diff --git a/.gitignore b/.gitignore
index 3cae04f1..f07f8d5c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,7 @@ node_modules
 .env
 db
 .vscode
+abis
+verify.js.map
+verify.js
+flattened.*.sol
diff --git a/Verify.md b/Verify.md
new file mode 100644
index 00000000..f8123605
--- /dev/null
+++ b/Verify.md
@@ -0,0 +1,89 @@
+# Verify Contracts
+
+For each contract whose address appears in migration.json (and therefore is a "migrated contract") we send the contract's solidity code to etherscan.io which will attempt to "verify" that the given code corresponds to the bytecodes deployed at the address given in migration.json.
+
+**Note** Contract validation via this script currently does not work on Windows (truffle-flattener generates invalid flattened .sol files).  The fix for that is at this writing in PR at truffle-flattener.
+
+## Setup
+1. In the project root, create an ".env" file (or use the existing one) that contains:
+```
+APIKEY=[API key from https://etherscan.io/myapikey]
+```
+
+Alternately you can supply this as an OS environment variable when you run `build.verify`.
+
+2. initialize just one time, required by `build.verify`:
+
+```script
+npm run verify.initialize
+```
+
+3. build just one time or whenever you modify verify.ts, required by `verify`:
+
+```script
+npm run verify.build
+```
+
+## Verify
+
+### Verify all of the contracts migrated to the given network
+
+```script
+npm run verify -- -p [provider url] -n kovan
+```
+
+### Verify all of the contracts of a specific Arc version migrated to the given network
+
+```script
+npm run verify -- -p [provider url] -n kovan -v 0.0.1-rc.18
+```
+
+The default Arc version is the last version listed in the migration.json file for the given network.
+
+### Verify a single scheme
+
+```script
+npm run verify -- -c UpgradeScheme -p [provider url] -n kovan
+```
+
+Outputs a GUID that you can use with `npm run verify -- -g`.
+
+### Verify a single scheme at an address
+
+```script
+npm run verify -- -c UpgradeScheme -a 0x12345... -p [provider url] -n kovan
+```
+
+### Obtain a flattened contract
+
+Output the flattened script to a file named "flattened.[contractName].sol", by supplying the absolute path to a folder in which to write the file(s):
+
+```script
+npm run verify -- -f [absolute folder path] [...] -p [provider url] -n kovan
+```
+
+### Check verification status, given GUID
+
+Given the GUID that is output by `npm run verify`:
+
+```script
+npm run verify -- -g [GUID] -n kovan
+```
+
+## Help
+```script
+npm run verify.help
+```
+
+## Lint
+
+```script
+npm run verify.lint
+```
+
+And fix:
+
+```script
+npm run verify.lint.andFix
+```
+
diff --git a/package-lock.json b/package-lock.json
index 57d7eca1..1b637cdc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -57,10 +57,52 @@
         "openzeppelin-solidity": "2.1.3"
       }
     },
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-        "minipass": "^2.3.4",
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+        "minipass": "^2.3.5",
+        "minizlib": "^1.2.1",
         "mkdirp": "^0.5.0",
         "safe-buffer": "^5.1.2",
-        "yallist": "^3.0.2"
+        "yallist": "^3.0.3"
       }
     },
     "tar-stream": {
@@ -4941,7 +5185,7 @@
     },
     "through": {
       "version": "2.3.8",
-      "resolved": "http://registry.npmjs.org/through/-/through-2.3.8.tgz",
+      "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
       "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU="
     },
     "time-stamp": {
@@ -5004,10 +5248,112 @@
         }
