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Contract

0xA882606494D86804B5514E07e6Bd2D6a6eE6d68A
 

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0xdfc410acec6b008bd3ac29c741812d403ee7bcdb68eb02f769a75ebaf15356ebTransfer And Cal...(pending)2024-02-25 1:34:213 days 1 hr ago1708824861IN
0xA88260...6eE6d68A
0 ETH(Pending)(Pending)
Transfer And Cal...193231852024-02-28 2:54:2314 mins ago1709088863IN
0xA88260...6eE6d68A
0 ETH0.0064620634.08440944
Transfer And Cal...193231462024-02-28 2:46:3522 mins ago1709088395IN
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0 ETH0.006741635.55883838
Approve193231282024-02-28 2:42:5925 mins ago1709088179IN
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0 ETH0.0017272935.07051919
Approve193231112024-02-28 2:39:3529 mins ago1709087975IN
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0 ETH0.0017437735.44827343
Transfer And Cal...193230942024-02-28 2:36:1132 mins ago1709087771IN
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0 ETH0.006695934.44997799
Transfer And Cal...193229852024-02-28 2:13:5954 mins ago1709086439IN
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0 ETH0.0063230133.35098735
Transfer And Cal...193229562024-02-28 2:08:111 hr ago1709086091IN
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0 ETH0.0064831334.19553492
Transfer And Cal...193229552024-02-28 2:07:591 hr ago1709086079IN
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0 ETH0.0068057235.8993436
Transfer And Cal...193229512024-02-28 2:07:111 hr 1 min ago1709086031IN
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0 ETH0.0069032536.41147155
Transfer And Cal...193229302024-02-28 2:02:471 hr 5 mins ago1709085767IN
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0 ETH0.0065243333.56726257
Transfer And Cal...193229202024-02-28 2:00:471 hr 7 mins ago1709085647IN
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0 ETH0.0057859630.5183006
Transfer And Cal...193227752024-02-28 1:31:471 hr 36 mins ago1709083907IN
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0 ETH0.0074185939.13215184
Transfer And Cal...193225382024-02-28 0:43:592 hrs 24 mins ago1709081039IN
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0 ETH0.0075627439.88997417
Transfer And Cal...193225202024-02-28 0:40:232 hrs 28 mins ago1709080823IN
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0 ETH0.0082493243.5113779
Transfer And Cal...193224292024-02-28 0:21:592 hrs 46 mins ago1709079719IN
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0 ETH0.0090830543.94531266
Transfer And Cal...193222532024-02-27 23:46:353 hrs 22 mins ago1709077595IN
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0 ETH0.008105942.75493937
Transfer And Cal...193222112024-02-27 23:38:113 hrs 30 mins ago1709077091IN
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0 ETH0.0076026940.10323341
Transfer And Cal...193222102024-02-27 23:37:593 hrs 30 mins ago1709077079IN
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0 ETH0.006723335.46234082
Transfer And Cal...193220842024-02-27 23:12:473 hrs 55 mins ago1709075567IN
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0 ETH0.0097361451.35368156
Transfer And Cal...193220422024-02-27 23:03:594 hrs 4 mins ago1709075039IN
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0 ETH0.0081697943.09188609
Transfer And Cal...193219742024-02-27 22:49:474 hrs 18 mins ago1709074187IN
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0 ETH0.0082560843.5525679
Transfer And Cal...193219582024-02-27 22:46:354 hrs 22 mins ago1709073995IN
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0 ETH0.0087611746.84370769
Transfer And Cal...193219292024-02-27 22:40:474 hrs 27 mins ago1709073647IN
0xA88260...6eE6d68A
0 ETH0.0091558747.10638276
Transfer And Cal...193218012024-02-27 22:14:234 hrs 54 mins ago1709072063IN
0xA88260...6eE6d68A
0 ETH0.0084704544.6777477
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Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0xA1077a...5D0f9a27
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:
PermittableToken

