diff --git a/.dockerignore b/.dockerignore
index 73b2734cc..af813b034 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -11,6 +11,4 @@ Dockerfile
 flats
 contracts.sublime-project
 contracts.sublime-workspace
-upgrade/*.env*
-!upgrade/.env.example
 build/
diff --git a/.eslintignore b/.eslintignore
index 3504d10ba..be20aabb6 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -1,3 +1,3 @@
 node_modules
 deploy
-upgrade
+coverage
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 8095c55fd..1484c7a86 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -53,7 +53,7 @@ jobs:
           CC_SECRET: ${{ secrets.CC_SECRET }}
   coverage:
     runs-on: ubuntu-latest
-    if: github.ref == 'refs/heads/master' || github.ref == 'refs/heads/develop' || startsWith(github.ref, 'refs/tags')
+    if: github.ref == 'refs/heads/master' || github.ref == 'refs/heads/develop' || startsWith(github.ref, 'refs/tags')  || contains(github.event.head_commit.message, 'coverage')
     steps:
       - uses: actions/setup-node@v1
         with:
diff --git a/.gitignore b/.gitignore
index 45f149d1e..70e07e3eb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,11 +4,10 @@ flats
 .node*
 .idea
 coverage
+coverage.json
 *.sublime-*
 .0x-artifacts
 deploy/*.config
 deploy/*.env*
 !deploy/.env.example
-upgrade/*.env*
-!upgrade/.env.example
 .vscode
diff --git a/.solcover.js b/.solcover.js
new file mode 100644
index 000000000..28ea3fb73
--- /dev/null
+++ b/.solcover.js
@@ -0,0 +1,39 @@
+const Web3 = require('web3')
+
+async function waitCompoundDeploy(config) {
+  const web3 = new Web3(config.provider)
+  const abi = [{
+    inputs: [{ name: "", type: "address"}],
+    outputs: [{ name: "", type: "uint256" }],
+    name: "balanceOf",
+    stateMutability: "view",
+    type: "function"
+  }]
+  const cDai = new web3.eth.Contract(abi, '0x615cba17EE82De39162BB87dBA9BcfD6E8BcF298')
+  const faucet = (await web3.eth.getAccounts())[6]
+  while (true) {
+    try {
+      if (await cDai.methods.balanceOf(faucet).call() !== '0') break
+    } catch (e) {
+      await new Promise(res => setTimeout(res, 1000))
+    }
+  }
+}
+
+module.exports = {
+  skipFiles: [
+    'Migrations.sol',
+    'mocks',
+    'interfaces',
+    'helpers'
+  ],
+  providerOptions: {
+    port: 8545,
+    _chainId: 1337,
+    network_id: 1337,
+    seed: 'TestRPC is awesome!',
+    default_balance_ether: 1000000
+  },
+  onServerReady: waitCompoundDeploy,
+  istanbulReporter: ['lcov']
+}
\ No newline at end of file
diff --git a/Dockerfile b/Dockerfile
index 03b098db0..cd883caaf 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -23,11 +23,6 @@ COPY ./deploy/package.json ./deploy/
 COPY ./deploy/package-lock.json ./deploy/
 RUN cd ./deploy; npm install --only=prod; cd ..
 
-COPY ./upgrade/package.json ./upgrade/
-COPY ./upgrade/package-lock.json ./upgrade/
-RUN cd ./upgrade; npm install --only=prod; cd ..
-
-COPY ./upgrade ./upgrade
 COPY deploy.sh deploy.sh
 COPY ./deploy ./deploy
 
diff --git a/Dockerfile.dev b/Dockerfile.dev
index 07161400f..13bca90db 100644
--- a/Dockerfile.dev
+++ b/Dockerfile.dev
@@ -14,10 +14,6 @@ COPY ./deploy/package.json ./deploy/
 COPY ./deploy/package-lock.json ./deploy/
 RUN cd ./deploy; npm install; cd ..
 
-COPY ./upgrade/package.json ./upgrade/
-COPY ./upgrade/package-lock.json ./upgrade/
-RUN cd ./upgrade; npm install; cd ..
-
 COPY truffle-config.js truffle-config.js
 COPY ./contracts ./contracts
 RUN npm run compile
@@ -29,7 +25,6 @@ COPY .eslintignore .eslintignore
 COPY .eslintrc .eslintrc
 COPY .prettierrc .prettierrc
 
-COPY ./upgrade ./upgrade
 COPY deploy.sh deploy.sh
 COPY ./deploy ./deploy
 COPY .solhint.json .solhint.json
diff --git a/contracts/ERC677BridgeToken.sol b/contracts/ERC677BridgeToken.sol
index a8d063e4e..44234b0e4 100644
--- a/contracts/ERC677BridgeToken.sol
+++ b/contracts/ERC677BridgeToken.sol
@@ -46,7 +46,7 @@ contract ERC677BridgeToken is IBurnableMintableERC677Token, DetailedERC20, Burna
     }
 
     function getTokenInterfacesVersion() external pure returns (uint64 major, uint64 minor, uint64 patch) {
-        return (2, 4, 0);
+        return (2, 5, 0);
     }
 
     function superTransfer(address _to, uint256 _value) internal returns (bool) {
diff --git a/contracts/PermittableToken.sol b/contracts/PermittableToken.sol
index 805e244ec..2ca2be870 100644
--- a/contracts/PermittableToken.sol
+++ b/contracts/PermittableToken.sol
@@ -7,8 +7,10 @@ contract PermittableToken is ERC677BridgeToken {
 
     // EIP712 niceties
     bytes32 public DOMAIN_SEPARATOR;
-    // bytes32 public constant PERMIT_TYPEHASH = keccak256("Permit(address holder,address spender,uint256 nonce,uint256 expiry,bool allowed)");
-    bytes32 public constant PERMIT_TYPEHASH = 0xea2aa0a1be11a07ed86d755c93467f4f82362b452371d1ba94d1715123511acb;
+    // bytes32 public constant PERMIT_TYPEHASH_LEGACY = keccak256("Permit(address holder,address spender,uint256 nonce,uint256 expiry,bool allowed)");
+    bytes32 public constant PERMIT_TYPEHASH_LEGACY = 0xea2aa0a1be11a07ed86d755c93467f4f82362b452371d1ba94d1715123511acb;
+    // bytes32 public constant PERMIT_TYPEHASH = keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
+    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
 
     mapping(address => uint256) public nonces;
     mapping(address => mapping(address => uint256)) public expirations;
@@ -56,7 +58,7 @@ contract PermittableToken is ERC677BridgeToken {
             } else {
                 // If allowance is unlimited by `permit`, `approve`, or `increaseAllowance`
                 // function, don't adjust it. But the expiration date must be empty or in the future
-                require(expirations[_sender][msg.sender] == 0 || expirations[_sender][msg.sender] >= _now());
+                require(expirations[_sender][msg.sender] == 0 || expirations[_sender][msg.sender] >= now);
             }
         } else {
             // If `_sender` is `msg.sender`,
@@ -71,20 +73,16 @@ contract PermittableToken is ERC677BridgeToken {
     /// @param _to The address which will spend the funds.
     /// @param _value The amount of tokens to be spent.
     function approve(address _to, uint256 _value) public returns (bool result) {
-        result = super.approve(_to, _value);
-        if (_value == uint256(-1)) {
-            delete expirations[msg.sender][_to];
-        }
+        _approveAndResetExpirations(msg.sender, _to, _value);
+        return true;
     }
 
     /// @dev Atomically increases the allowance granted to spender by the caller.
     /// @param _to The address which will spend the funds.
     /// @param _addedValue The amount of tokens to increase the allowance by.
     function increaseAllowance(address _to, uint256 _addedValue) public returns (bool result) {
-        result = super.increaseAllowance(_to, _addedValue);
-        if (allowed[msg.sender][_to] == uint256(-1)) {
-            delete expirations[msg.sender][_to];
-        }
+        _approveAndResetExpirations(msg.sender, _to, allowed[msg.sender][_to].add(_addedValue));
+        return true;
     }
 
     /// @dev An alias for `transfer` function.
@@ -134,33 +132,107 @@ contract PermittableToken is ERC677BridgeToken {
         bytes32 _r,
         bytes32 _s
     ) external {
-        require(_holder != address(0));
-        require(_spender != address(0));
-        require(_expiry == 0 || _now() <= _expiry);
-
-        require(_v == 27 || _v == 28);
-        require(uint256(_s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0);
-
-        bytes32 digest = keccak256(
-            abi.encodePacked(
-                "\x19\x01",
-                DOMAIN_SEPARATOR,
-                keccak256(abi.encode(PERMIT_TYPEHASH, _holder, _spender, _nonce, _expiry, _allowed))
-            )
-        );
+        require(_expiry == 0 || now <= _expiry);
 
-        require(_holder == ecrecover(digest, _v, _r, _s));
+        bytes32 digest = _digest(abi.encode(PERMIT_TYPEHASH_LEGACY, _holder, _spender, _nonce, _expiry, _allowed));
+
+        require(_holder == _recover(digest, _v, _r, _s));
         require(_nonce == nonces[_holder]++);
 
         uint256 amount = _allowed ? uint256(-1) : 0;
 
-        allowed[_holder][_spender] = amount;
         expirations[_holder][_spender] = _allowed ? _expiry : 0;
 
-        emit Approval(_holder, _spender, amount);
+        _approve(_holder, _spender, amount);
     }
 
