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0x125ab2cA5071b60433d90bCE2dfC8e1E83ADAD2B

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0x761ECeDE...A3527d5c5 at txn 0x6042cf28bee407bb1e3b510b3197689213e8b1c1f53601e03d32c2cb1ccd4477

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Contract Source Code Verified (Exact Match)

Contract Name:

ForeignBridgeErcToErc

Compiler Version

v0.4.24+commit.e67f0147

Optimization Enabled:

Yes with 200 runs

Other Settings:

byzantium EvmVersion

Contract Source Code (Solidity)

IDE

/**
 *Submitted for verification at Etherscan.io on 2021-09-03
*/

// File: contracts/upgradeability/EternalStorage.sol

pragma solidity 0.4.24;

/**
 * @title EternalStorage
 * @dev This contract holds all the necessary state variables to carry out the storage of any contract.
 */
contract EternalStorage {
    mapping(bytes32 => uint256) internal uintStorage;
    mapping(bytes32 => string) internal stringStorage;
    mapping(bytes32 => address) internal addressStorage;
    mapping(bytes32 => bytes) internal bytesStorage;
    mapping(bytes32 => bool) internal boolStorage;
    mapping(bytes32 => int256) internal intStorage;

}

// File: openzeppelin-solidity/contracts/token/ERC20/ERC20Basic.sol

pragma solidity ^0.4.24;


/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * See https://github.com/ethereum/EIPs/issues/179
 */
contract ERC20Basic {
  function totalSupply() public view returns (uint256);
  function balanceOf(address _who) public view returns (uint256);
  function transfer(address _to, uint256 _value) public returns (bool);
  event Transfer(address indexed from, address indexed to, uint256 value);
}

// File: openzeppelin-solidity/contracts/token/ERC20/ERC20.sol

pragma solidity ^0.4.24;



/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20 is ERC20Basic {
  function allowance(address _owner, address _spender)
    public view returns (uint256);

  function transferFrom(address _from, address _to, uint256 _value)
    public returns (bool);

  function approve(address _spender, uint256 _value) public returns (bool);
  event Approval(
    address indexed owner,
    address indexed spender,
    uint256 value
  );
}

// File: contracts/interfaces/IBridgeValidators.sol

pragma solidity 0.4.24;

interface IBridgeValidators {
    function isValidator(address _validator) external view returns (bool);
    function requiredSignatures() external view returns (uint256);
    function owner() external view returns (address);
}

// File: contracts/upgradeable_contracts/ValidatorStorage.sol

pragma solidity 0.4.24;

contract ValidatorStorage {
    bytes32 internal constant VALIDATOR_CONTRACT = 0x5a74bb7e202fb8e4bf311841c7d64ec19df195fee77d7e7ae749b27921b6ddfe; // keccak256(abi.encodePacked("validatorContract"))
}

// File: contracts/upgradeable_contracts/Validatable.sol

pragma solidity 0.4.24;




contract Validatable is EternalStorage, ValidatorStorage {
    function validatorContract() public view returns (IBridgeValidators) {
        return IBridgeValidators(addressStorage[VALIDATOR_CONTRACT]);
    }

    modifier onlyValidator() {
        require(validatorContract().isValidator(msg.sender));
        /* solcov ignore next */
        _;
    }

    function requiredSignatures() public view returns (uint256) {
        return validatorContract().requiredSignatures();
    }

}

// File: contracts/libraries/Message.sol

pragma solidity 0.4.24;


library Message {
    function addressArrayContains(address[] array, address value) internal pure returns (bool) {
        for (uint256 i = 0; i < array.length; i++) {
            if (array[i] == value) {
                return true;
            }
        }
        return false;
    }
    // layout of message :: bytes:
    // offset  0: 32 bytes :: uint256 - message length
    // offset 32: 20 bytes :: address - recipient address
    // offset 52: 32 bytes :: uint256 - value
    // offset 84: 32 bytes :: bytes32 - transaction hash
    // offset 104: 20 bytes :: address - contract address to prevent double spending

    // mload always reads 32 bytes.
    // so we can and have to start reading recipient at offset 20 instead of 32.
    // if we were to read at 32 the address would contain part of value and be corrupted.
    // when reading from offset 20 mload will read 12 bytes (most of them zeros) followed
    // by the 20 recipient address bytes and correctly convert it into an address.
    // this saves some storage/gas over the alternative solution
    // which is padding address to 32 bytes and reading recipient at offset 32.
    // for more details see discussion in:
    // https://github.com/paritytech/parity-bridge/issues/61
    function parseMessage(bytes message)
        internal
        pure
        returns (address recipient, uint256 amount, bytes32 txHash, address contractAddress)
    {
        require(isMessageValid(message));
        assembly {
            recipient := mload(add(message, 20))
            amount := mload(add(message, 52))
            txHash := mload(add(message, 84))
            contractAddress := mload(add(message, 104))
        }
    }

