts an `address` into `address payable`. Note that this is
-   * simply a type cast: the actual underlying value is not changed.
-   *
-   * _Available since v2.4.0._
-   */
-  function toPayable(address account) internal pure returns (address payable) {
-    return address(uint160(account));
-  }
-
-  /**
-   * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
-   * `recipient`, forwarding all available gas and reverting on errors.
-   *
-   * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
-   * of certain opcodes, possibly making contracts go over the 2300 gas limit
-   * imposed by `transfer`, making them unable to receive funds via
-   * `transfer`. {sendValue} removes this limitation.
-   *
-   * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
-   *
-   * IMPORTANT: because control is transferred to `recipient`, care must be
-   * taken to not create reentrancy vulnerabilities. Consider using
-   * {ReentrancyGuard} or the
-   * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
-   *
-   * _Available since v2.4.0._
-   */
-  function sendValue(address payable recipient, uint256 amount) internal {
-    require(address(this).balance >= amount, "Address: insufficient balance");
-
-    // solhint-disable-next-line avoid-call-value
-    (bool success, ) = recipient.call.value(amount)("");
-    require(
-      success,
-      "Address: unable to send value, recipient may have reverted"
-    );
-  }
-}
-
-// File hardlydifficult-eth/contracts/protocols/Uniswap/IUniswapOracle.sol@v1.1.1
-
-// SPDX-License-Identifier: MIT
-pragma solidity >=0.5.0;
-
-interface IUniswapOracle {
-  function PERIOD() external returns (uint);
-
-  function factory() external returns (address);
-
-  function update(address _tokenIn, address _tokenOut) external;
-
-  function consult(
-    address _tokenIn,
-    uint _amountIn,
-    address _tokenOut
-  ) external view returns (uint _amountOut);
-
-  function updateAndConsult(
-    address _tokenIn,
-    uint _amountIn,
-    address _tokenOut
-  ) external returns (uint _amountOut);
-}
-
-// File @openzeppelin/contracts-ethereum-package/contracts/math/SafeMath.sol@v2.5.0
-
-pragma solidity ^0.5.0;
-
-/**
- * @dev Wrappers over Solidity's arithmetic operations with added overflow
- * checks.
- *
- * Arithmetic operations in Solidity wrap on overflow. This can easily result
- * in bugs, because programmers usually assume that an overflow raises an
- * error, which is the standard behavior in high level programming languages.
- * `SafeMath` restores this intuition by reverting the transaction when an
- * operation overflows.
- *
- * Using this library instead of the unchecked operations eliminates an entire
- * class of bugs, so it's recommended to use it always.
- */
-library SafeMath {
-  /**
-   * @dev Returns the addition of two unsigned integers, reverting on
-   * overflow.
-   *
-   * Counterpart to Solidity's `+` operator.
-   *
-   * Requirements:
-   * - Addition cannot overflow.
-   */
-  function add(uint256 a, uint256 b) internal pure returns (uint256) {
-    uint256 c = a + b;
-    require(c >= a, "SafeMath: addition overflow");
-
-    return c;
-  }
-
-  /**
-   * @dev Returns the subtraction of two unsigned integers, reverting on
-   * overflow (when the result is negative).
-   *
-   * Counterpart to Solidity's `-` operator.
-   *
-   * Requirements:
-   * - Subtraction cannot overflow.
-   */
-  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
-    return sub(a, b, "SafeMath: subtraction overflow");
-  }
-
-  /**
-   * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
-   * overflow (when the result is negative).
-   *
-   * Counterpart to Solidity's `-` operator.
-   *
-   * Requirements:
-   * - Subtraction cannot overflow.
-   *
-   * _Available since v2.4.0._
-   */
-  function sub(
-    uint256 a,
-    uint256 b,
-    string memory errorMessage
-  ) internal pure returns (uint256) {
-    require(b <= a, errorMessage);
-    uint256 c = a - b;
-
-    return c;
-  }
-
-  /**
-   * @dev Returns the multiplication of two unsigned integers, reverting on
-   * overflow.
-   *
-   * Counterpart to Solidity's `*` operator.
-   *
-   * Requirements:
-   * - Multiplication cannot overflow.
-   */
-  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
-    // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
-    // benefit is lost if 'b' is also tested.
-    // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
-    if (a == 0) {
-      return 0;
-    }
-
-    uint256 c = a * b;
-    require(c / a == b, "SafeMath: multiplication overflow");
-
-    return c;
-  }
-
-  /**
-   * @dev Returns the integer division of two unsigned integers. Reverts on
-   * division by zero. The result is rounded towards zero.
-   *
-   * Counterpart to Solidity's `/` operator. Note: this function uses a
-   * `revert` opcode (which leaves remaining gas untouched) while Solidity
-   * uses an invalid opcode to revert (consuming all remaining gas).
-   *
-   * Requirements:
-   * - The divisor cannot be zero.
-   */
-  function div(uint256 a, uint256 b) internal pure returns (uint256) {
-    return div(a, b, "SafeMath: division by zero");
-  }
-
-  /**
-   * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
-   * division by zero. The result is rounded towards zero.
-   *
-   * Counterpart to Solidity's `/` operator. Note: this function uses a
-   * `revert` opcode (which leaves remaining gas untouched) while Solidity
-   * uses an invalid opcode to revert (consuming all remaining gas).
-   *
-   * Requirements:
-   * - The divisor cannot be zero.
-   *
-   * _Available since v2.4.0._
-   */
-  function div(
-    uint256 a,
-    uint256 b,
-    string memory errorMessage
-  ) internal pure returns (uint256) {
-    // Solidity only automatically asserts when dividing by 0
-    require(b > 0, errorMessage);
-    uint256 c = a / b;
-    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
-
-    return c;
-  }
-
-  /**
-   * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
-   * Reverts when dividing by zero.
-   *
-   * Counterpart to Solidity's `%` operator. This function uses a `revert`
-   * opcode (which leaves remaining gas untouched) while Solidity uses an
-   * invalid opcode to revert (consuming all remaining gas).
-   *
-   * Requirements:
-   * - The divisor cannot be zero.
-   */
-  function mod(uint256 a, uint256 b) internal pure returns (uint256) {
-    return mod(a, b, "SafeMath: modulo by zero");
-  }
-
-  /**
-   * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
-   * Reverts with custom message when dividing by zero.
-   *
-   * Counterpart to Solidity's `%` operator. This function uses a `revert`
-   * opcode (which leaves remaining gas untouched) while Solidity uses an
-   * invalid opcode to revert (consuming all remaining gas).
-   *
-   * Requirements:
-   * - The divisor cannot be zero.