-    function _now() internal view returns (uint256) {
-        return now;
+    /** @dev Allows to spend holder's unlimited amount by the specified spender according to EIP2612.
+     * The function can be called by anyone, but requires having allowance parameters
+     * signed by the holder according to EIP712.
+     * @param _holder The holder's address.
+     * @param _spender The spender's address.
+     * @param _value Allowance value to set as a result of the call.
+     * @param _deadline The deadline timestamp to call the permit function. Must be a timestamp in the future.
+     * Note that timestamps are not precise, malicious miner/validator can manipulate them to some extend.
+     * Assume that there can be a 900 seconds time delta between the desired timestamp and the actual expiration.
+     * @param _v A final byte of signature (ECDSA component).
+     * @param _r The first 32 bytes of signature (ECDSA component).
+     * @param _s The second 32 bytes of signature (ECDSA component).
+     */
+    function permit(
+        address _holder,
+        address _spender,
+        uint256 _value,
+        uint256 _deadline,
+        uint8 _v,
+        bytes32 _r,
+        bytes32 _s
+    ) external {
+        require(now <= _deadline);
+
+        uint256 nonce = nonces[_holder]++;
+        bytes32 digest = _digest(abi.encode(PERMIT_TYPEHASH, _holder, _spender, _value, nonce, _deadline));
+
+        require(_holder == _recover(digest, _v, _r, _s));
+
+        _approveAndResetExpirations(_holder, _spender, _value);
+    }
+
+    /**
+     * @dev Sets a new allowance value for the given owner and spender addresses.
+     * Resets expiration timestamp in case of unlimited approval.
+     * @param _owner address tokens holder.
+     * @param _spender address of tokens spender.
+     * @param _amount amount of approved tokens.
+     */
+    function _approveAndResetExpirations(address _owner, address _spender, uint256 _amount) internal {
+        _approve(_owner, _spender, _amount);
+
+        // it is not necessary to reset _expirations in other cases, since it is only used together with infinite allowance
+        if (_amount == uint256(-1)) {
+            delete expirations[_owner][_spender];
+        }
+    }
+
+    /**
+     * @dev Internal function for issuing an allowance.
+     * @param _owner address of the tokens owner.
+     * @param _spender address of the approved tokens spender.
+     * @param _amount amount of the approved tokens.
+     */
+    function _approve(address _owner, address _spender, uint256 _amount) internal {
+        require(_owner != address(0), "ERC20: approve from the zero address");
+        require(_spender != address(0), "ERC20: approve to the zero address");
+
+        allowed[_owner][_spender] = _amount;
+        emit Approval(_owner, _spender, _amount);
+    }
+
+    /**
+     * @dev Calculates the message digest for encoded EIP712 typed struct.
+     * @param _typedStruct encoded payload.
+     */
+    function _digest(bytes memory _typedStruct) internal view returns (bytes32) {
+        return keccak256(abi.encodePacked("\x19\x01", DOMAIN_SEPARATOR, keccak256(_typedStruct)));
+    }
+
+    /**
+     * @dev Derives the signer address for the given message digest and ECDSA signature params.
+     * @param _digest signed message digest.
+     * @param _v a final byte of signature (ECDSA component).
+     * @param _r the first 32 bytes of the signature (ECDSA component).
+     * @param _s the second 32 bytes of the signature (ECDSA component).
+     */
+    function _recover(bytes32 _digest, uint8 _v, bytes32 _r, bytes32 _s) internal pure returns (address) {
+        require(_v == 27 || _v == 28, "ECDSA: invalid signature 'v' value");
+        require(
+            uint256(_s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0,
+            "ECDSA: invalid signature 's' value"
+        );
+
+        address signer = ecrecover(_digest, _v, _r, _s);
+        require(signer != address(0), "ECDSA: invalid signature");
+
+        return signer;
     }
 }
diff --git a/contracts/gsn/token_paymaster/IUniswapRouter02.sol b/contracts/gsn/token_paymaster/IUniswapV2Router02.sol
similarity index 100%
rename from contracts/gsn/token_paymaster/IUniswapRouter02.sol
rename to contracts/gsn/token_paymaster/IUniswapV2Router02.sol
diff --git a/contracts/gsn/token_paymaster/TokenPaymaster.sol b/contracts/gsn/token_paymaster/TokenPaymaster.sol
index b59bc3e5a..587448dbb 100644
--- a/contracts/gsn/token_paymaster/TokenPaymaster.sol
+++ b/contracts/gsn/token_paymaster/TokenPaymaster.sol
@@ -4,7 +4,7 @@ pragma experimental ABIEncoderV2;
 
 import "openzeppelin-solidity/contracts/token/ERC20/ERC20.sol";
 import "../BasePaymaster.sol";
-import "./IUniswapRouter02.sol";
+import "./IUniswapV2Router02.sol";
 import "../../upgradeable_contracts/GSNForeignERC20Bridge.sol";
 
 contract TokenPaymaster is BasePaymaster {
diff --git a/contracts/libraries/ArbitraryMessage.sol b/contracts/libraries/ArbitraryMessage.sol
index daf220f03..34c8799ac 100644
--- a/contracts/libraries/ArbitraryMessage.sol
+++ b/contracts/libraries/ArbitraryMessage.sol
@@ -48,11 +48,6 @@ library ArbitraryMessage {
             gasLimit := and(shr(64, blob), 0xffffffff)
 
             dataType := byte(26, blob)
-            if gt(and(dataType, 0x7f), 0) {
-                // for now, only 0x00 and 0x80 datatypes are supported - regular AMB calls
-                // other dataType values are kept reserved for future use
-                revert(0, 0)
-            }
 
             // load source chain id length
             let chainIdLength := byte(24, blob)
diff --git a/contracts/mocks/ERC677BridgeTokenRewardableMock.sol b/contracts/mocks/ERC677BridgeTokenRewardableMock.sol
index d05742ede..e24f2cf86 100644
--- a/contracts/mocks/ERC677BridgeTokenRewardableMock.sol
+++ b/contracts/mocks/ERC677BridgeTokenRewardableMock.sol
@@ -19,13 +19,4 @@ contract ERC677BridgeTokenRewardableMock is ERC677BridgeTokenRewardable {
     function setStakingContractMock(address _stakingContract) public {
         stakingContract = _stakingContract;
     }
-
-    function setNow(uint256 _timestamp) public {
-        _blockTimestamp = _timestamp;
-    }
-
-    function _now() internal view returns (uint256) {
-        return _blockTimestamp != 0 ? _blockTimestamp : now;
-    }
-
 }
diff --git a/contracts/mocks/ForeignAMBWithGasTokenMock.sol b/contracts/mocks/ForeignAMBWithGasTokenMock.sol
index cec4adab0..c67ef00f7 100644
--- a/contracts/mocks/ForeignAMBWithGasTokenMock.sol
+++ b/contracts/mocks/ForeignAMBWithGasTokenMock.sol
@@ -9,7 +9,7 @@ import "../upgradeable_contracts/arbitrary_message/ForeignAMBWithGasToken.sol";
 contract ForeignAMBWithGasTokenMock is ForeignAMBWithGasToken {
     function gasToken() public pure returns (IGasToken) {
         // Address generated in unit test, also hardcoded in GasTokenMock
-        return IGasToken(0x5b1869D9A4C187F2EAa108f3062412ecf0526b24);
+        return IGasToken(0x64830eD3d58194d5b3Bc1BEa19F1ce9666AC0602);
     }
 
     function collectGasTokens() external {
diff --git a/contracts/mocks/PermittableTokenMock.sol b/contracts/mocks/PermittableTokenMock.sol
deleted file mode 100644
index dfe0d90e0..000000000
--- a/contracts/mocks/PermittableTokenMock.sol
+++ /dev/null
@@ -1,23 +0,0 @@
-pragma solidity 0.4.24;
-
-import "../PermittableToken.sol";
-
-contract PermittableTokenMock is PermittableToken {
-    uint256 private _blockTimestamp;
-
-    constructor(string _name, string _symbol, uint8 _decimals, uint256 _chainId)
-        public
-        PermittableToken(_name, _symbol, _decimals, _chainId)
-    {
-        // solhint-disable-previous-line no-empty-blocks
-    }
-
-    function setNow(uint256 _timestamp) public {
-        _blockTimestamp = _timestamp;
-    }
-
-    function _now() internal view returns (uint256) {
-        return _blockTimestamp != 0 ? _blockTimestamp : now;
-    }
-
-}
diff --git a/contracts/mocks/UniswapRouterMock.sol b/contracts/mocks/UniswapRouterMock.sol
index e9acff5c3..fb206e324 100644
--- a/contracts/mocks/UniswapRouterMock.sol
+++ b/contracts/mocks/UniswapRouterMock.sol
@@ -10,6 +10,7 @@ contract UniswapRouterMock {
     }
 
     function getAmountsOut(uint256 amountIn, address[] path) external pure returns (uint256[] memory amounts) {
+        (path);
         amounts = new uint256[](2);
         amounts[0] = amountIn;
         amounts[1] = amountIn / 100;
@@ -20,6 +21,7 @@ contract UniswapRouterMock {
         external
         returns (uint256[] memory amounts)
     {
+        (amountInMax, path, to, deadline);
         uint256 ethToSend = amountOut;
         uint256 tokensToTake = ethToSend * 100;
 