    function isMessageValid(bytes _msg) internal pure returns (bool) {
        return _msg.length == requiredMessageLength();
    }

    function requiredMessageLength() internal pure returns (uint256) {
        return 104;
    }

    function recoverAddressFromSignedMessage(bytes signature, bytes message, bool isAMBMessage)
        internal
        pure
        returns (address)
    {
        require(signature.length == 65);
        bytes32 r;
        bytes32 s;
        bytes1 v;

        assembly {
            r := mload(add(signature, 0x20))
            s := mload(add(signature, 0x40))
            v := mload(add(signature, 0x60))
        }
        require(uint8(v) == 27 || uint8(v) == 28);
        require(uint256(s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0);

        return ecrecover(hashMessage(message, isAMBMessage), uint8(v), r, s);
    }

    function hashMessage(bytes message, bool isAMBMessage) internal pure returns (bytes32) {
        bytes memory prefix = "\x19Ethereum Signed Message:\n";
        if (isAMBMessage) {
            return keccak256(abi.encodePacked(prefix, uintToString(message.length), message));
        } else {
            string memory msgLength = "104";
            return keccak256(abi.encodePacked(prefix, msgLength, message));
        }
    }

    /**
    * @dev Validates provided signatures, only first requiredSignatures() number
    * of signatures are going to be validated, these signatures should be from different validators.
    * @param _message bytes message used to generate signatures
    * @param _signatures bytes blob with signatures to be validated.
    * First byte X is a number of signatures in a blob,
    * next X bytes are v components of signatures,
    * next 32 * X bytes are r components of signatures,
    * next 32 * X bytes are s components of signatures.
    * @param _validatorContract contract, which conforms to the IBridgeValidators interface,
    * where info about current validators and required signatures is stored.
    * @param isAMBMessage true if _message is an AMB message with arbitrary length.
    */
    function hasEnoughValidSignatures(
        bytes _message,
        bytes _signatures,
        IBridgeValidators _validatorContract,
        bool isAMBMessage
    ) internal view {
        require(isAMBMessage || isMessageValid(_message));
        uint256 requiredSignatures = _validatorContract.requiredSignatures();
        uint256 amount;
        assembly {
            amount := and(mload(add(_signatures, 1)), 0xff)
        }
        require(amount >= requiredSignatures);
        bytes32 hash = hashMessage(_message, isAMBMessage);
        address[] memory encounteredAddresses = new address[](requiredSignatures);

        for (uint256 i = 0; i < requiredSignatures; i++) {
            uint8 v;
            bytes32 r;
            bytes32 s;
            uint256 posr = 33 + amount + 32 * i;
            uint256 poss = posr + 32 * amount;
            assembly {
                v := mload(add(_signatures, add(2, i)))
                r := mload(add(_signatures, posr))
                s := mload(add(_signatures, poss))
            }

            address recoveredAddress = ecrecover(hash, v, r, s);
            require(_validatorContract.isValidator(recoveredAddress));
            require(!addressArrayContains(encounteredAddresses, recoveredAddress));
            encounteredAddresses[i] = recoveredAddress;
        }
    }

    function uintToString(uint256 i) internal pure returns (string) {
        if (i == 0) return "0";
        uint256 j = i;
        uint256 length;
        while (j != 0) {
            length++;
            j /= 10;
        }
        bytes memory bstr = new bytes(length);
        uint256 k = length - 1;
        while (i != 0) {
            bstr[k--] = bytes1(48 + (i % 10));
            i /= 10;
        }
        return string(bstr);
    }
}

// File: contracts/upgradeable_contracts/MessageRelay.sol

pragma solidity 0.4.24;


contract MessageRelay is EternalStorage {
    function relayedMessages(bytes32 _txHash) public view returns (bool) {
        return boolStorage[keccak256(abi.encodePacked("relayedMessages", _txHash))];
    }

    function setRelayedMessages(bytes32 _txHash, bool _status) internal {
        boolStorage[keccak256(abi.encodePacked("relayedMessages", _txHash))] = _status;
    }
}

// File: contracts/interfaces/IUpgradeabilityOwnerStorage.sol

pragma solidity 0.4.24;

interface IUpgradeabilityOwnerStorage {
    function upgradeabilityOwner() external view returns (address);
}

// File: contracts/upgradeable_contracts/Upgradeable.sol

pragma solidity 0.4.24;


contract Upgradeable {
    // Avoid using onlyUpgradeabilityOwner name to prevent issues with implementation from proxy contract
    modifier onlyIfUpgradeabilityOwner() {
        require(msg.sender == IUpgradeabilityOwnerStorage(this).upgradeabilityOwner());
        /* solcov ignore next */
        _;
    }
}