       }
     },
+    "truffle-flattener": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/truffle-flattener/-/truffle-flattener-1.4.0.tgz",
+      "integrity": "sha512-hKpsuDBZEhH2TOTBDfKtFXJhvPbhOot/ZneKZoD7tFJ14PU2tz4C87GrenSt+TZF+iNlAjA9hq42ofl/Ynrn6w==",
+      "dev": true,
+      "requires": {
+        "@resolver-engine/imports-fs": "^0.2.2",
+        "find-up": "^2.1.0",
+        "mkdirp": "^0.5.1",
+        "solidity-parser-antlr": "^0.4.0",
+        "tsort": "0.0.1"
+      },
+      "dependencies": {
+        "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"
+          }
+        },
+        "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
+        }
+      }
+    },
     "tslib": {
-      "version": "1.9.3",
-      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.9.3.tgz",
-      "integrity": "sha512-4krF8scpejhaOgqzBEcGM7yDIEfi0/8+8zDRZhNZZ2kjmHJ4hv3zCbQWxoJGz1iw5U0Jl0nma13xzHXcncMavQ=="
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
+      "integrity": "sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ=="
+    },
+    "tslint": {
+      "version": "5.18.0",
+      "resolved": "https://registry.npmjs.org/tslint/-/tslint-5.18.0.tgz",
+      "integrity": "sha512-Q3kXkuDEijQ37nXZZLKErssQVnwCV/+23gFEMROi8IlbaBG6tXqLPQJ5Wjcyt/yHPKBC+hD5SzuGaMora+ZS6w==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.0.0",
+        "builtin-modules": "^1.1.1",
+        "chalk": "^2.3.0",
+        "commander": "^2.12.1",
+        "diff": "^3.2.0",
+        "glob": "^7.1.1",
+        "js-yaml": "^3.13.1",
+        "minimatch": "^3.0.4",
+        "mkdirp": "^0.5.1",
+        "resolve": "^1.3.2",
+        "semver": "^5.3.0",
+        "tslib": "^1.8.0",
+        "tsutils": "^2.29.0"
+      },
+      "dependencies": {
+        "commander": {
+          "version": "2.20.0",
+          "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.0.tgz",
+          "integrity": "sha512-7j2y+40w61zy6YC2iRNpUe/NwhNyoXrYpHMrSunaMG64nRnaf96zO/KMQR4OyN/UnE5KLyEBnKHd4aG3rskjpQ==",
+          "dev": true
+        }
+      }
+    },
+    "tsort": {
+      "version": "0.0.1",
+      "resolved": "https://registry.npmjs.org/tsort/-/tsort-0.0.1.tgz",
+      "integrity": "sha1-4igPXoF/i/QnVlf9D5rr1E9aJ4Y=",
+      "dev": true
+    },
+    "tsutils": {
+      "version": "2.29.0",
+      "resolved": "https://registry.npmjs.org/tsutils/-/tsutils-2.29.0.tgz",
+      "integrity": "sha512-g5JVHCIJwzfISaXpXE1qvNalca5Jwob6FjI4AoPlqMusJ6ftFE7IkkFoMhVLRgK+4Kx3gkzb8UZK5t5yTTvEmA==",
+      "dev": true,
+      "requires": {
+        "tslib": "^1.8.1"
+      }
     },
     "tunnel-agent": {
       "version": "0.6.0",
@@ -5048,6 +5394,18 @@
         "is-typedarray": "^1.0.0"
       }
     },
+    "typescript": {
+      "version": "3.5.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.5.2.tgz",
+      "integrity": "sha512-7KxJovlYhTX5RaRbUdkAXN1KUZ8PwWlTzQdHV6xNqvuFOs7+WBo10TQUqT19Q/Jz2hk5v9TQDIhyLhhJY4p5AA==",
+      "dev": true
+    },
+    "typical": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/typical/-/typical-4.0.0.tgz",
+      "integrity": "sha512-VAH4IvQ7BDFYglMd7BPRDfLgxZZX4O4TFcRDA6EN5X7erNJJq+McIEp8np9aVtxrCJ6qx4GTYVfOWNjcqwZgRw==",
+      "dev": true
+    },
     "ultron": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/ultron/-/ultron-1.1.1.tgz",
@@ -5519,9 +5877,27 @@
       "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=",
       "dev": true
     },
+    "wordwrapjs": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/wordwrapjs/-/wordwrapjs-3.0.0.tgz",