diff --git a/contracts/upgradeable_contracts/arbitrary_message/MessageDelivery.sol b/contracts/upgradeable_contracts/arbitrary_message/MessageDelivery.sol
index 2fd10b6a4..c26a0b867 100644
--- a/contracts/upgradeable_contracts/arbitrary_message/MessageDelivery.sol
+++ b/contracts/upgradeable_contracts/arbitrary_message/MessageDelivery.sol
@@ -28,7 +28,7 @@ contract MessageDelivery is BasicAMB, MessageProcessor {
     * @param _gas gas limit used on the other network for executing a message
     * @param _dataType AMB message dataType to be included as a part of the header
     */
-    function _sendMessage(address _contract, bytes _data, uint256 _gas, uint256 _dataType) public returns (bytes32) {
+    function _sendMessage(address _contract, bytes _data, uint256 _gas, uint256 _dataType) internal returns (bytes32) {
         // it is not allowed to pass messages while other messages are processed
         // if other is not explicitly configured
         require(messageId() == bytes32(0) || allowReentrantRequests());
diff --git a/contracts/upgradeable_contracts/arbitrary_message/VersionableAMB.sol b/contracts/upgradeable_contracts/arbitrary_message/VersionableAMB.sol
index 6ec749ebc..e6f985f20 100644
--- a/contracts/upgradeable_contracts/arbitrary_message/VersionableAMB.sol
+++ b/contracts/upgradeable_contracts/arbitrary_message/VersionableAMB.sol
@@ -17,6 +17,6 @@ contract VersionableAMB is VersionableBridge {
      * @return (major, minor, patch) version triple
      */
     function getBridgeInterfacesVersion() external pure returns (uint64 major, uint64 minor, uint64 patch) {
-        return (6, 0, 0);
+        return (6, 1, 0);
     }
 }
diff --git a/package-lock.json b/package-lock.json
index 08af0563e..3bb2c4721 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "tokenbridge-contracts",
-  "version": "6.0.0-rc0",
+  "version": "6.0.0-rc1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -34,1277 +34,569 @@
         }
       }
     },
-    "@0x/assert": {
-      "version": "3.0.27",
-      "resolved": "https://registry.npmjs.org/@0x/assert/-/assert-3.0.27.tgz",
-      "integrity": "sha512-3757yEei2UwowD75qYAvGz2eARt/4UrpECYGWVdIQ32D2/nsLnPjIkqXj0whpt1bgf8NZKPE3sOrxC3LwuCEnw==",
-      "requires": {
-        "@0x/json-schemas": "^6.1.3",
-        "@0x/typescript-typings": "^5.2.0",
-        "@0x/utils": "^6.4.3",
-        "@types/node": "12.12.54",
-        "lodash": "^4.17.11",
-        "valid-url": "^1.0.9"
-      }
-    },
-    "@0x/dev-utils": {
-      "version": "4.2.7",
-      "resolved": "https://registry.npmjs.org/@0x/dev-utils/-/dev-utils-4.2.7.tgz",
-      "integrity": "sha512-jblw/3Hpfw5E2cHTyJxbRcHsCYSCLsTOMvitbo+f/SX61HOvjXGO+T0sxy7l2d3HPu8lXaDywoZTt56ooF5EiQ==",
+    "@apollo/client": {
+      "version": "3.3.16",
+      "resolved": "https://registry.npmjs.org/@apollo/client/-/client-3.3.16.tgz",
+      "integrity": "sha512-EPTiNpmiU6/vvxpl4lXWQDqS3YddweC1sh/ewCuVP9IK0+xlVGb5vR1yhM/7T3PIJqwz52dGpZyJskmbTfENfQ==",
+      "optional": true,
       "requires": {
-        "@0x/subproviders": "^6.5.3",
-        "@0x/types": "^3.3.3",
-        "@0x/typescript-typings": "^5.2.0",
-        "@0x/utils": "^6.4.3",
-        "@0x/web3-wrapper": "^7.5.3",
-        "@types/node": "12.12.54",
-        "@types/web3-provider-engine": "^14.0.0",
-        "chai": "^4.0.1",
-        "chai-as-promised": "^7.1.0",
-        "chai-bignumber": "^3.0.0",
-        "dirty-chai": "^2.0.1",
-        "ethereum-types": "^3.5.0",
-        "lodash": "^4.17.11",
-        "web3-provider-engine": "14.0.6"
+        "@graphql-typed-document-node/core": "^3.0.0",
+        "@types/zen-observable": "^0.8.0",
+        "@wry/context": "^0.6.0",
+        "@wry/equality": "^0.4.0",
+        "fast-json-stable-stringify": "^2.0.0",
+        "graphql-tag": "^2.12.0",
+        "hoist-non-react-statics": "^3.3.2",
+        "optimism": "^0.15.0",
+        "prop-types": "^15.7.2",
+        "symbol-observable": "^2.0.0",
+        "ts-invariant": "^0.7.0",
+        "tslib": "^1.10.0",
+        "zen-observable": "^0.8.14"
       },
       "dependencies": {
-        "ethereumjs-util": {
-          "version": "5.2.1",
-          "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-5.2.1.tgz",
-          "integrity": "sha512-v3kT+7zdyCm1HIqWlLNrHGqHGLpGYIhjeHxQjnDXjLT2FyGJDsd3LWMYUo7pAFRrk86CR3nUJfhC81CCoJNNGQ==",
-          "requires": {
-            "bn.js": "^4.11.0",
-            "create-hash": "^1.1.2",
-            "elliptic": "^6.5.2",
-            "ethereum-cryptography": "^0.1.3",
-            "ethjs-util": "^0.1.3",
-            "rlp": "^2.0.0",
-            "safe-buffer": "^5.1.1"
-          }
-        },
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diff --git a/package.json b/package.json
index 955c17777..b1129dffc 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "tokenbridge-contracts",
-  "version": "6.0.0-rc0",
+  "version": "6.0.0-rc1",
   "description": "Bridge",
   "main": "index.js",
   "scripts": {
@@ -20,8 +20,6 @@
   "author": "POA network",
   "license": "GPLv3",
   "dependencies": {
-    "@0x/sol-coverage": "^4.0.10",
-    "@0x/sol-trace": "^3.0.10",
     "@opengsn/gsn": "^2.1.0",
     "array-flat-polyfill": "^1.0.1",
     "openzeppelin-solidity": "1.12.0",
@@ -41,13 +39,12 @@
     "eslint-plugin-node": "^10.0.0",
     "eslint-plugin-prettier": "^3.0.1",
     "eth-gas-reporter": "^0.2.11",
-    "ethereumjs-abi": "0.6.8",
     "ethereumjs-util": "5.2.0",
-    "istanbul": "^0.4.5",
     "nodemon": "^1.17.3",
     "prettier": "^1.18.2",
     "prettier-plugin-solidity": "1.0.0-alpha.32",
     "solhint": "2.2.0",
-    "solhint-plugin-prettier": "0.0.3"
+    "solhint-plugin-prettier": "0.0.3",
+    "solidity-coverage": "0.7.16"
   }
 }
diff --git a/test/arbitrary_message/foreign_bridge.test.js b/test/arbitrary_message/foreign_bridge.test.js
index 2d3516270..e12723e69 100644
--- a/test/arbitrary_message/foreign_bridge.test.js
+++ b/test/arbitrary_message/foreign_bridge.test.js
@@ -38,7 +38,7 @@ contract('ForeignAMB', async accounts => {
 
   before(async () => {
     validatorContract = await BridgeValidators.new()
-    gasTokenContract = await GasToken.new()
+    gasTokenContract = await GasToken.new({ from: accounts[7] })
     authorities = [accounts[1], accounts[2]]
     owner = accounts[0]
     await validatorContract.initialize(1, authorities, owner)
@@ -304,9 +304,7 @@ contract('ForeignAMB', async accounts => {
       bridgeId = web3.utils.soliditySha3(paddedChainId + foreignBridge.address.slice(2)).slice(10, 50)
     })
     it('call requireToPassMessage(address, bytes, uint256)', async () => {
-      const tx = await foreignBridge.methods[
-        'requireToPassMessage(address,bytes,uint256)'
-      ](
+      const tx = await foreignBridge.methods['requireToPassMessage(address,bytes,uint256)'](
         '0xf4BEF13F9f4f2B203FAF0C3cBbaAbe1afE056955',
         '0xb1591967aed668a4b27645ff40c444892d91bf5951b382995d4d4f6ee3a2ce03',
         1535604485,
diff --git a/test/arbitrary_message/home_bridge.test.js b/test/arbitrary_message/home_bridge.test.js
index 5b8b59db2..182c1efcb 100644
--- a/test/arbitrary_message/home_bridge.test.js
+++ b/test/arbitrary_message/home_bridge.test.js
@@ -281,9 +281,7 @@ contract('HomeAMB', async accounts => {
       bridgeId = web3.utils.soliditySha3(paddedChainId + homeBridge.address.slice(2)).slice(10, 50)
     })
     it('call requireToPassMessage(address, bytes, uint256)', async () => {
-      const tx = await homeBridge.methods[
-        'requireToPassMessage(address,bytes,uint256)'
-      ](
+      const tx = await homeBridge.methods['requireToPassMessage(address,bytes,uint256)'](
         '0xf4BEF13F9f4f2B203FAF0C3cBbaAbe1afE056955',
         '0xb1591967aed668a4b27645ff40c444892d91bf5951b382995d4d4f6ee3a2ce03',
         1535604485,
@@ -310,9 +308,7 @@ contract('HomeAMB', async accounts => {
     })
     it('call requireToPassMessage(address, bytes, uint256) should fail', async () => {
       // Should fail because gas < minimumGasUsage
-      await homeBridge.methods[
-        'requireToPassMessage(address,bytes,uint256)'
-      ](
+      await homeBridge.methods['requireToPassMessage(address,bytes,uint256)'](
         '0xf4BEF13F9f4f2B203FAF0C3cBbaAbe1afE056955',
         '0xb1591967aed668a4b27645ff40c444892d91bf5951b382995d4d4f6ee3a2ce03',
         10,
@@ -320,9 +316,7 @@ contract('HomeAMB', async accounts => {
       ).should.be.rejectedWith(ERROR_MSG)
 
       // Should fail because gas > maxGasPerTx
-      await homeBridge.methods[
-        'requireToPassMessage(address,bytes,uint256)'
-      ](
+      await homeBridge.methods['requireToPassMessage(address,bytes,uint256)'](
         '0xf4BEF13F9f4f2B203FAF0C3cBbaAbe1afE056955',
         '0xb1591967aed668a4b27645ff40c444892d91bf5951b382995d4d4f6ee3a2ce03',
         twoEther,
@@ -333,9 +327,7 @@ contract('HomeAMB', async accounts => {
       expect(await homeBridge.maxGasPerTx()).to.be.bignumber.equal(ZERO)
 
       // Should fail because maxGasPerTx = 0 so gas > maxGasPerTx
-      await homeBridge.methods[
-        'requireToPassMessage(address,bytes,uint256)'
-      ](
+      await homeBridge.methods['requireToPassMessage(address,bytes,uint256)'](
         '0xf4BEF13F9f4f2B203FAF0C3cBbaAbe1afE056955',
         '0xb1591967aed668a4b27645ff40c444892d91bf5951b382995d4d4f6ee3a2ce03',
         oneEther,
@@ -345,9 +337,7 @@ contract('HomeAMB', async accounts => {
       await homeBridge.setMaxGasPerTx(oneEther).should.be.fulfilled
       expect(await homeBridge.maxGasPerTx()).to.be.bignumber.equal(oneEther)
 
-      await homeBridge.methods[
-        'requireToPassMessage(address,bytes,uint256)'
-      ](
+      await homeBridge.methods['requireToPassMessage(address,bytes,uint256)'](
         '0xf4BEF13F9f4f2B203FAF0C3cBbaAbe1afE056955',
         '0xb1591967aed668a4b27645ff40c444892d91bf5951b382995d4d4f6ee3a2ce03',
         oneEther,
diff --git a/test/coverage.test.js b/test/coverage.test.js
deleted file mode 100644
index 186e0e959..000000000
--- a/test/coverage.test.js
+++ /dev/null
@@ -1,5 +0,0 @@
-after(async () => {
-  if (process.env.SOLIDITY_COVERAGE === 'true') {
-    await global.coverageSubprovider.writeCoverageAsync()
-  }
-})
diff --git a/test/docker-compose.yml b/test/docker-compose.yml
index 27d5bd878..762cd57e7 100644
--- a/test/docker-compose.yml
+++ b/test/docker-compose.yml
@@ -2,7 +2,12 @@ version: '3.8'
 services:
   ganache:
     image: trufflesuite/ganache-cli
-    command: --deterministic --gasLimit 20000000 --allowUnlimitedContractSize --chainId 1337
+    command: >
+      --deterministic
+      --gasLimit 20000000
+      --allowUnlimitedContractSize
+      --networkId 1337
+      --chainId 1337
     ports:
     - 8545:8545
   compound:
@@ -10,3 +15,7 @@ services:
     # build: compound
     stdin_open: true
     tty: true
+    environment:
+      - PROVIDER
+    extra_hosts:
+      - "host.docker.internal:host-gateway"
diff --git a/test/erc_to_native/foreign_bridge_gsn.test.js b/test/erc_to_native/foreign_bridge_gsn.test.js
index 92e10faa2..0f177c92f 100644
--- a/test/erc_to_native/foreign_bridge_gsn.test.js
+++ b/test/erc_to_native/foreign_bridge_gsn.test.js
@@ -13,7 +13,7 @@ const TokenPaymaster = artifacts.require('TokenPaymaster.sol')
 const { RelayProvider } = require('@opengsn/gsn')
 const { GsnTestEnvironment } = require('@opengsn/gsn/dist/GsnTestEnvironment')
 
-const { toBN, ERROR_MSG } = require('../setup')
+const { toBN, ERROR_MSG, ZERO_ADDRESS } = require('../setup')
 const {
   createMessage,
   sign,
@@ -47,6 +47,7 @@ contract('ForeignBridge_ERC20_to_Native_GSN', async accounts => {
   let authorities
   let owner
   let token
+  let foreignBridge
   let otherSideBridge
 
   let router
@@ -55,7 +56,7 @@ contract('ForeignBridge_ERC20_to_Native_GSN', async accounts => {
   let ForwarderAddress
   before(async () => {
     // Deploy GSN
-    const env = await GsnTestEnvironment.startGsn('localhost')
+    const env = await GsnTestEnvironment.startGsn(web3.currentProvider.host)
     RelayHubAddress = env.contractsDeployment.relayHubAddress
     ForwarderAddress = env.contractsDeployment.forwarderAddress
 