-   *
-   * _Available since v2.4.0._
-   */
-  function mod(
-    uint256 a,
-    uint256 b,
-    string memory errorMessage
-  ) internal pure returns (uint256) {
-    require(b != 0, errorMessage);
-    return a % b;
-  }
-}
-
-// File contracts/interfaces/IMintableERC20.sol
-
-pragma solidity 0.5.17;
-
-interface IMintableERC20 {
-  function mint(address account, uint256 amount) external returns (bool);
-
-  function totalSupply() external returns (uint);
-}
-
-// File contracts/Unlock.sol
-
-pragma solidity 0.5.17;
-
-/**
- * @title The Unlock contract
- * @author Julien Genestoux (unlock-protocol.com)
- * This smart contract has 3 main roles:
- *  1. Distribute discounts to discount token holders
- *  2. Grant dicount tokens to users making referrals and/or publishers granting discounts.
- *  3. Create & deploy Public Lock contracts.
- * In order to achieve these 3 elements, it keeps track of several things such as
- *  a. Deployed locks addresses and balances of discount tokens granted by each lock.
- *  b. The total network product (sum of all key sales, net of discounts)
- *  c. Total of discounts granted
- *  d. Balances of discount tokens, including 'frozen' tokens (which have been used to claim
- * discounts and cannot be used/transferred for a given period)
- *  e. Growth rate of Network Product
- *  f. Growth rate of Discount tokens supply
- * The smart contract has an owner who only can perform the following
- *  - Upgrades
- *  - Change in golden rules (20% of GDP available in discounts, and supply growth rate is at most
- * 50% of GNP growth rate)
- * NOTE: This smart contract is partially implemented for now until enough Locks are deployed and
- * in the wild.
- * The partial implementation includes the following features:
- *  a. Keeping track of deployed locks
- *  b. Keeping track of GNP
- */
-
-/// @dev Must list the direct base contracts in the order from “most base-like” to “most derived”.
-/// https://solidity.readthedocs.io/en/latest/contracts.html#multiple-inheritance-and-linearization
-contract Unlock is IUnlock, Initializable, Ownable {
-  using Address for address;
-  using Clone2Factory for address;
-  using SafeMath for uint;
-
-  /**
-   * The struct for a lock
-   * We use deployed to keep track of deployments.
-   * This is required because both totalSales and yieldedDiscountTokens are 0 when initialized,
-   * which would be the same values when the lock is not set.
-   */
-  struct LockBalances {
-    bool deployed;
-    uint totalSales; // This is in wei
-    uint yieldedDiscountTokens;
-  }
-
-  modifier onlyFromDeployedLock() {
-    require(locks[msg.sender].deployed, "ONLY_LOCKS");
-    _;
-  }
-
-  uint public grossNetworkProduct;
-
-  uint public totalDiscountGranted;
-
-  // We keep track of deployed locks to ensure that callers are all deployed locks.
-  mapping(address => LockBalances) public locks;
-
-  // global base token URI
-  // Used by locks where the owner has not set a custom base URI.
-  string public globalBaseTokenURI;
-
-  // global base token symbol
-  // Used by locks where the owner has not set a custom symbol
-  string public globalTokenSymbol;
-
-  // The address of the public lock template, used when `createLock` is called
-  address public publicLockAddress;
-
-  // Map token address to oracle contract address if the token is supported
-  // Used for GDP calculations
-  mapping(address => IUniswapOracle) public uniswapOracles;
-
-  // The WETH token address, used for value calculations
-  address public weth;
-
-  // The UDT token address, used to mint tokens on referral
-  address public udt;
-
-  // The approx amount of gas required to purchase a key
-  uint public estimatedGasForPurchase;
-
-  // Events
-  event NewLock(address indexed lockOwner, address indexed newLockAddress);
-
-  event ConfigUnlock(
-    address udt,
-    address weth,
-    uint estimatedGasForPurchase,
-    string globalTokenSymbol,
-    string globalTokenURI
-  );
-
-  event SetLockTemplate(address publicLockAddress);
-
-  event ResetTrackedValue(uint grossNetworkProduct, uint totalDiscountGranted);
-
-  // Use initialize instead of a constructor to support proxies (for upgradeability via zos).
-  function initialize(address _unlockOwner) public initializer {
-    // We must manually initialize Ownable.sol
-    Ownable.initialize(_unlockOwner);
-  }
-
-  /**
-   * @dev Create lock
-   * This deploys a lock for a creator. It also keeps track of the deployed lock.
-   * @param _tokenAddress set to the ERC20 token address, or 0 for ETH.
-   * @param _salt an identifier for the Lock, which is unique for the user.
-   * This may be implemented as a sequence ID or with RNG. It's used with `create2`
-   * to know the lock's address before the transaction is mined.
-   */
-  function createLock(
-    uint _expirationDuration,
-    address _tokenAddress,
-    uint _keyPrice,
-    uint _maxNumberOfKeys,
-    string memory _lockName,
-    bytes12 _salt
-  ) public {
-    require(publicLockAddress != address(0), "MISSING_LOCK_TEMPLATE");
-
-    // create lock
-    bytes32 salt;
-    // solium-disable-next-line
-    assembly {
-      let pointer := mload(0x40)
-      // The salt is the msg.sender
-      mstore(pointer, shl(96, caller))
-      // followed by the _salt provided
-      mstore(add(pointer, 0x14), _salt)
-      salt := mload(pointer)
-    }
-    address payable newLock = address(
-      uint160(publicLockAddress.createClone2(salt))
-    );
-    IPublicLock(newLock).initialize(
-      msg.sender,
-      _expirationDuration,
-      _tokenAddress,
-      _keyPrice,
-      _maxNumberOfKeys,
-      _lockName
-    );
-
-    // Assign the new Lock
-    locks[newLock] = LockBalances({
-      deployed: true,
-      totalSales: 0,
-      yieldedDiscountTokens: 0
-    });
-
-    // trigger event
-    emit NewLock(msg.sender, newLock);
-  }
-
-  /**
-   * This function returns the discount available for a user, when purchasing a
-   * a key from a lock.
-   * This does not modify the state. It returns both the discount and the number of tokens
-   * consumed to grant that discount.
-   * TODO: actually implement this.
-   */
-  function computeAvailableDiscountFor(
-    address /* _purchaser */,
-    uint /* _keyPrice */
-  ) public view returns (uint discount, uint tokens) {
-    // TODO: implement me
-    return (0, 0);
-  }
-
-  /**
-   * This function keeps track of the added GDP, as well as grants of discount tokens
-   * to the referrer, if applicable.
-   * The number of discount tokens granted is based on the value of the referal,
-   * the current growth rate and the lock's discount token distribution rate
-   * This function is invoked by a previously deployed lock only.
