diff --git a/.eslintignore b/.eslintignore
new file mode 100644
index 000000000..570fa1a5b
--- /dev/null
+++ b/.eslintignore
@@ -0,0 +1,3 @@
+build/
+node_modules/
+truffle.js
diff --git a/.eslintrc b/.eslintrc
new file mode 100644
index 000000000..fb4f23198
--- /dev/null
+++ b/.eslintrc
@@ -0,0 +1,62 @@
+{
+  "extends": ["standard", "plugin:promise/recommended"],
+  "plugins": ["mocha-no-only", "promise"],
+  "env": {
+    "browser": true,
+    "node": true,
+    "mocha": true,
+    "jest": true
+  },
+  "globals": {
+    "artifacts": false,
+    "contract": false,
+    "assert": false,
+    "web3": false
+  },
+  "rules": {
+    // Strict mode
+    "strict": ["error", "global"],
+
+    // Code style
+    "array-bracket-spacing": ["off"],
+    "camelcase": ["error", { "properties": "always" }],
+    "comma-dangle": ["error", "always-multiline"],
+    "comma-spacing": ["error", { "before": false, "after": true }],
+    "dot-notation": ["error", { "allowKeywords": true, "allowPattern": "" }],
+    "eol-last": ["error", "always"],
+    "eqeqeq": ["error", "smart"],
+    "generator-star-spacing": ["error", "before"],
+    "indent": ["error", 2],
+    "linebreak-style": ["error", "unix"],
+    "max-len": ["warn", 120, 2],
+    "no-debugger": "off",
+    "no-dupe-args": "error",
+    "no-dupe-keys": "error",
+    "no-mixed-spaces-and-tabs": ["error", "smart-tabs"],
+    "no-redeclare": ["error", { "builtinGlobals": true }],
+    "no-trailing-spaces": ["error", { "skipBlankLines": false }],
+    "no-undef": "error",
+    "no-use-before-define": "off",
+    "no-var": "error",
+    "object-curly-spacing": ["error", "always"],
+    "prefer-const": "error",
+    "quotes": ["error", "single"],
+    "semi": ["error", "never"],
+    "space-before-function-paren": [
+      "error",
+      {
+        "anonymous": "ignore",
+        "named": "ignore",
+        "asyncArrow": "ignore"
+      }
+    ],
+
+    "mocha-no-only/mocha-no-only": ["error"],
+
+    "promise/always-return": "off",
+    "promise/avoid-new": "off"
+  },
+  "parserOptions": {
+    "ecmaVersion": 2018
+  }
+}
diff --git a/.travis.yml b/.travis.yml
index 669db5b80..6a03d91e5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -22,8 +22,8 @@ before_install:
   - npm install -g ganache-cli truffle@5.0.20
 
 install:
-  - npm install 
+  - npm install
 
 script:
-  - ganache-cli &
-  - truffle test
\ No newline at end of file
+  - ganache-cli -d -l 9900000 -i 9545 &
+  - truffle test
diff --git a/contracts/DisputeManager.sol b/contracts/DisputeManager.sol
new file mode 100644
index 000000000..fc6aee43e
--- /dev/null
+++ b/contracts/DisputeManager.sol
@@ -0,0 +1,450 @@
+pragma solidity ^0.5.2;
+
+/*
+ * @title Dispute management
+ * @notice Provides a way to align the incentives of  participants ensuring that Query Results are trustful.
+ */
+
+import "./Governed.sol";
+import "./GraphToken.sol";
+import "./Staking.sol";
+import "./bytes/BytesLib.sol";
+import "@openzeppelin/contracts/cryptography/ECDSA.sol";
+
+contract DisputeManager is Governed {
+    using BytesLib for bytes;
+    using ECDSA for bytes32;
+    using SafeMath for uint256;
+
+    // Disputes contain info neccessary for the Arbitrator to verify and resolve
+    struct Dispute {
+        bytes32 subgraphID;
+        address indexNode;
+        address fisherman;
+        uint256 depositAmount;
+    }
+
+    // -- Attestation --
+
+    // Store IPFS hash as 32 byte hash and 2 byte hash function
+    // Note: Not future proof against IPFS planned updates to support multihash, which would require a len field
+    // Note: hashFunction - 0x1220 is 'Qm', or SHA256 with 32 byte length
+    struct IpfsHash {
+        bytes32 hash;
+        uint16 hashFunction;
+    }
+
+    // Signed message sent from IndexNode in response to a request
+    // Note: Message is located at the given IPFS content address
+    struct Attestation {
+        // Content Identifier for request message sent from user to indexing node
+        IpfsHash requestCID;
+        // Content Identifier for signed response message from indexing node
+        IpfsHash responseCID;
+        // Amount of computational account units (gas) used to process query
+        uint256 gasUsed;
+        // Amount of data sent in the response
+        uint256 responseNumBytes;
+        // ECDSA vrs signature (using secp256k1)
+        uint8 v;
+        bytes32 r;
+        bytes32 s;
+    }
+
+    uint256 private constant ATTESTATION_SIZE_BYTES = 192;
+    uint256 private constant SIGNATURE_SIZE_BYTES = 65;
+
+    // -- EIP-712  --
+
+    bytes32 private constant DOMAIN_TYPE_HASH = keccak256(
+        "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
+    );
+    bytes32 private constant DOMAIN_NAME_HASH = keccak256("Graph Protocol");
+    bytes32 private constant DOMAIN_VERSION_HASH = keccak256("0.1");
+    bytes32 private constant ATTESTATION_TYPE_HASH = keccak256(
+        "Attestation(IpfsHash requestCID,IpfsHash responseCID,uint256 gasUsed,uint256 responseNumBytes)IpfsHash(bytes32 hash,uint16 hashFunction)"
+    );
+    // 1 - mainnet // TODO: EIP-1344 adds support for the Chain ID opcode
+    uint256 private constant CHAIN_ID = 1;
+    bytes32 private DOMAIN_SEPARATOR;
+
+    // 100% in parts per million
+    uint256 private constant MAX_PPM = 1000000;
+
+    // 1 basis point (0.01%) is 100 parts per million (PPM)
+    uint256 private constant BASIS_PT = 100;
+
+    // Disputes created by the Fisherman or other authorized entites
+    // @key <bytes32> _disputeID - Hash of readIndex data + disputer data
+    mapping(bytes32 => Dispute) public disputes;
+
+    // The arbitrator is solely in control of arbitrating disputes
+    address public arbitrator;
+
+    // Percent of stake to slash in successful dispute
+    // Parts per million. (Allows for 4 decimal points, 999,999 = 99.9999%)
+    uint256 public slashingPercent;
+
+    // Graph Token address
+    GraphToken public token;
+
+    // Staking contract used for slashing
+    Staking public staking;
+
+    // -- Events --
+
+    event DisputeCreated(
+        bytes32 disputeID,
+        bytes32 indexed subgraphID,
+        address indexed indexNode,
+        address indexed fisherman,
+        bytes attestation
+    );
+
+    event DisputeAccepted(
+        bytes32 disputeID,
+        bytes32 indexed subgraphID,
+        address indexed indexNode,
+        address indexed fisherman,
+        uint256 amount
+    );
+
+    event DisputeRejected(
+        bytes32 disputeID,
+        bytes32 indexed subgraphID,
+        address indexed indexNode,
+        address indexed fisherman,
+        uint256 amount
+    );
+
+    event DisputeIgnored(
+        bytes32 disputeID,
+        bytes32 indexed subgraphID,
+        address indexed indexNode,
+        address indexed fisherman,
+        uint256 amount
+    );
+
+    modifier onlyArbitrator {
+        require(msg.sender == arbitrator, "Caller is not the Arbitrator");
+        _;
+    }
+
+    /**
+     * @dev Contract Constructor
+     * @param _governor <address> - Owner address of this contract
+     * @param _token <address> - Address of the Graph Protocol token
+     * @param _arbitrator <address> - Arbitrator role
+     * @param _staking <address> - Address of the staking contract used for slashing
+     * @param _slashingPercent <uint256> - Percent of stake the fisherman gets on slashing (in PPM)
+     */
+    constructor(
+        address _governor,
+        address _token,
+        address _arbitrator,
+        address _staking,
+        uint256 _slashingPercent
+    ) public Governed(_governor) {
+        _setArbitrator(_arbitrator);
+        token = GraphToken(_token);
+        staking = Staking(_staking);
+
+        slashingPercent = _slashingPercent;
+
+        // EIP-712 domain separator
+        DOMAIN_SEPARATOR = keccak256(
+            abi.encode(
+                DOMAIN_TYPE_HASH,
+                DOMAIN_NAME_HASH,
+                DOMAIN_VERSION_HASH,
+                CHAIN_ID,
+                address(this)
+            )
+        );
+    }
+
+    /**
+     * @dev Return whether a dispute exists or not
+     * @notice Return if dispute with ID `_disputeID` exists
+     * @param _disputeID <bool> - True if dispute already exists
+     */
+    function isDisputeCreated(bytes32 _disputeID) public view returns (bool) {
+        return disputes[_disputeID].fisherman != address(0);
+    }
+
+    /**
+     * @dev Get the amount of fisherman reward for a given amount of stake
+     * @notice Return the fisherman reward for a stake of `_value`
+     * @param _value <uint256> - Amount of validator's stake
+     * @return <uint256> - Percentage of validator's stake to be considered a reward
+     */
+    function getRewardForStake(uint256 _value) public view returns (uint256) {
+        return slashingPercent.mul(_value).div(MAX_PPM); // slashingPercent is in PPM
+    }
+
+    /**
+     * @dev Get the hash of encoded message to use as disputeID
+     * @notice Return the disputeID for a particular attestation
+     * @param _attestation <Attestation> - Signed Attestation message
+     * @return <bytes32> - Hash of encoded message used as disputeID
+     */
+    function getDisputeID(bytes memory _attestation)
+        public
+        view
+        returns (bytes32)
+    {
+        // TODO: add a nonce?
+        return
+            keccak256(
+                abi.encodePacked(
+                    "\x19\x01", // EIP-191 encoding pad, EIP-712 version 1
+                    DOMAIN_SEPARATOR,
+                    keccak256(
+                        abi.encode(ATTESTATION_TYPE_HASH, _attestation) // EIP 712-encoded message hash
+                    )
+                )
+            );
+    }
+
+    /**
+     * @dev Set the arbitrator address
+     * @notice Update the arbitrator to `_arbitrator`
+     * @param _arbitrator <address> - The address of the arbitration contract or party
+     */
+    function setArbitrator(address _arbitrator) external onlyGovernance {
+        _setArbitrator(_arbitrator);
+    }
+
+    /**
+     * @dev Set the arbitrator address
+     * @notice Update the arbitrator to `_arbitrator`
+     * @param _arbitrator <address> - The address of the arbitration contract or party
+     */
+    function _setArbitrator(address _arbitrator) private {
+        require(
+            _arbitrator != address(0),
+            "Cannot set arbitrator to empty address"
+        );
+        arbitrator = _arbitrator;
+    }
+
+    /**
+     * @dev Set the percent that the fisherman gets when slashing occurs
+     * @notice Update the slashing percent to `_slashingPercent`
+     * @param _slashingPercent <uint256> - Slashing percent
+     */
+    function setSlashingPercent(uint256 _slashingPercent)
+        external
+        onlyGovernance
+    {
+        // Slashing Percent must be within 0% to 100% (inclusive)
+        require(
+            _slashingPercent >= 0,
+            "Slashing percent must above or equal to 0"
+        );
+        require(
+            _slashingPercent <= MAX_PPM,
+            "Slashing percent must be below or equal to MAX_PPM"
+        );
+
+        slashingPercent = _slashingPercent;
+    }
+
+    /**
+     * @dev Accept tokens
+     * @notice Receive Graph tokens
+     * @param _from <address> - Token holder's address
+     * @param _value <uint256> - Amount of Graph Tokens
+     * @param _data <bytes> - Extra data payload
+     */
+    function tokensReceived(address _from, uint256 _value, bytes calldata _data)
+        external
+        returns (bool)
+    {
+        // Make sure the token is the caller of this function
+        require(
+            msg.sender == address(token),
+            "Caller is not the GRT token contract"
+        );
+
+        // Decode subgraphID
+        bytes32 _subgraphID = _data.slice(0, 32).toBytes32(0);
+
+        // Decode attestation
+        bytes memory _attestation = _data.slice(32, ATTESTATION_SIZE_BYTES);
+        require(
+            _attestation.length == ATTESTATION_SIZE_BYTES,
+            "Signature must be 192 bytes long"
+        );
+
+        // Decode attestation signature
+        bytes memory _sig = _data.slice(
+            32 + ATTESTATION_SIZE_BYTES,
+            SIGNATURE_SIZE_BYTES
+        );
+        require(
+            _sig.length == SIGNATURE_SIZE_BYTES,
+            "Signature must be 65 bytes long"
+        );
+
+        createDispute(_attestation, _sig, _subgraphID, _from, _value);
+
+        return true;
+    }
+
+    /**
+     * @dev The arbitrator can accept a dispute as being valid
+     * @notice Accept a dispute with ID `_disputeID`
+     * @param _disputeID <bytes32> - ID of the dispute to be accepted
+     */
+    function acceptDispute(bytes32 _disputeID) external onlyArbitrator {
+        require(isDisputeCreated(_disputeID), "Dispute does not exist");
+
+        Dispute memory dispute = disputes[_disputeID];
+
+        // Resolve dispute
+        delete disputes[_disputeID]; // Re-entrancy protection
+
+        // Have staking slash the index node and reward the fisherman
+        // Give the fisherman a reward equal to the slashingPercent of the indexer's stake
+        uint256 _stake = staking.getIndexingNodeStake(
+            dispute.subgraphID,
+            dispute.indexNode
+        );
+        uint256 _reward = getRewardForStake(_stake);
+        assert(_reward <= _stake); // sanity check on fixed-point math
+        staking.slash(
+            dispute.subgraphID,
+            dispute.indexNode,
+            _reward,
+            dispute.fisherman
+        );
+
+        // Give the fisherman their deposit back
+        require(
+            token.transfer(dispute.fisherman, dispute.depositAmount),
+            "Error sending dispute deposit"
+        );
+
+        // Log event that we awarded _fisherman _reward in resolving _disputeID
+        emit DisputeAccepted(
+            _disputeID,
+            dispute.subgraphID,
+            dispute.indexNode,
+            dispute.fisherman,
+            _reward
+        );
+    }
+
+    /**
+     * @dev The arbitrator can reject a dispute as being invalid
+     * @notice Reject a dispute with ID `_disputeID`
+     * @param _disputeID <bytes32> - ID of the dispute to be rejected
+     */
+    function rejectDispute(bytes32 _disputeID) external onlyArbitrator {
+        require(isDisputeCreated(_disputeID), "Dispute does not exist");
+
+        Dispute memory dispute = disputes[_disputeID];
+
+        // Resolve dispute
+        delete disputes[_disputeID]; // Re-entrancy protection
+
+        // Burn the fisherman's deposit
+        token.burn(dispute.depositAmount);
+
+        emit DisputeRejected(
+            _disputeID,
+            dispute.subgraphID,
+            dispute.indexNode,
+            dispute.fisherman,
+            dispute.depositAmount
+        );
+    }
+
+    /**
+     * @dev The arbitrator can disregard a dispute
+     * @notice Ignore a dispute with ID `_disputeID`
+     * @param _disputeID <bytes32> - ID of the dispute to be disregarded
+     */
+    function ignoreDispute(bytes32 _disputeID) external onlyArbitrator {
+        require(isDisputeCreated(_disputeID), "Dispute does not exist");
+
+        Dispute memory dispute = disputes[_disputeID];
+
+        // Resolve dispute
+        delete disputes[_disputeID]; // Re-entrancy protection
+
+        // Return deposit to the fisherman
+        require(
+            token.transfer(dispute.fisherman, dispute.depositAmount),
+            "Error sending dispute deposit"
+        );
+
+        emit DisputeIgnored(
+            _disputeID,
+            dispute.subgraphID,
+            dispute.indexNode,
+            dispute.fisherman,
+            dispute.depositAmount
+        );
+    }
+
+    /**
+     * @dev Create a dispute for the arbitrator to resolve
+     * @param _attestation <Attestation> - Attestation message
+     * @param _sig <bytes> - Attestation signature
+     * @param _subgraphID <bytes32> - subgraphID that Attestation message
+     *                                contains (in request raw object at CID)
+     * @param _fisherman <address> - Creator of dispute
+     * @param _amount <uint256> - Amount of tokens staked
+     */
+    function createDispute(
+        bytes memory _attestation,
+        bytes memory _sig,
+        bytes32 _subgraphID,
+        address _fisherman,
+        uint256 _amount
+    ) private {
+        // Obtain the hash of the fully-encoded message, per EIP-712 encoding
+        bytes32 _disputeID = getDisputeID(_attestation);
+
+        // Obtain the signer of the fully-encoded EIP-712 message hash
+        // Note: The signer of the attestation is the indexNode that served it
+        address _indexNode = _disputeID.recover(_sig);
+
+        // Get staked amount on the served subgraph by indexer
+        uint256 _stake = staking.getIndexingNodeStake(_subgraphID, _indexNode);
+
+        // This also validates that indexer node exists
+        require(
+            _stake > 0,
+            "Dispute has no stake on the subgraph by the indexer node"
+        );
+
+        // Ensure that fisherman has posted at least that amount
+        require(
+            _amount >= getRewardForStake(_stake),
+            "Dispute deposit under minimum required"
+        );
+
+        // A fisherman can only open one dispute for a given index node / subgraphID at a time
+        require(!isDisputeCreated(_disputeID), "Dispute already created"); // Must be empty
+
+        // Store dispute
+        disputes[_disputeID] = Dispute(
+            _subgraphID,
+            _indexNode,
+            _fisherman,
+            _amount
+        );
+
+        // Log event that new dispute was created against IndexNode
+        emit DisputeCreated(
+            _disputeID,
+            _subgraphID,
+            _indexNode,
+            _fisherman,
+            _attestation
+        );
+    }
+}
diff --git a/contracts/GNS.sol b/contracts/GNS.sol
index 63f1a8611..905b27fac 100644
--- a/contracts/GNS.sol
+++ b/contracts/GNS.sol
@@ -5,40 +5,40 @@ import "./Governed.sol";
 