@@ -69,11 +70,33 @@ contract('ForeignBridge_ERC20_to_Native_GSN', async accounts => {
   after(async () => {
     await GsnTestEnvironment.stopGsn()
   })
+  describe('#initialize', async () => {
+    it('should initialize', async () => {
+      token = await ERC677BridgeToken.new('Some ERC20', 'RSZT', 18)
+      router = await UniswapRouterMock.new()
+      foreignBridge = await ForeignBridgeErcToNativeMock.new()
+
+      paymaster = await TokenPaymaster.new(
+        RelayHubAddress,
+        ForwarderAddress,
+        ZERO_ADDRESS,
+        router.address,
+        ZERO_ADDRESS,
+        { from: owner }
+      )
+
+      await paymaster.setToken(token.address, { from: accounts[1] }).should.be.rejected
+
+      await paymaster.setToken(token.address, { from: owner }).should.be.fulfilled
+      await paymaster.setRouter(router.address, { from: owner }).should.be.fulfilled
+      await paymaster.setBridge(foreignBridge.address, { from: owner }).should.be.fulfilled
+    })
+  })
+
   describe('#executeSignaturesGSN', async () => {
     const BRIDGE_TOKENS = ether('300')
     const REQUESTED_TOKENS = BRIDGE_TOKENS
 
-    let foreignBridge
     let GSNRelayer
     let GSNSigner
     beforeEach(async () => {
@@ -165,11 +188,11 @@ contract('ForeignBridge_ERC20_to_Native_GSN', async accounts => {
             gas: GSNGasLimit
           })
         },
-        async () => token.balanceOf(recipientAccount),
-        async () => toBN(await web3.eth.getBalance(recipientAccount)),
-        async () => token.balanceOf(foreignBridge.address),
-        async () => token.balanceOf(paymaster.address),
-        async () => paymaster.getRelayHubDeposit()
+        () => token.balanceOf(recipientAccount),
+        () => web3.eth.getBalance(recipientAccount).then(toBN),
+        () => token.balanceOf(foreignBridge.address),
+        () => token.balanceOf(paymaster.address),
+        () => paymaster.getRelayHubDeposit()
       )
 
       userEthBalanceBefore.should.be.bignumber.equal(ZERO)
diff --git a/test/helpers/eip712.sign.permit.js b/test/helpers/eip712.sign.permit.js
deleted file mode 100644
index 6d46b49bc..000000000
--- a/test/helpers/eip712.sign.permit.js
+++ /dev/null
@@ -1,119 +0,0 @@
-const abi = require('ethereumjs-abi')
-const ethUtil = require('ethereumjs-util')
-
-const domainSchema = [
-  { name: 'name', type: 'string' },
-  { name: 'version', type: 'string' },
-  { name: 'chainId', type: 'uint256' },
-  { name: 'verifyingContract', type: 'address' }
-]
-
-const permitSchema = [
-  { name: 'holder', type: 'address' },
-  { name: 'spender', type: 'address' },
-  { name: 'nonce', type: 'uint256' },
-  { name: 'expiry', type: 'uint256' },
-  { name: 'allowed', type: 'bool' }
-]
-
-const types = {
-  EIP712Domain: domainSchema,
-  Permit: permitSchema
-}
-
-function dependencies(primaryType, found = []) {
-  if (found.includes(primaryType)) {
-    return found
-  }
-  if (types[primaryType] === undefined) {
-    return found
-  }
-  found.push(primaryType)
-  for (const field of types[primaryType]) {
-    for (const dep of dependencies(field.type, found)) {
-      if (!found.includes(dep)) {
-        found.push(dep)
-      }
-    }
-  }
-  return found
-}
-
-function encodeData(primaryType, data) {
-  const encTypes = []
-  const encValues = []
-
-  // Add typehash
-  encTypes.push('bytes32')
-  encValues.push(typeHash(primaryType))
-
-  // Add field contents
-  for (const field of types[primaryType]) {
-    let value = data[field.name]
-    if (field.type === 'string' || field.type === 'bytes') {
-      encTypes.push('bytes32')
-      value = ethUtil.keccak256(value)
-      encValues.push(value)
-    } else if (types[field.type] !== undefined) {
-      encTypes.push('bytes32')
-      value = ethUtil.keccak256(encodeData(field.type, value))
-      encValues.push(value)
-    } else if (field.type.lastIndexOf(']') === field.type.length - 1) {
-      throw Error('TODO: Arrays currently unimplemented in encodeData')
-    } else {
-      encTypes.push(field.type)
-      encValues.push(value)
-    }
-  }
-
-  return abi.rawEncode(encTypes, encValues)
-}
-
-function encodeType(primaryType) {
-  // Get dependencies primary first, then alphabetical
-  let deps = dependencies(primaryType)
-  deps = deps.filter(t => t !== primaryType)
-  deps = [primaryType].concat(deps.sort())
-
-  // Format as a string with fields
-  let result = ''
-  for (const type of deps) {
-    result += `${type}(${types[type].map(({ name, type }) => `${type} ${name}`).join(',')})`
-  }
-  return result
-}
-
-function signHash(typedData) {
-  return ethUtil.keccak256(
-    Buffer.concat([
-      Buffer.from('1901', 'hex'),
-      structHash('EIP712Domain', typedData.domain),
-      structHash(typedData.primaryType, typedData.message)
-    ])
-  )
-}
-
-function structHash(primaryType, data) {
-  return ethUtil.keccak256(encodeData(primaryType, data))
-}
-
-function typeHash(primaryType) {
-  return ethUtil.keccak256(encodeType(primaryType))
-}
-
-function sign(domain, message, privateKey) {
-  const typedData = {
-    types,
-    primaryType: 'Permit',
-    domain,
-    message
-  }
-  const sig = ethUtil.ecsign(signHash(typedData), ethUtil.toBuffer(privateKey))
-  return {
-    v: sig.v,
-    r: ethUtil.bufferToHex(sig.r),
-    s: ethUtil.bufferToHex(sig.s)
-  }
-}
-
-module.exports = sign
diff --git a/test/poa20_test.js b/test/poa20_test.js
index 88d58deef..8d237971c 100644
--- a/test/poa20_test.js
+++ b/test/poa20_test.js
@@ -8,14 +8,33 @@ const ForeignBridge = artifacts.require('ForeignBridgeErcToNative.sol')
 const BridgeValidators = artifacts.require('BridgeValidators.sol')
 
 const { expect } = require('chai')
-const ethUtil = require('ethereumjs-util')
+const { fromRpcSig } = require('ethereumjs-util')
 
 const { ERROR_MSG, ERROR_MSG_OPCODE, ZERO_ADDRESS, BN, toBN } = require('./setup')
 const { ether, expectEventInLogs } = require('./helpers/helpers')
-const permitSign = require('./helpers/eip712.sign.permit')
+
+async function ethSignTypedData(from, data) {
+  const result = await new Promise((res, rej) =>
+    web3.currentProvider.send(
+      { jsonrpc: '2.0', method: 'eth_signTypedData', params: [from, data], id: 1 },
+      (err, sig) => (err ? rej(err) : res(sig))
+    )
+  )
+  const sig = fromRpcSig(result.result)
+  return [sig.v, sig.r, sig.s]
+}
+
+async function evmIncreaseTime(delta) {
+  return new Promise((res, rej) =>
+    web3.currentProvider.send({ jsonrpc: '2.0', method: 'evm_increaseTime', params: [delta], id: 1 }, (err, sig) =>
+      err ? rej(err) : res(sig)
+    )
+  )
+}
 
 const minPerTx = ether('0.01')
 const oneEther = ether('1')
+const twoEthers = ether('2')
 const ZERO = new BN(0)
 