Compiler Version
v0.4.24+commit.e67f0147

Optimization Enabled:
Yes with 200 runs

Other Settings:
byzantium EvmVersion

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2023-05-15
*/

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

pragma solidity ^0.4.24;


/**
 * @title Basic token
 * @dev Basic version of StandardToken, with no allowances.
 */
contract BasicToken is ERC20Basic {
  using SafeMath for uint256;

  mapping(address => uint256) internal balances;

  uint256 internal totalSupply_;

  /**
  * @dev Total number of tokens in existence
  */
  function totalSupply() public view returns (uint256) {
    return totalSupply_;
  }

  /**
  * @dev Transfer token for a specified address
  * @param _to The address to transfer to.
  * @param _value The amount to be transferred.
  */
  function transfer(address _to, uint256 _value) public returns (bool) {
    require(_value <= balances[msg.sender]);
    require(_to != address(0));

    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    emit Transfer(msg.sender, _to, _value);
    return true;
  }

  /**
  * @dev Gets the balance of the specified address.
  * @param _owner The address to query the the balance of.
  * @return An uint256 representing the amount owned by the passed address.
  */
  function balanceOf(address _owner) public view returns (uint256) {
    return balances[_owner];
  }

}

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

pragma solidity ^0.4.24;

/**
 * @title Burnable Token
 * @dev Token that can be irreversibly burned (destroyed).
 */
contract BurnableToken is BasicToken {

  event Burn(address indexed burner, uint256 value);

  /**
   * @dev Burns a specific amount of tokens.
   * @param _value The amount of token to be burned.
   */
  function burn(uint256 _value) public {
    _burn(msg.sender, _value);
  }

  function _burn(address _who, uint256 _value) internal {
    require(_value <= balances[_who]);
    // no need to require value <= totalSupply, since that would imply the
    // sender's balance is greater than the totalSupply, which *should* be an assertion failure

    balances[_who] = balances[_who].sub(_value);
    totalSupply_ = totalSupply_.sub(_value);
    emit Burn(_who, _value);
    emit Transfer(_who, address(0), _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: openzeppelin-solidity/contracts/token/ERC20/StandardToken.sol

pragma solidity ^0.4.24;


/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * https://github.com/ethereum/EIPs/issues/20
 * Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 */
contract StandardToken is ERC20, BasicToken {

  mapping (address => mapping (address => uint256)) internal allowed;


  /**
   * @dev Transfer tokens from one address to another
   * @param _from address The address which you want to send tokens from
   * @param _to address The address which you want to transfer to
   * @param _value uint256 the amount of tokens to be transferred
   */
  function transferFrom(
    address _from,
    address _to,
    uint256 _value
  )
    public
    returns (bool)
  {
    require(_value <= balances[_from]);
    require(_value <= allowed[_from][msg.sender]);
    require(_to != address(0));

    balances[_from] = balances[_from].sub(_value);
    balances[_to] = balances[_to].add(_value);
    allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
    emit Transfer(_from, _to, _value);
    return true;
  }

  /**
   * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
   * Beware that changing an allowance with this method brings the risk that someone may use both the old
   * and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this
   * race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:
   * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
   * @param _spender The address which will spend the funds.
   * @param _value The amount of tokens to be spent.
   */
  function approve(address _spender, uint256 _value) public returns (bool) {
    allowed[msg.sender][_spender] = _value;
    emit Approval(msg.sender, _spender, _value);
    return true;
  }

  /**
   * @dev Function to check the amount of tokens that an owner allowed to a spender.
   * @param _owner address The address which owns the funds.
   * @param _spender address The address which will spend the funds.
   * @return A uint256 specifying the amount of tokens still available for the spender.
   */
  function allowance(
    address _owner,
    address _spender
   )
    public
    view
    returns (uint256)
  {
    return allowed[_owner][_spender];
  }