-   * TODO: actually implement
-   */
-  function recordKeyPurchase(
-    uint _value,
-    address _referrer
-  ) public onlyFromDeployedLock {
-    if (_value > 0) {
-      uint valueInETH;
-      address tokenAddress = IPublicLock(msg.sender).tokenAddress();
-      if (tokenAddress != address(0) && tokenAddress != weth) {
-        // If priced in an ERC-20 token, find the supported uniswap oracle
-        IUniswapOracle oracle = uniswapOracles[tokenAddress];
-        if (address(oracle) != address(0)) {
-          valueInETH = oracle.updateAndConsult(tokenAddress, _value, weth);
-        }
-      } else {
-        // If priced in ETH (or value is 0), no conversion is required
-        valueInETH = _value;
-      }
-
-      grossNetworkProduct = grossNetworkProduct.add(valueInETH);
-      // If GNP does not overflow, the lock totalSales should be safe
-      locks[msg.sender].totalSales += valueInETH;
-
-      // Mint UDT
-      if (_referrer != address(0)) {
-        IUniswapOracle udtOracle = uniswapOracles[udt];
-        if (address(udtOracle) != address(0)) {
-          // Get the value of 1 UDT (w/ 18 decimals) in ETH
-          uint udtPrice = udtOracle.updateAndConsult(udt, 10 ** 18, weth);
-
-          // tokensToMint is either == to the gas cost times 1.25 to cover the 20% dev cut
-          uint tokensToMint = (estimatedGasForPurchase * tx.gasprice).mul(
-            125 * 10 ** 18
-          ) /
-            100 /
-            udtPrice;
-          // or tokensToMint is capped by percent growth
-          uint maxTokens = IMintableERC20(udt).totalSupply().mul(valueInETH) /
-            2 /
-            grossNetworkProduct;
-          if (tokensToMint > maxTokens) {
-            tokensToMint = maxTokens;
-          }
-
-          if (tokensToMint > 0) {
-            // 80% goes to the referrer, 20% to the Unlock dev - round in favor of the referrer
-            uint devReward = tokensToMint.mul(20) / 100;
-            IMintableERC20(udt).mint(_referrer, tokensToMint - devReward);
-            if (devReward > 0) {
-              IMintableERC20(udt).mint(owner(), devReward);
-            }
-          }
-        }
-      }
-    }
-  }
-
-  /**
-   * This function will keep track of consumed discounts by a given user.
-   * It will also grant discount tokens to the creator who is granting the discount based on the
-   * amount of discount and compensation rate.
-   * This function is invoked by a previously deployed lock only.
-   */
-  function recordConsumedDiscount(
-    uint _discount,
-    uint /* _tokens */
-  ) public onlyFromDeployedLock {
-    // TODO: implement me
-    totalDiscountGranted += _discount;
-    return;
-  }
-
-  // The version number of the current Unlock implementation on this network
-  function unlockVersion() external pure returns (uint16) {
-    return 8;
-  }
-
-  /**
-   * @notice Allows the owner to update configuration variables
-   */
-  function configUnlock(
-    address _udt,
-    address _weth,
-    uint _estimatedGasForPurchase,
-    string calldata _symbol,
-    string calldata _URI
-  ) external onlyOwner {
-    udt = _udt;
-    weth = _weth;
-    estimatedGasForPurchase = _estimatedGasForPurchase;
-
-    globalTokenSymbol = _symbol;
-    globalBaseTokenURI = _URI;
-
-    emit ConfigUnlock(_udt, _weth, _estimatedGasForPurchase, _symbol, _URI);
-  }
-
-  /**
-   * @notice Upgrade the PublicLock template used for future calls to `createLock`.
-   * @dev This will initialize the template and revokeOwnership.
-   */
-  function setLockTemplate(
-    address payable _publicLockAddress
-  ) external onlyOwner {
-    // First claim the template so that no-one else could
-    // this will revert if the template was already initialized.
-    IPublicLock(_publicLockAddress).initialize(
-      address(this),
-      0,
-      address(0),
-      0,
-      0,
-      ""
-    );
-    IPublicLock(_publicLockAddress).renounceLockManager();
-
-    publicLockAddress = _publicLockAddress;
-
-    emit SetLockTemplate(_publicLockAddress);
-  }
-
-  /**
-   * @notice allows the owner to set the oracle address to use for value conversions
-   * setting the _oracleAddress to address(0) removes support for the token
-   * @dev This will also call update to ensure at least one datapoint has been recorded.
-   */
-  function setOracle(
-    address _tokenAddress,
-    address _oracleAddress
-  ) external onlyOwner {
-    uniswapOracles[_tokenAddress] = IUniswapOracle(_oracleAddress);
-    if (_oracleAddress != address(0)) {
-      IUniswapOracle(_oracleAddress).update(_tokenAddress, weth);
-    }
-  }
-
-  // Allows the owner to change the value tracking variables as needed.
-  function resetTrackedValue(
-    uint _grossNetworkProduct,
-    uint _totalDiscountGranted
-  ) external onlyOwner {
-    grossNetworkProduct = _grossNetworkProduct;
-    totalDiscountGranted = _totalDiscountGranted;
-
-    emit ResetTrackedValue(_grossNetworkProduct, _totalDiscountGranted);
-  }
-
-  /**
-   * @dev Redundant with globalBaseTokenURI() for backwards compatibility with v3 & v4 locks.
-   */
-  function getGlobalBaseTokenURI() external view returns (string memory) {
-    return globalBaseTokenURI;
-  }
-
-  /**
-   * @dev Redundant with globalTokenSymbol() for backwards compatibility with v3 & v4 locks.
-   */
-  function getGlobalTokenSymbol() external view returns (string memory) {
-    return globalTokenSymbol;
-  }
-}
diff --git a/packages/unlock-js/scripts/compressAbi.js b/packages/unlock-js/scripts/compressAbi.js
index c4242bc9761..f14dda0165c 100644
--- a/packages/unlock-js/scripts/compressAbi.js
+++ b/packages/unlock-js/scripts/compressAbi.js
@@ -11,29 +11,8 @@ const fs = require('fs')
 const path = require('path')
 const abis = require('@unlock-protocol/contracts')
 
-const unlockVersions = [
-  'v4',
-  'v6',
-  'v7',
-  'v8',
-  'v9',
-  'v10',
-  'v11',
-  'v12',
-  'v13',
-]
-const publicLockVersions = [
-  'v4',
-  'v6',
-  'v7',
-  'v8',
-  'v9',
-  'v10',
-  'v11',
-  'v12',
-  'v13',
-  'v14',
-]
+const unlockVersions = ['v9', 'v10', 'v11', 'v12', 'v13']
+const publicLockVersions = ['v9', 'v10', 'v11', 'v12', 'v13', 'v14']
 
 const data = {
   PublicLock: publicLockVersions.reduce(
diff --git a/packages/unlock-js/src/abis.ts b/packages/unlock-js/src/abis.ts
index 28587ef4857..b7cccec5799 100644
--- a/packages/unlock-js/src/abis.ts
+++ b/packages/unlock-js/src/abis.ts
@@ -4,377 +4,6 @@
 
 const abis = {
   "PublicLock": {
-    "v4": {
-      "contractName": "PublicLock",
-      "abi": [
-        "function supportsInterface(bytes4 interfaceId) constant view returns (bool)",
-        "function owners(uint256) constant view returns (address)",
-        "function name() constant view returns (string)",
-        "function getApproved(uint256 _tokenId) constant view returns (address)",
-        "function approve(address _approved,uint256 _tokenId) payable",
-        "function updateBeneficiary(address _beneficiary)",
-        "function refundPenaltyDenominator() constant view returns (uint256)",
-        "function refundPenaltyNumerator() constant view returns (uint256)",
-        "function unlockProtocol() constant view returns (address)",
-        "function getOwnersByPage(uint256 _page,uint256 _pageSize) constant view returns (address[])",