 function testERC677BridgeToken(accounts, rewardable, permittable, createToken) {
@@ -40,7 +59,7 @@ function testERC677BridgeToken(accounts, rewardable, permittable, createToken) {
   beforeEach(async () => {
     const args = ['POA ERC20 Foundation', 'POA20', 18]
     if (permittable) {
-      args.push(100)
+      args.push(1337)
     }
     token = await createToken(args)
   })
@@ -507,340 +526,243 @@ function testERC677BridgeToken(accounts, rewardable, permittable, createToken) {
   })
   if (permittable) {
     describe('permit', () => {
-      const privateKey = '0x2bdd21761a483f71054e14f5b827213567971c676928d9a1808cbfa4b7501210'
-      const infinite = new BN('ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff', 16)
-      let holder
-      let spender
-      let nonce
-      let expiry
-      let allowed
-
-      beforeEach(async () => {
-        holder = '0x040b798028e9abded00Bfc65e7CF01484013db17'
-        spender = accounts[9]
-        nonce = await token.nonces.call(holder)
-        expiry = 0
-        allowed = true
-
-        holder.toLowerCase().should.be.equal(ethUtil.bufferToHex(ethUtil.privateToAddress(privateKey)).toLowerCase()) // make sure privateKey is holder's key
-
-        // Mint some extra tokens for the `holder`
-        await token.mint(holder, '10000', { from: owner }).should.be.fulfilled
-        ;(await token.balanceOf.call(holder)).should.be.bignumber.equal(new BN('10000'))
-        web3.eth.accounts.wallet.add(privateKey)
-        await web3.eth.sendTransaction({ from: owner, to: holder, value: oneEther })
-      })
-      it('should permit', async () => {
-        // Holder signs the `permit` params with their privateKey
-        const signature = permitSign(
-          {
-            name: await token.name.call(),
-            version: await token.version.call(),
-            chainId: '100',
-            verifyingContract: token.address
-          },
-          {
-            holder,
-            spender,
-            nonce,
-            expiry,
-            allowed
-          },
-          privateKey
-        )
-
-        ;(await token.allowance.call(holder, spender)).should.be.bignumber.equal(new BN('0'))
-
-        // An arbitrary address calls the `permit` function
-        const { logs } = await token.permit(
-          holder,
-          spender,
+      const EIP712Domain = [
+        { name: 'name', type: 'string' },
+        { name: 'version', type: 'string' },
+        { name: 'chainId', type: 'uint256' },
+        { name: 'verifyingContract', type: 'address' }
+      ]
+      let domain
+      let permit
+      let permitLegacy
+
+      const makeLegacyMsg = (nonce, expiry, allowed) => ({
+        types: {
+          EIP712Domain,
+          Permit: [
+            { name: 'holder', type: 'address' },
+            { name: 'spender', type: 'address' },
+            { name: 'nonce', type: 'uint256' },
+            { name: 'expiry', type: 'uint256' },
+            { name: 'allowed', type: 'bool' }
+          ]
+        },
+        primaryType: 'Permit',
+        domain,
+        message: {
+          holder: owner,
+          spender: user,
           nonce,
           expiry,
-          allowed,
-          signature.v,
-          signature.r,
-          signature.s
-        ).should.be.fulfilled
-
-        logs[0].event.should.be.equal('Approval')
-        logs[0].args.owner.should.be.equal(holder)
-        logs[0].args.spender.should.be.equal(spender)
-        logs[0].args.value.should.be.bignumber.equal(infinite)
-
-        // Now allowance is infinite
-        ;(await token.allowance.call(holder, spender)).should.be.bignumber.equal(infinite)
-
-        // The caller of `permit` can't spend holder's funds
-        await token.transferFrom(holder, accounts[9], '10000').should.be.rejected
-        ;(await token.balanceOf.call(holder)).should.be.bignumber.equal(new BN('10000'))
-
-        // Spender can transfer all holder's funds
-        await token.transferFrom(holder, accounts[9], '10000', { from: spender }).should.be.fulfilled
-        ;(await token.balanceOf.call(holder)).should.be.bignumber.equal(new BN('0'))
-        ;(await token.balanceOf.call(accounts[9])).should.be.bignumber.equal(new BN('10000'))
-        ;(await token.nonces.call(holder)).should.be.bignumber.equal(nonce.add(new BN('1')))
-
-        // The allowance is still infinite after transfer
-        ;(await token.allowance.call(holder, spender)).should.be.bignumber.equal(infinite)
-      })
-      it('should fail when invalid expiry', async () => {
-        expiry = 900
-
-        const signature = permitSign(
-          {
-            name: await token.name.call(),
-            version: await token.version.call(),
-            chainId: '100',
-            verifyingContract: token.address
-          },
-          {
-            holder,
-            spender,
-            nonce,
-            expiry,
-            allowed
-          },
-          privateKey
-        )
-
-        await token.setNow(1000).should.be.fulfilled
-        await token
-          .permit(holder, spender, nonce, expiry, allowed, signature.v, signature.r, signature.s)
-          .should.be.rejectedWith(ERROR_MSG)
-
-        await token.setNow(800).should.be.fulfilled
-        await token.permit(holder, spender, nonce, expiry, allowed, signature.v, signature.r, signature.s).should.be
-          .fulfilled
-      })
-      it('should consider expiry', async () => {
-        expiry = 900
-
-        const signature = permitSign(
-          {
-            name: await token.name.call(),
-            version: await token.version.call(),
-            chainId: '100',
-            verifyingContract: token.address
-          },
-          {
-            holder,
-            spender,
-            nonce,
-            expiry,
-            allowed
-          },
-          privateKey
-        )
-
-        await token.setNow(800).should.be.fulfilled
-        await token.permit(holder, spender, nonce, expiry, allowed, signature.v, signature.r, signature.s).should.be
-          .fulfilled
-        ;(await token.expirations.call(holder, spender)).should.be.bignumber.equal(new BN(expiry))
-
-        // Spender can transfer holder's funds
-        await token.setNow(899).should.be.fulfilled
-        await token.transferFrom(holder, accounts[9], '6000', { from: spender }).should.be.fulfilled
-        ;(await token.balanceOf.call(holder)).should.be.bignumber.equal(new BN('4000'))
-        ;(await token.balanceOf.call(accounts[9])).should.be.bignumber.equal(new BN('6000'))
-
-        // Spender can't transfer the remaining holder's funds because of expiry
-        await token.setNow(901).should.be.fulfilled
-        await token.transferFrom(holder, accounts[9], '4000', { from: spender }).should.be.rejectedWith(ERROR_MSG)
-      })
-      it('should reset expiration on subsequent approve', async () => {
-        expiry = 900
-        const signature = permitSign(
-          {
-            name: await token.name.call(),
-            version: await token.version.call(),
-            chainId: '100',
-            verifyingContract: token.address
-          },
-          {
-            holder,
-            spender,
-            nonce,
-            expiry,
-            allowed
-          },
-          privateKey
-        )
-        await token.setNow(800).should.be.fulfilled
-        await token.permit(holder, spender, nonce, expiry, allowed, signature.v, signature.r, signature.s).should.be
-          .fulfilled
-        ;(await token.expirations.call(holder, spender)).should.be.bignumber.equal(new BN(expiry))
-        const data = await token.contract.methods.approve(spender, infinite).encodeABI()
-        await web3.eth.sendTransaction({ from: holder, to: token.address, data, gas: 100000 }).should.be.fulfilled
-        ;(await token.expirations.call(holder, spender)).should.be.bignumber.equal(ZERO)
+          allowed
+        }
       })
-      it('should reset expiration on subsequent increaseAllowance', async () => {
-        expiry = 900
-        const signature = permitSign(
-          {
-            name: await token.name.call(),
-            version: await token.version.call(),
-            chainId: '100',
-            verifyingContract: token.address
-          },
-          {
-            holder,
-            spender,
-            nonce,
-            expiry,
-            allowed
-          },
-          privateKey
-        )
-        await token.setNow(800).should.be.fulfilled
-        await token.permit(holder, spender, nonce, expiry, allowed, signature.v, signature.r, signature.s).should.be
-          .fulfilled
-        ;(await token.expirations.call(holder, spender)).should.be.bignumber.equal(new BN(expiry))
-        let data = await token.contract.methods.approve(spender, infinite.sub(toBN(1))).encodeABI()
-        await web3.eth.sendTransaction({ from: holder, to: token.address, data, gas: 100000 }).should.be.fulfilled
-        ;(await token.expirations.call(holder, spender)).should.be.bignumber.equal(new BN(expiry))
-        data = await token.contract.methods.increaseAllowance(spender, 1).encodeABI()
-        await web3.eth.sendTransaction({ from: holder, to: token.address, data, gas: 100000 }).should.be.fulfilled
-        ;(await token.expirations.call(holder, spender)).should.be.bignumber.equal(ZERO)
+      const makeMsg = (nonce, deadline, value) => ({
+        types: {
+          EIP712Domain,
+          Permit: [
+            { name: 'owner', type: 'address' },
+            { name: 'spender', type: 'address' },
+            { name: 'value', type: 'uint256' },
+            { name: 'nonce', type: 'uint256' },
+            { name: 'deadline', type: 'uint256' }
+          ]
+        },
+        primaryType: 'Permit',
+        domain,
+        message: {
+          owner,
+          spender: user,
+          value: value || oneEther.toString(),
+          nonce,
+          deadline
+        }
       })
-      it('should disallow unlimited allowance', async () => {
-        expiry = 900
-        await token.setNow(800).should.be.fulfilled
-
-        let signature = permitSign(
-          {
-            name: await token.name.call(),
-            version: await token.version.call(),
-            chainId: '100',
-            verifyingContract: token.address
-          },
-          {
-            holder,
-            spender,
-            nonce,
-            expiry,
-            allowed
-          },
-          privateKey
-        )
-
-        await token.permit(holder, spender, nonce, expiry, allowed, signature.v, signature.r, signature.s).should.be
-          .fulfilled
-        ;(await token.allowance.call(holder, spender)).should.be.bignumber.equal(infinite)
-        ;(await token.expirations.call(holder, spender)).should.be.bignumber.equal(new BN(expiry))
-
-        // Spender can transfer holder's funds
-        await token.transferFrom(holder, accounts[9], '6000', { from: spender }).should.be.fulfilled
-        ;(await token.balanceOf.call(holder)).should.be.bignumber.equal(new BN('4000'))
-        ;(await token.balanceOf.call(accounts[9])).should.be.bignumber.equal(new BN('6000'))
-
-        nonce = nonce - 0 + 1
-        allowed = false
-
-        signature = permitSign(
-          {
-            name: await token.name.call(),
-            version: await token.version.call(),
-            chainId: '100',
-            verifyingContract: token.address
-          },
-          {
-            holder,
-            spender,
-            nonce,
-            expiry,
-            allowed
-          },
-          privateKey
-        )
-
-        await token.permit(holder, spender, nonce, expiry, allowed, signature.v, signature.r, signature.s).should.be
-          .fulfilled
-        ;(await token.allowance.call(holder, spender)).should.be.bignumber.equal(new BN('0'))
-        ;(await token.expirations.call(holder, spender)).should.be.bignumber.equal(new BN('0'))
-
-        // Spender can't transfer the remaining holder's funds because of zero allowance
-        await token.transferFrom(holder, accounts[9], '4000', { from: spender }).should.be.rejected
+
+      beforeEach(() => {
+        domain = {
+          name: 'POA ERC20 Foundation',
+          version: '1',
+          chainId: 1337,
+          verifyingContract: token.address
+        }
+        permit = token.methods['permit(address,address,uint256,uint256,uint8,bytes32,bytes32)']
+        permitLegacy = token.methods['permit(address,address,uint256,uint256,bool,uint8,bytes32,bytes32)']
       })
-      it('should fail when invalid signature or parameters', async () => {
-        let signature = permitSign(
-          {
-            name: await token.name.call(),
-            version: await token.version.call(),
-            chainId: '100',
-            verifyingContract: token.address
-          },
-          {
-            holder,
-            spender,
-            nonce,
-            expiry,
-            allowed
-          },
-          privateKey
-        )
-
-        allowed = !allowed
 
-        await token
-          .permit(holder, spender, nonce, expiry, allowed, signature.v, signature.r, signature.s)
-          .should.be.rejectedWith(ERROR_MSG)
+      describe('legacy permit', () => {
+        const INFINITY = new BN('ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff', 16)
 
-        allowed = !allowed
+        it('should accept signed message', async () => {
+          const expiry = 10000000000
+          const sig1 = await ethSignTypedData(owner, makeLegacyMsg(0, 100, true))
+          const sig2 = await ethSignTypedData(owner, makeLegacyMsg(1, expiry, true))
+          const sig3 = await ethSignTypedData(owner, makeLegacyMsg(0, expiry, true))
 
-        await token
-          .permit(
-            holder,
-            spender,
-            nonce,
-            expiry,
-            allowed,
-            signature.v,
-            signature.s, // here should be `signature.r` in a correct case
-            signature.r // here should be `signature.s` in a correct case
-          )
-          .should.be.rejectedWith(ERROR_MSG)
+          await permitLegacy(owner, user, 0, 100, true, ...sig1).should.be.rejected // too small deadline
+          await permitLegacy(owner, user, 0, expiry, true, ...sig2).should.be.rejected // invalid nonce
+          await permitLegacy(owner, user, 1, expiry, true, ...sig2).should.be.rejected // not current nonce
+          await permitLegacy(owner, user, 0, expiry, true, ...sig3).should.be.fulfilled // valid for nonce == 0
+          await permitLegacy(owner, user, 0, expiry, true, ...sig3).should.be.rejected // invalid duplicate, invalid nonce
+          await permitLegacy(owner, user, 1, expiry, true, ...sig3).should.be.rejected // invalid nonce
+          await permitLegacy(user, user, 1, expiry, true, ...sig2).should.be.rejected // invalid sender
+          await permitLegacy(owner, owner, 1, expiry, true, ...sig2).should.be.rejected // invalid receiver
+          await permitLegacy(owner, user, 1, expiry + 1, true, ...sig2).should.be.rejected // invalid expiry
+          await permitLegacy(owner, user, 1, expiry, false, ...sig2).should.be.rejected // invalid allowed
+          await permitLegacy(owner, user, 1, expiry, true, ...sig2).should.be.fulfilled // valid for nonce == 1
+          await permitLegacy(owner, user, 1, expiry, true, ...sig2).should.be.rejected // invalid duplicate, invalid nonce
 