// File: contracts/upgradeable_contracts/Initializable.sol

pragma solidity 0.4.24;


contract Initializable is EternalStorage {
    bytes32 internal constant INITIALIZED = 0x0a6f646cd611241d8073675e00d1a1ff700fbf1b53fcf473de56d1e6e4b714ba; // keccak256(abi.encodePacked("isInitialized"))

    function setInitialize() internal {
        boolStorage[INITIALIZED] = true;
    }

    function isInitialized() public view returns (bool) {
        return boolStorage[INITIALIZED];
    }
}

// File: contracts/upgradeable_contracts/InitializableBridge.sol

pragma solidity 0.4.24;


contract InitializableBridge is Initializable {
    bytes32 internal constant DEPLOYED_AT_BLOCK = 0xb120ceec05576ad0c710bc6e85f1768535e27554458f05dcbb5c65b8c7a749b0; // keccak256(abi.encodePacked("deployedAtBlock"))

    function deployedAtBlock() external view returns (uint256) {
        return uintStorage[DEPLOYED_AT_BLOCK];
    }
}

// File: openzeppelin-solidity/contracts/AddressUtils.sol

pragma solidity ^0.4.24;


/**
 * Utility library of inline functions on addresses
 */
library AddressUtils {

  /**
   * Returns whether the target address is a contract
   * @dev This function will return false if invoked during the constructor of a contract,
   * as the code is not actually created until after the constructor finishes.
   * @param _addr address to check
   * @return whether the target address is a contract
   */
  function isContract(address _addr) internal view returns (bool) {
    uint256 size;
    // XXX Currently there is no better way to check if there is a contract in an address
    // than to check the size of the code at that address.
    // See https://ethereum.stackexchange.com/a/14016/36603
    // for more details about how this works.
    // TODO Check this again before the Serenity release, because all addresses will be
    // contracts then.
    // solium-disable-next-line security/no-inline-assembly
    assembly { size := extcodesize(_addr) }
    return size > 0;
  }

}

// File: contracts/upgradeable_contracts/Ownable.sol

pragma solidity 0.4.24;



/**
 * @title Ownable
 * @dev This contract has an owner address providing basic authorization control
 */
contract Ownable is EternalStorage {
    bytes4 internal constant UPGRADEABILITY_OWNER = 0x6fde8202; // upgradeabilityOwner()

    /**
    * @dev Event to show ownership has been transferred
    * @param previousOwner representing the address of the previous owner
    * @param newOwner representing the address of the new owner
    */
    event OwnershipTransferred(address previousOwner, address newOwner);

    /**
    * @dev Throws if called by any account other than the owner.
    */
    modifier onlyOwner() {
        require(msg.sender == owner());
        /* solcov ignore next */
        _;
    }

    /**
    * @dev Throws if called by any account other than contract itself or owner.
    */
    modifier onlyRelevantSender() {
        // proxy owner if used through proxy, address(0) otherwise
        require(
            !address(this).call(abi.encodeWithSelector(UPGRADEABILITY_OWNER)) || // covers usage without calling through storage proxy
                msg.sender == IUpgradeabilityOwnerStorage(this).upgradeabilityOwner() || // covers usage through regular proxy calls
                msg.sender == address(this) // covers calls through upgradeAndCall proxy method
        );
        /* solcov ignore next */
        _;
    }

    bytes32 internal constant OWNER = 0x02016836a56b71f0d02689e69e326f4f4c1b9057164ef592671cf0d37c8040c0; // keccak256(abi.encodePacked("owner"))

    /**
    * @dev Tells the address of the owner
    * @return the address of the owner
    */
    function owner() public view returns (address) {
        return addressStorage[OWNER];
    }

    /**
    * @dev Allows the current owner to transfer control of the contract to a newOwner.
    * @param newOwner the address to transfer ownership to.
    */
    function transferOwnership(address newOwner) external onlyOwner {
        _setOwner(newOwner);
    }

    /**
    * @dev Sets a new owner address
    */
    function _setOwner(address newOwner) internal {
        require(newOwner != address(0));
        emit OwnershipTransferred(owner(), newOwner);
        addressStorage[OWNER] = newOwner;
    }
}

// File: contracts/upgradeable_contracts/Sacrifice.sol

pragma solidity 0.4.24;

contract Sacrifice {
    constructor(address _recipient) public payable {
        selfdestruct(_recipient);
    }
}

// File: contracts/libraries/Address.sol

pragma solidity 0.4.24;