 contract GNS is Governed {
     /*
-    * @title Graph Name Service (GNS) contract
-    *
-    * @author Bryant Eisenbach
-    * @author Reuven Etzion
-    * @author Ashoka Finley
-    * @notice Contract Specification:
-    *
-    * Subgraph IDs : Subgraph definitions are immutable, even though the actual
-    * data ingested may grow -- each subgraph manifest is hashed in its IPLD
-    * canonical serialized form, to produce a unique Id. Nodes in the peer-to-peer
-    * network use this Id to communicate who is indexing and caching what data, as
-    * well as route queries through the network. The self-certifying nature of
-    * subgraph IDs also make them useful for providing attestations and filing disputes.
-    *
-    * Domains : Subgraph IDs can also be associated with a domain name in the Graph
-    * Name Service (GNS) to provide a mutable reference to a subgraph. This can be
-    * useful for writing more human readable queries, always querying the latest version
-    * of a subgraph, specifying relationships between subgraphs or mutably referencing a
-    * subgraph in smart contracts. A domain can be registered with registerDomain(),
-    * and can be considered as a top level domain, where subdomains can be registered
-    * under.
-    *
-    * Subdomains : An owner of a domain in the GNS may wish to deploy multiple subgraphs
-    * to a single domain, and have them exist in separate namespaces. Sub-domains enable
-    * this use case, and add an optional additional layer of namespacing beyond that
-    * already provided by the top level domains. Subdomains and Domains are both stored
-    * in the domains mapping under the hash of their strings.
-    *
-    * Account metadata and subgraph metadata : Data that doesn't need to be stored on
-    * chain, such as descriptions of subgraphs or account images are stored on IPFS.
-    * This data can be retrieved from the IPFS hashes that are emitted through the
-    * metadata events.
-    *
-    */
+     * @title Graph Name Service (GNS) contract
+     *
+     * @author Bryant Eisenbach
+     * @author Reuven Etzion
+     * @author Ashoka Finley
+     * @notice Contract Specification:
+     *
+     * Subgraph IDs : Subgraph definitions are immutable, even though the actual
+     * data ingested may grow -- each subgraph manifest is hashed in its IPLD
+     * canonical serialized form, to produce a unique Id. Nodes in the peer-to-peer
+     * network use this Id to communicate who is indexing and caching what data, as
+     * well as route queries through the network. The self-certifying nature of
+     * subgraph IDs also make them useful for providing attestations and filing disputes.
+     *
+     * Domains : Subgraph IDs can also be associated with a domain name in the Graph
+     * Name Service (GNS) to provide a mutable reference to a subgraph. This can be
+     * useful for writing more human readable queries, always querying the latest version
+     * of a subgraph, specifying relationships between subgraphs or mutably referencing a
+     * subgraph in smart contracts. A domain can be registered with registerDomain(),
+     * and can be considered as a top level domain, where subdomains can be registered
+     * under.
+     *
+     * Subdomains : An owner of a domain in the GNS may wish to deploy multiple subgraphs
+     * to a single domain, and have them exist in separate namespaces. Sub-domains enable
+     * this use case, and add an optional additional layer of namespacing beyond that
+     * already provided by the top level domains. Subdomains and Domains are both stored
+     * in the domains mapping under the hash of their strings.
+     *
+     * Account metadata and subgraph metadata : Data that doesn't need to be stored on
+     * chain, such as descriptions of subgraphs or account images are stored on IPFS.
+     * This data can be retrieved from the IPFS hashes that are emitted through the
+     * metadata events.
+     *
+     */
 
     /* Events */
     event DomainAdded(
@@ -119,7 +119,7 @@ contract GNS is Governed {
      * @param _subdomainName <string> - Name of the Subdomain. If you were
      * registering 'david.thegraph', _subdomainName would be just 'david'.
      * @param _ipfsHash <bytes32> - Hash of the subgraph metadata, such as description.
-    */
+     */
     function createSubgraph(
         bytes32 _topLevelDomainHash,
         string calldata _subdomainName,
@@ -220,12 +220,12 @@ contract GNS is Governed {
     }
 
     /*
-    * @notice Change or initalize the Account Metadata, which is stored in a schema on IPFS.
-    * @dev Only the msg.sender can do this.
-    *
-    * @param _ipfsHash <bytes32> - Hash of the IPFS file that stores the subgraph metadata.
-    * @param _domainHash <bytes32> - Hash of the domain name.
-    */
+     * @notice Change or initalize the Account Metadata, which is stored in a schema on IPFS.
+     * @dev Only the msg.sender can do this.
+     *
+     * @param _ipfsHash <bytes32> - Hash of the IPFS file that stores the subgraph metadata.
+     * @param _domainHash <bytes32> - Hash of the domain name.
+     */
     function changeSubgraphMetadata(bytes32 _domainHash, bytes32 _ipfsHash)
         public
         onlyDomainOwner(_domainHash)
diff --git a/contracts/Governed.sol b/contracts/Governed.sol
index 639d5d730..d3de03f99 100644
--- a/contracts/Governed.sol
+++ b/contracts/Governed.sol
@@ -3,26 +3,26 @@ pragma solidity ^0.5.2;
 
 contract Governed {
     /*
-    * @title Graph Contract Governance contract
-    *
-    * @author Bryant Eisenbach
-    * @author Reuven Etzion
-    *
-    * @notice Contract Specification:
-    *
-    * There are several parameters throughout this mechanism design which are set via a
-    * governance process. In the v1 specification, governance will consist of a small committee
-    * which enacts changes to the protocol via a multi-sig contract.
-    *
-    * Requirements ("Governed" contract):
-    * req 01 Multisig contract will own this contract
-    * req 02 Verify the Governed contracts can upgrade themselves to a new `governor`
-    *   (GovA owns contracts 1-5 and can transfer ownership of 1-5 to GovB)
-    * ...
-    * Version 2
-    * req 01 (V2) Change Mutli-sig to use a voting mechanism
-    *   - Majority of votes after N% of votes cast will trigger proposed actions
-    */
+     * @title Graph Contract Governance contract
+     *
+     * @author Bryant Eisenbach
+     * @author Reuven Etzion
+     *
+     * @notice Contract Specification:
+     *
+     * There are several parameters throughout this mechanism design which are set via a
+     * governance process. In the v1 specification, governance will consist of a small committee
+     * which enacts changes to the protocol via a multi-sig contract.
+     *
+     * Requirements ("Governed" contract):
+     * req 01 Multisig contract will own this contract
+     * req 02 Verify the Governed contracts can upgrade themselves to a new `governor`
+     *   (GovA owns contracts 1-5 and can transfer ownership of 1-5 to GovB)
+     * ...
+     * Version 2
+     * req 01 (V2) Change Mutli-sig to use a voting mechanism
+     *   - Majority of votes after N% of votes cast will trigger proposed actions
+     */
 
     address public governor;
 
@@ -37,7 +37,7 @@ contract Governed {
     }
 
     modifier onlyGovernance {
-        require(msg.sender == governor, "Only Governor can call.");
+        require(msg.sender == governor, "Only Governor can call");
         _;
     }
 
diff --git a/contracts/RewardsManager.sol b/contracts/RewardsManager.sol
index 6934538a9..5a068d0bb 100644
--- a/contracts/RewardsManager.sol
+++ b/contracts/RewardsManager.sol
@@ -5,36 +5,36 @@ import "./Governed.sol";
 
 contract RewardsManager is Governed {
     /*
-    * @title Graph Protocol Reward Manager contract
-    *
-    * @author Bryant Eisenbach
-    * @author Reuven Etzion
-    *
-    * @notice Contract Specification:
-    *
-    * The total monetary inflation rate of Graph Tokens, over a given inflation period
-    * (more on this later), is the sum of its two constituent components:
-    * inflationRate = curatorRewardRate + participationRewardRate
-    *
-    * As indicated in the formula above, inflation is used to reward curation of datasets
-    * and participation in the network.
-    *
-    * Participation Adjusted Inflation - In order to encourage Graph Token holders to
-    * participate in the network, the protocol implements a participation-adjusted inflation reward.
-    *
-    * Curator Inflation Reward - The curationRewardRate is defined as a percentage of the total
-    * Graph Token supply, and is set via governance. As with the participation reward, it is paid
-    * via inflation.
-    *
-    * Requirements ("Reward Manager" contract):
-    * req 01 Has the ability to mint tokens according to the reward rules specified in mechanism
-    *   design of technical specification.
-    * req 02 Governance contract can update parameters { curatorRewardRate, targetParticipationRate, yearlyInflationRate }
-    * req 03 claimRewards function
-    * req 04 uint256 for yearly inflation rate
-    * req 05 a mapping that records the usage in queries of each index chain ,
-    * which would look like mapping( indexChainID bytes32 -> queryAmount uint256)
-    */
+     * @title Graph Protocol Reward Manager contract
+     *
+     * @author Bryant Eisenbach
+     * @author Reuven Etzion
+     *
+     * @notice Contract Specification:
+     *
+     * The total monetary inflation rate of Graph Tokens, over a given inflation period
+     * (more on this later), is the sum of its two constituent components:
+     * inflationRate = curatorRewardRate + participationRewardRate
+     *
+     * As indicated in the formula above, inflation is used to reward curation of datasets
+     * and participation in the network.
+     *
+     * Participation Adjusted Inflation - In order to encourage Graph Token holders to
+     * participate in the network, the protocol implements a participation-adjusted inflation reward.
+     *
+     * Curator Inflation Reward - The curationRewardRate is defined as a percentage of the total
+     * Graph Token supply, and is set via governance. As with the participation reward, it is paid
+     * via inflation.
+     *
+     * Requirements ("Reward Manager" contract):
+     * req 01 Has the ability to mint tokens according to the reward rules specified in mechanism
+     *   design of technical specification.
+     * req 02 Governance contract can update parameters { curatorRewardRate, targetParticipationRate, yearlyInflationRate }
+     * req 03 claimRewards function
+     * req 04 uint256 for yearly inflation rate
+     * req 05 a mapping that records the usage in queries of each index chain ,
+     * which would look like mapping( indexChainID bytes32 -> queryAmount uint256)
+     */
 
     /* STATE VARIABLES */
     // Percentage of the total Graph Token supply
diff --git a/contracts/ServiceRegistry.sol b/contracts/ServiceRegistry.sol
index 9c67cca6e..950ffdc52 100644
--- a/contracts/ServiceRegistry.sol
+++ b/contracts/ServiceRegistry.sol
@@ -5,19 +5,19 @@ import "./Governed.sol";
 
 contract ServiceRegistry is Governed {
     /*
-    * @title Graph Protocol Service Registry contract
-    *
-    * @author Bryant Eisenbach
-    * @author Reuven Etzion
-    *
-    * @notice Contract Specification:
-    *
-    * Requirements ("Service Registry" contract):
-    * req 01 Maps Ethereum Addresses to URLs
-    * req 02 No other contracts depend on this, rather is consumed by users of The Graph.
-    * ...
-    * @question - Who sets registeredUrls? Staking? (need interface)
-    */
+     * @title Graph Protocol Service Registry contract
+     *
+     * @author Bryant Eisenbach
+     * @author Reuven Etzion
+     *
+     * @notice Contract Specification:
+     *
+     * Requirements ("Service Registry" contract):
+     * req 01 Maps Ethereum Addresses to URLs
+     * req 02 No other contracts depend on this, rather is consumed by users of The Graph.
+     * ...
+     * @question - Who sets registeredUrls? Staking? (need interface)
+     */
 
     /* EVENTS */
     event ServiceUrlSet(address indexed serviceProvider, string urlString);
diff --git a/contracts/Staking.sol b/contracts/Staking.sol
index 3edea0390..1e18f2aca 100644
--- a/contracts/Staking.sol
+++ b/contracts/Staking.sol
@@ -69,14 +69,13 @@ pragma solidity ^0.5.2;
  */
 
 /*
-*/
+ */
 
-import "./GraphToken.sol";
 import "./Governed.sol";
+import "./GraphToken.sol";
 import "./bytes/BytesLib.sol";
 import "./bancor/BancorFormula.sol";
 
-
 contract Staking is Governed, BancorFormula {
     using BytesLib for bytes;
 
@@ -114,29 +113,10 @@ contract Staking is Governed, BancorFormula {
         bytes32 subgraphID
     );
 
-    // @dev Dispute was created by fisherman
-    event DisputeCreated(
-        bytes32 indexed _subgraphId,
-        address indexed _indexingNode,
-        address indexed _fisherman,
-        bytes32 _disputeId,
-        bytes _attestation
-    );
-
-    // @dev Dispute was accepted, indexing node lost their stake
-    event DisputeAccepted(
-        bytes32 indexed _disputeId,
-        bytes32 indexed _subgraphId,
-        address indexed _indexingNode,
-        uint256 _amount
-    );
-
-    // @dev Dispute was rejected, fisherman lost the given bond amount
-    event DisputeRejected(
-        bytes32 indexed _disputeId,
-        bytes32 indexed _subgraphId,
-        address indexed _fisherman,
-        uint256 _amount
+    event SlasherUpdated(
+        address indexed caller,
+        address indexed slasher,
+        bool enabled
     );
 
     /* Structs */
@@ -160,54 +140,8 @@ contract Staking is Governed, BancorFormula {
         uint256 totalIndexers;
     }
 
-    // @dev Store IPFS hash as 32 byte hash and 2 byte hash function
-    struct IpfsHash {
-        bytes32 hash; // Note: Not future proof against IPFS planned updates to
-        //       support multihash, which would require a len field
-        uint16 hashFunction; // 0x1220 is 'Qm', or SHA256 with 32 byte length
-    }
-
-    // @dev signed message sent from Indexing Node in response to a request
-    struct Attestation {
-        // Content Identifier for request message sent from user to indexing node
-        IpfsHash requestCID; // Note: Message is located at the given IPFS content addr
-        // Content Identifier for signed response message from indexing node
-        IpfsHash responseCID; // Note: Message is located at the given IPFS content addr
-        // Amount of computational account units (gas) used to process query
-        uint256 gasUsed;
-        // Amount of data sent in the response
-        uint256 responseNumBytes;
-        // ECDSA vrs signature (using secp256k1)
-        uint8 v;
-        bytes32 r;
-        bytes32 s;
-    }
-    uint256 private constant ATTESTATION_SIZE_BYTES = 197;
-
-    // EIP-712 constants
-    bytes32 private constant DOMAIN_TYPE_HASH = keccak256(
-        "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract,bytes32 salt)"
-    );
-    bytes32 private constant ATTESTATION_TYPE_HASH = keccak256(
-        "Attestation(IpfsHash requestCID,IpfsHash responseCID,uint256 gasUsed,uint256 responseNumBytes)IpfsHash(bytes32 hash,uint16 hashFunction)"
-    );
-    bytes32 private constant DOMAIN_NAME_HASH = keccak256("Graph Protocol");
-    bytes32 private constant DOMAIN_VERSION_HASH = keccak256("0.1");
-
-    // TODO: EIP-1344 adds support for the Chain ID opcode
-    //       Use that instead
-    uint256 private constant CHAIN_ID = 1; // Mainnet
-
-    // @dev Disputes contain info neccessary for the arbitrator to verify and resolve
-    struct Dispute {
-        bytes32 subgraphId;
-        address indexingNode;
-        address fisherman;
-        uint256 depositAmount;
-    }
-
     /* ENUMS */
-    enum TokenReceiptAction { Staking, Curation, Dispute, Settlement }
+    enum TokenReceiptAction { Staking, Curation, Settlement }
 
     /* STATE VARIABLES */
     // Minimum amount allowed to be staked by Market Curators
@@ -232,10 +166,6 @@ contract Staking is Governed, BancorFormula {
     // Maximum number of Indexing Nodes staked higher than stake to consider
     uint256 public maximumIndexers;
 
-    // Percent of stake to slash in successful dispute
-    // @dev Parts per million. (Allows for 4 decimal points, 999,999 = 99.9999%)
-    uint256 public slashingPercent;
-
     // Amount of seconds to wait until indexer can finish stake logout
     // @dev Thawing Period allows disputes to be processed during logout
     uint256 public thawingPeriod;
@@ -265,30 +195,23 @@ contract Staking is Governed, BancorFormula {
     // Subgraphs mapping
     mapping(bytes32 => Subgraph) public subgraphs;
 
-    // @dev Disputes created by the Fisherman or other authorized entites
-    // @key <bytes32> _disputeId - Hash of readIndex data + disputer data
-    mapping(bytes32 => Dispute) private disputes;
+    // List of addresses allowed to slash
+    mapping(address => bool) public slashers;
 
-    // The arbitrator is solely in control of arbitrating disputes
-    address public arbitrator;
-
-    // Graph Token address
+    // Related contracts
     GraphToken public token;
 
-    /* MODIFIERS */
-    // Disputes management only can be settled by arbitrator
-    modifier onlyArbitrator {
-        require(msg.sender == arbitrator);
-        _;
-    }
-
-    /* CONSTANTS */
     // @dev 100% in parts per million.
     uint256 private constant MAX_PPM = 1000000;
 
     // @dev 1 basis point (0.01%) is 100 parts per million (PPM).
     uint256 private constant BASIS_PT = 100;
 