-        "function keyPrice() constant view returns (uint256)",
-        "function expirationDuration() constant view returns (uint256)",
-        "function onERC721Received(address,address,uint256,bytes) returns (bytes4)",
-        "function totalSupply() constant view returns (uint256)",
-        "function updateKeyPrice(uint256 _keyPrice)",
-        "function cancelAndRefund()",
-        "function transferFrom(address _from,address _recipient,uint256 _tokenId) payable",
-        "function withdraw(uint256 _amount)",
-        "function setBaseTokenURI(string _baseTokenURI)",
-        "function beneficiary() constant view returns (address)",
-        "function updateRefundPenalty(uint256 _refundPenaltyNumerator,uint256 _refundPenaltyDenominator)",
-        "function numberOfKeysSold() constant view returns (uint256)",
-        "function updateTransferFee(uint256 _transferFeeNumerator,uint256 _transferFeeDenominator)",
-        "function isAlive() constant view returns (bool)",
-        "function safeTransferFrom(address _from,address _to,uint256 _tokenId) payable",
-        "function strConcat(string _a,string _b,string _c,string _d) constant pure returns (string _concatenatedString)",
-        "function keyOwnerToNonce(address) constant view returns (uint256)",
-        "function uint2Str(uint256 _i) constant pure returns (string _uintAsString)",
-        "function getCancelAndRefundValueFor(address _owner) constant view returns (uint256 refund)",
-        "function updateLockName(string _lockName)",
-        "function address2Str(address _addr) constant pure returns (string)",
-        "function incrementNonce()",
-        "function ownerOf(uint256 _tokenId) constant view returns (address)",
-        "function getHasValidKey(address _owner) constant view returns (bool)",
-        "function balanceOf(address _owner) constant view returns (uint256)",
-        "function purchaseForFrom(address _recipient,address _referrer) payable",
-        "function renounceOwnership()",
-        "function maxNumberOfKeys() constant view returns (uint256)",
-        "function updateLockSymbol(string _lockSymbol)",
-        "function grantKeys(address[] _recipients,uint256[] _expirationTimestamps)",
-        "function getTransferFee(address _owner) constant view returns (uint256)",
-        "function getCancelAndRefundApprovalHash(address _keyOwner,address _txSender) constant view returns (bytes32 approvalHash)",
-        "function owner() constant view returns (address)",
-        "function isOwner() constant view returns (bool)",
-        "function transferFeeNumerator() constant view returns (uint256)",
-        "function numberOfOwners() constant view returns (uint256)",
-        "function symbol() constant view returns (string)",
-        "function getTokenIdFor(address _account) constant view returns (uint256)",
-        "function isKeyOwner(uint256 _tokenId,address _owner) constant view returns (bool)",
-        "function grantKey(address _recipient,uint256 _expirationTimestamp)",
-        "function tokenAddress() constant view returns (address)",
-        "function expireKeyFor(address _owner)",
-        "function setApprovalForAll(address _to,bool _approved)",
-        "function destroyLock()",
-        "function keyExpirationTimestampFor(address _owner) constant view returns (uint256 timestamp)",
-        "function safeTransferFrom(address _from,address _to,uint256 _tokenId,bytes _data) payable",
-        "function cancelAndRefundFor(address _keyOwner,bytes _signature)",
-        "function disableLock()",
-        "function initialize(address sender)",
-        "function tokenURI(uint256 _tokenId) constant view returns (string)",
-        "function transferFeeDenominator() constant view returns (uint256)",
-        "function isApprovedForAll(address _owner,address _operator) constant view returns (bool)",
-        "function transferOwnership(address newOwner)",
-        "function purchaseFor(address _recipient) payable",
-        "function getBalance(address _account) constant view returns (uint256)",
-        "function grantKeys(address[] _recipients,uint256 _expirationTimestamp)",
-        "event CancelKey (uint256 indexed tokenId,address indexed owner,address indexed sendTo,uint256 refund)",
-        "event RefundPenaltyChanged (uint256 oldRefundPenaltyNumerator,uint256 oldRefundPenaltyDenominator,uint256 refundPenaltyNumerator,uint256 refundPenaltyDenominator)",
-        "event TransferFeeChanged (uint256 oldTransferFeeNumerator,uint256 oldTransferFeeDenominator,uint256 transferFeeNumerator,uint256 transferFeeDenominator)",
-        "event NewLockSymbol (string symbol)",
-        "event ExpireKey (uint256 tokenId)",
-        "event PriceChanged (uint256 oldKeyPrice,uint256 keyPrice)",
-        "event Withdrawal (address indexed sender,address indexed beneficiary,uint256 amount)",
-        "event Destroy (uint256 balance,address indexed owner)",
-        "event Disable ()",
-        "event OwnershipTransferred (address indexed previousOwner,address indexed newOwner)",
-        "event Transfer (address indexed _from,address indexed _to,uint256 indexed _tokenId)",
-        "event Approval (address indexed _owner,address indexed _approved,uint256 indexed _tokenId)",
-        "event ApprovalForAll (address indexed _owner,address indexed _operator,bool _approved)",
-        "function publicLockVersion() constant pure returns (uint16)"
-      ],
-      "bytecodeHash": "0x0d7ea1df12ab87024edd7add411416ee61a3f09cf41a0b6aa5499e1bc4277651"
-    },
-    "v6": {
-      "contractName": "PublicLock",
-      "abi": [
-        "event Approval (address indexed owner,address indexed approved,uint256 indexed tokenId)",
-        "event ApprovalForAll (address indexed owner,address indexed operator,bool approved)",
-        "event CancelKey (uint256 indexed tokenId,address indexed owner,address indexed sendTo,uint256 refund)",
-        "event Destroy (uint256 balance,address indexed owner)",
-        "event Disable ()",
-        "event ExpireKey (uint256 indexed tokenId)",
-        "event LockManagerAdded (address indexed account)",
-        "event LockManagerRemoved (address indexed account)",
-        "event NewLockSymbol (string symbol)",
-        "event NonceChanged (address indexed keyOwner,uint256 nextAvailableNonce)",
-        "event OwnershipTransferred (address indexed previousOwner,address indexed newOwner)",
-        "event PricingChanged (uint256 oldKeyPrice,uint256 keyPrice,address oldTokenAddress,address tokenAddress)",
-        "event RefundPenaltyChanged (uint256 freeTrialLength,uint256 refundPenaltyBasisPoints)",
-        "event TimestampChanged (uint256 indexed _tokenId,uint256 _amount,bool _timeAdded)",
-        "event Transfer (address indexed from,address indexed to,uint256 indexed tokenId)",
-        "event TransferFeeChanged (uint256 transferFeeBasisPoints)",
-        "event Withdrawal (address indexed sender,address indexed tokenAddress,address indexed beneficiary,uint256 amount)",
-        "function BASIS_POINTS_DEN() constant view returns (uint256)",
-        "function CANCEL_TYPEHASH() constant view returns (bytes32)",
-        "function addLockManager(address account)",