/**
 * @title Address
 * @dev Helper methods for Address type.
 */
library Address {
    /**
    * @dev Try to send native tokens to the address. If it fails, it will force the transfer by creating a selfdestruct contract
    * @param _receiver address that will receive the native tokens
    * @param _value the amount of native tokens to send
    */
    function safeSendValue(address _receiver, uint256 _value) internal {
        if (!_receiver.send(_value)) {
            (new Sacrifice).value(_value)(_receiver);
        }
    }
}

// File: openzeppelin-solidity/contracts/math/SafeMath.sol

pragma solidity ^0.4.24;


/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {

  /**
  * @dev Multiplies two numbers, throws on overflow.
  */
  function mul(uint256 _a, uint256 _b) internal pure returns (uint256 c) {
    // Gas optimization: this is cheaper than asserting 'a' not being zero, but the
    // benefit is lost if 'b' is also tested.
    // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
    if (_a == 0) {
      return 0;
    }

    c = _a * _b;
    assert(c / _a == _b);
    return c;
  }

  /**
  * @dev Integer division of two numbers, truncating the quotient.
  */
  function div(uint256 _a, uint256 _b) internal pure returns (uint256) {
    // assert(_b > 0); // Solidity automatically throws when dividing by 0
    // uint256 c = _a / _b;
    // assert(_a == _b * c + _a % _b); // There is no case in which this doesn't hold
    return _a / _b;
  }

  /**
  * @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 _a, uint256 _b) internal pure returns (uint256) {
    assert(_b <= _a);
    return _a - _b;
  }

  /**
  * @dev Adds two numbers, throws on overflow.
  */
  function add(uint256 _a, uint256 _b) internal pure returns (uint256 c) {
    c = _a + _b;
    assert(c >= _a);
    return c;
  }
}

// File: contracts/interfaces/ERC677.sol

pragma solidity 0.4.24;


contract ERC677 is ERC20 {
    event Transfer(address indexed from, address indexed to, uint256 value, bytes data);

    function transferAndCall(address, uint256, bytes) external returns (bool);

    function increaseAllowance(address spender, uint256 addedValue) public returns (bool);
    function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool);
}

contract LegacyERC20 {
    function transfer(address _spender, uint256 _value) public; // returns (bool);
    function transferFrom(address _owner, address _spender, uint256 _value) public; // returns (bool);
}

// File: contracts/libraries/SafeERC20.sol

pragma solidity 0.4.24;



/**
 * @title SafeERC20
 * @dev Helper methods for safe token transfers.
 * Functions perform additional checks to be sure that token transfer really happened.
 */
library SafeERC20 {
    using SafeMath for uint256;

    /**
    * @dev Same as ERC20.transfer(address,uint256) but with extra consistency checks.
    * @param _token address of the token contract
    * @param _to address of the receiver
    * @param _value amount of tokens to send
    */
    function safeTransfer(address _token, address _to, uint256 _value) internal {
        LegacyERC20(_token).transfer(_to, _value);
        assembly {
            if returndatasize {
                returndatacopy(0, 0, 32)
                if iszero(mload(0)) {
                    revert(0, 0)
                }
            }
        }
    }

    /**
    * @dev Same as ERC20.transferFrom(address,address,uint256) but with extra consistency checks.
    * @param _token address of the token contract
    * @param _from address of the sender
    * @param _value amount of tokens to send
    */
    function safeTransferFrom(address _token, address _from, uint256 _value) internal {
        LegacyERC20(_token).transferFrom(_from, address(this), _value);
        assembly {
            if returndatasize {
                returndatacopy(0, 0, 32)
                if iszero(mload(0)) {
                    revert(0, 0)
                }
            }
        }
    }
}

// File: contracts/upgradeable_contracts/Claimable.sol

pragma solidity 0.4.24;



/**
 * @title Claimable
 * @dev Implementation of the claiming utils that can be useful for withdrawing accidentally sent tokens that are not used in bridge operations.
 */
contract Claimable {
    using SafeERC20 for address;

    /**
     * Throws if a given address is equal to address(0)
     */
    modifier validAddress(address _to) {
        require(_to != address(0));
        /* solcov ignore next */
        _;
    }

    /**
     * @dev Withdraws the erc20 tokens or native coins from this contract.
     * Caller should additionally check that the claimed token is not a part of bridge operations (i.e. that token != erc20token()).
     * @param _token address of the claimed token or address(0) for native coins.
     * @param _to address of the tokens/coins receiver.
     */
    function claimValues(address _token, address _to) internal validAddress(_to) {
        if (_token == address(0)) {
            claimNativeCoins(_to);
        } else {
            claimErc20Tokens(_token, _to);
        }
    }

    /**
     * @dev Internal function for withdrawing all native coins from the contract.
     * @param _to address of the coins receiver.
     */
    function claimNativeCoins(address _to) internal {
        uint256 value = address(this).balance;
        Address.safeSendValue(_to, value);
    }