+      "integrity": "sha512-mO8XtqyPvykVCsrwj5MlOVWvSnCdT+C+QVbm6blradR7JExAhbkZ7hZ9A+9NUtwzSqrlUo9a67ws0EiILrvRpw==",
+      "dev": true,
+      "requires": {
+        "reduce-flatten": "^1.0.1",
+        "typical": "^2.6.1"
+      },
+      "dependencies": {
+        "typical": {
+          "version": "2.6.1",
+          "resolved": "https://registry.npmjs.org/typical/-/typical-2.6.1.tgz",
+          "integrity": "sha1-XAgOXWYcu+OCWdLnCjxyU+hziB0=",
+          "dev": true
+        }
+      }
+    },
     "wrap-ansi": {
       "version": "2.1.0",
-      "resolved": "http://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
       "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
       "requires": {
         "string-width": "^1.0.1",
@@ -5543,7 +5919,7 @@
         },
         "string-width": {
           "version": "1.0.2",
-          "resolved": "http://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
           "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
           "requires": {
             "code-point-at": "^1.0.0",
@@ -5553,7 +5929,7 @@
         },
         "strip-ansi": {
           "version": "3.0.1",
-          "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
           "requires": {
             "ansi-regex": "^2.0.0"
diff --git a/package.json b/package.json
index 1bcb8fca..ecc3756f 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,13 @@
     "prepare-release": "./prepare-release.sh",
     "release": "./release.sh",
     "prune-arc-build": "node ./pruneArcBuild.js",
-    "postinstall": "npm run prune-arc-build"
+    "postinstall": "npm run prune-arc-build",
+    "verify.initialize": "npm explore @daostack/arc -- npm install openzeppelin-solidity @daostack/infra --no-save && npm explore @daostack/infra -- npm install openzeppelin-solidity --no-save && npm explore @daostack/arc-hive -- npm install openzeppelin-solidity --no-save",
+    "verify.build": "node node_modules/typescript/bin/tsc verify.ts -sourceMap",
+    "verify.help": "node verify.js -h",
+    "verify.lint": "tslint -c tslint.json verify.ts",
+    "verify.lint.andFix": "npm run verify.lint -- --fix",
+    "verify": "node verify.js"
   },
   "repository": {
     "type": "git",
@@ -54,11 +60,22 @@
     "yargs": "^12.0.2"
   },
   "devDependencies": {
+    "axios": "^0.18.0",
+    "command-line-args": "^5.0.2",
+    "command-line-usage": "^5.0.5",
+    "dotenv": "^7.0.0",
+    "es6-promisify": "^6.0.1",
     "eslint": "^5.16.0",
     "eslint-config-standard": "^12.0.0",
     "eslint-plugin-import": "^2.16.0",
     "eslint-plugin-node": "^8.0.1",
     "eslint-plugin-promise": "^4.0.1",
-    "eslint-plugin-standard": "^4.0.0"
+    "eslint-plugin-standard": "^4.0.0",
+    "ethereumjs-abi": "^0.6.7",
+    "glob": "^7.1.3",
+    "querystring": "^0.2.0",
+    "truffle-flattener": "^1.3.0",
+    "tslint": "^5.14.0",
+    "typescript": "^3.3.3333"
   }
 }
diff --git a/prepare-release.sh b/prepare-release.sh
index 2798c2db..3a59d57e 100755
--- a/prepare-release.sh
+++ b/prepare-release.sh
@@ -3,9 +3,11 @@
 set -e
 source .env
 
-
 # npm ci
 echo "Installing NPM modules..."
+# best to start from sratch or the "verify" script may fail
+rm -r node_modules
+rm package-lock.json
 npm install
 npm ci
 # initial Arc vrsion to use
@@ -51,4 +53,16 @@ git add -A && git commit -m "release $(cat package.json | jq -r '.version')"
 echo "Pushing to github..."
 git push -f
 # done
-echo "Done!"
+echo "Pushed!"
+
+echo "Setting up verifications..."
+npm run verify.initialize
+npm run verify.build
+
+echo "Verifying..."