  /**
   * @dev Increase the amount of tokens that an owner allowed to a spender.
   * approve should be called when allowed[_spender] == 0. To increment
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   * @param _spender The address which will spend the funds.
   * @param _addedValue The amount of tokens to increase the allowance by.
   */
  function increaseApproval(
    address _spender,
    uint256 _addedValue
  )
    public
    returns (bool)
  {
    allowed[msg.sender][_spender] = (
      allowed[msg.sender][_spender].add(_addedValue));
    emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

  /**
   * @dev Decrease the amount of tokens that an owner allowed to a spender.
   * approve should be called when allowed[_spender] == 0. To decrement
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   * @param _spender The address which will spend the funds.
   * @param _subtractedValue The amount of tokens to decrease the allowance by.
   */
  function decreaseApproval(
    address _spender,
    uint256 _subtractedValue
  )
    public
    returns (bool)
  {
    uint256 oldValue = allowed[msg.sender][_spender];
    if (_subtractedValue >= oldValue) {
      allowed[msg.sender][_spender] = 0;
    } else {
      allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
    }
    emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

}

// File: openzeppelin-solidity/contracts/ownership/Ownable.sol

pragma solidity ^0.4.24;


/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
  address public owner;


  event OwnershipRenounced(address indexed previousOwner);
  event OwnershipTransferred(
    address indexed previousOwner,
    address indexed newOwner
  );


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  constructor() public {
    owner = msg.sender;
  }

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

  /**
   * @dev Allows the current owner to relinquish control of the contract.
   * @notice Renouncing to ownership will leave the contract without an owner.
   * It will not be possible to call the functions with the `onlyOwner`
   * modifier anymore.
   */
  function renounceOwnership() public onlyOwner {
    emit OwnershipRenounced(owner);
    owner = address(0);
  }

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

  /**
   * @dev Transfers control of the contract to a newOwner.
   * @param _newOwner The address to transfer ownership to.
   */
  function _transferOwnership(address _newOwner) internal {
    require(_newOwner != address(0));
    emit OwnershipTransferred(owner, _newOwner);
    owner = _newOwner;
  }
}

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

pragma solidity ^0.4.24;


/**
 * @title Mintable token
 * @dev Simple ERC20 Token example, with mintable token creation
 * Based on code by TokenMarketNet: https://github.com/TokenMarketNet/ico/blob/master/contracts/MintableToken.sol
 */
contract MintableToken is StandardToken, Ownable {
  event Mint(address indexed to, uint256 amount);
  event MintFinished();

  bool public mintingFinished = false;


  modifier canMint() {
    require(!mintingFinished);
    _;
  }

  modifier hasMintPermission() {
    require(msg.sender == owner);
    _;
  }

  /**
   * @dev Function to mint tokens
   * @param _to The address that will receive the minted tokens.
   * @param _amount The amount of tokens to mint.
   * @return A boolean that indicates if the operation was successful.
   */
  function mint(
    address _to,
    uint256 _amount
  )
    public
    hasMintPermission
    canMint
    returns (bool)
  {
    totalSupply_ = totalSupply_.add(_amount);
    balances[_to] = balances[_to].add(_amount);
    emit Mint(_to, _amount);
    emit Transfer(address(0), _to, _amount);
    return true;
  }

  /**
   * @dev Function to stop minting new tokens.
   * @return True if the operation was successful.
   */
  function finishMinting() public onlyOwner canMint returns (bool) {
    mintingFinished = true;
    emit MintFinished();
    return true;
  }
}

// File: openzeppelin-solidity/contracts/token/ERC20/DetailedERC20.sol

pragma solidity ^0.4.24;

/**
 * @title DetailedERC20 token
 * @dev The decimals are only for visualization purposes.
 * All the operations are done using the smallest and indivisible token unit,
 * just as on Ethereum all the operations are done in wei.
 */
contract DetailedERC20 is ERC20 {
  string public name;
  string public symbol;
  uint8 public decimals;

  constructor(string _name, string _symbol, uint8 _decimals) public {
    name = _name;
    symbol = _symbol;
    decimals = _decimals;
  }
}