    /**
     * @dev Internal function for withdrawing all tokens of ssome particular ERC20 contract from this contract.
     * @param _token address of the claimed ERC20 token.
     * @param _to address of the tokens receiver.
     */
    function claimErc20Tokens(address _token, address _to) internal {
        ERC20Basic token = ERC20Basic(_token);
        uint256 balance = token.balanceOf(this);
        _token.safeTransfer(_to, balance);
    }
}

// File: contracts/upgradeable_contracts/VersionableBridge.sol

pragma solidity 0.4.24;

contract VersionableBridge {
    function getBridgeInterfacesVersion() external pure returns (uint64 major, uint64 minor, uint64 patch) {
        return (5, 2, 0);
    }

    /* solcov ignore next */
    function getBridgeMode() external pure returns (bytes4);
}

// File: contracts/upgradeable_contracts/DecimalShiftBridge.sol

pragma solidity 0.4.24;



contract DecimalShiftBridge is EternalStorage {
    using SafeMath for uint256;

    bytes32 internal constant DECIMAL_SHIFT = 0x1e8ecaafaddea96ed9ac6d2642dcdfe1bebe58a930b1085842d8fc122b371ee5; // keccak256(abi.encodePacked("decimalShift"))

    /**
    * @dev Internal function for setting the decimal shift for bridge operations.
    * Decimal shift can be positive, negative, or equal to zero.
    * It has the following meaning: N tokens in the foreign chain are equivalent to N * pow(10, shift) tokens on the home side.
    * @param _shift new value of decimal shift.
    */
    function _setDecimalShift(int256 _shift) internal {
        // since 1 wei * 10**77 > 2**255, it does not make any sense to use higher values
        require(_shift > -77 && _shift < 77);
        uintStorage[DECIMAL_SHIFT] = uint256(_shift);
    }

    /**
    * @dev Returns the value of foreign-to-home decimal shift.
    * @return decimal shift.
    */
    function decimalShift() public view returns (int256) {
        return int256(uintStorage[DECIMAL_SHIFT]);
    }

    /**
    * @dev Converts the amount of home tokens into the equivalent amount of foreign tokens.
    * @param _value amount of home tokens.
    * @return equivalent amount of foreign tokens.
    */
    function _unshiftValue(uint256 _value) internal view returns (uint256) {
        return _shiftUint(_value, -decimalShift());
    }

    /**
    * @dev Converts the amount of foreign tokens into the equivalent amount of home tokens.
    * @param _value amount of foreign tokens.
    * @return equivalent amount of home tokens.
    */
    function _shiftValue(uint256 _value) internal view returns (uint256) {
        return _shiftUint(_value, decimalShift());
    }

    /**
    * @dev Calculates _value * pow(10, _shift).
    * @param _value amount of tokens.
    * @param _shift decimal shift to apply.
    * @return shifted value.
    */
    function _shiftUint(uint256 _value, int256 _shift) private pure returns (uint256) {
        if (_shift == 0) {
            return _value;
        }
        if (_shift > 0) {
            return _value.mul(10**uint256(_shift));
        }
        return _value.div(10**uint256(-_shift));
    }
}

// File: contracts/upgradeable_contracts/BasicBridge.sol

pragma solidity 0.4.24;









contract BasicBridge is
    InitializableBridge,
    Validatable,
    Ownable,
    Upgradeable,
    Claimable,
    VersionableBridge,
    DecimalShiftBridge
{
    event GasPriceChanged(uint256 gasPrice);
    event RequiredBlockConfirmationChanged(uint256 requiredBlockConfirmations);

    bytes32 internal constant GAS_PRICE = 0x55b3774520b5993024893d303890baa4e84b1244a43c60034d1ced2d3cf2b04b; // keccak256(abi.encodePacked("gasPrice"))
    bytes32 internal constant REQUIRED_BLOCK_CONFIRMATIONS = 0x916daedf6915000ff68ced2f0b6773fe6f2582237f92c3c95bb4d79407230071; // keccak256(abi.encodePacked("requiredBlockConfirmations"))

    /**
    * @dev Public setter for fallback gas price value. Only bridge owner can call this method.
    * @param _gasPrice new value for the gas price.
    */
    function setGasPrice(uint256 _gasPrice) external onlyOwner {
        _setGasPrice(_gasPrice);
    }

    function gasPrice() external view returns (uint256) {
        return uintStorage[GAS_PRICE];
    }

    function setRequiredBlockConfirmations(uint256 _blockConfirmations) external onlyOwner {
        _setRequiredBlockConfirmations(_blockConfirmations);
    }

    function _setRequiredBlockConfirmations(uint256 _blockConfirmations) internal {
        require(_blockConfirmations > 0);
        uintStorage[REQUIRED_BLOCK_CONFIRMATIONS] = _blockConfirmations;
        emit RequiredBlockConfirmationChanged(_blockConfirmations);
    }

    function requiredBlockConfirmations() external view returns (uint256) {
        return uintStorage[REQUIRED_BLOCK_CONFIRMATIONS];
    }