-        signature = permitSign(
-          {
-            name: await token.name.call(),
-            version: await token.version.call(),
-            chainId: '100',
-            verifyingContract: token.address
-          },
-          {
-            holder,
-            spender,
-            nonce: nonce - 0 + 1,
-            expiry,
-            allowed
-          },
-          privateKey
-        )
+          expect(await token.allowance(owner, user)).to.be.bignumber.equal(INFINITY)
+          expect(await token.nonces(owner)).to.be.bignumber.equal('2')
+          expect(await token.expirations(owner, user)).to.be.bignumber.equal(toBN(expiry))
+        })
 
-        await token
-          .permit(holder, spender, nonce - 0 + 1, expiry, allowed, signature.v, signature.r, signature.s)
-          .should.be.rejectedWith(ERROR_MSG)
+        it('should cancel expirations on infinite approval from approve()', async () => {
+          const expiry = 10000000000
+          const sig = await ethSignTypedData(owner, makeLegacyMsg(0, expiry, true))
+          await permitLegacy(owner, user, 0, expiry, true, ...sig).should.be.fulfilled
+
+          expect(await token.allowance(owner, user)).to.be.bignumber.equal(INFINITY)
+          expect(await token.expirations(owner, user)).to.be.bignumber.equal(toBN(expiry))
+
+          await token.approve(user, 1).should.be.fulfilled
+
+          expect(await token.allowance(owner, user)).to.be.bignumber.equal('1')
+          expect(await token.expirations(owner, user)).to.be.bignumber.equal(toBN(expiry))
+
+          await token.approve(user, INFINITY).should.be.fulfilled
+
+          expect(await token.allowance(owner, user)).to.be.bignumber.equal(INFINITY)
+          expect(await token.expirations(owner, user)).to.be.bignumber.equal(ZERO)
+        })
+
+        it('should cancel expirations on infinite approval from increaseAllowance()', async () => {
+          const expiry = 10000000000
+          const sig = await ethSignTypedData(owner, makeLegacyMsg(0, expiry, true))
+          await permitLegacy(owner, user, 0, expiry, true, ...sig).should.be.fulfilled
+
+          expect(await token.allowance(owner, user)).to.be.bignumber.equal(INFINITY)
+          expect(await token.expirations(owner, user)).to.be.bignumber.equal(toBN(expiry))
+
+          await token.approve(user, 1).should.be.fulfilled
+
+          expect(await token.allowance(owner, user)).to.be.bignumber.equal('1')
+          expect(await token.expirations(owner, user)).to.be.bignumber.equal(toBN(expiry))
+
+          await token.increaseAllowance(user, 1).should.be.fulfilled
+
+          expect(await token.allowance(owner, user)).to.be.bignumber.equal('2')
+          expect(await token.expirations(owner, user)).to.be.bignumber.equal(toBN(expiry))
+
+          await token.increaseAllowance(user, INFINITY.subn(2)).should.be.fulfilled
+
+          expect(await token.allowance(owner, user)).to.be.bignumber.equal(INFINITY)
+          expect(await token.expirations(owner, user)).to.be.bignumber.equal(ZERO)
+        })
+
+        it('should cancel expirations on infinite approval from permit()', async () => {
+          const expiry = 10000000000
+          const sig1 = await ethSignTypedData(owner, makeLegacyMsg(0, expiry, true))
+          const sig2 = await ethSignTypedData(owner, makeMsg(1, expiry))
+          const sig3 = await ethSignTypedData(owner, makeMsg(2, expiry, INFINITY.toString()))
+          await permitLegacy(owner, user, 0, expiry, true, ...sig1).should.be.fulfilled
+
+          expect(await token.allowance(owner, user)).to.be.bignumber.equal(INFINITY)
+          expect(await token.expirations(owner, user)).to.be.bignumber.equal(toBN(expiry))
+
+          await permit(owner, user, oneEther, expiry, ...sig2).should.be.fulfilled
+
+          expect(await token.allowance(owner, user)).to.be.bignumber.equal(oneEther)
+          expect(await token.expirations(owner, user)).to.be.bignumber.equal(toBN(expiry))
+
+          await permit(owner, user, INFINITY, expiry, ...sig3).should.be.fulfilled
+
+          expect(await token.allowance(owner, user)).to.be.bignumber.equal(INFINITY)
+          expect(await token.expirations(owner, user)).to.be.bignumber.equal(ZERO)
+        })
+
+        it('should cancel approval when allowed is false', async () => {
+          const expiry = 10000000000
+          const sig1 = await ethSignTypedData(owner, makeLegacyMsg(0, expiry, true))
+          const sig2 = await ethSignTypedData(owner, makeLegacyMsg(1, expiry, false))
+          await permitLegacy(owner, user, 0, expiry, true, ...sig1).should.be.fulfilled
+
+          expect(await token.allowance(owner, user)).to.be.bignumber.equal(INFINITY)
+          expect(await token.expirations(owner, user)).to.be.bignumber.equal(toBN(expiry))
+
+          await permitLegacy(owner, user, 1, expiry, false, ...sig2).should.be.fulfilled
+
+          expect(await token.allowance(owner, user)).to.be.bignumber.equal(ZERO)
+          expect(await token.expirations(owner, user)).to.be.bignumber.equal(ZERO)
+        })
+
+        it('should accept infinite approval without deadline', async () => {
+          const sig1 = await ethSignTypedData(owner, makeLegacyMsg(0, 0, true))
+          const sig2 = await ethSignTypedData(owner, makeLegacyMsg(1, 0, false))
+          await permitLegacy(owner, user, 0, 0, true, ...sig1).should.be.fulfilled
+
+          expect(await token.allowance(owner, user)).to.be.bignumber.equal(INFINITY)
+          expect(await token.expirations(owner, user)).to.be.bignumber.equal(ZERO)
+
+          await permitLegacy(owner, user, 1, 0, false, ...sig2).should.be.fulfilled
+
+          expect(await token.allowance(owner, user)).to.be.bignumber.equal(ZERO)
+          expect(await token.expirations(owner, user)).to.be.bignumber.equal(ZERO)
+        })
+
+        it('should allow to use allowance without deadline', async () => {
+          await token.mint(owner, ether('10')).should.be.fulfilled
+          const sig = await ethSignTypedData(owner, makeLegacyMsg(0, 0, true))
+          await permitLegacy(owner, user, 0, 0, true, ...sig).should.be.fulfilled
+
+          await token.transferFrom(owner, user, oneEther, { from: user }).should.be.fulfilled
+          expect(await token.allowance(owner, user)).to.be.bignumber.equal(INFINITY)
+          expect(await token.balanceOf(user)).to.be.bignumber.equal(oneEther)
+          expect(await token.balanceOf(owner)).to.be.bignumber.equal(ether('9'))
+        })
+
+        it('should not allow to use approval after deadline', async () => {
+          await token.mint(owner, ether('10')).should.be.fulfilled
+          const expiry = 10000000000
+          const sig = await ethSignTypedData(owner, makeLegacyMsg(0, expiry, true))
+          await permitLegacy(owner, user, 0, expiry, true, ...sig).should.be.fulfilled
+
+          await token.transferFrom(owner, user, oneEther, { from: user }).should.be.fulfilled
+
+          expect(await token.allowance(owner, user)).to.be.bignumber.equal(INFINITY)
+          expect(await token.balanceOf(user)).to.be.bignumber.equal(oneEther)
+          expect(await token.balanceOf(owner)).to.be.bignumber.equal(ether('9'))
+
+          await evmIncreaseTime(expiry)
+
+          await token.transferFrom(owner, user, oneEther, { from: user }).should.be.rejected
+          expect(await token.allowance(owner, user)).to.be.bignumber.equal(INFINITY)
+          expect(await token.balanceOf(user)).to.be.bignumber.equal(oneEther)
+          expect(await token.balanceOf(owner)).to.be.bignumber.equal(ether('9'))
+        })
+      })
 
-        signature = permitSign(
-          {
-            name: await token.name.call(),
-            version: await token.version.call(),
-            chainId: '100',
-            verifyingContract: token.address
-          },
-          {
-            holder,
-            spender,
-            nonce,
-            expiry,
-            allowed
-          },
-          privateKey
-        )
-
-        await token.permit(holder, spender, nonce, expiry, allowed, signature.v, signature.r, signature.s).should.be
-          .fulfilled
+      describe('ERC2612', () => {
+        it('should accept signed message', async () => {
+          const deadline = 100000000000
+          const sig1 = await ethSignTypedData(owner, makeMsg(0, 100))
+          const sig2 = await ethSignTypedData(owner, makeMsg(1, deadline))
+          const sig3 = await ethSignTypedData(owner, makeMsg(0, deadline))
+
+          await permit(owner, user, oneEther, 100, ...sig1).should.be.rejected // too small deadline
+          await permit(owner, user, oneEther, deadline, ...sig2).should.be.rejected // invalid nonce
+          await permit(owner, user, oneEther, deadline, ...sig3).should.be.fulfilled // valid for nonce == 0
+          await permit(owner, user, oneEther, deadline, ...sig3).should.be.rejected // invalid duplicate, invalid nonce
+          await permit(user, user, oneEther, deadline, ...sig2).should.be.rejected // invalid sender
+          await permit(owner, owner, oneEther, deadline, ...sig2).should.be.rejected // invalid receiver
+          await permit(owner, user, twoEthers, deadline, ...sig2).should.be.rejected // invalud value
+          await permit(owner, user, oneEther, deadline + 1, ...sig2).should.be.rejected // invalid deadline
+          await permit(owner, user, oneEther, deadline, ...sig2).should.be.fulfilled // valid for nonce == 1
+          await permit(owner, user, oneEther, deadline, ...sig2).should.be.rejected // invalid duplicate, invalid nonce
+          expect(await token.allowance(owner, user)).to.be.bignumber.equal(oneEther)
+          expect(await token.nonces(owner)).to.be.bignumber.equal('2')
+          expect(await token.expirations(owner, user)).to.be.bignumber.equal(ZERO)
+        })
       })
     })
   }
diff --git a/test/test.sh b/test/test.sh
index 29968ce18..a5c2c999c 100755
--- a/test/test.sh
+++ b/test/test.sh
@@ -15,18 +15,28 @@ ganache_running() {
   nc -z localhost 8545
 }
 
-if ganache_running; then
-  echo "Using existing ganache instance"
-else
-  echo "Starting our own ganache instance"
-  docker-compose -f test/docker-compose.yml up -d ganache
-  sleep 5
+if [ "$SOLIDITY_COVERAGE" = true ]; then
+  node --max-old-space-size=4096 node_modules/.bin/truffle run coverage --network ganache 2>/dev/null &
+  pid=$!
+
+  echo "Waiting in-process ganache to launch on port 8545"
+  while ! ganache_running; do
+    sleep 0.5
+  done
+
   echo "Deploy Compound protocol contracts"
-  docker-compose -f test/docker-compose.yml up compound || true
-fi
+  PROVIDER=http://host.docker.internal:8545 docker-compose -f test/docker-compose.yml up compound || true
 