+    modifier onlySlasher {
+        require(slashers[msg.sender] == true, "Caller is not a Slasher");
+        _;
+    }
+
     /**
      * @dev Staking Contract Constructor
      * @param _governor <address> - Address of the multisig contract as Governor of this contract
@@ -300,7 +223,6 @@ contract Staking is Governed, BancorFormula {
         uint256 _defaultReserveRatio,
         uint256 _minimumIndexingStakingAmount,
         uint256 _maximumIndexers,
-        uint256 _slashingPercent,
         uint256 _thawingPeriod,
         address _token
     ) public Governed(_governor) {
@@ -309,12 +231,20 @@ contract Staking is Governed, BancorFormula {
         defaultReserveRatio = _defaultReserveRatio;
         minimumIndexingStakingAmount = _minimumIndexingStakingAmount; // @imp i03
         maximumIndexers = _maximumIndexers;
-        slashingPercent = _slashingPercent;
         thawingPeriod = _thawingPeriod;
-        arbitrator = governor;
         token = GraphToken(_token); // Question - do we need a function to upgrade this?
     }
 
+    function addSlasher(address _slasher) external onlyGovernance {
+        slashers[_slasher] = true;
+        emit SlasherUpdated(msg.sender, _slasher, true);
+    }
+
+    function removeSlasher(address _slasher) external onlyGovernance {
+        slashers[_slasher] = false;
+        emit SlasherUpdated(msg.sender, _slasher, false);
+    }
+
     /**
      * @dev Set the Minimum Staking Amount for Market Curators
      * @param _minimumCurationStakingAmount <uint256> - Minimum amount allowed to be staked
@@ -368,22 +298,6 @@ contract Staking is Governed, BancorFormula {
         return true;
     }
 
-    /**
-     * @dev Set the percent that the fisherman gets when slashing occurs
-     * @param _slashingPercent <uint256> - Slashing percent
-     */
-    function updateSlashingPercentage(uint256 _slashingPercent)
-        external
-        onlyGovernance
-        returns (bool success)
-    {
-        // Slashing Percent must be within 0% to 100% (inclusive)
-        require(_slashingPercent >= 0);
-        require(_slashingPercent <= MAX_PPM);
-        slashingPercent = _slashingPercent;
-        return true;
-    }
-
     /**
      * @dev Set the thawing period for indexer logout
      * @param _thawingPeriod <uint256> - Number of seconds for thawing period
@@ -391,23 +305,85 @@ contract Staking is Governed, BancorFormula {
     function updateThawingPeriod(uint256 _thawingPeriod)
         external
         onlyGovernance
-        returns (bool success)
     {
         thawingPeriod = _thawingPeriod;
-        return true;
     }
 
-    /**
-     * @dev Set the arbitrator address
-     * @param _arbitrator <address> - The address of the arbitration contract or party
-     */
-    function setArbitrator(address _arbitrator)
-        external
-        onlyGovernance
-        returns (bool success)
+    function removeGraphIndexingNode(address _indexingNode)
+        private
+        returns (bool)
     {
-        arbitrator = _arbitrator;
-        return true;
+        (bool found, uint256 userIndex) = findGraphIndexerIndex(_indexingNode);
+        if (found) {
+            delete graphIndexingNodeAddresses[userIndex];
+            return true;
+        }
+        return false;
+    }
+
+    function getIndexingNodeStake(bytes32 _subgraphId, address _indexingNode)
+        public
+        view
+        returns (uint256)
+    {
+        return indexingNodes[_subgraphId][_indexingNode].amountStaked;
+    }
+
+    function slash(
+        bytes32 _subgraphId,
+        address _indexingNode,
+        uint256 _reward,
+        address _beneficiary
+    ) external onlySlasher {
+        require(
+            _beneficiary != address(0),
+            "Beneficiary must not be an empty address"
+        );
+        require(_reward > 0, "Slashing reward must be greater than 0");
+
+        // Get indexer to be slashed
+        IndexingNode memory _slashedIndexingNode = indexingNodes[_subgraphId][_indexingNode];
+
+        // Remove indexer from the stakes
+        delete indexingNodes[_subgraphId][_indexingNode]; // Re-entrancy protection
+
+        // Indexer needs to exist and have stakes
+        require(
+            _slashedIndexingNode.amountStaked > 0,
+            "Indexer has no stake on the subgraph"
+        );
+
+        // Handle special case for bootstrap nodes
+        if (_subgraphId == graphSubgraphID) {
+            require(
+                removeGraphIndexingNode(_indexingNode),
+                "Bootstrap indexer not found"
+            );
+        }
+
+        // Remove Indexing Node for subgraph
+        subgraphs[_subgraphId].totalIndexingStake -= _slashedIndexingNode
+            .amountStaked;
+        subgraphs[_subgraphId].totalIndexers -= 1;
+
+        // Burn index node stake and fees setting apart a reward for the beneficiary
+        uint256 tokensToBurn = (_slashedIndexingNode.amountStaked - _reward) +
+            _slashedIndexingNode.feesAccrued;
+        token.burn(tokensToBurn);
+
+        // Give the beneficiary a reward for the slashing
+        require(
+            token.transfer(_beneficiary, _reward),
+            "Error sending dispute deposit"
+        );
+
+        emit IndexingNodeBeginLogout(
+            _indexingNode,
+            _subgraphId,
+            _slashedIndexingNode.amountStaked,
+            _slashedIndexingNode.feesAccrued
+        );
+        emit IndexingNodeFinalizeLogout(_indexingNode, _subgraphId);
     }
 
     /**
@@ -464,11 +440,6 @@ contract Staking is Governed, BancorFormula {
         } else if (option == TokenReceiptAction.Curation) {
             // @imp c01 Handle internal call for Curation Staking
             signalForCuration(_subgraphId, _from, _value);
-        } else if (option == TokenReceiptAction.Dispute) {
-            require(_data.length == 33 + ATTESTATION_SIZE_BYTES);
-            bytes memory _attestation = _data.slice(33, ATTESTATION_SIZE_BYTES);
-            // Inner call to createDispute
-            createDispute(_attestation, _subgraphId, _from, _value);
         } else if (option == TokenReceiptAction.Settlement) {
             require(_data.length >= 33 + 20);
             // Header + _indexingNode
@@ -746,192 +717,6 @@ contract Staking is Governed, BancorFormula {
         emit IndexingNodeFinalizeLogout(msg.sender, _subgraphId);
     }
 
-    /**
-     * @dev Get the amount of fisherman reward for a given amount of stake
-     * @param _value <uint256> - Amount of validator's stake
-     * @return <uint256> - Percentage of validator's stake to be considered a reward
-     */
-    function getRewardForValue(uint256 _value) public view returns (uint256) {
-        return (slashingPercent * _value) / MAX_PPM; // slashingPercent is in PPM
-    }
-
-    /**
-     * @dev Create a dispute for the arbitrator to resolve
-     * @param _attestation <Attestation> - Signed Attestation message
-     * @param _subgraphId <bytes32> - SubgraphId that Attestation message
-     *                                contains (in request raw object at CID)
-     * @param _fisherman <address> - Creator of dispute
-     * @param _amount <uint256> - Amount of tokens staked
-     * @notice Payable using Graph Tokens for deposit
-     */
-    function createDispute(
-        bytes memory _attestation,
-        bytes32 _subgraphId,
-        address _fisherman,
-        uint256 _amount
-    ) private {
-        // Obtain the hash of the fully-encoded message, per EIP-712 encoding
-        bytes32 _disputeId = keccak256(
-            abi.encode(
-                // HACK: Remove this line until eth_signTypedData is in common use
-                //"\x19\x01", // EIP-191 encoding pad, EIP-712 version 1
-                "\x19Ethereum Signed Message:\n",
-                64, // 64 bytes (2 hashes)
-                // END HACK
-                keccak256(
-                    abi.encode( // EIP 712 domain separator
-                        DOMAIN_TYPE_HASH,
-                        DOMAIN_NAME_HASH,
-                        DOMAIN_VERSION_HASH,
-                        CHAIN_ID, // (Change to block.chain_id after EIP-1344 support)
-                        this, // contract address
-                        // Application-specific domain separator
-                        // Ensures msgs for different subgraphs cannot be reused
-                        // Note: Not necessary when subgraphs are factory pattern because of contract address
-                        _subgraphId // EIP-712 Salt
-                    )
-                ),
-                keccak256(
-                    abi.encode( // EIP 712-encoded message hash
-                        ATTESTATION_TYPE_HASH,
-                        _attestation.slice(0, ATTESTATION_SIZE_BYTES - 65) // Everything except the signature
-                    )
-                )
-            )
-        );
-
-        // Decode the signature
-        (uint8 v, bytes32 r, bytes32 s) = abi.decode( // VRS signature components
-            _attestation.slice(ATTESTATION_SIZE_BYTES - 65, 65), // just the signature
-            (uint8, bytes32, bytes32) // V, R, and S
-        );
-
-        // Obtain the signer of the fully-encoded EIP-712 message hash
-        // Note: The signer of the attestation is the indexing node that served it
-        address _indexingNode = ecrecover(_disputeId, v, r, s);
-
-        uint256 _stake = indexingNodes[_subgraphId][_indexingNode].amountStaked;
-        require(_stake > 0); // This also validates that _indexingNode exists
-
-        // Ensure that fisherman has posted at least that amount
-        require(_amount >= getRewardForValue(_stake));
-        // NOTE: There is a potential for a front-running attack against a fisherman
-        //       by the indexing node if this were strictly equal to the amount of
-        //       reward that the fisherman were to expect. As a partial mitigation for
-        //       this, the fisherman can over-stake their bond. For every X amount that
-        //       the fisherman overstakes by, the staker would have to also up their
-        //       stake by the same proportion, and due to the reward being slasingPercent
-        //       of the total stake already, the amount the indexing node would have to
-        //       up their stake by would be a significant multiple of this increase.
-        //
-        //       As an example, if slashingPercent were 10%, and the indexer had staked
-        //       100 tokens, the minimum the fisherman would be required to stake is 10
-        //       tokens. If the fisherman staked 20 tokens instead on their dispute, the
-        //       indexing node would have to stake more than 100 tokens extra to front-
-        //       run their dispute and cancel it before it is created. This is a safety
-        //       factor of 10x for the fisherman. The smaller slashingPercent is, the
-        //       larger the multiple would be.
-        //
-        //       Due to this mechanic, this partial mitigation may be enough to defend
-        //       against this in practice until a better design is contructed that takes
-        //       this into account.
-
-        // A fisherman can only open one dispute with a given indexing node
-        // per subgraphId at a time
-        require(disputes[_disputeId].fisherman == address(0)); // Must be empty
-
-        // Store dispute
-        disputes[_disputeId] = Dispute(
-            _subgraphId,
-            _indexingNode,
-            _fisherman,
-            _amount
-        );
-
-        // Log event that new dispute was created against _indexingNode
-        emit DisputeCreated(
-            _subgraphId,
-            _indexingNode,
-            _fisherman,
-            _disputeId,
-            _attestation
-        );
-    }
-
-    /**
-     * @dev The arbitrator can verify a dispute as being valid.
-     * @param _disputeId <bytes32> - ID of the dispute to be verified
-     */
-    function verifyDispute(bytes32 _disputeId)
-        external
-        onlyArbitrator
-        returns (bool success)
-    {
-        // Input validation, read storage for later (when deleted)
-        uint256 _bond = disputes[_disputeId].depositAmount;
-        require(_bond > 0); // Ensure this is a valid dispute
-        address _fisherman = disputes[_disputeId].fisherman;
-        address _indexer = disputes[_disputeId].indexingNode;
-        bytes32 _subgraphId = disputes[_disputeId].subgraphId;
-        delete disputes[_disputeId]; // Re-entrancy protection
-
-        // Have staking slash the index node and reward the fisherman
-        // Give the fisherman a reward equal to the slashingPercent of the indexer's stake
-        uint256 _stake = indexingNodes[_subgraphId][_indexer].amountStaked;
-        uint256 _fees = indexingNodes[_subgraphId][_indexer].feesAccrued;
-        delete indexingNodes[_subgraphId][_indexer]; // Re-entrancy protection
-        assert(_stake > 0); // Ensure this is a valid staker (should always be true)
-        uint256 _reward = getRewardForValue(_stake);
-        assert(_reward <= _stake); // sanity check on fixed-point math
-
-        if (_subgraphId == graphSubgraphID) {
-            (bool found, uint256 userIndex) = findGraphIndexerIndex(_indexer);
-            assert(found == true);
-            delete graphIndexingNodeAddresses[userIndex];
-        }
-
-        // Remove Indexing Node from Subgraph's stakers
-        subgraphs[_subgraphId].totalIndexingStake -= _stake;
-        subgraphs[_subgraphId].totalIndexers -= 1;
-        emit IndexingNodeBeginLogout(_indexer, _subgraphId, _stake, _fees);
-        emit IndexingNodeFinalizeLogout(_indexer, _subgraphId);
-
-        // Give governance the difference between the fisherman's reward and the total stake
-        // plus the Indexing Node's accrued fees
-        token.transfer(governor, (_stake - _reward) + _fees); // TODO Burn or give to governance?
-
-        // Give the fisherman their reward and bond back
-        token.transfer(_fisherman, _reward + _bond);
-
-        // Log event that we awarded _fisherman _reward in resolving _disputeId
-        emit DisputeAccepted(_disputeId, _subgraphId, _indexer, _reward);
-        success = true;
-    }
-
-    /**
-     * @dev The arbitrator can reject a dispute as being invalid.
-     * @param _disputeId <bytes32> - ID of the dispute to be rejected
-     */
-    function rejectDispute(bytes32 _disputeId)
-        external
-        onlyArbitrator
-        returns (bool success)
-    {
-        // Input validation, read storage for later (when deleted)
-        uint256 _bond = disputes[_disputeId].depositAmount;
-        require(_bond > 0); // Ensure this is a valid dispute
-        address _fisherman = disputes[_disputeId].fisherman;
-        bytes32 _subgraphId = disputes[_disputeId].subgraphId;
-        delete disputes[_disputeId]; // Re-entrancy protection
-
-        // Slash the fisherman's bond and send to the governor
-        token.transfer(governor, _bond); // TODO Burn or give to governance?
-
-        // Log event that we slashed _fisherman for _bond in resolving _disputeId
-        emit DisputeRejected(_disputeId, _subgraphId, _fisherman, _bond);
-        success = true;
-    }
-
     /**
      * @dev Distribute the channel fees to the given Indexing Node and all the Curators
      *      for that subgraph. Curator fees are applied through reserve balance increase
diff --git a/graphProtocol.js b/graphProtocol.js
index 273c2074f..4ebcd62c5 100644
--- a/graphProtocol.js
+++ b/graphProtocol.js
@@ -23,12 +23,12 @@
 module.exports = (options = {}) => {
   // Destructure the options properties for our contract ABIs
   const {
-    DisputeManager,
-    GNS,
+    // DisputeManager,
+    // GNS,
     GraphToken,
     MultiSigWallet,
-    RewardsManager,
-    ServiceRegistry,
+    // RewardsManager,
+    // ServiceRegistry,
     Staking,
   } = options
 
@@ -118,12 +118,10 @@ module.exports = (options = {}) => {
      * @dev Getter for `arbitrator`
      * @returns {Number} Arbitrator
      */
-    static arbitrator() {
+    static getArbitrator() {
       return Staking.arbitrator()
     }
 
-
-
     /**
      * @dev Getter for `token` (deployed GraphToken contract address)
      * @returns {Address} Deployed Graph Token contract address
@@ -192,7 +190,7 @@ module.exports = (options = {}) => {
      */
     static async stakeForCuration(subgraphId, from, value) {
       // encode data to be used in staking for indexing
-      let data = '0x01' + subgraphId
+      const data = '0x01' + subgraphId
       return GraphToken.transferToTokenReceiver(
         Staking.address, // to
         value, // value
@@ -211,7 +209,7 @@ module.exports = (options = {}) => {
      */
     static async stakeForIndexing(subgraphId, from, value) {
       // encode data to be used in staking for indexing
-      let data = '0x00' + subgraphId
+      const data = '0x00' + subgraphId
       return GraphToken.transferToTokenReceiver(
         Staking.address, // to
         value, // value
@@ -226,10 +224,7 @@ module.exports = (options = {}) => {
      * @param from <address> - Address of staking indexing node
      */
     static beginLogout(subgraphId, from) {
-      return Staking.beginLogout(
-        subgraphId,
-        { from }
-      )
+      return Staking.beginLogout(subgraphId, { from })
     }
 
     /**
@@ -238,10 +233,7 @@ module.exports = (options = {}) => {
      * @param from <address> - Address of staking indexing node
      */
     static finalizeLogout(subgraphId, from) {
-      return Staking.finalizeLogout(
-        subgraphId,
-        { from }
-      )
+      return Staking.finalizeLogout(subgraphId, { from })
     }
 
     /**
@@ -275,4 +267,4 @@ module.exports = (options = {}) => {
     governance,
     staking,
   }
-}
\ No newline at end of file
+}
diff --git a/migrations/1_initial_migration.js b/migrations/1_initial_migration.js
index 6e0a9f15c..a7a4fdbc8 100644
--- a/migrations/1_initial_migration.js
+++ b/migrations/1_initial_migration.js
@@ -1,5 +1,5 @@
-var Migrations = artifacts.require("Migrations");
+const Migrations = artifacts.require('Migrations')
 
 module.exports = function(deployer) {
-  deployer.deploy(Migrations);
-};
+  deployer.deploy(Migrations)
+}
diff --git a/migrations/2_deploy_contracts.js b/migrations/2_deploy_contracts.js
index d157d5378..ba51761b5 100644
--- a/migrations/2_deploy_contracts.js
+++ b/migrations/2_deploy_contracts.js
@@ -10,32 +10,44 @@ const BN = web3.utils.BN
 /**
  * @dev Parameters used in deploying the contracts.
  */
-const initialSupply = new BN("10000000000000000000000000"), // 10,000,000 * 10^18  total supply of Graph Tokens at time of deployment
-  minimumCurationStakingAmount = new BN("100000000000000000000"), // 100 * 10^18 minimum amount allowed to be staked by Market Curators
-  defaultReserveRatio = 500000, // reserve ratio (percent as PPM)
-  minimumIndexingStakingAmount = new BN("100000000000000000000"), // 100 * 10^18 minimum amount allowed to be staked by Indexing Nodes
-  maximumIndexers = 10, // maximum number of Indexing Nodes staked higher than stake to consider
-  slashingPercent = 10, // percent of stake to slash in successful dispute
-  thawingPeriod = 60 * 60 * 24 * 7, // amount of seconds to wait until indexer can finish stake logout
-  multiSigRequiredVote = 0, // votes required (setting a required amount here will override a formula used later)
-  multiSigOwners = [] // add addresses of the owners of the multisig contract here
 