    /**
    * @dev Internal function for updating fallback gas price value.
    * @param _gasPrice new value for the gas price, zero gas price is allowed.
    */
    function _setGasPrice(uint256 _gasPrice) internal {
        uintStorage[GAS_PRICE] = _gasPrice;
        emit GasPriceChanged(_gasPrice);
    }
}

// File: contracts/upgradeable_contracts/BasicTokenBridge.sol

pragma solidity 0.4.24;





contract BasicTokenBridge is EternalStorage, Ownable, DecimalShiftBridge {
    using SafeMath for uint256;

    event DailyLimitChanged(uint256 newLimit);
    event ExecutionDailyLimitChanged(uint256 newLimit);

    bytes32 internal constant MIN_PER_TX = 0xbbb088c505d18e049d114c7c91f11724e69c55ad6c5397e2b929e68b41fa05d1; // keccak256(abi.encodePacked("minPerTx"))
    bytes32 internal constant MAX_PER_TX = 0x0f8803acad17c63ee38bf2de71e1888bc7a079a6f73658e274b08018bea4e29c; // keccak256(abi.encodePacked("maxPerTx"))
    bytes32 internal constant DAILY_LIMIT = 0x4a6a899679f26b73530d8cf1001e83b6f7702e04b6fdb98f3c62dc7e47e041a5; // keccak256(abi.encodePacked("dailyLimit"))
    bytes32 internal constant EXECUTION_MAX_PER_TX = 0xc0ed44c192c86d1cc1ba51340b032c2766b4a2b0041031de13c46dd7104888d5; // keccak256(abi.encodePacked("executionMaxPerTx"))
    bytes32 internal constant EXECUTION_DAILY_LIMIT = 0x21dbcab260e413c20dc13c28b7db95e2b423d1135f42bb8b7d5214a92270d237; // keccak256(abi.encodePacked("executionDailyLimit"))

    function totalSpentPerDay(uint256 _day) public view returns (uint256) {
        return uintStorage[keccak256(abi.encodePacked("totalSpentPerDay", _day))];
    }

    function totalExecutedPerDay(uint256 _day) public view returns (uint256) {
        return uintStorage[keccak256(abi.encodePacked("totalExecutedPerDay", _day))];
    }

    function dailyLimit() public view returns (uint256) {
        return uintStorage[DAILY_LIMIT];
    }

    function executionDailyLimit() public view returns (uint256) {
        return uintStorage[EXECUTION_DAILY_LIMIT];
    }

    function maxPerTx() public view returns (uint256) {
        return uintStorage[MAX_PER_TX];
    }

    function executionMaxPerTx() public view returns (uint256) {
        return uintStorage[EXECUTION_MAX_PER_TX];
    }

    function minPerTx() public view returns (uint256) {
        return uintStorage[MIN_PER_TX];
    }

    function withinLimit(uint256 _amount) public view returns (bool) {
        uint256 nextLimit = totalSpentPerDay(getCurrentDay()).add(_amount);
        return dailyLimit() >= nextLimit && _amount <= maxPerTx() && _amount >= minPerTx();
    }

    function withinExecutionLimit(uint256 _amount) public view returns (bool) {
        uint256 nextLimit = totalExecutedPerDay(getCurrentDay()).add(_amount);
        return executionDailyLimit() >= nextLimit && _amount <= executionMaxPerTx();
    }

    function getCurrentDay() public view returns (uint256) {
        // solhint-disable-next-line not-rely-on-time
        return now / 1 days;
    }

    function addTotalSpentPerDay(uint256 _day, uint256 _value) internal {
        uintStorage[keccak256(abi.encodePacked("totalSpentPerDay", _day))] = totalSpentPerDay(_day).add(_value);
    }

    function addTotalExecutedPerDay(uint256 _day, uint256 _value) internal {
        uintStorage[keccak256(abi.encodePacked("totalExecutedPerDay", _day))] = totalExecutedPerDay(_day).add(_value);
    }

    function setDailyLimit(uint256 _dailyLimit) external onlyOwner {
        require(_dailyLimit > maxPerTx() || _dailyLimit == 0);
        uintStorage[DAILY_LIMIT] = _dailyLimit;
        emit DailyLimitChanged(_dailyLimit);
    }

