Contract Overview
Balance: 0 Ether
Ether Value: $0
Transactions: 1628 txns
Token Tracker: Tip Token (TIP)
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Contract Creator: 0x2b73e72c0f00067e1a69c1ff90e6fb391ff3ac62at txn 0x426042f9074b599992ef9d99208d76671597fc838b98fffb72a057979356f0c3
 Latest 25 transactions from a total of 1628 transactions

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0x87d9470dc2a986894fbc57a58af9e8e6417614e203518fc0d8bb6ef903d0087714 hrs 21 mins ago0xab39a77624fa54d6af8f5e9f7e12153e87492b70  IN   0x59ae863232238a8bd7953bdfc1b4796f8e9a5b4e0 Ether0.0000313642
0x0c2379b6b37a6e0e8a9e13592c883f948cdbf3848ef64577a8cc4653b272c6a514 hrs 21 mins ago0x145d9baab1de9eedf8b43a2a1191bd13f524153d  IN   0x59ae863232238a8bd7953bdfc1b4796f8e9a5b4e0 Ether0.0000523642
0xba52caf5dd93b2f10038e863c166b4e62a350176d2b1e60698bf276000d2ad2014 hrs 58 mins ago0x1f9607232624d556e968dc6acfda3a2cc24ec244  IN   0x59ae863232238a8bd7953bdfc1b4796f8e9a5b4e0 Ether0.000599472
0xdafddefbc6b69568850e0d08d3850db249fdd5ed4cc37124e23e0d49bf864b4715 hrs 6 mins ago0x1f9607232624d556e968dc6acfda3a2cc24ec244  IN   0x59ae863232238a8bd7953bdfc1b4796f8e9a5b4e0 Ether0.000512
0xa25c4c0f1302a0869001f68a8ac91f24a767b72d1c304fc90e20050ca9d9787215 hrs 10 mins ago0x1f9607232624d556e968dc6acfda3a2cc24ec244  IN   0x59ae863232238a8bd7953bdfc1b4796f8e9a5b4e0 Ether0.000512
0x1247b4d6662f9fc9b66bb6401eed857429c1678a7ea2c9b16de0700c453428071 day 8 hrs ago0x840f93358c4f2f004ec401d721a39c7c35e8c7ad  IN   0x59ae863232238a8bd7953bdfc1b4796f8e9a5b4e0 Ether0.000182352
0x8ce1d0ad6ca3f52cf4a7d6e53d0f7d91d5423d1fe4256944cb7df67bd98d19042 days 5 hrs ago0x87e70ef980e38392fd9a22ff16529725dc12de90  IN   0x59ae863232238a8bd7953bdfc1b4796f8e9a5b4e0 Ether0.000995657
0x3c757d50e627fea55bc3a0c4bca9650b6e1a6633e0513714437b4147de6ae3654 days 19 hrs ago0xd78bd85e5546302bbe8536dbdde68f61eaadd5e9  IN   0x59ae863232238a8bd7953bdfc1b4796f8e9a5b4e0 Ether0.000136764
0xfbbc5ccbcb531b01e1448beb3c7db99a769445b06c127c692249ae724a74c51c6 days 10 hrs ago0x479b1160a9d5c317148a0eecd15f0bf893d8bca6  IN   0x59ae863232238a8bd7953bdfc1b4796f8e9a5b4e0 Ether0.000136764
0xa28bc2c05a8a2a4851441b9594c1e51659d454337ceb20fdf25c14c24b9ab2226 days 16 hrs ago0x0dee9498029af45661a5d7d8e18610ce59912f5d  IN   0x59ae863232238a8bd7953bdfc1b4796f8e9a5b4e0 Ether0.000860269