-let deployed = {} // store deployed contracts in a JSON object
+// 10,000,000 * 10^18  total supply of Graph Tokens at time of deployment
+const initialSupply = new BN('10000000000000000000000000')
+// 100 * 10^18 minimum amount allowed to be staked by Market Curators
+const minimumCurationStakingAmount = new BN('100000000000000000000')
+// reserve ratio (percent as PPM)
+const defaultReserveRatio = 500000
+// 100 * 10^18 minimum amount allowed to be staked by Indexing Nodes
+const minimumIndexingStakingAmount = new BN('100000000000000000000')
+// maximum number of Indexing Nodes staked higher than stake to consider
+const maximumIndexers = 10
+// percent of stake to slash in successful dispute
+// const slashingPercent = 10
+// amount of seconds to wait until indexer can finish stake logout
+const thawingPeriod = 60 * 60 * 24 * 7
+// votes required (setting a required amount here will override a formula used later)
+const multiSigRequiredVote = 0
+// add addresses of the owners of the multisig contract here
+const multiSigOwners = []
+
+const deployed = {} // store deployed contracts in a JSON object
 let simpleGraphTokenGovernorAddress
 
 module.exports = (deployer, network, accounts) => {
   // Simple deployment means we do not use the multisig wallet for deployment
   if (network === 'noMultisigRopsten' || network === 'noMultisigDevelopment') {
-    // governor NOTE - Governor of GraphToken is accounts[1], NOT accounts[0], because of a require statement in GraphToken.sol
+    // governor NOTE - Governor of GraphToken is accounts[1], NOT accounts[0],
+    // because of a require statement in GraphToken.sol
     simpleGraphTokenGovernorAddress = accounts[1]
-    let deployAddress = accounts[0]
-    deployer.deploy(
-      GraphToken,
-      simpleGraphTokenGovernorAddress,
-      initialSupply // initial supply
-    )
+    const deployAddress = accounts[0]
+    deployer
+      .deploy(
+        GraphToken,
+        simpleGraphTokenGovernorAddress,
+        initialSupply, // initial supply
+      )
 
-    // Deploy Staking contract using deployed GraphToken address + constants defined above
+      // Deploy Staking contract using deployed GraphToken address + constants defined above
       .then(deployedGraphToken => {
         deployed.GraphToken = deployedGraphToken
         return deployer.deploy(
@@ -45,9 +57,8 @@ module.exports = (deployer, network, accounts) => {
           defaultReserveRatio, // <uint256> defaultReserveRatio
           minimumIndexingStakingAmount, // <uint256> minimumIndexingStakingAmount
           maximumIndexers, // <uint256> maximumIndexers
-          slashingPercent, // <uint256> slashingPercent
           0, // <uint256> thawingPeriod NOTE - NO THAWING PERIOD
-          deployed.GraphToken.address // <address> token
+          deployed.GraphToken.address, // <address> token
         )
       })
       .catch(err => {
@@ -94,10 +105,16 @@ module.exports = (deployer, network, accounts) => {
       .then(deployedGNS => {
         deployed.GNS = deployedGNS
         console.log('\n')
-        console.log('SIMPLE GOVERNOR ADDRESS: ', simpleGraphTokenGovernorAddress)
+        console.log(
+          'SIMPLE GOVERNOR ADDRESS: ',
+          simpleGraphTokenGovernorAddress,
+        )
         console.log('GRAPH TOKEN ADDRESS: ', deployed.GraphToken.address)
         console.log('STAKING ADDRESS: ', deployed.Staking.address)
-        console.log('REWARDS MANAGER ADDRESS: ', deployed.RewardsManager.address)
+        console.log(
+          'REWARDS MANAGER ADDRESS: ',
+          deployed.RewardsManager.address,
+        )
         console.log('Service Registry: ', deployed.ServiceRegistry.address)
         console.log('GNS: ', deployed.GNS.address)
         console.log(`Deployed ${Object.entries(deployed).length} contracts.`)
@@ -107,20 +124,22 @@ module.exports = (deployer, network, accounts) => {
       })
   } else {
     // We need the Multisig contract address to set as governor for all upgradable contracts
-    deployer.deploy(
-      MultiSigWallet,
-      multiSigOwners.concat(accounts), // owners
-      multiSigRequiredVote || // require number of votes set above or
-      (Math.floor(accounts.length / 2) + 1 || 1) // require a majority
-    )
+    deployer
+      .deploy(
+        MultiSigWallet,
+        multiSigOwners.concat(accounts), // owners
+        multiSigRequiredVote || // require number of votes set above or
+          Math.floor(accounts.length / 2) + 1 ||
+          1, // require a majority
+      )
 