+read -n 1 -s -r -p "Press any key to verify contracts on kovan"
+npm run verify kovan
+read -n 1 -s -r -p "Press any key to verify contracts on rinkeby"
+npm run verify rinkeby
+read -n 1 -s -r -p "Press any key to verify contracts on main"
+npm run verify main
diff --git a/pruneArcBuild.js b/pruneArcBuild.js
index ad1704a4..42cf7e5f 100644
--- a/pruneArcBuild.js
+++ b/pruneArcBuild.js
@@ -10,14 +10,14 @@ const spinner = ora()
 spinner.info(`Starts pruning Arc JSON files`)
 
 files.filter(file => {
-  const { contractName, abi, bytecode, deployedBytecode } = require(`${file}`)
+  const { contractName, abi, bytecode, deployedBytecode, compiler } = require(`${file}`)
 
   spinner.info(`Pruning ${contractName}`)
 
   fs.writeFileSync(
     file,
     JSON.stringify(
-      { contractName, abi, bytecode, deployedBytecode },
+      { contractName, abi, bytecode, deployedBytecode, compiler },
       undefined,
       2
     ),
diff --git a/tslint.json b/tslint.json
new file mode 100644
index 00000000..7e183bb9
--- /dev/null
+++ b/tslint.json
@@ -0,0 +1,46 @@
+{
+  "defaultSeverity": "error",
+  "extends": [
+    "tslint:recommended"
+  ],
+  "jsRules": {},
+  "rules": {
+    "indent": [
+      true,
+      "spaces",
+      2
+    ],
+    "only-arrow-functions": false,
+    "no-var-requires": false,
+    "quotemark": [
+      true,
+      "single"
+    ],
+    "array-type": [
+      true,
+      "generic"
+    ],
+    "variable-name": [
+      true,
+      "ban-keywords",
+      "check-format",
+      "allow-leading-underscore"
+    ],
+    "max-classes-per-file": false,
+    "trailing-comma": [
+      true,
+      {
+        "multiline": {
+          "objects": "always",
+          "arrays": "always",
+          "functions": "never",
+          "typeLiterals": "ignore"
+        },
+        "singleline": "never",
+        "esSpecCompliant": true
+      }
+    ],
+    "no-console": false
+  },
+  "rulesDirectory": []
+}
diff --git a/verify.ts b/verify.ts
new file mode 100644
index 00000000..e0fca7be
--- /dev/null
+++ b/verify.ts
@@ -0,0 +1,283 @@
+const commandLineArgs = require('command-line-args');
+const commandLineUsage = require('command-line-usage');
+const ora = require('ora');
+require('dotenv').config();
+const axios = require('axios');
+const glob = require('glob');
+const path = require('path');
+import * as truffleFlattener from 'truffle-flattener';
+// tslint:disable-next-line: variable-name
+const Web3 = require('web3');
+const fs = require('fs');
+const querystring = require('querystring');
+const abi = require('ethereumjs-abi');
+import { promisify } from 'es6-promisify';
+
+const sleep = (milliseconds: number): Promise<any> => {
+  return new Promise((resolve: () => void): any => setTimeout(resolve, milliseconds));
+};
+
+// tslint:disable: max-line-length
+const optionDefinitions = [
+  { name: 'help', alias: 'h', type: Boolean, description: 'show these command line options' },
+  { name: 'version', alias: 'v', type: String, description: 'Optional Arc package version number.  Default is the last version listed in migration.json.' },
+  { name: 'contractAddress', alias: 'a', type: String, description: 'Optional address of a single contract to verify, instead of the default.  Must be given with \'contractName\'.' },
+  { name: 'contractName', alias: 'c', type: String, description: 'Optional name of a single contract to verify, instead of verifying all of them.' },
+  { name: 'network', alias: 'n', type: String, description: 'Required name of the network, such as kovan, rinkeby or mainnet.' },
+  { name: 'provider', alias: 'p', type: String, description: 'Required url for web3 network provider (not needed for -g).' },
+  { name: 'check', alias: 'g', type: String, description: 'Given verify GUID, check contract verification status.  Ignores other options.' },
+  { name: 'outputFlattened', alias: 'f', type: String, description: 'When verifying, absolute path where to save the flattened .sol file to flattened.["contractName"].sol.' },
+];
+// tslint:enable: max-line-length
+
+const options = commandLineArgs(optionDefinitions);