-if [ "$SOLIDITY_COVERAGE" = true ]; then
-  node --max-old-space-size=4096 node_modules/.bin/truffle test 2>/dev/null; istanbul report lcov
+  wait $pid
 else
+  if ganache_running; then
+    echo "Using existing ganache instance"
+  else
+    echo "Starting our own ganache instance"
+    docker-compose -f test/docker-compose.yml up -d ganache
+    sleep 5
+    echo "Deploy Compound protocol contracts"
+    PROVIDER=http://ganache:8545 docker-compose -f test/docker-compose.yml up compound || true
+  fi
   node_modules/.bin/truffle test --network ganache "$@"
 fi
diff --git a/truffle-config.js b/truffle-config.js
index 04bb4947d..e8d14aafe 100644
--- a/truffle-config.js
+++ b/truffle-config.js
@@ -1,7 +1,3 @@
-const { CoverageSubprovider, Web3ProviderEngine } = require('@0x/sol-coverage')
-const { TruffleArtifactAdapter } = require('@0x/sol-trace')
-const RPCSubprovider = require('web3-provider-engine/subproviders/rpc')
-
 const contractsBuildDirectory = './build/contracts'
 const evmVersion = 'byzantium'
 const mochaOptions =
@@ -15,32 +11,10 @@ const mochaOptions =
       }
     : {}
 