-    // Deploy the GraphToken contract before deploying the Staking contract
+      // Deploy the GraphToken contract before deploying the Staking contract
       .then(deployedMultiSigWallet => {
         deployed.MultiSigWallet = deployedMultiSigWallet
         return deployer.deploy(
           GraphToken,
           deployed.MultiSigWallet.address, // governor
-          initialSupply // initial supply
+          initialSupply, // initial supply
         )
       })
       .catch(err => {
@@ -137,9 +156,8 @@ module.exports = (deployer, network, accounts) => {
           defaultReserveRatio, // <uint256> defaultReserveRatio
           minimumIndexingStakingAmount, // <uint256> minimumIndexingStakingAmount
           maximumIndexers, // <uint256> maximumIndexers
-          slashingPercent, // <uint256> slashingPercent
           thawingPeriod, // <uint256> thawingPeriod
-          deployed.GraphToken.address // <address> token
+          deployed.GraphToken.address, // <address> token
         )
       })
       .catch(err => {
@@ -188,7 +206,10 @@ module.exports = (deployer, network, accounts) => {
         console.log('MULTISIG ADDRESS: ', deployed.MultiSigWallet.address)
         console.log('GRAPH TOKEN ADDRESS: ', deployed.GraphToken.address)
         console.log('STAKING ADDRESS: ', deployed.Staking.address)
-        console.log('REWARDS MANAGER ADDRESS: ', deployed.RewardsManager.address)
+        console.log(
+          'REWARDS MANAGER ADDRESS: ',
+          deployed.RewardsManager.address,
+        )
         console.log('Service Registry: ', deployed.ServiceRegistry.address)
         console.log('GNS: ', deployed.GNS.address)
         console.log(`Deployed ${Object.entries(deployed).length} contracts.`)
diff --git a/package-lock.json b/package-lock.json
index 5cc13c004..669a4aa39 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,12 +4,54 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
-    "@babel/runtime": {
-      "version": "7.5.4",
-      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.5.4.tgz",
-      "integrity": "sha512-Na84uwyImZZc3FKf4aUF1tysApzwf3p2yuFBIyBfbzT5glzKTdvYI4KVW4kcgjrzoGUjC7w3YyCHcJKaRxsr2Q==",
+    "@babel/code-frame": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.8.3.tgz",
+      "integrity": "sha512-a9gxpmdXtZEInkCSHUJDLHZVBgb1QS0jhss4cPP93EW7s+uC5bikET2twEF3KV+7rDblJcmNvTR7VJejqd2C2g==",
       "requires": {
-        "regenerator-runtime": "^0.13.2"
+        "@babel/highlight": "^7.8.3"
+      }
+    },
+    "@babel/highlight": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.8.3.tgz",
+      "integrity": "sha512-PX4y5xQUvy0fnEVHrYOarRPXVWafSjTW9T0Hab8gVIawpl2Sj0ORyrygANq+KjcNlSSTw0YCLSNA8OyZ1I4yEg==",
+      "requires": {
+        "chalk": "^2.0.0",
+        "esutils": "^2.0.2",
+        "js-tokens": "^4.0.0"
+      }
+    },
+    "@openzeppelin/contract-loader": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/@openzeppelin/contract-loader/-/contract-loader-0.4.0.tgz",
+      "integrity": "sha512-K+Pl4tn0FbxMSP0H9sgi61ayCbecpqhQmuBshelC7A3q2MlpcqWRJan0xijpwdtv6TORNd5oZNe/+f3l+GD6tw==",
+      "requires": {
+        "find-up": "^4.1.0",
+        "fs-extra": "^8.1.0",
+        "try-require": "^1.2.1"
+      }
+    },
+    "@openzeppelin/contracts": {
+      "version": "2.5.0",
+      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-2.5.0.tgz",
+      "integrity": "sha512-t3jm8FrhL9tkkJTofkznTqo/XXdHi21w5yXwalEnaMOp22ZwZ0f/mmKdlgMMLPFa6bSVHbY88mKESwJT/7m5Lg=="
+    },
+    "@openzeppelin/test-helpers": {
+      "version": "0.5.5",
+      "resolved": "https://registry.npmjs.org/@openzeppelin/test-helpers/-/test-helpers-0.5.5.tgz",
+      "integrity": "sha512-jTSCQojQ0Q7FBMN3Me7o0OIVuRnfHRR9TcE+ZlfbSfdqrHkFLwSfeDHSNWtQGlF1xPQR5r3iRI0ccsCrN+JblA==",
+      "requires": {
+        "@openzeppelin/contract-loader": "^0.4.0",
+        "@truffle/contract": "^4.0.35",
+        "ansi-colors": "^3.2.3",
+        "chai": "^4.2.0",
+        "chai-bn": "^0.2.1",
+        "ethjs-abi": "^0.2.1",
+        "lodash.flatten": "^4.4.0",
+        "semver": "^5.6.0",
+        "web3": "^1.2.1",
+        "web3-utils": "^1.2.1"
       }
     },
     "@resolver-engine/core": {
@@ -30,12 +72,6 @@
           "requires": {
             "ms": "^2.1.1"
           }
-        },
-        "ms": {
-          "version": "2.1.2",
-          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
-          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
-          "dev": true
         }
       }
     },
@@ -57,12 +93,6 @@
           "requires": {
             "ms": "^2.1.1"
           }
-        },
-        "ms": {
-          "version": "2.1.2",
-          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
-          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
-          "dev": true
         }
       }
     },
@@ -85,12 +115,6 @@
           "requires": {
             "ms": "^2.1.1"
           }
-        },
-        "ms": {
-          "version": "2.1.2",
-          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
-          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
-          "dev": true
         }
       }
     },
@@ -113,12 +137,6 @@
           "requires": {
             "ms": "^2.1.1"
           }
-        },
-        "ms": {
-          "version": "2.1.2",
-          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
-          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
-          "dev": true
         }
       }
     },
@@ -135,14 +153,153 @@
         "defer-to-connect": "^1.0.1"
       }
     },
+    "@truffle/blockchain-utils": {
+      "version": "0.0.18",
+      "resolved": "https://registry.npmjs.org/@truffle/blockchain-utils/-/blockchain-utils-0.0.18.tgz",
+      "integrity": "sha512-XnRu5p1QO9krJizOeBY5WfzPDvEOmCnOT5u6qF8uN3Kkq9vcH3ZqW4XTuzz9ERZNpZfWb3UJx4PUosgeHLs5vw==",
+      "requires": {
+        "source-map-support": "^0.5.16"
+      }
+    },
+    "@truffle/contract": {
+      "version": "4.1.13",
+      "resolved": "https://registry.npmjs.org/@truffle/contract/-/contract-4.1.13.tgz",
+      "integrity": "sha512-LLtRU4rRBd9jw/ngpYKwr++pEzdR64/vu2UjSxeizP1wIDm1XAIJ7BH2QiWh4PV2i44KzAfgvPtOwgbwr2hvdw==",
+      "requires": {
+        "@truffle/blockchain-utils": "^0.0.18",
+        "@truffle/contract-schema": "^3.0.23",
+        "@truffle/error": "^0.0.8",
+        "@truffle/interface-adapter": "^0.4.6",
+        "bignumber.js": "^7.2.1",
+        "ethereum-ens": "^0.8.0",
+        "ethers": "^4.0.0-beta.1",
+        "exorcist": "^1.0.1",
+        "source-map-support": "^0.5.16",
+        "web3": "1.2.1",
+        "web3-core-promievent": "1.2.1",
+        "web3-eth-abi": "1.2.1",
+        "web3-utils": "1.2.1"
+      },
+      "dependencies": {
+        "eth-lib": {
+          "version": "0.2.7",
+          "resolved": "https://registry.npmjs.org/eth-lib/-/eth-lib-0.2.7.tgz",
+          "integrity": "sha1-L5Pxex4jrsN1nNSj/iDBKGo/wco=",
+          "requires": {
+            "bn.js": "^4.11.6",
+            "elliptic": "^6.4.0",
+            "xhr-request-promise": "^0.1.2"
+          }
+        },
+        "web3": {
+          "version": "1.2.1",
+          "resolved": "https://registry.npmjs.org/web3/-/web3-1.2.1.tgz",
+          "integrity": "sha512-nNMzeCK0agb5i/oTWNdQ1aGtwYfXzHottFP2Dz0oGIzavPMGSKyVlr8ibVb1yK5sJBjrWVnTdGaOC2zKDFuFRw==",
+          "requires": {
+            "web3-bzz": "1.2.1",
+            "web3-core": "1.2.1",
+            "web3-eth": "1.2.1",
+            "web3-eth-personal": "1.2.1",
+            "web3-net": "1.2.1",
+            "web3-shh": "1.2.1",
+            "web3-utils": "1.2.1"
+          }
+        },
+        "web3-utils": {
+          "version": "1.2.1",
+          "resolved": "https://registry.npmjs.org/web3-utils/-/web3-utils-1.2.1.tgz",
+          "integrity": "sha512-Mrcn3l58L+yCKz3zBryM6JZpNruWuT0OCbag8w+reeNROSGVlXzUQkU+gtAwc9JCZ7tKUyg67+2YUGqUjVcyBA==",
+          "requires": {
+            "bn.js": "4.11.8",
+            "eth-lib": "0.2.7",
+            "ethjs-unit": "0.1.6",
+            "number-to-bn": "1.7.0",
+            "randomhex": "0.1.5",
+            "underscore": "1.9.1",
+            "utf8": "3.0.0"
+          }
+        }
+      }
+    },
+    "@truffle/contract-schema": {
+      "version": "3.0.23",
+      "resolved": "https://registry.npmjs.org/@truffle/contract-schema/-/contract-schema-3.0.23.tgz",
+      "integrity": "sha512-N4CaTMcZhOC44Vl6k2r/eua+ojUswl6mNlkVTVYMvWjfKa8GHKKClsZfkGO72aBrBzoTFsM6D75LvQIIRBy3fg==",
+      "requires": {
+        "ajv": "^6.10.0",
+        "crypto-js": "^3.1.9-1",
+        "debug": "^4.1.0"
+      }
+    },
+    "@truffle/error": {
+      "version": "0.0.8",
+      "resolved": "https://registry.npmjs.org/@truffle/error/-/error-0.0.8.tgz",
+      "integrity": "sha512-x55rtRuNfRO1azmZ30iR0pf0OJ6flQqbax1hJz+Avk1K5fdmOv5cr22s9qFnwTWnS6Bw0jvJEoR0ITsM7cPKtQ=="
+    },
+    "@truffle/interface-adapter": {
+      "version": "0.4.6",
+      "resolved": "https://registry.npmjs.org/@truffle/interface-adapter/-/interface-adapter-0.4.6.tgz",
+      "integrity": "sha512-FZAUb7tx/7VbxpAbo70+K2v22j1O7y4BwhWypRwYpf1YbE2C1OCo/L8zInaW5LfzRd2BEsfb2GjUgbK9VaFrDA==",
+      "requires": {
+        "bn.js": "^4.11.8",
+        "ethers": "^4.0.32",
+        "source-map-support": "^0.5.16",
+        "web3": "1.2.1"
+      },
+      "dependencies": {
+        "eth-lib": {
+          "version": "0.2.7",
+          "resolved": "https://registry.npmjs.org/eth-lib/-/eth-lib-0.2.7.tgz",
+          "integrity": "sha1-L5Pxex4jrsN1nNSj/iDBKGo/wco=",
+          "requires": {
+            "bn.js": "^4.11.6",
+            "elliptic": "^6.4.0",
+            "xhr-request-promise": "^0.1.2"
+          }
+        },
+        "web3": {
+          "version": "1.2.1",
+          "resolved": "https://registry.npmjs.org/web3/-/web3-1.2.1.tgz",
+          "integrity": "sha512-nNMzeCK0agb5i/oTWNdQ1aGtwYfXzHottFP2Dz0oGIzavPMGSKyVlr8ibVb1yK5sJBjrWVnTdGaOC2zKDFuFRw==",
+          "requires": {
+            "web3-bzz": "1.2.1",
+            "web3-core": "1.2.1",
+            "web3-eth": "1.2.1",
+            "web3-eth-personal": "1.2.1",
+            "web3-net": "1.2.1",
+            "web3-shh": "1.2.1",
+            "web3-utils": "1.2.1"
+          }
+        },
+        "web3-utils": {
+          "version": "1.2.1",
+          "resolved": "https://registry.npmjs.org/web3-utils/-/web3-utils-1.2.1.tgz",
+          "integrity": "sha512-Mrcn3l58L+yCKz3zBryM6JZpNruWuT0OCbag8w+reeNROSGVlXzUQkU+gtAwc9JCZ7tKUyg67+2YUGqUjVcyBA==",
+          "requires": {
+            "bn.js": "4.11.8",
+            "eth-lib": "0.2.7",
+            "ethjs-unit": "0.1.6",
+            "number-to-bn": "1.7.0",
+            "randomhex": "0.1.5",
+            "underscore": "1.9.1",
+            "utf8": "3.0.0"
+          }
+        }
+      }
+    },
     "@types/bn.js": {
-      "version": "4.11.5",
-      "resolved": "https://registry.npmjs.org/@types/bn.js/-/bn.js-4.11.5.tgz",
-      "integrity": "sha512-AEAZcIZga0JgVMHNtl1CprA/hXX7/wPt79AgR4XqaDt7jyj3QWYw6LPoOiznPtugDmlubUnAahMs2PFxGcQrng==",
+      "version": "4.11.6",
+      "resolved": "https://registry.npmjs.org/@types/bn.js/-/bn.js-4.11.6.tgz",
+      "integrity": "sha512-pqr857jrp2kPuO9uRjZ3PwnJTjoQy+fcdxvBTvHm6dkmEL9q+hDD/2j/0ELOBPtPnS8LjCX0gI9nbl8lVkadpg==",
       "requires": {
         "@types/node": "*"
       }
     },
+    "@types/color-name": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/@types/color-name/-/color-name-1.1.1.tgz",
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         "require-main-filename": "^1.0.1",
         "set-blocking": "^2.0.0",
-        "string-width": "^1.0.2",
-        "which-module": "^1.0.0",
+        "string-width": "^2.0.0",
+        "which-module": "^2.0.0",
         "y18n": "^3.2.1",
-        "yargs-parser": "^5.0.0"
+        "yargs-parser": "^8.1.0"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
+          "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
+          "dev": true
+        },
+        "find-up": {
+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/find-up/-/find-up-2.1.0.tgz",
+          "integrity": "sha1-RdG35QbHF93UgndaK3eSCjwMV6c=",
+          "dev": true,
+          "requires": {
+            "locate-path": "^2.0.0"
+          }
+        },
+        "is-fullwidth-code-point": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
+          "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=",
+          "dev": true
+        },
+        "locate-path": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-2.0.0.tgz",
+          "integrity": "sha1-K1aLJl7slExtnA3pw9u7ygNUzY4=",
+          "dev": true,
+          "requires": {
+            "p-locate": "^2.0.0",
+            "path-exists": "^3.0.0"
+          }
+        },
+        "p-limit": {
+          "version": "1.3.0",
+          "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-1.3.0.tgz",
+          "integrity": "sha512-vvcXsLAJ9Dr5rQOPk7toZQZJApBl2K4J6dANSsEuh6QI41JYcsS/qhTGa9ErIUUgK3WNQoJYvylxvjqmiqEA9Q==",
+          "dev": true,
+          "requires": {
+            "p-try": "^1.0.0"
+          }
+        },
+        "p-locate": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-2.0.0.tgz",
+          "integrity": "sha1-IKAQOyIqcMj9OcwuWAaA893l7EM=",
+          "dev": true,
+          "requires": {
+            "p-limit": "^1.1.0"
+          }
+        },
+        "p-try": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/p-try/-/p-try-1.0.0.tgz",
+          "integrity": "sha1-y8ec26+P1CKOE/Yh8rGiN8GyB7M=",
+          "dev": true
+        },
+        "path-exists": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-3.0.0.tgz",
+          "integrity": "sha1-zg6+ql94yxiSXqfYENe1mwEP1RU=",
+          "dev": true
+        },
+        "string-width": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
+          "integrity": "sha512-nOqH59deCq9SRHlxq1Aw85Jnt4w6KvLKqWVik6oA9ZklXLNIOlqg4F2yrT1MVaTjAqvVwdfeZ7w7aCvJD7ugkw==",
+          "dev": true,
+          "requires": {
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^4.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
+          "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^3.0.0"
+          }
+        }
       }
     },
     "yargs-parser": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-5.0.0.tgz",
-      "integrity": "sha1-J17PDX/+Bcd+ZOfIbkzZS/DhIoo=",
+      "version": "8.1.0",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-8.1.0.tgz",
+      "integrity": "sha512-yP+6QqN8BmrgW2ggLtTbdrOyBNSI7zBa4IykmiV5R1wl1JWNxQvWhMfMdmzIYtKU7oP3OOInY/tl2ov3BDjnJQ==",
+      "dev": true,
       "requires": {
-        "camelcase": "^3.0.0"
+        "camelcase": "^4.1.0"
       }
     },
     "yauzl": {
diff --git a/package.json b/package.json
index ad629e5a3..b6337adac 100644
--- a/package.json
+++ b/package.json
@@ -1,35 +1,48 @@
 {
   "name": "graph-protocol",
   "version": "1.0.0",
-  "descrnpmiption": "![WIP Badge](https://img.shields.io/badge/version-0.0.1-lightgrey.svg) ![WIP Badge](https://img.shields.io/badge/status-wip-yellowgreen.svg)",
+  "description": "",
   "main": "graphProtocol.js",
   "directories": {
     "test": "test"
   },
   "dependencies": {
+    "@openzeppelin/contracts": "^2.5.0",
+    "@openzeppelin/test-helpers": "^0.5.5",
     "chai": "^4.2.0",
-    "openzeppelin-solidity": "^2.3.0",
-    "openzeppelin-test-helpers": "0.4.0",
-    "truffle": "5.0.20",
+    "eslint": "^6.8.0",
+    "eslint-config-standard": "^14.1.0",
+    "eslint-plugin-import": "^2.20.1",
+    "eslint-plugin-mocha-no-only": "^1.1.0",
+    "eslint-plugin-node": "^11.0.0",
+    "eslint-plugin-promise": "^4.2.1",
+    "eslint-plugin-standard": "^4.0.1",
+    "eth-lib": "^0.1.29",
+    "openzeppelin-solidity": "^2.5.0",
+    "prettier-plugin-solidity": "^1.0.0-alpha.45",
+    "truffle": "^5.1.17",
     "truffle-hdwallet-provider": "^1.0.14",
-    "web3": "1.0.0-beta.55"
+    "web3": "^1.2.6"
   },
   "devDependencies": {
     "ethlint": "^1.2.5",
     "ipfs-http-client": "34.0.0",
     "prettier": "^1.19.1",
-    "prettier-plugin-solidity": "^1.0.0-alpha.41",
     "truffle-abi": "^1.0.3",
-    "truffle-assertions": "0.8.0",
+    "truffle-assertions": "^0.9.2",
     "truffle-flattener": "^1.4.2",
-    "typechain": "^0.3.20"
+    "typechain": "^1.0.5"
   },
   "scripts": {
     "build": "npm run compile && npm run flatten && npm run abi:extract",
     "compile": "truffle compile",
     "test": "truffle test",
-    "lint": "solium --dir ./contracts",
-    "lint:fix": "solium --dir ./contracts --fix",
+    "lint": "npm run lint:js && npm run lint:sol",
+    "lint:fix": "npm run lint:js:fix && npm run lint:sol:fix",
+    "lint:js": "eslint .",
+    "lint:js:fix": "eslint . --fix",
+    "lint:sol": "solium --dir ./contracts",
+    "lint:sol:fix": "solium --dir ./contracts --fix",
     "prettier": "prettier --write 'contracts/*.sol' 'test/**/*.js'",
     "flatten": "scripts/flatten.sh",
     "abi:extract": "truffle-abi -d ./build/contracts -o ./build/abis/ -v",
diff --git a/test/disputes.test.js b/test/disputes.test.js
new file mode 100644
index 000000000..4ad3f291f
--- /dev/null
+++ b/test/disputes.test.js
@@ -0,0 +1,519 @@
+const { expect } = require('chai')
+const {
+  constants,
+  expectEvent,
+  expectRevert,
+} = require('@openzeppelin/test-helpers')
+const { ZERO_ADDRESS } = constants
+
+// helpers
+const attestation = require('./lib/attestation')
+const deployment = require('./lib/deployment')
+const helpers = require('./lib/testHelpers')
+
+const MAX_PPM = 1000000
+const NON_EXISTING_DISPUTE_ID = '0x0'
+
+contract(
+  'Disputes',
+  ([me, other, governor, arbitrator, indexNode, fisherman]) => {
+    beforeEach(async function() {
+      this.indexNodePrivKey =
+        '0xadd53f9a7e588d003326d1cbf9e4a43c061aadd9bc938c843a79e7b4fd2ad743'
+
+      // Deploy graph token
+      this.graphToken = await deployment.deployGraphToken(governor, {
+        from: me,
+      })
+
+      // Deploy staking contract
+      this.staking = await deployment.deployStakingContract(
+        governor,
+        this.graphToken.address,
+        { from: me },
+      )
+
+      // Deploy dispute contract
+      this.disputeManager = await deployment.deployDisputeManagerContract(
+        governor,
+        this.graphToken.address,
+        arbitrator,
+        this.staking.address,
+        { from: me },
+      )
+    })
+
+    describe('state variables accesors', () => {
+      it('should set `governor`', async function() {
+        // Set right in the constructor
+        expect(await this.disputeManager.governor()).to.equal(governor)
+
+        // Can set if allowed
+        await this.disputeManager.transferGovernance(other, { from: governor })
+        expect(await this.disputeManager.governor()).to.equal(other)
+      })
+
+      it('should set `graphToken`', async function() {
+        // Set right in the constructor
+        expect(await this.disputeManager.token()).to.equal(
+          this.graphToken.address,
+        )
+      })
+
+      it('should set `arbitrator` only if allowed', async function() {
+        // Set right in the constructor
+        expect(await this.disputeManager.arbitrator()).to.equal(arbitrator)
+
+        // Can set if allowed
+        await this.disputeManager.setArbitrator(other, { from: governor })
+        expect(await this.disputeManager.arbitrator()).to.equal(other)
+      })
+
+      it('reject set `arbitrator` if empty address', async function() {
+        await expectRevert(
+          this.disputeManager.setArbitrator(ZERO_ADDRESS, { from: governor }),
+          'Cannot set arbitrator to empty address',
+        )
+      })
+
+      it('reject set `arbitrator` if not allowed', async function() {
+        await expectRevert(
+          this.disputeManager.setArbitrator(arbitrator, { from: other }),
+          'Only Governor can call',
+        )
+      })
+
+      it('should set `slashingPercent`', async function() {
+        // Set right in the constructor
+        expect(
+          await this.disputeManager.slashingPercent(),
+        ).to.be.bignumber.equal(
+          helpers.stakingConstants.slashingPercent.toString(),
+        )
+
+        // Can set if allowed
+        await this.disputeManager.setSlashingPercent(0, { from: governor })
+        await this.disputeManager.setSlashingPercent(1, { from: governor })
+        await this.disputeManager.setSlashingPercent(
+          helpers.stakingConstants.slashingPercent,
+          { from: governor },
+        )
+      })
+
+      it('reject set `slashingPercent` if out of bounds', async function() {
+        await expectRevert(
+          this.disputeManager.setSlashingPercent(MAX_PPM + 1, {
+            from: governor,
+          }),
+          'Slashing percent must be below or equal to MAX_PPM',
+        )
+      })
+
+      it('reject set `slashingPercent` if not allowed', async function() {
+        await expectRevert(
+          this.disputeManager.setSlashingPercent(50, { from: other }),
+          'Only Governor can call',
+        )
+      })
+    })
+
+    describe('token transfer', function() {
+      it('reject calls to token received hook if not the GRT token contract', async function() {
+        await expectRevert(
+          this.disputeManager.tokensReceived(fisherman, 10000, '0x0', {
+            from: me,
+          }),
+          'Caller is not the GRT token contract',
+        )
+      })
+    })
+
+    describe('reward calculation', function() {
+      it('should calculate the reward for a stake', async function() {
+        const stakedAmount = 1000
+        const trueReward =
+          (helpers.stakingConstants.slashingPercent * stakedAmount) / MAX_PPM
+        const funcReward = await this.disputeManager.getRewardForStake(
+          stakedAmount,
+        )
+        expect(funcReward).to.be.bignumber.equal(trueReward.toString())
+      })
+    })
+
+    describe('dispute lifecycle', function() {
+      before(async function() {
+        // Defaults
+        this.tokensForIndexNode =
+          helpers.graphTokenConstants.tokensMintedForStaker
+        this.tokensForFisherman =
+          helpers.graphTokenConstants.tokensMintedForStaker
+        this.indexNodeStake = this.tokensForIndexNode
+
+        // Create a subgraphId
+        this.subgraphId = helpers.randomSubgraphIdHex0x()
+      })
+
+      context('when stake does not exist', function() {
+        it('reject create a dispute', async function() {
+          // Give some funds to the fisherman
+          await this.graphToken.mint(fisherman, this.tokensForFisherman, {
+            from: governor,
+          })
+
+          // Get index node signed attestation
+          const dispute = await attestation.createDisputePayload(
+            this.subgraphId,
+            this.disputeManager.address,
+            this.indexNodePrivKey,
+          )
+
+          // Create dispute
+          await expectRevert(
+            this.graphToken.transferToTokenReceiver(
+              this.disputeManager.address,
+              this.tokensForFisherman,
+              dispute.payload,
+              { from: fisherman },
+            ),
+            'Dispute has no stake on the subgraph by the indexer node',
+          )
+        })
+      })
+
+      context('when stake does exist', function() {
+        beforeEach(async function() {
+          // Dispute manager is allowed to slash
+          await this.staking.addSlasher(this.disputeManager.address, {
+            from: governor,
+          })
+
+          // Give some funds to the indexNode
+          await this.graphToken.mint(indexNode, this.tokensForIndexNode, {
+            from: governor,
+          })
+
+          // Index node stake funds
+          const data = '0x00' + this.subgraphId.substring(2)
+          await this.graphToken.transferToTokenReceiver(
+            this.staking.address,
+            this.indexNodeStake,
+            data,
+            { from: indexNode },
+          )
+        })
+
+        describe('create dispute', function() {
+          beforeEach(async function() {
+            // Get index node signed attestation
+            this.dispute = await attestation.createDisputePayload(
+              this.subgraphId,
+              this.disputeManager.address,
+              this.indexNodePrivKey,
+            )
+          })
+
+          it('reject fisherman deposit below minimum required', async function() {
+            // Give some funds to the fisherman
+            await this.graphToken.mint(fisherman, this.tokensForFisherman, {
+              from: governor,
+            })
+
+            // Minimum deposit a fisherman is required to do should be >= reward
+            const minimumDeposit = await this.disputeManager.getRewardForStake(
+              this.indexNodeStake,
+            )
+            const belowMinimumDeposit = minimumDeposit.sub(web3.utils.toBN(1))
+
+            // Create invalid dispute as deposit is below minimum
+            await expectRevert(
+              this.graphToken.transferToTokenReceiver(
+                this.disputeManager.address,
+                belowMinimumDeposit,
+                this.dispute.payload,
+                { from: fisherman },
+              ),
+              'Dispute deposit under minimum required',
+            )
+          })
+
+          it('should create a dispute', async function() {
+            // Give some funds to the fisherman
+            await this.graphToken.mint(fisherman, this.tokensForFisherman, {
+              from: governor,
+            })
+
+            // Create dispute
+            const { tx } = await this.graphToken.transferToTokenReceiver(
+              this.disputeManager.address,
+              this.tokensForFisherman,
+              this.dispute.payload,
+              { from: fisherman },
+            )
+
+            // Event emitted
+            expectEvent.inTransaction(
+              tx,
+              this.disputeManager.constructor,
+              'DisputeCreated',
+              {
+                disputeID: this.dispute.messageHash,
+                subgraphID: this.subgraphId,
+                indexNode: indexNode,
+                fisherman: fisherman,
+                attestation: this.dispute.attestation,
+              },
+            )
+          })
+
+          it('reject create duplicated dispute', async function() {
+            // Give some funds to the fisherman
+            await this.graphToken.mint(fisherman, this.tokensForFisherman, {
+              from: governor,
+            })
+
+            // Create dispute
+            await this.graphToken.transferToTokenReceiver(
+              this.disputeManager.address,
+              this.tokensForFisherman,
+              this.dispute.payload,
+              { from: fisherman },
+            )
+
+            // Give some funds to the fisherman
+            await this.graphToken.mint(fisherman, this.tokensForFisherman, {
+              from: governor,
+            })
+
+            // Create dispute (duplicated)
+            await expectRevert(
+              this.graphToken.transferToTokenReceiver(
+                this.disputeManager.address,
+                this.tokensForFisherman,
+                this.dispute.payload,
+                { from: fisherman },
+              ),
+              'Dispute already created',
+            )
+          })
+        })
+
+        context('when dispute is created', function() {
+          beforeEach(async function() {
+            // Get index node signed attestation
+            this.dispute = await attestation.createDisputePayload(
+              this.subgraphId,
+              this.disputeManager.address,
+              this.indexNodePrivKey,
+            )
+
+            // Give some funds to the fisherman
+            await this.graphToken.mint(fisherman, this.tokensForFisherman, {
+              from: governor,
+            })
+
+            // Create dispute
+            await this.graphToken.transferToTokenReceiver(
+              this.disputeManager.address,
+              this.tokensForFisherman,
+              this.dispute.payload,
+              { from: fisherman },
+            )
+          })
+
+          describe('accept a dispute', function() {
+            it('reject to accept a non-existing dispute', async function() {
+              await expectRevert(
+                this.disputeManager.acceptDispute(NON_EXISTING_DISPUTE_ID, {
+                  from: arbitrator,
+                }),
+                'Dispute does not exist',
+              )
+            })
+
+            it('reject to accept a dispute if not the arbitrator', async function() {
+              await expectRevert(
+                this.disputeManager.acceptDispute(this.dispute.messageHash, {
+                  from: me,
+                }),
+                'Caller is not the Arbitrator',
+              )
+            })
+
+            it('reject to accept dispute if DisputeManager is not slasher', async function() {
+              // Dispute manager is not allowed to slash
+              await this.staking.removeSlasher(this.disputeManager.address, {
+                from: governor,
+              })
+
+              // Perform transaction (accept)
+              await expectRevert(
+                this.disputeManager.acceptDispute(this.dispute.messageHash, {
+                  from: arbitrator,
+                }),
+                'Caller is not a Slasher',
+              )
+            })
+
+            it('should resolve dispute, slash indexer and reward the fisherman', async function() {
+              const fishermanBalanceBefore = await this.graphToken.balanceOf(
+                fisherman,
+              )
+              const totalSupplyBefore = await this.graphToken.totalSupply()
+              const reward = await this.disputeManager.getRewardForStake(
+                this.indexNodeStake,
+              )
+
+              // Perform transaction (accept)
+              await this.disputeManager.acceptDispute(
+                this.dispute.messageHash,
+                { from: arbitrator },
+              )
+
+              // Fisherman reward properly assigned + deposit returned
+              const deposit = web3.utils.toBN(this.tokensForFisherman)
+              const fishermanBalanceAfter = await this.graphToken.balanceOf(
+                fisherman,
+              )
+              expect(fishermanBalanceAfter).to.be.bignumber.equal(
+                fishermanBalanceBefore.add(deposit).add(reward),
+              )
+
+              // IndexNode slashed
+              const currentIndexNodeStake = await this.staking.getIndexingNodeStake(
+                this.subgraphId,
+                indexNode,
+              )
+              expect(currentIndexNodeStake).to.be.bignumber.equal(
+                web3.utils.toBN(0),
+              )
+
+              // Slashed funds burned
+              const indexNodeStake = web3.utils.toBN(this.indexNodeStake)
+              const totalSupplyAfter = await this.graphToken.totalSupply()
+              expect(totalSupplyAfter).to.be.bignumber.equal(
+                totalSupplyBefore.sub(indexNodeStake.sub(reward)),
+              )
+            })
+          })
+
+          describe('reject a dispute', async function() {
+            it('reject to reject a non-existing dispute', async function() {
+              await expectRevert(
+                this.disputeManager.rejectDispute(NON_EXISTING_DISPUTE_ID, {
+                  from: arbitrator,
+                }),
+                'Dispute does not exist',
+              )
+            })
+
+            it('reject to reject a dispute if not the arbitrator', async function() {
+              await expectRevert(
+                this.disputeManager.rejectDispute(this.dispute.messageHash, {
+                  from: me,
+                }),
+                'Caller is not the Arbitrator',
+              )
+            })
+
+            it('should reject a dispute and burn deposit', async function() {
+              const fishermanBalanceBefore = await this.graphToken.balanceOf(
+                fisherman,
+              )
+              const totalSupplyBefore = await this.graphToken.totalSupply()
+
+              // Perform transaction (reject)
+              const { tx } = await this.disputeManager.rejectDispute(
+                this.dispute.messageHash,
+                { from: arbitrator },
+              )
+
+              // No change in fisherman balance
+              const fishermanBalanceAfter = await this.graphToken.balanceOf(
+                fisherman,
+              )
+              expect(fishermanBalanceAfter).to.be.bignumber.equal(
+                fishermanBalanceBefore,
+              )
+
+              // Burn fisherman deposit
+              const totalSupplyAfter = await this.graphToken.totalSupply()
+              const burnedTokens = web3.utils.toBN(this.tokensForFisherman)
+              expect(totalSupplyAfter).to.be.bignumber.equal(
+                totalSupplyBefore.sub(burnedTokens),
+              )
+
+              // Event emitted
+              expectEvent.inTransaction(
+                tx,
+                this.disputeManager.constructor,
+                'DisputeRejected',
+                {
+                  disputeID: this.dispute.messageHash,
+                  subgraphID: this.subgraphId,
+                  indexNode: indexNode,
+                  fisherman: fisherman,
+                  amount: this.tokensForFisherman,
+                },
+              )
+            })
+          })
+
+          describe('ignore a dispute', async function() {
+            it('reject to ignore a non-existing dispute', async function() {
+              await expectRevert(
+                this.disputeManager.ignoreDispute(NON_EXISTING_DISPUTE_ID, {
+                  from: arbitrator,
+                }),
+                'Dispute does not exist',
+              )
+            })
+
+            it('reject to ignore a dispute if not the arbitrator', async function() {
+              await expectRevert(
+                this.disputeManager.ignoreDispute(this.dispute.messageHash, {
+                  from: me,
+                }),
+                'Caller is not the Arbitrator',
+              )
+            })
+
+            it('should ignore a dispute and return deposit', async function() {
+              const fishermanBalanceBefore = await this.graphToken.balanceOf(
+                fisherman,
+              )
+
+              // Perform transaction (ignore)
+              const { tx } = await this.disputeManager.ignoreDispute(
+                this.dispute.messageHash,
+                { from: arbitrator },
+              )
+
+              // Fisherman should see the deposit returned
+              const fishermanBalanceAfter = await this.graphToken.balanceOf(
+                fisherman,
+              )
+              const deposit = web3.utils.toBN(this.tokensForFisherman)
+              expect(fishermanBalanceAfter).to.be.bignumber.equal(
+                fishermanBalanceBefore.add(deposit),
+              )
+
+              // Event emitted
+              expectEvent.inTransaction(
+                tx,
+                this.disputeManager.constructor,
+                'DisputeIgnored',
+                {
+                  disputeID: this.dispute.messageHash,
+                  subgraphID: this.subgraphId,
+                  indexNode: indexNode,
+                  fisherman: fisherman,
+                  amount: this.tokensForFisherman,
+                },
+              )
+            })
+          })
+        })
+      })
+    })
+  },
+)
diff --git a/test/gns.test.js b/test/gns.test.js
index 78f4b2943..9a3e3b8e7 100644
--- a/test/gns.test.js
+++ b/test/gns.test.js
@@ -1,4 +1,4 @@
-const { expectEvent, expectRevert } = require('openzeppelin-test-helpers')
+const { expectEvent, expectRevert } = require('@openzeppelin/test-helpers')
 