// 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/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/interfaces/IBurnableMintableERC677Token.sol

pragma solidity 0.4.24;

contract IBurnableMintableERC677Token is ERC677 {
    function mint(address _to, uint256 _amount) public returns (bool);
    function burn(uint256 _value) public;
    function claimTokens(address _token, address _to) external;
}

// 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: 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/ERC677BridgeToken.sol

pragma solidity 0.4.24;






/**
* @title ERC677BridgeToken
* @dev The basic implementation of a bridgeable ERC677-compatible token
*/
contract ERC677BridgeToken is IBurnableMintableERC677Token, DetailedERC20, BurnableToken, MintableToken, Claimable {
    bytes4 internal constant ON_TOKEN_TRANSFER = 0xa4c0ed36; // onTokenTransfer(address,uint256,bytes)

    address internal bridgeContractAddr;

    constructor(string _name, string _symbol, uint8 _decimals) public DetailedERC20(_name, _symbol, _decimals) {
        // solhint-disable-previous-line no-empty-blocks
    }

    function bridgeContract() external view returns (address) {
        return bridgeContractAddr;
    }

    function setBridgeContract(address _bridgeContract) external onlyOwner {
        require(AddressUtils.isContract(_bridgeContract));
        bridgeContractAddr = _bridgeContract;
    }

    modifier validRecipient(address _recipient) {
        require(_recipient != address(0) && _recipient != address(this));
        /* solcov ignore next */
        _;
    }

    function transferAndCall(address _to, uint256 _value, bytes _data) external validRecipient(_to) returns (bool) {
        require(superTransfer(_to, _value));
        emit Transfer(msg.sender, _to, _value, _data);

        if (AddressUtils.isContract(_to)) {
            require(contractFallback(msg.sender, _to, _value, _data));
        }
        return true;
    }

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

    function superTransfer(address _to, uint256 _value) internal returns (bool) {
        return super.transfer(_to, _value);
    }

    function transfer(address _to, uint256 _value) public returns (bool) {
        require(superTransfer(_to, _value));
        callAfterTransfer(msg.sender, _to, _value);
        return true;
    }

    function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
        require(super.transferFrom(_from, _to, _value));
        callAfterTransfer(_from, _to, _value);
        return true;
    }

    /**
     * @dev Internal function that calls onTokenTransfer callback on the receiver after the successful transfer.
     * Since it is not present in the original ERC677 standard, the callback is only called on the bridge contract,
     * in order to simplify UX. In other cases, this token complies with the ERC677/ERC20 standard.
     * @param _from tokens sender address.
     * @param _to tokens receiver address.
     * @param _value amount of sent tokens.
     */
    function callAfterTransfer(address _from, address _to, uint256 _value) internal {
        if (isBridge(_to)) {
            require(contractFallback(_from, _to, _value, new bytes(0)));
        }
    }

    function isBridge(address _address) public view returns (bool) {
        return _address == bridgeContractAddr;
    }

    /**
     * @dev call onTokenTransfer fallback on the token recipient contract
     * @param _from tokens sender
     * @param _to tokens recipient
     * @param _value amount of tokens that was sent
     * @param _data set of extra bytes that can be passed to the recipient
     */
    function contractFallback(address _from, address _to, uint256 _value, bytes _data) private returns (bool) {
        return _to.call(abi.encodeWithSelector(ON_TOKEN_TRANSFER, _from, _value, _data));
    }

    function finishMinting() public returns (bool) {
        revert();
    }

    function renounceOwnership() public onlyOwner {
        revert();
    }

    /**
     * @dev Withdraws the erc20 tokens or native coins from this contract.
     * @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 onlyOwner {
        claimValues(_token, _to);
    }

    function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
        return super.increaseApproval(spender, addedValue);
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
        return super.decreaseApproval(spender, subtractedValue);
    }
}