    function setExecutionDailyLimit(uint256 _dailyLimit) external onlyOwner {
        require(_dailyLimit > executionMaxPerTx() || _dailyLimit == 0);
        uintStorage[EXECUTION_DAILY_LIMIT] = _dailyLimit;
        emit ExecutionDailyLimitChanged(_dailyLimit);
    }

    function setExecutionMaxPerTx(uint256 _maxPerTx) external onlyOwner {
        require(_maxPerTx < executionDailyLimit());
        uintStorage[EXECUTION_MAX_PER_TX] = _maxPerTx;
    }

    function setMaxPerTx(uint256 _maxPerTx) external onlyOwner {
        require(_maxPerTx == 0 || (_maxPerTx > minPerTx() && _maxPerTx < dailyLimit()));
        uintStorage[MAX_PER_TX] = _maxPerTx;
    }

    function setMinPerTx(uint256 _minPerTx) external onlyOwner {
        require(_minPerTx > 0 && _minPerTx < dailyLimit() && _minPerTx < maxPerTx());
        uintStorage[MIN_PER_TX] = _minPerTx;
    }

    /**
    * @dev Retrieves maximum available bridge amount per one transaction taking into account maxPerTx() and dailyLimit() parameters.
    * @return minimum of maxPerTx parameter and remaining daily quota.
    */
    function maxAvailablePerTx() public view returns (uint256) {
        uint256 _maxPerTx = maxPerTx();
        uint256 _dailyLimit = dailyLimit();
        uint256 _spent = totalSpentPerDay(getCurrentDay());
        uint256 _remainingOutOfDaily = _dailyLimit > _spent ? _dailyLimit - _spent : 0;
        return _maxPerTx < _remainingOutOfDaily ? _maxPerTx : _remainingOutOfDaily;
    }

    function _setLimits(uint256[3] _limits) internal {
        require(
            _limits[2] > 0 && // minPerTx > 0
                _limits[1] > _limits[2] && // maxPerTx > minPerTx
                _limits[0] > _limits[1] // dailyLimit > maxPerTx
        );

        uintStorage[DAILY_LIMIT] = _limits[0];
        uintStorage[MAX_PER_TX] = _limits[1];
        uintStorage[MIN_PER_TX] = _limits[2];

        emit DailyLimitChanged(_limits[0]);
    }

    function _setExecutionLimits(uint256[2] _limits) internal {
        require(_limits[1] < _limits[0]); // foreignMaxPerTx < foreignDailyLimit

        uintStorage[EXECUTION_DAILY_LIMIT] = _limits[0];
        uintStorage[EXECUTION_MAX_PER_TX] = _limits[1];

        emit ExecutionDailyLimitChanged(_limits[0]);
    }
}

// File: contracts/upgradeable_contracts/BasicForeignBridge.sol

pragma solidity 0.4.24;









contract BasicForeignBridge is EternalStorage, Validatable, BasicBridge, BasicTokenBridge, MessageRelay {
    /// triggered when relay of deposit from HomeBridge is complete
    event RelayedMessage(address recipient, uint256 value, bytes32 transactionHash);
    event UserRequestForAffirmation(address recipient, uint256 value);

    /**
    * @dev Validates provided signatures and relays a given message
    * @param message bytes to be relayed
    * @param signatures bytes blob with signatures to be validated
    */
    function executeSignatures(bytes message, bytes signatures) external {
        Message.hasEnoughValidSignatures(message, signatures, validatorContract(), false);

        address recipient;
        uint256 amount;
        bytes32 txHash;
        address contractAddress;
        (recipient, amount, txHash, contractAddress) = Message.parseMessage(message);
        if (withinExecutionLimit(amount)) {
            require(contractAddress == address(this));
            require(!relayedMessages(txHash));
            setRelayedMessages(txHash, true);
            require(onExecuteMessage(recipient, amount, txHash));
            emit RelayedMessage(recipient, amount, txHash);
        } else {
            onFailedMessage(recipient, amount, txHash);
        }
    }

    /**
    * @dev Internal function for updating fallback gas price value.
    * @param _gasPrice new value for the gas price, zero gas price is not allowed.
    */
    function _setGasPrice(uint256 _gasPrice) internal {
        require(_gasPrice > 0);
        super._setGasPrice(_gasPrice);
    }

    /* solcov ignore next */
    function onExecuteMessage(address, uint256, bytes32) internal returns (bool);

    /* solcov ignore next */
    function onFailedMessage(address, uint256, bytes32) internal;
}