 // contracts
 const GNS = artifacts.require('./GNS.sol')
@@ -196,11 +196,3 @@ contract('GNS', accounts => {
     })
   })
 })
-
-/*TODO
- * - test that both the tld and subdomains are properly registered
- * - and/or test that a subdomain can be moved to another owner, but you still own the tld and every
- * thing works
- * - and test recursive subdomains
-
- */
diff --git a/test/governance.test.js b/test/governance.test.js
index 340d12e3e..21654e4b7 100644
--- a/test/governance.test.js
+++ b/test/governance.test.js
@@ -23,29 +23,29 @@ contract('Governance', accounts => {
     )
 
     // Deploy a Governed contract with multiSigInstance1 as the `governor`
-    governedContractInstance = await ServiceRegistry.new(
+    this.governedContractInstance = await ServiceRegistry.new(
       multiSigInstance1.address,
     )
   })
 
   it('...should be governed by MultiSigWallet #1', async () => {
-    const governor = await governedContractInstance.governor.call()
+    const governor = await this.governedContractInstance.governor.call()
     assert(
-      governor == multiSigInstance1.address,
+      governor === multiSigInstance1.address,
       'MultiSigWallet1 is not the governor.',
     )
   })
 
   it('...should be able to transfer governance of self to MultiSigWallet #2', async () => {
     const txData = gp.abiEncode(
-      governedContractInstance.contract.methods.transferGovernance,
+      this.governedContractInstance.contract.methods.transferGovernance,
       [multiSigInstance2.address],
     )
     assert(txData.length, 'Transaction data was not constructed.')
 
     // Submit the transaction to the multisig for confirmation
     const transaction = await multiSigInstance1.submitTransaction(
-      governedContractInstance.address, // destination contract
+      this.governedContractInstance.address, // destination contract
       0, // value
       txData, // transaction data
     )
@@ -72,7 +72,7 @@ contract('Governance', accounts => {
     // Confirm transaction from a second multisig owner account
     await multiSigInstance1.contract.methods
       .confirmTransaction(transactionId.toNumber())
-      .send({ from: accounts[1] })
+      .send({ from: accounts[1], gas: 6e6 })
 
     // Check status is no longer `pending`
     pendingTransactionCount = await multiSigInstance1.getTransactionCount(
@@ -111,7 +111,7 @@ contract('Governance', accounts => {
 
     // Governor of the upgradable contract should now be the second multisig contract
     assert.equal(
-      await governedContractInstance.governor.call(), // contract's new governor
+      await this.governedContractInstance.governor.call(), // contract's new governor
       multiSigInstance2.address, // second multisig instance
       'Upgradable contract does not have a new governor.',
     )
diff --git a/test/graphToken.test.js b/test/graphToken.test.js
index 970ff83b0..842d55e00 100644
--- a/test/graphToken.test.js
+++ b/test/graphToken.test.js
@@ -7,6 +7,4 @@ curation.test.js.
 
 So therefore, this file is blank for now, as a placeholder, to help make clear right now we are
 okay with how much it is tested. We may add more tests here in the future.
-
-
- */
+*/
diff --git a/test/lib/attestation.js b/test/lib/attestation.js
new file mode 100644
index 000000000..085a1a9be
--- /dev/null
+++ b/test/lib/attestation.js
@@ -0,0 +1,124 @@
+const Account = require('eth-lib/lib/account')
+
+function createAttestation() {
+  const attestation = {
+    requestCID: {
+      hash: web3.utils.randomHex(32),
+      hashFunction: '0x1220',
+    },
+    responseCID: {
+      hash: web3.utils.randomHex(32),
+      hashFunction: '0x1220',
+    },
+    gasUsed: 123000, // Math.floor(Math.random() * 100000) + 100000,
+    responseBytes: 4500, // Math.floor(Math.random() * 3000) + 1000
+  }
+
+  // ABI encoded
+  return web3.eth.abi.encodeParameters(
+    ['bytes32', 'uint16', 'bytes32', 'uint16', 'uint256', 'uint256'],
+    [
+      attestation.requestCID.hash,
+      attestation.requestCID.hashFunction,
+      attestation.responseCID.hash,
+      attestation.responseCID.hashFunction,
+      attestation.gasUsed,
+      attestation.responseBytes,
+    ],
+  )
+}
+
+function createAttestationHash(attestation) {
+  const attestationTypeHash = web3.utils.sha3(
+    'Attestation(IpfsHash requestCID,IpfsHash responseCID,uint256 gasUsed,uint256 responseNumBytes)IpfsHash(bytes32 hash,uint16 hashFunction)',
+  )
+
+  // ABI encoded
+  return web3.utils.sha3(
+    web3.eth.abi.encodeParameters(
+      ['bytes32', 'bytes'],
+      [attestationTypeHash, attestation],
+    ),
+  )
+}
+
+function createDomainSeparatorHash(contractAddress) {
+  const chainId = 1
+  const domainTypeHash = web3.utils.sha3(
+    'EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)',
+  )
+  const domainNameHash = web3.utils.sha3('Graph Protocol')
+  const domainVersionHash = web3.utils.sha3('0.1')
+
+  // ABI encoded
+  return web3.utils.sha3(
+    web3.eth.abi.encodeParameters(
+      ['bytes32', 'bytes32', 'bytes32', 'uint256', 'address'],
+      [
+        domainTypeHash,
+        domainNameHash,
+        domainVersionHash,
+        chainId,
+        contractAddress,
+      ],
+    ),
+  )
+}
+
+function createMessage(domainSeparatorHash, attestationHash) {
+  return (
+    '0x1901' + domainSeparatorHash.substring(2) + attestationHash.substring(2)
+  )
+}
+
+function createPayload(subgraphId, attestation, messageSig) {
+  return (
+    '0x' +
+    subgraphId.substring(2) + // Subgraph ID without `0x` (32 bytes)
+    attestation.substring(2) + // Attestation
+    messageSig.substring(2)
+  ) // IEP712 : domain separator + signed attestation
+}
+
+async function createDisputePayload(subgraphId, contractAddress, signer) {
+  // Attestation
+  const attestation = createAttestation()
+  const attestationHash = createAttestationHash(attestation)
+
+  // Domain (EIP-712)
+  const domainSeparatorHash = createDomainSeparatorHash(contractAddress)
+
+  // Message
+  const message = createMessage(domainSeparatorHash, attestationHash)
+  const messageHash = web3.utils.sha3(message)
+  const messageSig = Account.sign(messageHash, signer)
+
+  // required bytes: 32 + 192 + 65 = 289
+  const payload = createPayload(subgraphId, attestation, messageSig)
+
+  return {
+    signer,
+
+    // domain
+    domainSeparatorHash: domainSeparatorHash,
+
+    // subgraphId
+    subgraphId,
+
+    // attestation
+    attestation,
+    attestationHash,
+
+    // message
+    message,
+    messageHash,
+    messageSig,
+
+    // payload
+    payload,
+  }
+}
+
+module.exports = {
+  createDisputePayload: createDisputePayload,
+}
diff --git a/test/lib/deployment.js b/test/lib/deployment.js
new file mode 100644
index 000000000..de7d98eff
--- /dev/null
+++ b/test/lib/deployment.js
@@ -0,0 +1,59 @@
+// contracts
+const GraphToken = artifacts.require('./GraphToken.sol')
+const Staking = artifacts.require('./Staking.sol')
+const DisputeManager = artifacts.require('./DisputeManager')
+
+// helpers
+const helpers = require('./testHelpers')
+
+function deployGraphToken(owner, params) {
+  const initialTokenSupply = helpers.graphTokenConstants.initialTokenSupply
+
+  return GraphToken.new(owner, initialTokenSupply, params)
+}
+
+function deployStakingContract(owner, graphToken, params) {
+  const minimumCurationStakingAmount =
+    helpers.stakingConstants.minimumCurationStakingAmount
+  const minimumIndexingStakingAmount =
+    helpers.stakingConstants.minimumIndexingStakingAmount
+  const defaultReserveRatio = helpers.stakingConstants.defaultReserveRatio
+  const maximumIndexers = helpers.stakingConstants.maximumIndexers
+  const thawingPeriod = helpers.stakingConstants.thawingPeriod
+
+  return Staking.new(
+    owner, // <address> governor
+    minimumCurationStakingAmount, // <uint256> minimumCurationStakingAmount
+    defaultReserveRatio, // <uint256> defaultReserveRatio (ppm)
+    minimumIndexingStakingAmount, // <uint256> minimumIndexingStakingAmount
+    maximumIndexers, // <uint256> maximumIndexers
+    thawingPeriod, // <uint256> thawingPeriod
+    graphToken, // <address> token
+    params,
+  )
+}
+
+function deployDisputeManagerContract(
+  owner,
+  graphToken,
+  arbitrator,
+  staking,
+  params,
+) {
+  const slashingPercent = helpers.stakingConstants.slashingPercent
+
+  return DisputeManager.new(
+    owner,
+    graphToken,
+    arbitrator,
+    staking,
+    slashingPercent,
+    params,
+  )
+}
+
+module.exports = {
+  deployGraphToken,
+  deployStakingContract,
+  deployDisputeManagerContract,
+}
diff --git a/test/lib/testHelpers.js b/test/lib/testHelpers.js
index fb1edb97f..2de59042e 100644
--- a/test/lib/testHelpers.js
+++ b/test/lib/testHelpers.js
@@ -1,6 +1,28 @@
 const BN = web3.utils.BN
 
+function fixSignature(signature) {
+  // in geth its always 27/28, in ganache its 0/1. Change to 27/28 to prevent
+  // signature malleability if version is 0/1
+  // see https://github.com/ethereum/go-ethereum/blob/v1.8.23/internal/ethapi/api.go#L465
+  let v = parseInt(signature.slice(130, 132), 16)
+  if (v < 27) {
+    v += 27
+  }
+  const vHex = v.toString(16)
+  return signature.slice(0, 130) + vHex
+}
+
+function toEthSignedMessageHash(messageHex) {
+  const messageBuffer = Buffer.from(messageHex.substring(2), 'hex')
+  const prefix = Buffer.from(
+    `\u0019Ethereum Signed Message:\n${messageBuffer.length}`,
+  )
+  return web3.utils.sha3(Buffer.concat([prefix, messageBuffer]))
+}
+
 module.exports = {
+  toEthSignedMessageHash,
+  fixSignature,
   randomSubgraphIdHex0x: () => web3.utils.randomHex(32),
   randomSubgraphIdHex: hex => hex.substring(2),
   randomSubgraphIdBytes: (hex = web3.utils.randomHex(32)) =>
@@ -265,26 +287,32 @@ module.exports = {
       logs = logs.filter(l => l.event === eventName)
     }
     assert.equal(logs.length, 1, 'too many logs found!')
-    let param = logs[0].args[paramName]
+    const param = logs[0].args[paramName]
     if (contractFactory != null) {
-      let contract = contractFactory.at(param)
+      const contract = contractFactory.at(param)
       assert.isObject(contract, `getting ${paramName} failed for ${param}`)
       return contract
     } else return param
   },
   stakingConstants: {
-    minimumCurationStakingAmount: new BN('100000000000000000000'), // 100 * 10^18 minimum amount allowed to be staked by Market Curators
-    minimumIndexingStakingAmount: new BN('100000000000000000000'), // 100 * 10^18 minimum amount allowed to be staked by Market Curators
+    // 100 * 10^18 minimum amount allowed to be staked by Market Curators
+    minimumCurationStakingAmount: new BN('100000000000000000000'),
+    // 100 * 10^18 minimum amount allowed to be staked by Market Curators
+    minimumIndexingStakingAmount: new BN('100000000000000000000'),
     defaultReserveRatio: 500000,
     maximumIndexers: 10,
-    slashingPercent: 10,
+    slashingPercent: 1000,
     thawingPeriod: 60 * 60 * 24 * 7, // In seconds
     thawingPeriodSimple: 0,
   },
   graphTokenConstants: {
-    initialTokenSupply: new BN('10000000000000000000000000'), // 10,000,000 * 10^18  total supply of Graph Tokens at time of deployment
-    stakingAmount: new BN('10000000000000000000000'), // 10000 * 10^18 minimum amount allowed to be staked by Market Curators
-    shareAmountFor10000: new BN('90000000000000000000000'), // When one user stakes 10000, they will get 9 shares returned, as per the bancor formula
-    tokensMintedForStaker: new BN('100000000000000000000000'), // 100000 * 10^18 minimum amount allowed to be staked by Market Curators
+    // 10,000,000 * 10^18  total supply of Graph Tokens at time of deployment
+    initialTokenSupply: new BN('10000000000000000000000000'),
+    // 10000 * 10^18 minimum amount allowed to be staked by Market Curators
+    stakingAmount: new BN('10000000000000000000000'),
+    // When one user stakes 10000, they will get 9 shares returned, as per the bancor formula
+    shareAmountFor10000: new BN('90000000000000000000000'),
+    // 100000 * 10^18 minimum amount allowed to be staked by Market Curators
+    tokensMintedForStaker: new BN('100000000000000000000000'),
   },
 }
diff --git a/test/serviceRegisty.test.js b/test/serviceRegisty.test.js
index 095e63d5f..0c407c409 100644
--- a/test/serviceRegisty.test.js
+++ b/test/serviceRegisty.test.js
@@ -1,8 +1,7 @@
-const { expectEvent, expectRevert } = require('openzeppelin-test-helpers')
+const { expectEvent } = require('@openzeppelin/test-helpers')
 