+
+const usage = (): void => {
+  const sections = [
+    {
+      content: 'Verify migrated Arc contracts to EtherScan.io',
+      header: 'Verify Contracts',
+    },
+    {
+      header: 'Options',
+      optionList: optionDefinitions,
+    },
+  ];
+
+  console.log(commandLineUsage(sections));
+};
+
+const error = (message: string, showUsage: boolean = false) => {
+
+  console.error(message);
+  if (showUsage) {
+    usage();
+  }
+  process.exit(1);
+};
+
+if (options.help) {
+  usage();
+  process.exit(0);
+}
+
+if (!options.network) {
+  error(`'network' is required.  Run 'npm run help' for cli information.`);
+}
+
+if (options.contractAddress && !options.contractName) {
+  error(`contractName is required when contractAddress is given. Run 'npm run help' for cli information.`);
+}
+
+const APIKEY = process.env.APIKEY;
+
+if (!APIKEY) {
+  error(`APIKEY is not found.  See README.md for more information.`);
+}
+
+let addresses = {} as any;
+let allAddresses = {} as any;
+let web3: any;
+
+if (!options.check) {
+
+  if (!options.provider) {
+    error(`'provider' is required.  Run 'npm run help' for cli information.`);
+  }
+
+  /**
+   * Enumerate contract names (each with its migrated address) and
+   * fetch the .sol file for it.
+   */
+  const migratedContracts = require('./migration.json');
+
+  options.version = options.version ||
+    migratedContracts[options.network] &&
+    // tslint:disable-next-line: max-line-length
+    (Object.keys(migratedContracts[options.network].base)[Object.keys(migratedContracts[options.network].base).length - 1]);
+
+  allAddresses = (migratedContracts[options.network] &&
+    migratedContracts[options.network].base[options.version]) || undefined;
+
+  if (!allAddresses) {
+    error(`contracts were not deployed to ${options.network}, or invalid network name`);
+  }
+
+  if (options.contractName && options.contractAddress) {
+    addresses[options.contractName] = options.contractAddress;
+  } else {
+    if (options.contractName) {
+      if (!allAddresses[options.contractName]) {
+        error(
+          `contract ${options.contractName} has not been not deployed to ${options.network}, or invalid contract name`);
+      }
+      addresses[options.contractName] = allAddresses[options.contractName];
+    } else {
+      addresses = allAddresses;
+    }
+  }
+  web3 = new Web3(options.provider);
+}
+
+const processContracts = async (): Promise<any> => {
+  let exitCode = 1;
+  let anySucceeded = false;
+  let spinner: any;
+
+  try {
+
+    const etherscanUrl =
+      `https://api${options.network === 'mainnet' ? '' : ('-' + options.network)}.etherscan.io/api`;
+
+    if (options.check) {
+      // check is the GUID
+      const result = await validateResult(options.check, etherscanUrl);
+      console.log(`Verification status: ${result.result}`);
+      exitCode = 0;
+    } else {
+
+      console.log(`Verifying contract(s) on ${options.network}, Arc version ${options.version}...`);
+      // tslint:disable-next-line: forin
+      for (const contractName in addresses) {
+
+        let constructorArguments: string;
+        const address = addresses[contractName];
+
+        switch (contractName) {
+          case 'GEN':
+          case 'ControllerCreator':
+            // ignore these
+            continue;
+
+          case 'Redeemer':
+            constructorArguments = await getConstructorParams(address, 128);
+            break;
+          case 'GenesisProtocol':
+          case 'DaoCreator':
+          case 'DAORegistry':
+            constructorArguments = await getConstructorParams(address, 64);
+            break;
+        }
+
+        spinner = ora();
+        spinner.start(`${contractName} at ${addresses[contractName]}`);
+
+        let foundIn = './node_modules/@daostack/arc';
+        process.chdir(path.join(__dirname, foundIn));
+
+        let solFilePath = glob.sync(`./contracts/**/${contractName}.sol`);
+        if (!solFilePath.length) {
+          foundIn = './node_modules/@daostack/infra';
+          process.chdir(path.join(__dirname, foundIn));