// File: contracts/upgradeable_contracts/erc20_to_erc20/BasicForeignBridgeErcToErc.sol

pragma solidity 0.4.24;




contract BasicForeignBridgeErcToErc is BasicForeignBridge {
    using SafeERC20 for ERC20;

    function _initialize(
        address _validatorContract,
        address _erc20token,
        uint256 _requiredBlockConfirmations,
        uint256 _gasPrice,
        uint256[3] _dailyLimitMaxPerTxMinPerTxArray, // [ 0 = _dailyLimit, 1 = _maxPerTx, 2 = _minPerTx ]
        uint256[2] _homeDailyLimitHomeMaxPerTxArray, // [ 0 = _homeDailyLimit, 1 = _homeMaxPerTx ]
        address _owner,
        int256 _decimalShift
    ) internal {
        require(!isInitialized());
        require(AddressUtils.isContract(_validatorContract));

        addressStorage[VALIDATOR_CONTRACT] = _validatorContract;
        setErc20token(_erc20token);
        uintStorage[DEPLOYED_AT_BLOCK] = block.number;
        _setRequiredBlockConfirmations(_requiredBlockConfirmations);
        _setGasPrice(_gasPrice);
        _setLimits(_dailyLimitMaxPerTxMinPerTxArray);
        _setExecutionLimits(_homeDailyLimitHomeMaxPerTxArray);
        _setDecimalShift(_decimalShift);
        _setOwner(_owner);
        setInitialize();
    }

    function getBridgeMode() external pure returns (bytes4 _data) {
        return 0xba4690f5; // bytes4(keccak256(abi.encodePacked("erc-to-erc-core")))
    }

    /**
     * @dev Withdraws the erc20 tokens or native coins from this contract. Bridged token cannot be withdrawn by this function.
     * @param _token address of the claimed token or address(0) for native coins.
     * @param _to address of the tokens/coins receiver.
     */
    function claimTokens(address _token, address _to) external onlyIfUpgradeabilityOwner {
        // Since bridged tokens are locked at this contract, it is not allowed to claim them with the use of claimTokens function
        require(_token != address(erc20token()));
        claimValues(_token, _to);
    }

    function onExecuteMessage(
        address _recipient,
        uint256 _amount,
        bytes32 /*_txHash*/
    ) internal returns (bool) {
        addTotalExecutedPerDay(getCurrentDay(), _amount);
        uint256 amount = _unshiftValue(_amount);

        erc20token().safeTransfer(_recipient, amount);
        return true;
    }

    function onFailedMessage(address, uint256, bytes32) internal {
        revert();
    }

    /* solcov ignore next */
    function erc20token() public view returns (ERC20);

    /* solcov ignore next */
    function setErc20token(address _token) internal;
}

// File: contracts/upgradeable_contracts/ERC20Bridge.sol

pragma solidity 0.4.24;





contract ERC20Bridge is BasicForeignBridge {
    using SafeERC20 for ERC20;
    bytes32 internal constant ERC20_TOKEN = 0x15d63b18dbc21bf4438b7972d80076747e1d93c4f87552fe498c90cbde51665e; // keccak256(abi.encodePacked("erc20token"))

    function erc20token() public view returns (ERC20) {
        return ERC20(addressStorage[ERC20_TOKEN]);
    }

    function setErc20token(address _token) internal {
        require(AddressUtils.isContract(_token));
        addressStorage[ERC20_TOKEN] = _token;
    }

    function relayTokens(address _receiver, uint256 _amount) external {
        require(_receiver != address(0));
        require(_receiver != address(this));
        require(_amount > 0);
        require(withinLimit(_amount));
        addTotalSpentPerDay(getCurrentDay(), _amount);

        erc20token().safeTransferFrom(msg.sender, _amount);
        emit UserRequestForAffirmation(_receiver, _amount);
    }
}

// File: contracts/upgradeable_contracts/erc20_to_erc20/ForeignBridgeErcToErc.sol

pragma solidity 0.4.24;



contract ForeignBridgeErcToErc is BasicForeignBridgeErcToErc, ERC20Bridge {
    function initialize(
        address _validatorContract,
        address _erc20token,
        uint256 _requiredBlockConfirmations,
        uint256 _gasPrice,
        uint256[3] _dailyLimitMaxPerTxMinPerTxArray, // [ 0 = _dailyLimit, 1 = _maxPerTx, 2 = _minPerTx ]
        uint256[2] _homeDailyLimitHomeMaxPerTxArray, // [ 0 = _homeDailyLimit, 1 = _homeMaxPerTx ]
        address _owner,
        int256 _decimalShift
    ) external onlyRelevantSender returns (bool) {
        _initialize(
            _validatorContract,
            _erc20token,
            _requiredBlockConfirmations,
            _gasPrice,
            _dailyLimitMaxPerTxMinPerTxArray,
            _homeDailyLimitHomeMaxPerTxArray,
            _owner,
            _decimalShift
        );
        return isInitialized();
    }
}

Contract Security Audit

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Contract ABI

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Contract Creation Code

Decompile Bytecode Switch to Opcodes View

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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.

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