 // contracts
 const ServiceRegisty = artifacts.require('./ServiceRegistry.sol')
-const helpers = require('./lib/testHelpers')
 
 contract('Service Registry', accounts => {
   let deployedServiceRegistry
@@ -32,8 +31,7 @@ contract('Service Registry', accounts => {
   })
 
   it('...should allow setting URL with a very long string', async () => {
-    const url =
-      'https://aaaaanksgrhlqghqrefgerqfgnsqgjklsohfdhjkfkjsdhrhesrhkfshkfehkusefhkjesjhfsehjfhkserhkjsehkrhesjkrhsjhrshjkerhjkshjerhjkse.com'
+    const url = 'https://' + 'a'.repeat(125) + '.com'
 
     // Set the url
     const { logs } = await deployedServiceRegistry.setUrl(url, {
@@ -69,7 +67,7 @@ contract('Service Registry', accounts => {
       })
 
       // Verify that the indexer URL has been updated
-      let indexerUrlBytes = await deployedServiceRegistry.bootstrapIndexerURLs(
+      const indexerUrlBytes = await deployedServiceRegistry.bootstrapIndexerURLs(
         indexers[i],
       )
       assert(
diff --git a/test/staking/bondingCurve.test.js b/test/staking/bondingCurve.test.js
index d0df0f5ad..448870a73 100644
--- a/test/staking/bondingCurve.test.js
+++ b/test/staking/bondingCurve.test.js
@@ -38,24 +38,26 @@ const helpers = require('../lib/testHelpers')
  * testing constants
  */
 const minimumCurationStakingAmount =
-    helpers.stakingConstants.minimumCurationStakingAmount,
-  minimumIndexingStakingAmount =
-    helpers.stakingConstants.minimumIndexingStakingAmount,
-  defaultReserveRatio = helpers.stakingConstants.defaultReserveRatio,
-  maximumIndexers = helpers.stakingConstants.maximumIndexers,
-  slashingPercent = helpers.stakingConstants.slashingPercent,
-  simpleThawingPeriod = helpers.stakingConstants.thawingPeriodSimple,
-  initialTokenSupply = helpers.graphTokenConstants.initialTokenSupply
-let deployedStaking, deployedGraphToken, gp
+  helpers.stakingConstants.minimumCurationStakingAmount
+const minimumIndexingStakingAmount =
+  helpers.stakingConstants.minimumIndexingStakingAmount
+const defaultReserveRatio = helpers.stakingConstants.defaultReserveRatio
+const maximumIndexers = helpers.stakingConstants.maximumIndexers
+const simpleThawingPeriod = helpers.stakingConstants.thawingPeriodSimple
+const initialTokenSupply = helpers.graphTokenConstants.initialTokenSupply
+let deployedStaking
+let deployedGraphToken
+let gp
 
 /* bonding curve params */
-let totalShares, // total of staker's staked shares
-  continuousShares, // total shares issued for subgraphId
-  reserveTokenBalance, // total amount of tokens currently in reserves
-  reserveRatios, // array of ratios used in bonding curve
-  purchaseCount, // number of purchases to be made for each reserveRatios value
-  purchaseAmount, // amount of tokens being staked (purchase amount)
-  variancePercentage
+let totalShares // total of staker's staked shares
+let continuousShares // total shares issued for subgraphId
+let reserveTokenBalance // total amount of tokens currently in reserves
+let reserveRatios // array of ratios used in bonding curve
+let purchaseCount // number of purchases to be made for each reserveRatios value
+let purchaseAmount // amount of tokens being staked (purchase amount)
+// let variancePercentage
+
 const defaultParams = {
   totalShares: 1,
   continuousShares: 1,
@@ -74,12 +76,12 @@ const defaultParams = {
 
 function resetBondingParams() {
   totalShares = defaultParams.totalShares
-  ;(continuousShares = defaultParams.continuousShares),
-    (reserveTokenBalance = defaultParams.reserveTokenBalance),
-    (reserveRatios = defaultParams.reserveRatios)
+  continuousShares = defaultParams.continuousShares
+  reserveTokenBalance = defaultParams.reserveTokenBalance
+  reserveRatios = defaultParams.reserveRatios
   purchaseCount = defaultParams.purchaseCount
   purchaseAmount = defaultParams.purchaseAmount
-  variancePercentage = defaultParams.variancePercentage
+  // variancePercentage = defaultParams.variancePercentage
 }
 
 contract(
@@ -102,7 +104,6 @@ contract(
         defaultReserveRatio, // <uint256> defaultReserveRatio (ppm)
         minimumIndexingStakingAmount, // <uint256> minimumIndexingStakingAmount
         maximumIndexers, // <uint256> maximumIndexers
-        slashingPercent, // <uint256> slashingPercent
         simpleThawingPeriod, // <uint256> thawingPeriod
         deployedGraphToken.address, // <address> token
         { from: deploymentAddress },
@@ -231,7 +232,7 @@ contract(
         // Reset / set bonding params
         resetBondingParams()
         // Call contract for returned number of shares
-        let stakeToShares = await iterateStakeToShares(
+        const stakeToShares = await iterateStakeToShares(
           totalShares,
           continuousShares,
           reserveTokenBalance,
@@ -248,7 +249,7 @@ contract(
         // Reset / set bonding params
         resetBondingParams()
         // Call contract for returned number of shares
-        let stakeToShares = await iterateStakeToShares(
+        const stakeToShares = await iterateStakeToShares(
           totalShares,
           continuousShares,
           reserveTokenBalance,
@@ -324,8 +325,8 @@ async function iterateStakeToShares(
   _purchaseAmount,
   _affirmTokenPriceIncrease,
 ) {
-  let rtn,
-    lastReturn = 1
+  let rtn
+  let lastReturn = 1
   for (let r = 0; r < reserveRatios.length; r++) {
     // console.log(`\tStaking at ${reserveRatios[r]/1000000} reserve ratio`)
     // reset vars for this ratio
@@ -337,7 +338,7 @@ async function iterateStakeToShares(
     for (let p = 0; p < _purchaseCount; p++) {
       rtn = await computeStakeToShares(_purchaseAmount, reserveRatios[r])
       if (_affirmTokenPriceIncrease && rtn > lastReturn) {
-        console.error(new Error(`Price of shares has behaved unexpectedly.`))
+        console.error(new Error('Price of shares has behaved unexpectedly.'))
         return false
       }
       lastReturn = rtn
@@ -376,7 +377,6 @@ async function computeStakeToShares(
           _reserveRatio, // Reserve ratio
         ),
       )
-      // console.log(`\t  Staking ${_purchaseAmount} tokens (against ${reserveTokenBalance} existing tokens) returns ${shares} shares (plus ${continuousShares} previous total shares) for ${shares + continuousShares} total issued shares. (using ${_stakingMethod === gp.staking.stakeToShares ? 'SOL' : 'JS'})`)
       continuousShares += shares
       reserveTokenBalance = reserveTokenBalance.add(_purchaseAmount)
       totalShares += shares
@@ -412,24 +412,24 @@ function purchaseReturn(
   )
 }
 
-/**
- * @title Shares To Stake formula
- * @param {uint256} _continuousShares
- * @param {uint256} _continuousTokensReceived
- * @param {uint256} _reserveTokenBalance
- * @param {uint256} _reserveRatio
- */
-function saleReturn(
-  _continuousShares,
-  _continuousTokensReceived,
-  _reserveTokenBalance,
-  _reserveRatio,
-) {
-  // convert PPM ratios
-  if (_reserveRatio > 1) _reserveRatio = _reserveRatio / 1000000
-  return (
-    _reserveTokenBalance *
-    ((1 - (1 - _continuousTokensReceived / _continuousShares)) ^
-      (1 / _reserveRatio))
-  )
-}
+// /**
+//  * @title Shares To Stake formula
+//  * @param {uint256} _continuousShares
+//  * @param {uint256} _continuousTokensReceived
+//  * @param {uint256} _reserveTokenBalance
+//  * @param {uint256} _reserveRatio
+//  */
+// function saleReturn(
+//   _continuousShares,
+//   _continuousTokensReceived,
+//   _reserveTokenBalance,
+//   _reserveRatio,
+// ) {
+//   // convert PPM ratios
+//   if (_reserveRatio > 1) _reserveRatio = _reserveRatio / 1000000
+//   return (
+//     _reserveTokenBalance *
+//     ((1 - (1 - _continuousTokensReceived / _continuousShares)) ^
+//       (1 / _reserveRatio))
+//   )
+// }
diff --git a/test/staking/curation.test.js b/test/staking/curation.test.js
index 76934e3cc..e94885131 100644
--- a/test/staking/curation.test.js
+++ b/test/staking/curation.test.js
@@ -1,4 +1,4 @@
-const { expectEvent } = require('openzeppelin-test-helpers')
+const { expectEvent } = require('@openzeppelin/test-helpers')
 // const Web3 = require("web3")
 // const web3 = new Web3(Web3.givenProvider)
 // console.log(web3.utils)
@@ -19,23 +19,22 @@ contract(
      * testing constants & variables
      */
     const minimumCurationStakingAmount =
-        helpers.stakingConstants.minimumCurationStakingAmount,
-      minimumIndexingStakingAmount =
-        helpers.stakingConstants.minimumIndexingStakingAmount,
-      defaultReserveRatio = helpers.stakingConstants.defaultReserveRatio,
-      maximumIndexers = helpers.stakingConstants.maximumIndexers,
-      slashingPercent = helpers.stakingConstants.slashingPercent,
-      simpleThawingPeriod = helpers.stakingConstants.thawingPeriodSimple,
-      initialTokenSupply = helpers.graphTokenConstants.initialTokenSupply,
-      stakingAmount = helpers.graphTokenConstants.stakingAmount,
-      shareAmountFor10000 = helpers.graphTokenConstants.shareAmountFor10000,
-      tokensMintedForStaker = helpers.graphTokenConstants.tokensMintedForStaker
-    let deployedStaking,
-      deployedGraphToken,
-      subgraphIdHex0x = helpers.randomSubgraphIdHex0x(),
-      subgraphIdHex = helpers.randomSubgraphIdHex(subgraphIdHex0x),
-      subgraphIdBytes = web3.utils.hexToBytes(subgraphIdHex0x),
-      gp
+      helpers.stakingConstants.minimumCurationStakingAmount
+    const minimumIndexingStakingAmount =
+      helpers.stakingConstants.minimumIndexingStakingAmount
+    const defaultReserveRatio = helpers.stakingConstants.defaultReserveRatio
+    const maximumIndexers = helpers.stakingConstants.maximumIndexers
+    const simpleThawingPeriod = helpers.stakingConstants.thawingPeriodSimple
+    const initialTokenSupply = helpers.graphTokenConstants.initialTokenSupply
+    const stakingAmount = helpers.graphTokenConstants.stakingAmount
+    const shareAmountFor10000 = helpers.graphTokenConstants.shareAmountFor10000
+    const tokensMintedForStaker =
+      helpers.graphTokenConstants.tokensMintedForStaker
+    let deployedStaking
+    let deployedGraphToken
+    const subgraphIdHex0x = helpers.randomSubgraphIdHex0x()
+    const subgraphIdHex = helpers.randomSubgraphIdHex(subgraphIdHex0x)
+    let gp
 
     beforeEach(async () => {
       // deploy GraphToken contract
@@ -60,7 +59,6 @@ contract(
         defaultReserveRatio, // <uint256> defaultReserveRatio
         minimumIndexingStakingAmount, // <uint256> minimumIndexingStakingAmount
         maximumIndexers, // <uint256> maximumIndexers
-        slashingPercent, // <uint256> slashingPercent
         simpleThawingPeriod, // <uint256> thawingPeriod
         deployedGraphToken.address, // <address> token
         { from: deploymentAddress },
@@ -80,7 +78,7 @@ contract(
       let curatorBalance = await deployedGraphToken.balanceOf(curationStaker)
       assert(
         curatorBalance.toString() === tokensMintedForStaker.toString() &&
-          totalBalance.toString() == new BN(0).toString(),
+          totalBalance.toString() === new BN(0).toString(),
         'Balances before transfer are incorrect.',
       )
 
diff --git a/test/staking/general.test.js b/test/staking/general.test.js
index 0880dd027..ae752d133 100644
--- a/test/staking/general.test.js
+++ b/test/staking/general.test.js
@@ -22,15 +22,16 @@ contract(
      * testing constants
      */
     const minimumCurationStakingAmount =
-        helpers.stakingConstants.minimumCurationStakingAmount,
-      minimumIndexingStakingAmount =
-        helpers.stakingConstants.minimumIndexingStakingAmount,
-      defaultReserveRatio = helpers.stakingConstants.defaultReserveRatio,
-      maximumIndexers = helpers.stakingConstants.maximumIndexers,
-      slashingPercent = helpers.stakingConstants.slashingPercent,
-      simpleThawingPeriod = helpers.stakingConstants.thawingPeriodSimple,
-      initialTokenSupply = helpers.graphTokenConstants.initialTokenSupply
-    let deployedStaking, deployedGraphToken, gp
+      helpers.stakingConstants.minimumCurationStakingAmount
+    const minimumIndexingStakingAmount =
+      helpers.stakingConstants.minimumIndexingStakingAmount
+    const defaultReserveRatio = helpers.stakingConstants.defaultReserveRatio
+    const maximumIndexers = helpers.stakingConstants.maximumIndexers
+    const simpleThawingPeriod = helpers.stakingConstants.thawingPeriodSimple
+    const initialTokenSupply = helpers.graphTokenConstants.initialTokenSupply
+    let deployedStaking
+    let deployedGraphToken
+    let gp
 
     before(async () => {
       // deploy GraphToken contract
@@ -47,7 +48,6 @@ contract(
         defaultReserveRatio, // <uint256> defaultReserveRatio
         minimumIndexingStakingAmount, // <uint256> minimumIndexingStakingAmount
         maximumIndexers, // <uint256> maximumIndexers
-        slashingPercent, // <uint256> slashingPercent
         simpleThawingPeriod, // <uint256> thawingPeriod
         deployedGraphToken.address, // <address> token
         { from: deploymentAddress },
@@ -111,17 +111,6 @@ contract(
         )
       })
 
-      it('...should set `slashingPercentage` to a new value', async function() {
-        const newPercentage = 20
-        await deployedStaking.updateSlashingPercentage(newPercentage, {
-          from: daoContract,
-        })
-        assert(
-          (await gp.staking.slashingPercent()).toNumber() === newPercentage,
-          'Set `slashingPercentage` does not work.',
-        )
-      })
-
       it('...should set `thawingPeriod` to a new value', async function() {
         const thawingPeriod = 60 * 60 * 24 * 7 * 3 // 3 weeks
         await deployedStaking.updateThawingPeriod(thawingPeriod, {
@@ -133,16 +122,6 @@ contract(
         )
       })
 
-      it('...should set `arbitrator` to a new value', async function() {
-        await deployedStaking.setArbitrator(deploymentAddress, {
-          from: daoContract,
-        })
-        assert(
-          (await gp.staking.arbitrator()) === deploymentAddress,
-          'Set `arbitrator` does not work.',
-        )
-      })
-
       it('...should set `token` during construction', async function() {
         assert(
           web3.utils.isAddress(await gp.staking.token()),
diff --git a/test/staking/indexing.test.js b/test/staking/indexing.test.js
index 2bdd81582..539b6c83d 100644
--- a/test/staking/indexing.test.js
+++ b/test/staking/indexing.test.js
@@ -1,4 +1,8 @@
-const { expectEvent, expectRevert, time } = require('openzeppelin-test-helpers')
+const {
+  expectEvent,
+  expectRevert,
+  time,
+} = require('@openzeppelin/test-helpers')
 const BN = web3.utils.BN
 
 // contracts
@@ -13,22 +17,21 @@ contract(
   'Staking (Indexing)',
   ([deploymentAddress, daoContract, indexingStaker, ...accounts]) => {
     const minimumCurationStakingAmount =
-        helpers.stakingConstants.minimumCurationStakingAmount,
-      minimumIndexingStakingAmount =
-        helpers.stakingConstants.minimumIndexingStakingAmount,
-      defaultReserveRatio = helpers.stakingConstants.defaultReserveRatio,
-      maximumIndexers = helpers.stakingConstants.maximumIndexers,
-      slashingPercent = helpers.stakingConstants.slashingPercent,
-      thawingPeriod = helpers.stakingConstants.thawingPeriod,
-      initialTokenSupply = helpers.graphTokenConstants.initialTokenSupply,
-      stakingAmount = helpers.graphTokenConstants.stakingAmount,
-      tokensMintedForStaker = helpers.graphTokenConstants.tokensMintedForStaker
-    let deployedStaking,
-      deployedGraphToken,
-      subgraphIdHex0x = helpers.randomSubgraphIdHex0x(),
-      subgraphIdHex = helpers.randomSubgraphIdHex(subgraphIdHex0x),
-      subgraphIdBytes = web3.utils.hexToBytes(subgraphIdHex0x),
-      gp
+      helpers.stakingConstants.minimumCurationStakingAmount
+    const minimumIndexingStakingAmount =
+      helpers.stakingConstants.minimumIndexingStakingAmount
+    const defaultReserveRatio = helpers.stakingConstants.defaultReserveRatio
+    const maximumIndexers = helpers.stakingConstants.maximumIndexers
+    const thawingPeriod = helpers.stakingConstants.thawingPeriod
+    const initialTokenSupply = helpers.graphTokenConstants.initialTokenSupply
+    const tokensMintedForStaker =
+      helpers.graphTokenConstants.tokensMintedForStaker
+    const stakingAmount = helpers.graphTokenConstants.stakingAmount
+    const subgraphIdHex0x = helpers.randomSubgraphIdHex0x()
+    const subgraphIdHex = helpers.randomSubgraphIdHex(subgraphIdHex0x)
+    let deployedStaking
+    let deployedGraphToken
+    let gp
 
     beforeEach(async () => {
       // deploy GraphToken contract
@@ -53,7 +56,6 @@ contract(
         defaultReserveRatio, // <uint256> defaultReserveRatio (ppm)
         minimumIndexingStakingAmount, // <uint256> minimumIndexingStakingAmount
         maximumIndexers, // <uint256> maximumIndexers
-        slashingPercent, // <uint256> slashingPercent
         thawingPeriod, // <uint256> thawingPeriod
         deployedGraphToken.address, // <address> token
         { from: deploymentAddress },
@@ -204,23 +206,23 @@ contract(
         ).toNumber()
         assert(
           newLength === indexersSetLength + 1,
-          `Indexers length does not match.`,
+          'Indexers length does not match.',
         )
 