-        "function approve(address _approved,uint256 _tokenId)",
-        "function balanceOf(address _owner) constant view returns (uint256)",
-        "function beneficiary() constant view returns (address)",
-        "function cancelAndRefund()",
-        "function cancelAndRefundFor(address _keyOwner,uint8 _v,bytes32 _r,bytes32 _s)",
-        "function destroyLock()",
-        "function disableLock()",
-        "function erc1820() constant view returns (address)",
-        "function expirationDuration() constant view returns (uint256)",
-        "function expireKeyFor(address _owner)",
-        "function freeTrialLength() constant view returns (uint256)",
-        "function fullRefund(address _keyOwner,uint256 amount)",
-        "function getApproved(uint256 _tokenId) constant view returns (address)",
-        "function getBalance(address _tokenAddress,address _account) constant view returns (uint256)",
-        "function getCancelAndRefundApprovalHash(address _keyOwner,address _txSender) constant view returns (bytes32 approvalHash)",
-        "function getCancelAndRefundValueFor(address _owner) constant view returns (uint256 refund)",
-        "function getHasValidKey(address _owner) constant view returns (bool)",
-        "function getOwnersByPage(uint256 _page,uint256 _pageSize) constant view returns (address[])",
-        "function getTokenIdFor(address _account) constant view returns (uint256)",
-        "function getTransferFee(address _owner,uint256 _time) constant view returns (uint256)",
-        "function grantKeys(address[] _recipients,uint256[] _expirationTimestamps)",
-        "function invalidateOffchainApproval(uint256 _nextAvailableNonce)",
-        "function isAlive() constant view returns (bool)",
-        "function isApprovedForAll(address _owner,address _operator) constant view returns (bool)",
-        "function isKeyOwner(uint256 _tokenId,address _owner) constant view returns (bool)",
-        "function isLockManager(address account) constant view returns (bool)",
-        "function isOwner() constant view returns (bool)",
-        "function keyCancelInterfaceId() constant view returns (bytes32)",
-        "function keyExpirationTimestampFor(address _owner) constant view returns (uint256 timestamp)",
-        "function keyOwnerToNonce(address) constant view returns (uint256)",
-        "function keyPrice() constant view returns (uint256)",
-        "function keySoldInterfaceId() constant view returns (bytes32)",
-        "function maxNumberOfKeys() constant view returns (uint256)",
-        "function name() constant view returns (string)",
-        "function numberOfOwners() constant view returns (uint256)",
-        "function owner() constant view returns (address)",
-        "function ownerOf(uint256 _tokenId) constant view returns (address)",
-        "function owners(uint256) constant view returns (address)",
-        "function publicLockVersion() constant pure returns (uint256)",
-        "function purchase(uint256 _value,address _recipient,address _referrer,bytes _data) payable",
-        "function refundPenaltyBasisPoints() constant view returns (uint256)",
-        "function renounceLockManager()",
-        "function renounceOwnership()",
-        "function safeTransferFrom(address _from,address _to,uint256 _tokenId)",
-        "function safeTransferFrom(address _from,address _to,uint256 _tokenId,bytes _data)",
-        "function setApprovalForAll(address _to,bool _approved)",
-        "function setBaseTokenURI(string _baseTokenURI)",
-        "function shareKey(address _to,uint256 _tokenId,uint256 _timeShared)",
-        "function supportsInterface(bytes4 interfaceId) constant view returns (bool)",
-        "function symbol() constant view returns (string)",
-        "function tokenAddress() constant view returns (address)",
-        "function tokenByIndex(uint256 _index) constant view returns (uint256)",
-        "function tokenOfOwnerByIndex(address _owner,uint256 _index) constant view returns (uint256)",
-        "function tokenURI(uint256 _tokenId) constant view returns (string)",
-        "function totalSupply() constant view returns (uint256)",
-        "function transferFeeBasisPoints() constant view returns (uint256)",
-        "function transferFrom(address _from,address _recipient,uint256 _tokenId)",
-        "function transferOwnership(address newOwner)",
-        "function unlockProtocol() constant view returns (address)",
-        "function updateBeneficiary(address _beneficiary)",
-        "function updateKeyPricing(uint256 _keyPrice,address _tokenAddress)",
-        "function updateLockName(string _lockName)",
-        "function updateLockSymbol(string _lockSymbol)",
-        "function updateRefundPenalty(uint256 _freeTrialLength,uint256 _refundPenaltyBasisPoints)",
-        "function updateTransferFee(uint256 _transferFeeBasisPoints)",
-        "function withdraw(address _tokenAddress,uint256 _amount)",
-        "function initialize(address _owner,uint256 _expirationDuration,address _tokenAddress,uint256 _keyPrice,uint256 _maxNumberOfKeys,string _lockName)",
-        "function initialize()",
-        "function initialize(address sender)"
-      ],
-      "bytecodeHash": "0x39260d0911736892b9a71a2c6b5fc69a98c58d297f8c4ca0bd7ee96c54244c69"
-    },
-    "v7": {
-      "contractName": "PublicLock",
-      "abi": [
-        "event Approval (address indexed owner,address indexed approved,uint256 indexed tokenId)",
-        "event ApprovalForAll (address indexed owner,address indexed operator,bool approved)",
-        "event CancelKey (uint256 indexed tokenId,address indexed owner,address indexed sendTo,uint256 refund)",
-        "event Disable ()",
-        "event ExpirationChanged (uint256 indexed _tokenId,uint256 _amount,bool _timeAdded)",
-        "event ExpireKey (uint256 indexed tokenId)",
-        "event KeyGranterAdded (address indexed account)",
-        "event KeyGranterRemoved (address indexed account)",
-        "event KeyManagerChanged (uint256 indexed _tokenId,address indexed _newManager)",
-        "event LockManagerAdded (address indexed account)",
-        "event LockManagerRemoved (address indexed account)",
-        "event NewLockSymbol (string symbol)",
-        "event NonceChanged (address indexed keyManager,uint256 nextAvailableNonce)",
-        "event PricingChanged (uint256 oldKeyPrice,uint256 keyPrice,address oldTokenAddress,address tokenAddress)",
-        "event RefundPenaltyChanged (uint256 freeTrialLength,uint256 refundPenaltyBasisPoints)",
-        "event RenewKeyPurchase (address indexed owner,uint256 newExpiration)",
-        "event Transfer (address indexed from,address indexed to,uint256 indexed tokenId)",
-        "event TransferFeeChanged (uint256 transferFeeBasisPoints)",
-        "event Withdrawal (address indexed sender,address indexed tokenAddress,address indexed beneficiary,uint256 amount)",
-        "function addKeyGranter(address account)",
-        "function addLockManager(address account)",
-        "function approve(address _approved,uint256 _tokenId)",
-        "function balanceOf(address _keyOwner) constant view returns (uint256)",
-        "function beneficiary() constant view returns (address)",
-        "function cancelAndRefund(uint256 _tokenId)",