+          solFilePath = glob.sync(`./contracts/**/${contractName}.sol`);
+        }
+
+        if (!solFilePath.length) {
+          foundIn = './node_modules/@daostack/arc-hive';
+          process.chdir(path.join(__dirname, foundIn));
+          solFilePath = glob.sync(`./contracts/**/${contractName}.sol`);
+        }
+
+        if (!solFilePath.length) {
+          spinner.fail(`contract ${contractName}.sol not found`);
+          continue;
+        }
+
+        const flattened = await truffleFlattener([solFilePath[0]]);
+
+        if (options.outputFlattened) {
+          fs.writeFileSync(path.join(options.outputFlattened, `flattened.${contractName}.sol`), flattened);
+        }
+
+        let version =
+          require(`${foundIn}/build/contracts/${contractName}.json`).compiler.version;
+        version = `v${version.substr(0, version.indexOf('Emscripten') - 1)}`;
+
+        const apiConfig = {
+          action: 'verifysourcecode',
+          apikey: APIKEY,
+          compilerVersion: version,
+          constructorArguements: constructorArguments,
+          // constructorArguements: constructorArguments ? constructorArguments.toString('hex') : '',
+          contractaddress: addresses[contractName],
+          contractname: contractName,
+          module: 'contract',
+          optimizationUsed: '1',
+          runs: '200',
+          sourceCode: flattened,
+        };
+
+        const encodedPostData = querystring.stringify(apiConfig).replace(/%20/g, '+');
+        const response = await axios.post(etherscanUrl, encodedPostData,
+          {
+            headers: {
+              'Content-Length': encodedPostData.length,
+              'Content-Type': 'application/x-www-form-urlencoded',
+            },
+          }
+        );
+
+        const result = response.data;
+
+        if (result.status === '1') {
+          // 1 = submission success, use the guid returned (result.result) to check the status of the submission.
+          anySucceeded = true;
+          const verifyResult = await validateResult(result.result, etherscanUrl);
+          if (verifyResult.result !== 'Pending in queue') {
+            spinner.fail(
+              `${contractName} at ${addresses[contractName]} ${verifyResult.result}, GUID: ${result.result}`);
+          } else {
+            spinner.succeed(
+              `${contractName} at ${addresses[contractName]} ${verifyResult.result}, GUID: ${result.result}`);
+          }
+        } else {
+          if (result.result.indexOf('already verified') !== -1) {
+            spinner.info(`${contractName} at ${addresses[contractName]} ${result.result}`);
+          } else {
+            spinner.fail(`${contractName} at ${addresses[contractName]} ${result.result}`);
+          }
+        }
+        // await sleep(500);
+        // spinner.succeed(`${ contractName } at ${ addresses[contractName] } `);
+      }
+      exitCode = 0;
+    }
+  } catch (ex) {
+    if (spinner) {
+      spinner.fail();
+    }
+    console.error(ex.message);
+  } finally {
+    if (anySucceeded) {
+      // tslint:disable-next-line: max-line-length
+      console.log(`In-queue validation(s) may or may succeed.  To confirm, use -g option with GUID or check on https://${options.network === 'mainnet' ? '' : (options.network + '.')}etherscan.io/contractsVerified`);
+    }
+  }
+
+  process.exit(exitCode);
+};
+
+/**
+ * Given a GUID, confirms whether the validation really did succeed
+ * @param guid
+ * @param url
+ */
+const validateResult = async (guid: string, url: string): Promise<any> => {
+  const response = await axios.get(url,
+    {
+      params:
+        { module: 'contract', action: 'checkverifystatus', guid },
+    });
+
+  return response.data;
+};
+
+// const contructorParamsPrefix = 'a165627a7a72305820';
+
+const getConstructorParams = async (address: string, bytes: number): Promise<string> => {
+  const code = await promisify((callback: any): any =>
+    web3.eth.getCode(address, callback))() as string;
+  return code.substr(code.length - bytes);
+};
+
+processContracts();