-        let indexer = await deployedStaking.graphIndexingNodeAddresses(
+        const indexer = await deployedStaking.graphIndexingNodeAddresses(
           newLength - 1,
         )
-        assert(indexer === indexingStaker, `Indexer address does not match.`)
+        assert(indexer === indexingStaker, 'Indexer address does not match.')
 
         await beginLogout()
 
         // Note - index isn't deleted on the array, the entry is just zeroed
-        let blankIndexer = await deployedStaking.graphIndexingNodeAddresses(
+        const blankIndexer = await deployedStaking.graphIndexingNodeAddresses(
           newLength - 1,
         )
         assert(
           blankIndexer === helpers.zeroAddress(),
-          `Indexer was not deleted.`,
+          'Indexer was not deleted.',
         )
       })
     })
@@ -344,7 +346,7 @@ contract(
       )
 
       for (let i = 0; i < 3; i++) {
-        let indexer = await deployedStaking.graphIndexingNodeAddresses(i)
+        const indexer = await deployedStaking.graphIndexingNodeAddresses(i)
         assert(indexer === indexers[i], `Indexer address ${i} does not match.`)
       }
     }
diff --git a/test/staking/slashing.test.js b/test/staking/slashing.test.js
deleted file mode 100644
index 7ee97041f..000000000
--- a/test/staking/slashing.test.js
+++ /dev/null
@@ -1,205 +0,0 @@
-const { expectEvent } = require('openzeppelin-test-helpers')
-
-// contracts
-const GraphToken = artifacts.require('./GraphToken.sol')
-const Staking = artifacts.require('./Staking.sol')
-
-// helpers
-const GraphProtocol = require('../../graphProtocol.js')
-const helpers = require('../lib/testHelpers')
-
-contract(
-  'Staking (Slashing)',
-  ([
-    deploymentAddress,
-    daoContract,
-    indexingStaker,
-    fisherman,
-    ...accounts
-  ]) => {
-    /**
-     * testing constants
-     */
-    const minimumCurationStakingAmount =
-        helpers.stakingConstants.minimumCurationStakingAmount,
-      minimumIndexingStakingAmount =
-        helpers.stakingConstants.minimumIndexingStakingAmount,
-      defaultReserveRatio = helpers.stakingConstants.defaultReserveRatio,
-      maximumIndexers = helpers.stakingConstants.maximumIndexers,
-      slashingPercent = helpers.stakingConstants.slashingPercent,
-      thawingPeriod = helpers.stakingConstants.thawingPeriod,
-      initialTokenSupply = helpers.graphTokenConstants.initialTokenSupply,
-      stakingAmount = helpers.graphTokenConstants.stakingAmount,
-      shareAmountFor10000 = helpers.graphTokenConstants.shareAmountFor10000,
-      tokensMintedForStaker = helpers.graphTokenConstants.tokensMintedForStaker,
-      chainId = 1,
-      domainTypeHash = web3.utils.sha3(
-        'EIP712Domain(string name,string version,uint256 chainId,address verifyingContract,bytes32 salt)',
-      ),
-      domainNameHash = web3.utils.sha3('Graph Protocol'),
-      domainVersionHash = web3.utils.sha3('0.1'),
-      attestationTypeHash = web3.utils.sha3(
-        'Attestation(IpfsHash requestCID,IpfsHash responseCID,uint256 gasUsed,uint256 responseNumBytes)IpfsHash(bytes32 hash,uint16 hashFunction)',
-      ),
-      attestationByteSize = 197
-    let deployedStaking,
-      deployedGraphToken,
-      subgraphIdHex0x = helpers.randomSubgraphIdHex0x(),
-      subgraphIdHex = helpers.randomSubgraphIdHex(subgraphIdHex0x),
-      subgraphIdBytes = web3.utils.hexToBytes(subgraphIdHex0x),
-      gp
-
-    before(async () => {
-      // deploy GraphToken contract
-      deployedGraphToken = await GraphToken.new(
-        daoContract, // governor
-        initialTokenSupply, // initial supply
-        { from: deploymentAddress },
-      )
-
-      // send some tokens to the staking account
-      const tokensForIndexer = await deployedGraphToken.mint(
-        indexingStaker, // to
-        tokensMintedForStaker, // value
-        { from: daoContract },
-      )
-      assert(tokensForIndexer, 'Mints Graph Tokens for Indexer.')
-
-      // deploy Staking contract
-      deployedStaking = await Staking.new(
-        daoContract, // <address> governor
-        minimumCurationStakingAmount, // <uint256> minimumCurationStakingAmount
-        defaultReserveRatio, // <uint256> defaultReserveRatio (ppm)
-        minimumIndexingStakingAmount, // <uint256> minimumIndexingStakingAmount
-        maximumIndexers, // <uint256> maximumIndexers
-        slashingPercent, // <uint256> slashingPercent
-        thawingPeriod, // <uint256> thawingPeriod
-        deployedGraphToken.address, // <address> token
-        { from: deploymentAddress },
-      )
-      assert(
-        web3.utils.isAddress(deployedStaking.address),
-        'Staking address is address.',
-      )
-
-      // init Graph Protocol JS library with deployed staking contract
-      gp = GraphProtocol({
-        Staking: deployedStaking,
-        GraphToken: deployedGraphToken,
-      })
-    })
-
-    describe('slashing', () => {
-      // Need to get this to work in the future, but not for alpha - dk
-      // it('...should allow a dispute to be created', async () => {
-      //   const data = await createDisputeDataWithSignedAttestation()
-      //   const createDispute = await deployedGraphToken.transferToTokenReceiver(
-      //     deployedStaking.address, // to
-      //     0, // value
-      //     data, // data
-      //     { from: fisherman }
-      //   )
-      //   console.log({ createDispute })
-      // })
-    })
-
-    async function createDisputeDataWithSignedAttestation() {
-      const attestationData = {
-        subgraphId: subgraphIdHex0x,
-        requestCID: {
-          hash: web3.utils.randomHex(32),
-          hashFunction: '0x1220',
-        },
-        responseCID: {
-          hash: web3.utils.randomHex(32),
-          hashFunction: '0x1220',
-        },
-        gasUsed: 123000, // Math.floor(Math.random() * 100000) + 100000,
-        responseBytes: 4500, // Math.floor(Math.random() * 3000) + 1000
-      }
-      const domainSeparator = web3.utils.sha3(
-        domainTypeHash +
-          domainNameHash +
-          domainVersionHash +
-          chainId +
-          deployedStaking.address +
-          subgraphIdHex0x,
-      )
-      const encodedAttestation = web3.eth.abi.encodeParameters(
-        [
-          'bytes32',
-          'bytes32',
-          'uint16',
-          'bytes32',
-          'uint16',
-          'uint256',
-          'uint256',
-        ],
-        [
-          attestationData.subgraphId,
-          attestationData.requestCID.hash,
-          attestationData.requestCID.hashFunction,
-          attestationData.responseCID.hash,
-          attestationData.responseCID.hashFunction,
-          attestationData.gasUsed,
-          attestationData.responseBytes,
-        ],
-      )
-      const attestationHash = web3.utils.sha3(
-        attestationTypeHash + encodedAttestation,
-      )
-      const signedAttestation = await web3.eth.sign(
-        domainSeparator + attestationHash,
-        fisherman,
-      )
-      // required bytes: 1 + 32 + 197 = 230
-      const tokensReceivedHexData =
-        '0x' +
-        '02' + // TokenReceiptAction.dispute (1 byte)
-        subgraphIdHex + // Subgraph ID without `0x` (32 bytes)
-        encodedAttestation.substring(2) + // Hex encoded attestation w/o `0x` (< 197 bytes)
-        signedAttestation.substring(2) // IEP712 domain separator signed attestation (< 197 bytes)
-      const data = web3.utils.hexToBytes(tokensReceivedHexData)
-
-      console.log({
-        //   attestationData,
-        //   domainSeparator,
-
-        // encodedAttestation,
-        encodedAttestationLength: encodedAttestation.length,
-        encodedAttestationHexLength: encodedAttestation.substring(2).length,
-        encodedAttestationByteLength: web3.utils.hexToBytes(encodedAttestation)
-          .length,
-        expectedEncodedAttestationByteLength: '< ' + attestationByteSize,
-
-        // signedAttestation,
-        signedAttestationLength: signedAttestation.length,
-        signedAttestationHexLength: signedAttestation.substring(2).length,
-        signedAttestationByteLength: web3.utils.hexToBytes(signedAttestation)
-          .length,
-        expectedSignedAttestationByteLength: '< ' + attestationByteSize,
-
-        encodedAttestationPlusSignatureByteLength:
-          web3.utils.hexToBytes(encodedAttestation).length +
-          web3.utils.hexToBytes(signedAttestation).length,
-
-        // subgraphIdHex0x,
-        subgraphIdHex0xLength: subgraphIdHex0x.length,
-        // subgraphIdHex,
-        subgraphIdHexLength: subgraphIdHex.length,
-        // subgraphIdBytes,
-        subgraphIdByteLength: subgraphIdBytes.length,
-
-        // tokensReceivedHexData,
-        tokensReceivedHexDataLength: tokensReceivedHexData.length,
-        tokensReceivedByteDataLength: data.length,
-        expectedTokensReceivedByteDataLength: 33 + attestationByteSize,
-
-        // dataSentToTokensReceived: String("[" + data.toString() + "]"),
-        PASS: data.length === 33 + attestationByteSize, // data.length should be 1 + 32 + 197 = 230
-        discrepancy: data.length - (33 + attestationByteSize),
-      })
-      return data
-    }
-  },
-)
diff --git a/test/subgraph/gns.subgraph.test.js b/test/subgraph/gns.subgraph.test.js
index 7be307628..78ea7e60f 100644
--- a/test/subgraph/gns.subgraph.test.js
+++ b/test/subgraph/gns.subgraph.test.js
@@ -1,4 +1,4 @@
-const { expectEvent, expectRevert } = require('openzeppelin-test-helpers')
+const { expectEvent } = require('@openzeppelin/test-helpers')
 
 // contracts
 const GNS = artifacts.require('./GNS.sol')
@@ -60,8 +60,7 @@ contract('GNS', accounts => {
       const topLevelDomainHash = web3.utils.soliditySha3(
         helpers.topLevelDomainNames[i],
       )
-      let ipfsHash
-      ipfsHash = helpers.testIPFSHashes[i]
+      const ipfsHash = helpers.testIPFSHashes[i]
 
       // Not in use, use when testing more than 10 in the loop
       // if (i < 10){
diff --git a/test/subgraph/serviceRegisty.subgraph.test.js b/test/subgraph/serviceRegisty.subgraph.test.js
index c4c6b7dd8..2f3eab776 100644
--- a/test/subgraph/serviceRegisty.subgraph.test.js
+++ b/test/subgraph/serviceRegisty.subgraph.test.js
@@ -1,4 +1,4 @@
-const { expectEvent } = require('openzeppelin-test-helpers')
+const { expectEvent } = require('@openzeppelin/test-helpers')
 
 // contracts
 const ServiceRegisty = artifacts.require('./ServiceRegistry.sol')
@@ -18,7 +18,6 @@ contract('Service Registry', accounts => {
   it('...should allow setting URL 10 times', async () => {
     for (let i = 0; i < 10; i++) {
       const url = helpers.testServiceRegistryURLS[i]
-      const urlBytes = web3.utils.utf8ToHex(url)
 
       // Set the url
       const { logs } = await deployedServiceRegistry.setUrl(url, {
diff --git a/test/transactionEncoding.test.js b/test/transactionEncoding.test.js
index 00b804f74..5aa865ce5 100644
--- a/test/transactionEncoding.test.js
+++ b/test/transactionEncoding.test.js
@@ -22,7 +22,7 @@ contract('NPM Module', ([deployment, governor, ...accounts]) => {
   })
 
   it('...should allow using graphProtocol.js to encode ABI transaction data', async () => {
-    const serviceProvider = accounts[0]
+    // const serviceProvider = accounts[0]
     const urlToRegister = accounts[1]
 
     // encode transaction data using encodeABI()
diff --git a/yarn.lock b/yarn.lock
deleted file mode 100644
index 2cdca54af..000000000
--- a/yarn.lock
+++ /dev/null
@@ -1,4294 +0,0 @@
-# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
-# yarn lockfile v1
-
-
-"@babel/runtime@^7.3.1":
-  version "7.5.5"
-  resolved "https://registry.npmjs.org/@babel/runtime/-/runtime-7.5.5.tgz#74fba56d35efbeca444091c7850ccd494fd2f132"
-  integrity sha512-28QvEGyQyNkB0/m2B4FU7IEZGK2NUrcMtT6BZEFALTguLk+AUT6ofsHtPk5QyjAdUkpMJ+/Em+quwz4HOt30AQ==
-  dependencies:
-    regenerator-runtime "^0.13.2"
-
-"@sindresorhus/is@^0.14.0":
-  version "0.14.0"
-  resolved "https://registry.npmjs.org/@sindresorhus/is/-/is-0.14.0.tgz#9fb3a3cf3132328151f353de4632e01e52102bea"
-  integrity sha512-9NET910DNaIPngYnLLPeg+Ogzqsi9uM4mSboU5y6p8S5DzMTVEsJZrawi+BoDNUVBa2DhJqQYUFvMDfgU062LQ==
-
-"@szmarczak/http-timer@^1.1.2":
-  version "1.1.2"
-  resolved "https://registry.npmjs.org/@szmarczak/http-timer/-/http-timer-1.1.2.tgz#b1665e2c461a2cd92f4c1bbf50d5454de0d4b421"
-  integrity sha512-XIB2XbzHTN6ieIjfIMV9hlVcfPU26s2vafYWQcZHWXHOxiaRZYEDKEwdl129Zyg50+foYV2jCgtrqSA6qNuNSA==
-  dependencies:
-    defer-to-connect "^1.0.1"
-
-"@types/bn.js@^4.11.4":
-  version "4.11.5"
-  resolved "https://registry.npmjs.org/@types/bn.js/-/bn.js-4.11.5.tgz#40e36197433f78f807524ec623afcf0169ac81dc"
-  integrity sha512-AEAZcIZga0JgVMHNtl1CprA/hXX7/wPt79AgR4XqaDt7jyj3QWYw6LPoOiznPtugDmlubUnAahMs2PFxGcQrng==
-  dependencies:
-    "@types/node" "*"
-
-"@types/mkdirp@^0.5.2":
-  version "0.5.2"
-  resolved "https://registry.npmjs.org/@types/mkdirp/-/mkdirp-0.5.2.tgz#503aacfe5cc2703d5484326b1b27efa67a339c1f"
-  integrity sha512-U5icWpv7YnZYGsN4/cmh3WD2onMY0aJIiTE6+51TwJCttdHvtCYmkBNOobHlXwrJRL0nkH9jH4kD+1FAdMN4Tg==
-  dependencies:
-    "@types/node" "*"
-
-"@types/node@*":
-  version "12.7.2"
-  resolved "https://registry.npmjs.org/@types/node/-/node-12.7.2.tgz#c4e63af5e8823ce9cc3f0b34f7b998c2171f0c44"
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-
-"@types/node@^10.12.18", "@types/node@^10.3.2":
-  version "10.14.15"
-  resolved "https://registry.npmjs.org/@types/node/-/node-10.14.15.tgz#e8f7729b631be1b02ae130ff0b61f3e018000640"
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-
-"@types/prettier@^1.13.2":
-  version "1.18.2"
-  resolved "https://registry.npmjs.org/@types/prettier/-/prettier-1.18.2.tgz#069e7d132024d436fd1f5771f6932426a695f230"
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-
-"@types/resolve@^0.0.8":
-  version "0.0.8"
-  resolved "https://registry.npmjs.org/@types/resolve/-/resolve-0.0.8.tgz#f26074d238e02659e323ce1a13d041eee280e194"
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-  dependencies:
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-
-abort-controller@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.npmjs.org/abort-controller/-/abort-controller-3.0.0.tgz#eaf54d53b62bae4138e809ca225c8439a6efb392"
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-  dependencies:
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-
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-  dependencies:
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-    negotiator "0.6.2"
-
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-  version "3.0.0"
-  resolved "https://registry.npmjs.org/aes-js/-/aes-js-3.0.0.tgz#e21df10ad6c2053295bcbb8dab40b09dbea87e4d"
-  integrity sha1-4h3xCtbCBTKVvLuNq0Cwnb6ofk0=
-
-ajv@^6.10.0, ajv@^6.5.5:
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-  resolved "https://registry.npmjs.org/ajv/-/ajv-6.10.2.tgz#d3cea04d6b017b2894ad69040fec8b623eb4bd52"
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