-const projectRoot = ''
-const solcVersion = '0.4.24+commit.e67f0147'
-const defaultFromAddress = '0x5409ed021d9299bf6814279a6a1411a7e866a631'
-const isVerbose = true
-const artifactAdapter = new TruffleArtifactAdapter(projectRoot, solcVersion)
-const provider = new Web3ProviderEngine()
-if (process.env.SOLIDITY_COVERAGE === 'true') {
-  global.coverageSubprovider = new CoverageSubprovider(artifactAdapter, defaultFromAddress, {
-    isVerbose,
-    ignoreFilesGlobs: ['**/Migrations.sol', '**/node_modules/**', '**/mocks/**', '**/interfaces/**', '**/helpers/**']
-  })
-  provider.addProvider(global.coverageSubprovider)
-  provider.addProvider(new RPCSubprovider({ rpcUrl: 'http://localhost:8545' }))
-  provider.start(err => {
-    if (err !== undefined) {
-      process.exit(1)
-    }
-  })
-  provider.send = provider.sendAsync.bind(provider)
-}
-
 module.exports = {
   contracts_build_directory: contractsBuildDirectory,
   networks: {
     development: {
-      provider,
       network_id: '*',
       gas: 10000000,
       disableConfirmationListener: true
@@ -48,7 +22,7 @@ module.exports = {
     ganache: {
       host: '127.0.0.1',
       port: 8545,
-      network_id: '*', // eslint-disable-line camelcase
+      network_id: '1337', // eslint-disable-line camelcase
       gasPrice: 100000000000,
       gas: 10000000,
       disableConfirmationListener: true
@@ -66,5 +40,6 @@ module.exports = {
       }
     }
   },
-  mocha: mochaOptions
+  mocha: mochaOptions,
+  plugins: ['solidity-coverage']
 }
diff --git a/upgrade/.env.example b/upgrade/.env.example
deleted file mode 100644
index 0ae0ac7e8..000000000
--- a/upgrade/.env.example
+++ /dev/null
@@ -1,11 +0,0 @@
-FOREIGN_RPC_URL=https://mainnet.infura.io/v3/API_KEY
-FOREIGN_PRIVKEY=0x...
-FOREIGN_BRIDGE_ADDRESS=0x4aa42145Aa6Ebf72e164C9bBC74fbD3788045016
-FOREIGN_START_BLOCK=9122083
-FOREIGN_GAS_PRICE=1000000000
-
-# leader or confirm
-ROLE=confirm
-
-NEW_IMPLEMENTATION_ETH_BRIDGE=
-SAI_TOKENS_RECEIVER=
diff --git a/upgrade/.eslintrc b/upgrade/.eslintrc
deleted file mode 100644
index 9b35f4dee..000000000
--- a/upgrade/.eslintrc
+++ /dev/null
@@ -1,12 +0,0 @@
-{
-  "extends": ["plugin:node/recommended", "airbnb-base", "plugin:prettier/recommended"],
-  "plugins": ["node"],
-  "env": {
-    "node": true
-  },
-  "rules": {
-    "no-use-before-define": ["error", { "functions": false }],
-    "node/no-unpublished-require": "off",
-    "no-console": "off"
-  }
-}
diff --git a/upgrade/.gitignore b/upgrade/.gitignore
deleted file mode 100644
index 6ed48a986..000000000
--- a/upgrade/.gitignore
+++ /dev/null
@@ -1,2 +0,0 @@
-.env
-node_modules
diff --git a/upgrade/.nvmrc b/upgrade/.nvmrc
deleted file mode 100644
index 223ff9538..000000000
--- a/upgrade/.nvmrc
+++ /dev/null
@@ -1 +0,0 @@
-10.18
diff --git a/upgrade/.prettierrc b/upgrade/.prettierrc
deleted file mode 100644
index 29c575606..000000000
--- a/upgrade/.prettierrc
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  "semi": false,
-  "singleQuote": true,
-  "printWidth": 120,
-  "bracketSpacing": true
-}
diff --git a/upgrade/README.md b/upgrade/README.md
deleted file mode 100644
index 690e34b94..000000000
--- a/upgrade/README.md
+++ /dev/null
@@ -1,24 +0,0 @@
-### How to run upgrade scripts
-
-Install dependencies in root project and compile the contracts
-```bash
-cd ..
-npm i
-npm run compile
-```
-
-Install dependencies from `upgrade` folder
-```bash
-cd upgrade
-npm i
-```
-
-Create `.env` file
-```bash
-cp .env.example .env
-```
-
-Complete the variables in `.env` file. The `ROLE` variable indicates if the validator will send the creation transaction on the multisig wallet or if it will send the confirmation.
-
-Run the script. The following are available:
-* `npm run upgradeBridgeOnForeign`
diff --git a/upgrade/abi/multiSigwallet.json b/upgrade/abi/multiSigwallet.json
deleted file mode 100644
index 4dedfcffd..000000000
--- a/upgrade/abi/multiSigwallet.json
+++ /dev/null
@@ -1,265 +0,0 @@
-[
-  {
-    "constant": true,
-    "inputs": [{ "name": "", "type": "uint256" }],
-    "name": "owners",
-    "outputs": [{ "name": "", "type": "address" }],
-    "payable": false,
-    "type": "function"
-  },
-  {
-    "constant": false,
-    "inputs": [{ "name": "owner", "type": "address" }],
-    "name": "removeOwner",
-    "outputs": [],
-    "payable": false,
-    "type": "function"
-  },
-  {
-    "constant": false,
-    "inputs": [{ "name": "transactionId", "type": "uint256" }],
-    "name": "revokeConfirmation",
-    "outputs": [],
-    "payable": false,
-    "type": "function"
-  },
-  {
-    "constant": true,
-    "inputs": [{ "name": "", "type": "address" }],
-    "name": "isOwner",
-    "outputs": [{ "name": "", "type": "bool" }],
-    "payable": false,
-    "type": "function"
-  },
-  {
-    "constant": true,
-    "inputs": [
-      { "name": "", "type": "uint256" },
-      { "name": "", "type": "address" }
-    ],
-    "name": "confirmations",
-    "outputs": [{ "name": "", "type": "bool" }],
-    "payable": false,
-    "type": "function"
-  },
-  {
-    "constant": true,
-    "inputs": [
-      { "name": "pending", "type": "bool" },
-      { "name": "executed", "type": "bool" }
-    ],
-    "name": "getTransactionCount",
-    "outputs": [{ "name": "count", "type": "uint256" }],
-    "payable": false,
-    "type": "function"
-  },
-  {
-    "constant": false,
-    "inputs": [{ "name": "owner", "type": "address" }],
-    "name": "addOwner",
-    "outputs": [],
-    "payable": false,
-    "type": "function"
-  },
-  {
-    "constant": true,
-    "inputs": [{ "name": "transactionId", "type": "uint256" }],
-    "name": "isConfirmed",
-    "outputs": [{ "name": "", "type": "bool" }],
-    "payable": false,
-    "type": "function"
-  },
-  {
-    "constant": true,
-    "inputs": [{ "name": "transactionId", "type": "uint256" }],
-    "name": "getConfirmationCount",
-    "outputs": [{ "name": "count", "type": "uint256" }],
-    "payable": false,
-    "type": "function"
-  },
-  {
-    "constant": true,
-    "inputs": [{ "name": "", "type": "uint256" }],
-    "name": "transactions",
-    "outputs": [
-      { "name": "destination", "type": "address" },
-      { "name": "value", "type": "uint256" },
-      { "name": "data", "type": "bytes" },
-      { "name": "executed", "type": "bool" }
-    ],
-    "payable": false,
-    "type": "function"
-  },
-  {
-    "constant": true,
-    "inputs": [],
-    "name": "getOwners",
-    "outputs": [{ "name": "", "type": "address[]" }],
-    "payable": false,
-    "type": "function"
-  },
-  {
-    "constant": true,
-    "inputs": [
-      { "name": "from", "type": "uint256" },
-      { "name": "to", "type": "uint256" },
-      { "name": "pending", "type": "bool" },
-      { "name": "executed", "type": "bool" }
-    ],
-    "name": "getTransactionIds",
-    "outputs": [{ "name": "_transactionIds", "type": "uint256[]" }],
-    "payable": false,
-    "type": "function"
-  },
-  {
-    "constant": true,
-    "inputs": [{ "name": "transactionId", "type": "uint256" }],
-    "name": "getConfirmations",
-    "outputs": [{ "name": "_confirmations", "type": "address[]" }],
-    "payable": false,
-    "type": "function"
-  },
-  {
-    "constant": true,
-    "inputs": [],
-    "name": "transactionCount",
-    "outputs": [{ "name": "", "type": "uint256" }],
-    "payable": false,
-    "type": "function"
-  },
-  {
-    "constant": false,
-    "inputs": [{ "name": "_required", "type": "uint256" }],
-    "name": "changeRequirement",
-    "outputs": [],
-    "payable": false,
-    "type": "function"
-  },
-  {
-    "constant": false,
-    "inputs": [{ "name": "transactionId", "type": "uint256" }],
-    "name": "confirmTransaction",
-    "outputs": [],
-    "payable": false,
-    "type": "function"
-  },
-  {
-    "constant": false,
-    "inputs": [
-      { "name": "destination", "type": "address" },
-      { "name": "value", "type": "uint256" },
-      { "name": "data", "type": "bytes" }
-    ],
-    "name": "submitTransaction",
-    "outputs": [{ "name": "transactionId", "type": "uint256" }],
-    "payable": false,
-    "type": "function"
-  },
-  {
-    "constant": true,
-    "inputs": [],
-    "name": "MAX_OWNER_COUNT",
-    "outputs": [{ "name": "", "type": "uint256" }],
-    "payable": false,
-    "type": "function"
-  },
-  {
-    "constant": true,
-    "inputs": [],
-    "name": "required",
-    "outputs": [{ "name": "", "type": "uint256" }],
-    "payable": false,
-    "type": "function"
-  },
-  {
-    "constant": false,
-    "inputs": [
-      { "name": "owner", "type": "address" },
-      { "name": "newOwner", "type": "address" }
-    ],
-    "name": "replaceOwner",
-    "outputs": [],
-    "payable": false,
-    "type": "function"
-  },
-  {
-    "constant": false,
-    "inputs": [{ "name": "transactionId", "type": "uint256" }],
-    "name": "executeTransaction",
-    "outputs": [],
-    "payable": false,
-    "type": "function"
-  },
-  {
-    "inputs": [
-      { "name": "_owners", "type": "address[]" },
-      { "name": "_required", "type": "uint256" }
-    ],
-    "payable": false,
-    "type": "constructor"
-  },
-  { "payable": true, "type": "fallback" },
-  {
-    "anonymous": false,
-    "inputs": [
-      { "indexed": true, "name": "sender", "type": "address" },
-      { "indexed": true, "name": "transactionId", "type": "uint256" }
-    ],
-    "name": "Confirmation",
-    "type": "event"
-  },
-  {
-    "anonymous": false,
-    "inputs": [
-      { "indexed": true, "name": "sender", "type": "address" },
-      { "indexed": true, "name": "transactionId", "type": "uint256" }
-    ],
-    "name": "Revocation",
-    "type": "event"
-  },
-  {
-    "anonymous": false,
-    "inputs": [{ "indexed": true, "name": "transactionId", "type": "uint256" }],
-    "name": "Submission",
-    "type": "event"
-  },
-  {
-    "anonymous": false,
-    "inputs": [{ "indexed": true, "name": "transactionId", "type": "uint256" }],
-    "name": "Execution",
-    "type": "event"
-  },
-  {
-    "anonymous": false,
-    "inputs": [{ "indexed": true, "name": "transactionId", "type": "uint256" }],
-    "name": "ExecutionFailure",
-    "type": "event"
-  },
-  {
-    "anonymous": false,
-    "inputs": [
-      { "indexed": true, "name": "sender", "type": "address" },
-      { "indexed": false, "name": "value", "type": "uint256" }
-    ],
-    "name": "Deposit",
-    "type": "event"
-  },
-  {
-    "anonymous": false,
-    "inputs": [{ "indexed": true, "name": "owner", "type": "address" }],
-    "name": "OwnerAddition",
-    "type": "event"
-  },
-  {
-    "anonymous": false,
-    "inputs": [{ "indexed": true, "name": "owner", "type": "address" }],
-    "name": "OwnerRemoval",
-    "type": "event"
-  },
-  {
-    "anonymous": false,
-    "inputs": [{ "indexed": false, "name": "required", "type": "uint256" }],
-    "name": "RequirementChange",
-    "type": "event"
-  }
-]
diff --git a/upgrade/package-lock.json b/upgrade/package-lock.json
deleted file mode 100644
index b0b59d9cd..000000000
--- a/upgrade/package-lock.json
+++ /dev/null
@@ -1,3879 +0,0 @@
-{
-    "name": "upgrade-xdai",
-    "version": "1.0.0",
-    "lockfileVersion": 1,
-    "requires": true,
-    "dependencies": {
-        "@babel/code-frame": {
-            "version": "7.5.5",
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-            "dev": true,
-            "requires": {
-                "@babel/highlight": "^7.0.0"
-            }
-        },
-        "@babel/highlight": {
-            "version": "7.5.0",
-            "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.5.0.tgz",
-            "integrity": "sha512-7dV4eu9gBxoM0dAnj/BCFDW9LFU0zvTrkq0ugM7pnHEgguOEeOz1so2ZghEdzviYzQEED0r4EAgpsBChKy1TRQ==",
-            "dev": true,
-            "requires": {
-                "chalk": "^2.0.0",
-                "esutils": "^2.0.2",
-                "js-tokens": "^4.0.0"
-            }
-        },
-        "@sindresorhus/is": {
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-            "resolved": "https://registry.npmjs.org/@sindresorhus/is/-/is-0.14.0.tgz",
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-        },
-        "@szmarczak/http-timer": {
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-            "requires": {
-                "@types/node": "*"
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-                "semver": "^6.3.0"
-            }
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diff --git a/upgrade/package.json b/upgrade/package.json
deleted file mode 100644
index 181c7efa9..000000000
--- a/upgrade/package.json
+++ /dev/null
@@ -1,22 +0,0 @@
-{
-    "name": "upgrade-xdai",
-    "version": "1.0.0",
-    "main": "index.js",
-    "license": "GPLv3",
-    "scripts": {
-        "upgradeBridgeOnForeign": "node src/upgradeBridgeOnForeign.js",
-        "lint": "eslint ."
-    },
-    "dependencies": {
-        "dotenv": "^8.2.0",
-        "web3": "^1.2.4"
-    },
-    "devDependencies": {
-        "eslint": "^6.7.2",
-        "eslint-config-airbnb-base": "^14.0.0",
-        "eslint-config-prettier": "^6.7.0",
-        "eslint-plugin-node": "^10.0.0",
-        "eslint-plugin-prettier": "^3.1.2",
-        "prettier": "^1.19.1"
-    }
-}
diff --git a/upgrade/src/upgradeBridgeOnForeign.js b/upgrade/src/upgradeBridgeOnForeign.js
deleted file mode 100644
index 59ae19f46..000000000
--- a/upgrade/src/upgradeBridgeOnForeign.js
+++ /dev/null
@@ -1,50 +0,0 @@
-require('dotenv').config()
-const Web3 = require('web3')
-const multiSigWalletAbi = require('../abi/multiSigwallet')
-const proxyAbi = require('../../build/contracts/EternalStorageProxy').abi
-const bridgeAbi = require('../../build/contracts/ForeignBridgeErcToNative').abi
-const callMultiSigWallet = require('./utils/callMultiSigWallet')
-const validatorState = require('./utils/validatorState')
-
-const {
-  FOREIGN_PRIVKEY,
-  FOREIGN_RPC_URL,
-  FOREIGN_BRIDGE_ADDRESS,
-  ROLE,
-  FOREIGN_START_BLOCK,
-  FOREIGN_GAS_PRICE,
-  NEW_IMPLEMENTATION_ETH_BRIDGE,
-  SAI_TOKENS_RECEIVER
-} = process.env
-
-const web3 = new Web3(new Web3.providers.HttpProvider(FOREIGN_RPC_URL))
-const { address } = web3.eth.accounts.wallet.add(FOREIGN_PRIVKEY)
-
-const upgradeBridgeOnForeign = async () => {
-  try {
-    const proxy = new web3.eth.Contract(proxyAbi, FOREIGN_BRIDGE_ADDRESS)
-    const foreignBridge = new web3.eth.Contract(bridgeAbi, FOREIGN_BRIDGE_ADDRESS)
-    const ownerAddress = await proxy.methods.upgradeabilityOwner().call()
-    const multiSigWallet = new web3.eth.Contract(multiSigWalletAbi, ownerAddress)
-
-    await validatorState(web3, address, multiSigWallet)
-
-    const fixData = foreignBridge.methods.fixLockedSai(SAI_TOKENS_RECEIVER).encodeABI()
-
-    const data = proxy.methods.upgradeToAndCall('6', NEW_IMPLEMENTATION_ETH_BRIDGE, fixData).encodeABI()
-
-    await callMultiSigWallet({
-      role: ROLE,
-      contract: multiSigWallet,
-      destination: FOREIGN_BRIDGE_ADDRESS,
-      fromBlock: FOREIGN_START_BLOCK,
-      gasPrice: FOREIGN_GAS_PRICE,
-      address,
-      data
-    })
-  } catch (e) {
-    console.log(e.message)
-  }
-}
-
-upgradeBridgeOnForeign()
diff --git a/upgrade/src/utils/callMultiSigWallet.js b/upgrade/src/utils/callMultiSigWallet.js
deleted file mode 100644
index 5b58b38f1..000000000
--- a/upgrade/src/utils/callMultiSigWallet.js
+++ /dev/null
@@ -1,68 +0,0 @@
-const { toBN } = require('web3').utils
-
-const confirmTransaction = async ({ contract, fromBlock = 0, destination, data, address, gasPrice }) => {
-  const submissions = await contract.getPastEvents('Submission', { fromBlock, toBlock: 'latest' })
-
-  if (!submissions.length) {
-    throw new Error('No submissions found.')
-  }
-  const filteredSubmission = []
-  await Promise.all(
-    submissions.map(async s => {
-      const { transactionId } = s.returnValues
-      const transaction = await contract.methods.transactions(transactionId).call()
-      if (transaction.destination === destination && transaction.data === data) {
-        if (!transaction.executed) {
-          console.log(
-            `Found a transaction to confirm. Id: ${transactionId}, Block: ${s.blockNumber}, Data: ${transaction.data}`
-          )
-          filteredSubmission.push(s)
-          return
-        }
-        console.log(
-          `Found a transaction that was already executed. Id: ${transactionId}, Block: ${s.blockNumber}, Data: ${transaction.data}`
-        )
-      }
-    })
-  )
-
-  if (filteredSubmission.length > 1) {
-    throw new Error('More than one transaction found.')
-  } else if (filteredSubmission.length === 0) {
-    throw new Error('No transaction to confirm.')
-  }
-  const { transactionId } = filteredSubmission[0].returnValues
-  const estimatedGas = await contract.methods.confirmTransaction(transactionId).estimateGas({ from: address })
-  const gas = addExtraGas(estimatedGas)
-
-  const receipt = await contract.methods.confirmTransaction(transactionId).send({ from: address, gas, gasPrice })
-  console.log(`Confirmation status: ${receipt.status} - Tx Hash: ${receipt.transactionHash}`)
-}
-
-function addExtraGas(initialGas) {
-  const gas = toBN(initialGas)
-  const extraPercentage = toBN(4)
-
-  return gas.mul(extraPercentage)
-}
-
-const callMultiSigWallet = async ({ role, contract, destination, fromBlock, gasPrice, address, data }) => {
-  if (role === 'leader') {
-    const gas = await contract.methods.submitTransaction(destination, 0, data).estimateGas({ from: address })
-    const receipt = await contract.methods
-      .submitTransaction(destination, 0, data)
-      .send({ from: address, gas: addExtraGas(gas), gasPrice })
-    console.log(`Submission status: ${receipt.status} - Tx Hash: ${receipt.transactionHash}`)
-  } else {
-    await confirmTransaction({
-      fromBlock,
-      contract,
-      destination,
-      data,
-      address,
-      gasPrice
-    })
-  }
-}
-
-module.exports = callMultiSigWallet
diff --git a/upgrade/src/utils/validatorState.js b/upgrade/src/utils/validatorState.js
deleted file mode 100644
index 664cc8981..000000000
--- a/upgrade/src/utils/validatorState.js
+++ /dev/null
@@ -1,17 +0,0 @@
-const { toBN } = require('web3').utils
-
-const validatorState = async (web3, address, multiSigWallet) => {
-  const balance = await web3.eth.getBalance(address)
-  console.log(`Validator ${address} balance is ${balance}`)
-  if (toBN(balance).isZero()) {
-    throw new Error(`Balance is zero.`)
-  }
-
-  const isOwner = await multiSigWallet.methods.isOwner(address).call()
-
-  if (!isOwner) {
-    throw new Error(`The validator is not part of the multisig wallet.`)
-  }
-}
-
-module.exports = validatorState