-        "function cancelAndRefundFor(address _keyManager,uint8 _v,bytes32 _r,bytes32 _s,uint256 _tokenId)",
-        "function disableLock()",
-        "function expirationDuration() constant view returns (uint256)",
-        "function expireAndRefundFor(address _keyOwner,uint256 amount)",
-        "function freeTrialLength() constant view returns (uint256)",
-        "function getApproved(uint256 _tokenId) constant view returns (address)",
-        "function getBalance(address _tokenAddress,address _account) constant view returns (uint256)",
-        "function getCancelAndRefundApprovalHash(address _keyManager,address _txSender) constant view returns (bytes32 approvalHash)",
-        "function getCancelAndRefundValueFor(address _keyOwner) constant view returns (uint256 refund)",
-        "function getHasValidKey(address _keyOwner) constant view returns (bool)",
-        "function getOwnersByPage(uint256 _page,uint256 _pageSize) constant view returns (address[])",
-        "function getTokenIdFor(address _account) constant view returns (uint256)",
-        "function getTransferFee(address _keyOwner,uint256 _time) constant view returns (uint256)",
-        "function grantKeys(address[] _recipients,uint256[] _expirationTimestamps,address[] _keyManagers)",
-        "function invalidateOffchainApproval(uint256 _nextAvailableNonce)",
-        "function isAlive() constant view returns (bool)",
-        "function isApprovedForAll(address _owner,address _operator) constant view returns (bool)",
-        "function isKeyGranter(address account) constant view returns (bool)",
-        "function isKeyOwner(uint256 _tokenId,address _keyOwner) constant view returns (bool)",
-        "function isLockManager(address account) constant view returns (bool)",
-        "function keyExpirationTimestampFor(address _keyOwner) constant view returns (uint256)",
-        "function keyManagerOf(uint256) constant view returns (address)",
-        "function keyManagerToNonce(address) constant view returns (uint256)",
-        "function keyPrice() constant view returns (uint256)",
-        "function maxNumberOfKeys() constant view returns (uint256)",
-        "function name() constant view returns (string)",
-        "function numberOfOwners() constant view returns (uint256)",
-        "function onKeyCancelHook() constant view returns (address)",
-        "function onKeyPurchaseHook() constant view returns (address)",
-        "function ownerOf(uint256 _tokenId) constant view returns (address)",
-        "function owners(uint256) constant view returns (address)",
-        "function publicLockVersion() constant pure returns (uint256)",
-        "function purchase(uint256 _value,address _recipient,address _referrer,bytes _data) payable",
-        "function purchasePriceFor(address _recipient,address _referrer,bytes _data) constant view returns (uint256 minKeyPrice)",
-        "function refundPenaltyBasisPoints() constant view returns (uint256)",
-        "function renounceLockManager()",
-        "function revokeKeyGranter(address _granter)",
-        "function safeTransferFrom(address _from,address _to,uint256 _tokenId)",
-        "function safeTransferFrom(address _from,address _to,uint256 _tokenId,bytes _data)",
-        "function setApprovalForAll(address _to,bool _approved)",
-        "function setBaseTokenURI(string _baseTokenURI)",
-        "function setEventHooks(address _onKeyPurchaseHook,address _onKeyCancelHook)",
-        "function setKeyManagerOf(uint256 _tokenId,address _keyManager)",
-        "function shareKey(address _to,uint256 _tokenId,uint256 _timeShared)",
-        "function supportsInterface(bytes4 interfaceId) constant view returns (bool)",
-        "function symbol() constant view returns (string)",
-        "function tokenAddress() constant view returns (address)",
-        "function tokenByIndex(uint256 _index) constant view returns (uint256)",
-        "function tokenOfOwnerByIndex(address _keyOwner,uint256 _index) constant view returns (uint256)",
-        "function tokenURI(uint256 _tokenId) constant view returns (string)",
-        "function totalSupply() constant view returns (uint256)",
-        "function transferFeeBasisPoints() constant view returns (uint256)",
-        "function transferFrom(address _from,address _recipient,uint256 _tokenId)",
-        "function unlockProtocol() constant view returns (address)",
-        "function updateBeneficiary(address _beneficiary)",
-        "function updateKeyPricing(uint256 _keyPrice,address _tokenAddress)",
-        "function updateLockName(string _lockName)",
-        "function updateLockSymbol(string _lockSymbol)",
-        "function updateRefundPenalty(uint256 _freeTrialLength,uint256 _refundPenaltyBasisPoints)",
-        "function updateTransferFee(uint256 _transferFeeBasisPoints)",
-        "function withdraw(address _tokenAddress,uint256 _amount)",
-        "function initialize(address _lockCreator,uint256 _expirationDuration,address _tokenAddress,uint256 _keyPrice,uint256 _maxNumberOfKeys,string _lockName)",
-        "function initialize()"
-      ],
-      "bytecodeHash": "0xd66a672853995b93eff7fc1ea6eb09bac55fb58da34a8132703844b6b0837c32"
-    },
-    "v8": {
-      "contractName": "PublicLock",
-      "abi": [
-        "event Approval (address indexed owner,address indexed approved,uint256 indexed tokenId)",
-        "event ApprovalForAll (address indexed owner,address indexed operator,bool approved)",
-        "event CancelKey (uint256 indexed tokenId,address indexed owner,address indexed sendTo,uint256 refund)",
-        "event Disable ()",
-        "event ExpirationChanged (uint256 indexed _tokenId,uint256 _amount,bool _timeAdded)",
-        "event ExpireKey (uint256 indexed tokenId)",
-        "event KeyGranterAdded (address indexed account)",
-        "event KeyGranterRemoved (address indexed account)",
-        "event KeyManagerChanged (uint256 indexed _tokenId,address indexed _newManager)",
-        "event LockManagerAdded (address indexed account)",
-        "event LockManagerRemoved (address indexed account)",
-        "event NewLockSymbol (string symbol)",
-        "event NonceChanged (address indexed keyManager,uint256 nextAvailableNonce)",
-        "event PricingChanged (uint256 oldKeyPrice,uint256 keyPrice,address oldTokenAddress,address tokenAddress)",
-        "event RefundPenaltyChanged (uint256 freeTrialLength,uint256 refundPenaltyBasisPoints)",
-        "event RenewKeyPurchase (address indexed owner,uint256 newExpiration)",
-        "event Transfer (address indexed from,address indexed to,uint256 indexed tokenId)",
-        "event TransferFeeChanged (uint256 transferFeeBasisPoints)",
-        "event Withdrawal (address indexed sender,address indexed tokenAddress,address indexed beneficiary,uint256 amount)",
-        "function addKeyGranter(address account)",
-        "function addLockManager(address account)",
-        "function approve(address _approved,uint256 _tokenId)",
-        "function approveBeneficiary(address _spender,uint256 _amount) returns (bool)",
-        "function balanceOf(address _keyOwner) constant view returns (uint256)",
-        "function beneficiary() constant view returns (address)",