// File: contracts/PermittableToken.sol

pragma solidity 0.4.24;

contract PermittableToken is ERC677BridgeToken {
    string public constant version = "1";

    // EIP712 niceties
    bytes32 public DOMAIN_SEPARATOR;
    // 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;

    constructor(string memory _name, string memory _symbol, uint8 _decimals, uint256 _chainId)
        public
        ERC677BridgeToken(_name, _symbol, _decimals)
    {
        require(_chainId != 0);
        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                keccak256(bytes(_name)),
                keccak256(bytes(version)),
                _chainId,
                address(this)
            )
        );
    }

    /// @dev transferFrom in this contract works in a slightly different form than the generic
    /// transferFrom function. This contract allows for "unlimited approval".
    /// Should the user approve an address for the maximum uint256 value,
    /// then that address will have unlimited approval until told otherwise.
    /// @param _sender The address of the sender.
    /// @param _recipient The address of the recipient.
    /// @param _amount The value to transfer.
    /// @return Success status.
    function transferFrom(address _sender, address _recipient, uint256 _amount) public returns (bool) {
        require(_sender != address(0));
        require(_recipient != address(0));

        balances[_sender] = balances[_sender].sub(_amount);
        balances[_recipient] = balances[_recipient].add(_amount);
        emit Transfer(_sender, _recipient, _amount);

        if (_sender != msg.sender) {
            uint256 allowedAmount = allowance(_sender, msg.sender);

            if (allowedAmount != uint256(-1)) {
                // If allowance is limited, adjust it.
                // In this case `transferFrom` works like the generic
                allowed[_sender][msg.sender] = allowedAmount.sub(_amount);
                emit Approval(_sender, msg.sender, allowed[_sender][msg.sender]);
            } 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);
            }
        } else {
            // If `_sender` is `msg.sender`,
            // the function works just like `transfer()`
        }

        callAfterTransfer(_sender, _recipient, _amount);
        return true;
    }

    /// @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
    /// @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) {
        _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) {
        _approveAndResetExpirations(msg.sender, _to, allowed[msg.sender][_to].add(_addedValue));
        return true;
    }

    /// @dev An alias for `transfer` function.
    /// @param _to The address of the recipient.
    /// @param _amount The value to transfer.
    function push(address _to, uint256 _amount) public {
        transferFrom(msg.sender, _to, _amount);
    }

    /// @dev Makes a request to transfer the specified amount
    /// from the specified address to the caller's address.
    /// @param _from The address of the holder.
    /// @param _amount The value to transfer.
    function pull(address _from, uint256 _amount) public {
        transferFrom(_from, msg.sender, _amount);
    }

    /// @dev An alias for `transferFrom` function.
    /// @param _from The address of the sender.
    /// @param _to The address of the recipient.
    /// @param _amount The value to transfer.
    function move(address _from, address _to, uint256 _amount) public {
        transferFrom(_from, _to, _amount);
    }

    /// @dev Allows to spend holder's unlimited amount by the specified spender.
    /// 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 _nonce The nonce taken from `nonces(_holder)` public getter.
    /// @param _expiry The allowance expiration date (unix timestamp in UTC).
    /// Can be zero for no expiration. Forced to zero if `_allowed` is `false`.
    /// 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 _allowed True to enable unlimited allowance for the spender by the holder. False to disable.
    /// @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 _nonce,
        uint256 _expiry,
        bool _allowed,
        uint8 _v,
        bytes32 _r,
        bytes32 _s
    ) external {
        require(_expiry == 0 || now <= _expiry);

        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;

        expirations[_holder][_spender] = _allowed ? _expiry : 0;

        _approve(_holder, _spender, amount);
    }

    /** @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;
    }
}

Contract Security Audit

Contract ABI

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Deployed Bytecode

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