-        "function cancelAndRefund(uint256 _tokenId)",
-        "function cancelAndRefundFor(address _keyManager,uint8 _v,bytes32 _r,bytes32 _s,uint256 _tokenId)",
-        "function disableLock()",
-        "function expirationDuration() constant view returns (uint256)",
-        "function expireAndRefundFor(address _keyOwner,uint256 amount)",
-        "function freeTrialLength() constant view returns (uint256)",
-        "function getApproved(uint256 _tokenId) constant view returns (address)",
-        "function getBalance(address _tokenAddress,address _account) constant view returns (uint256)",
-        "function getCancelAndRefundApprovalHash(address _keyManager,address _txSender) constant view returns (bytes32 approvalHash)",
-        "function getCancelAndRefundValueFor(address _keyOwner) constant view returns (uint256 refund)",
-        "function getHasValidKey(address _keyOwner) constant view returns (bool)",
-        "function getOwnersByPage(uint256 _page,uint256 _pageSize) constant view returns (address[])",
-        "function getTokenIdFor(address _account) constant view returns (uint256)",
-        "function getTransferFee(address _keyOwner,uint256 _time) constant view returns (uint256)",
-        "function grantKeys(address[] _recipients,uint256[] _expirationTimestamps,address[] _keyManagers)",
-        "function invalidateOffchainApproval(uint256 _nextAvailableNonce)",
-        "function isAlive() constant view returns (bool)",
-        "function isApprovedForAll(address _owner,address _operator) constant view returns (bool)",
-        "function isKeyGranter(address account) constant view returns (bool)",
-        "function isKeyOwner(uint256 _tokenId,address _keyOwner) constant view returns (bool)",
-        "function isLockManager(address account) constant view returns (bool)",
-        "function keyExpirationTimestampFor(address _keyOwner) constant view returns (uint256)",
-        "function keyManagerOf(uint256) constant view returns (address)",
-        "function keyManagerToNonce(address) constant view returns (uint256)",
-        "function keyPrice() constant view returns (uint256)",
-        "function maxNumberOfKeys() constant view returns (uint256)",
-        "function name() constant view returns (string)",
-        "function numberOfOwners() constant view returns (uint256)",
-        "function onKeyCancelHook() constant view returns (address)",
-        "function onKeyPurchaseHook() constant view returns (address)",
-        "function ownerOf(uint256 _tokenId) constant view returns (address)",
-        "function owners(uint256) constant view returns (address)",
-        "function publicLockVersion() constant pure returns (uint256)",
-        "function purchase(uint256 _value,address _recipient,address _referrer,bytes _data) payable",
-        "function purchasePriceFor(address _recipient,address _referrer,bytes _data) constant view returns (uint256 minKeyPrice)",
-        "function refundPenaltyBasisPoints() constant view returns (uint256)",
-        "function renounceLockManager()",
-        "function revokeKeyGranter(address _granter)",
-        "function safeTransferFrom(address _from,address _to,uint256 _tokenId)",
-        "function safeTransferFrom(address _from,address _to,uint256 _tokenId,bytes _data)",
-        "function setApprovalForAll(address _to,bool _approved)",
-        "function setBaseTokenURI(string _baseTokenURI)",
-        "function setEventHooks(address _onKeyPurchaseHook,address _onKeyCancelHook)",
-        "function setKeyManagerOf(uint256 _tokenId,address _keyManager)",
-        "function shareKey(address _to,uint256 _tokenId,uint256 _timeShared)",
-        "function supportsInterface(bytes4 interfaceId) constant view returns (bool)",
-        "function symbol() constant view returns (string)",
-        "function tokenAddress() constant view returns (address)",
-        "function tokenByIndex(uint256 _index) constant view returns (uint256)",
-        "function tokenOfOwnerByIndex(address _keyOwner,uint256 _index) constant view returns (uint256)",
-        "function tokenURI(uint256 _tokenId) constant view returns (string)",
-        "function totalSupply() constant view returns (uint256)",
-        "function transfer(address _to,uint256 _value) returns (bool success)",
-        "function transferFeeBasisPoints() constant view returns (uint256)",
-        "function transferFrom(address _from,address _recipient,uint256 _tokenId)",
-        "function unlockProtocol() constant view returns (address)",
-        "function updateBeneficiary(address _beneficiary)",
-        "function updateKeyPricing(uint256 _keyPrice,address _tokenAddress)",
-        "function updateLockName(string _lockName)",
-        "function updateLockSymbol(string _lockSymbol)",
-        "function updateRefundPenalty(uint256 _freeTrialLength,uint256 _refundPenaltyBasisPoints)",
-        "function updateTransferFee(uint256 _transferFeeBasisPoints)",
-        "function withdraw(address _tokenAddress,uint256 _amount)",
-        "function initialize(address _lockCreator,uint256 _expirationDuration,address _tokenAddress,uint256 _keyPrice,uint256 _maxNumberOfKeys,string _lockName)",
-        "function initialize()"
-      ],
-      "bytecodeHash": "0x04782fb9f4650646c8db40744d69e4bf68845d1e7164884afb6ba95eb04e1a41"
-    },
     "v9": {
       "contractName": "PublicLock",
       "abi": [
@@ -1211,134 +840,6 @@ const abis = {
     }
   },
   "Unlock": {
-    "v4": {
-      "contractName": "Unlock",
-      "abi": [
-        "function locks(address) constant view returns (bool deployed,uint256 totalSales,uint256 yieldedDiscountTokens)",
-        "function renounceOwnership()",
-        "function owner() constant view returns (address)",
-        "function isOwner() constant view returns (bool)",
-        "function totalDiscountGranted() constant view returns (uint256)",
-        "function grossNetworkProduct() constant view returns (uint256)",
-        "function transferOwnership(address newOwner)",
-        "event NewLock (address indexed lockOwner,address indexed newLockAddress)",
-        "event NewTokenURI (string tokenURI)",
-        "event NewGlobalTokenSymbol (string tokenSymbol)",
-        "event OwnershipTransferred (address indexed previousOwner,address indexed newOwner)",
-        "function initialize(address _owner)",
-        "function createLock(uint256 _expirationDuration,address _tokenAddress,uint256 _keyPrice,uint256 _maxNumberOfKeys,string _lockName)",
-        "function computeAvailableDiscountFor(address _purchaser,uint256 _keyPrice) constant view returns (uint256 discount,uint256 tokens)",
-        "function recordKeyPurchase(uint256 _value,address _referrer)",
-        "function recordConsumedDiscount(uint256 _discount,uint256 _tokens)",
-        "function unlockVersion() constant pure returns (uint16)",
-        "function getGlobalBaseTokenURI() constant view returns (string)",
-        "function setGlobalBaseTokenURI(string _URI)",
-        "function getGlobalTokenSymbol() constant view returns (string)",
-        "function setGlobalTokenSymbol(string _symbol)"
-      ],
-      "bytecodeHash": "0xa1e7ddfa6d9183443aca067a96bd252f3ffa72a55ce36564ab77e79ce6527ac3"
-    },
-    "v6": {
-      "contractName": "Unlock",
-      "abi": [
-        "event ConfigUnlock (address publicLockAddress,string globalTokenSymbol,string globalTokenURI)",
-        "event NewLock (address indexed lockOwner,address indexed newLockAddress)",
-        "event OwnershipTransferred (address indexed previousOwner,address indexed newOwner)",
-        "event ResetTrackedValue (uint256 grossNetworkProduct,uint256 totalDiscountGranted)",
-        "function globalBaseTokenURI() constant view returns (string)",
-        "function globalTokenSymbol() constant view returns (string)",
-        "function grossNetworkProduct() constant view returns (uint256)",
-        "function isOwner() constant view returns (bool)",
-        "function locks(address) constant view returns (bool deployed,uint256 totalSales,uint256 yieldedDiscountTokens)",
-        "function owner() constant view returns (address)",
-        "function publicLockAddress() constant view returns (address)",
-        "function renounceOwnership()",
-        "function totalDiscountGranted() constant view returns (uint256)",
-        "function transferOwnership(address newOwner)",
-        "function uniswapExchanges(address) constant view returns (address)",
-        "function initialize(address _owner)",
-        "function createLock(uint256 _expirationDuration,address _tokenAddress,uint256 _keyPrice,uint256 _maxNumberOfKeys,string _lockName,bytes12 _salt)",
-        "function computeAvailableDiscountFor(address _purchaser,uint256 _keyPrice) constant view returns (uint256 discount,uint256 tokens)",
-        "function recordKeyPurchase(uint256 _value,address _referrer)",
-        "function recordConsumedDiscount(uint256 _discount,uint256 _tokens)",
-        "function unlockVersion() constant pure returns (uint16)",
-        "function configUnlock(address _publicLockAddress,string _symbol,string _URI)",
-        "function setExchange(address _tokenAddress,address _exchangeAddress)",
-        "function resetTrackedValue(uint256 _grossNetworkProduct,uint256 _totalDiscountGranted)"
-      ],
-      "bytecodeHash": "0x7b0e23742d9e4cbda29162687b753336c14d9afa6372385323f3a32a1365f535"
-    },
-    "v7": {
-      "contractName": "Unlock",
-      "abi": [
-        "event ConfigUnlock (string globalTokenSymbol,string globalTokenURI)",
-        "event NewLock (address indexed lockOwner,address indexed newLockAddress)",
-        "event OwnershipTransferred (address indexed previousOwner,address indexed newOwner)",
-        "event ResetTrackedValue (uint256 grossNetworkProduct,uint256 totalDiscountGranted)",
-        "event SetLockTemplate (address publicLockAddress)",
-        "function globalBaseTokenURI() constant view returns (string)",
-        "function globalTokenSymbol() constant view returns (string)",
-        "function grossNetworkProduct() constant view returns (uint256)",
-        "function isOwner() constant view returns (bool)",
-        "function locks(address) constant view returns (bool deployed,uint256 totalSales,uint256 yieldedDiscountTokens)",
-        "function owner() constant view returns (address)",
-        "function publicLockAddress() constant view returns (address)",
-        "function renounceOwnership()",
-        "function totalDiscountGranted() constant view returns (uint256)",
-        "function transferOwnership(address newOwner)",
-        "function uniswapExchanges(address) constant view returns (address)",
-        "function initialize(address _unlockOwner)",
-        "function createLock(uint256 _expirationDuration,address _tokenAddress,uint256 _keyPrice,uint256 _maxNumberOfKeys,string _lockName,bytes12 _salt)",
-        "function computeAvailableDiscountFor(address,uint256) constant view returns (uint256 discount,uint256 tokens)",
-        "function recordKeyPurchase(uint256 _value,address)",
-        "function recordConsumedDiscount(uint256 _discount,uint256)",
-        "function unlockVersion() constant pure returns (uint16)",
-        "function configUnlock(string _symbol,string _URI)",
-        "function setLockTemplate(address _publicLockAddress)",
-        "function setExchange(address _tokenAddress,address _exchangeAddress)",
-        "function resetTrackedValue(uint256 _grossNetworkProduct,uint256 _totalDiscountGranted)",
-        "function getGlobalBaseTokenURI() constant view returns (string)",
-        "function getGlobalTokenSymbol() constant view returns (string)"
-      ],
-      "bytecodeHash": "0x2f4767420e3b4affa1e3169450a565061cab422cdf7cd582179eb33b0480da0b"
-    },
-    "v8": {
-      "contractName": "Unlock",
-      "abi": [
-        "event ConfigUnlock (address udt,address weth,uint256 estimatedGasForPurchase,string globalTokenSymbol,string globalTokenURI)",
-        "event NewLock (address indexed lockOwner,address indexed newLockAddress)",
-        "event OwnershipTransferred (address indexed previousOwner,address indexed newOwner)",
-        "event ResetTrackedValue (uint256 grossNetworkProduct,uint256 totalDiscountGranted)",
-        "event SetLockTemplate (address publicLockAddress)",
-        "function estimatedGasForPurchase() constant view returns (uint256)",
-        "function globalBaseTokenURI() constant view returns (string)",
-        "function globalTokenSymbol() constant view returns (string)",
-        "function grossNetworkProduct() constant view returns (uint256)",
-        "function isOwner() constant view returns (bool)",
-        "function locks(address) constant view returns (bool deployed,uint256 totalSales,uint256 yieldedDiscountTokens)",
-        "function owner() constant view returns (address)",
-        "function publicLockAddress() constant view returns (address)",
-        "function renounceOwnership()",
-        "function totalDiscountGranted() constant view returns (uint256)",
-        "function transferOwnership(address newOwner)",
-        "function udt() constant view returns (address)",
-        "function uniswapOracles(address) constant view returns (address)",
-        "function weth() constant view returns (address)",
-        "function initialize(address _unlockOwner)",
-        "function createLock(uint256 _expirationDuration,address _tokenAddress,uint256 _keyPrice,uint256 _maxNumberOfKeys,string _lockName,bytes12 _salt)",
-        "function computeAvailableDiscountFor(address,uint256) constant view returns (uint256 discount,uint256 tokens)",
-        "function recordKeyPurchase(uint256 _value,address _referrer)",
-        "function recordConsumedDiscount(uint256 _discount,uint256)",
-        "function unlockVersion() constant pure returns (uint16)",
-        "function configUnlock(address _udt,address _weth,uint256 _estimatedGasForPurchase,string _symbol,string _URI)",
-        "function setLockTemplate(address _publicLockAddress)",
-        "function setOracle(address _tokenAddress,address _oracleAddress)",
-        "function resetTrackedValue(uint256 _grossNetworkProduct,uint256 _totalDiscountGranted)",
-        "function getGlobalBaseTokenURI() constant view returns (string)",
-        "function getGlobalTokenSymbol() constant view returns (string)"
-      ],
-      "bytecodeHash": "0xa757523ba876af736fe51084850937c0750049a724990558f1753fe9d0b0ec5e"
-    },
     "v9": {
       "contractName": "Unlock",
       "abi": [