0x4eb4dd1a3d8f7aee62bc1c8e04a61beb429cbff4361556f160f502d946df51866 days 18 hrs ago0x69189716420ffcc0ca2e4f9869433389df331f9c  IN   0x59ae863232238a8bd7953bdfc1b4796f8e9a5b4e0 Ether0.000262655
0x18059ec2ff387309b842e76175f47525744c7b96f944be1a7d548d8241ca16ef6 days 18 hrs ago0x69189716420ffcc0ca2e4f9869433389df331f9c  IN   0x59ae863232238a8bd7953bdfc1b4796f8e9a5b4e0 Ether0.000262655
0x97ed367c5e6ff52d8b8cb7e4415743bb09eee33a53fa224f9c3e81f9dba318656 days 18 hrs ago0x69189716420ffcc0ca2e4f9869433389df331f9c  IN   0x59ae863232238a8bd7953bdfc1b4796f8e9a5b4e0 Ether0.000262655
0x40ac2565fe1e9633969bd7d9c265210da05e0c6c5fa0070d6e684b79a0930b4f6 days 18 hrs ago0x69189716420ffcc0ca2e4f9869433389df331f9c  IN   0x59ae863232238a8bd7953bdfc1b4796f8e9a5b4e0 Ether0.000262655
0xb98c3e8a716ed1db3790b033f5692ea2b53896c4f672aeb0167359987725d2b86 days 18 hrs ago0x69189716420ffcc0ca2e4f9869433389df331f9c  IN   0x59ae863232238a8bd7953bdfc1b4796f8e9a5b4e0 Ether0.000262655
0x67580fc842f2b0a7f32b30441ae3bd4a4eadedcf70b1751a91f69e0e3bab8efe6 days 18 hrs ago0x69189716420ffcc0ca2e4f9869433389df331f9c  IN   0x59ae863232238a8bd7953bdfc1b4796f8e9a5b4e0 Ether0.000262655
0x80689c37d12034c2fd140bf475504d3b12c5dd89426827af28b3901d439d0d726 days 18 hrs ago0x69189716420ffcc0ca2e4f9869433389df331f9c  IN   0x59ae863232238a8bd7953bdfc1b4796f8e9a5b4e0 Ether0.000262655
0xd9fcc48ddae79cb90356117753d338fd7830a87e9f10a4bf6cf04a4f40f500257 days 15 hrs ago0x8a9449e43b1b9362df4bce2c89d296e83383d3b4  IN   0x59ae863232238a8bd7953bdfc1b4796f8e9a5b4e0 Ether0.0001346508
0x453b65f7f13edb418165f89fff18e3bb6e9d0297e8c751e71e37ae348f0b187c8 days 9 hrs ago0x8704021ed75b5a74acd3ddf7df2e6935deb7a8fd  IN   0x59ae863232238a8bd7953bdfc1b4796f8e9a5b4e0 Ether0.000112593
0x8f9b43dae743dd43fe72a27ed4180aa8cbbf89c531ff3d0491a4400d7f0c8ebd8 days 19 hrs ago0x87e70ef980e38392fd9a22ff16529725dc12de90  IN   0x59ae863232238a8bd7953bdfc1b4796f8e9a5b4e0 Ether0.000995657
0x2013c18d5f410f001a6a3e07c8dfb79a7171bccc7fca4bb013e22022cc60ed238 days 19 hrs ago0x87e70ef980e38392fd9a22ff16529725dc12de90  IN   0x59ae863232238a8bd7953bdfc1b4796f8e9a5b4e0 Ether0.000995657
0xabbf37bb850be344431737436ab05d1b61b642869f0c79dfeb8f773049287cf68 days 19 hrs ago0x87e70ef980e38392fd9a22ff16529725dc12de90  IN   0x59ae863232238a8bd7953bdfc1b4796f8e9a5b4e0 Ether0.000995657
0xc5234cc0d5c856e06626ae4e23e608cb83faf1e962502c0e3c04729a41da04eb8 days 19 hrs ago0x87e70ef980e38392fd9a22ff16529725dc12de90  IN   0x59ae863232238a8bd7953bdfc1b4796f8e9a5b4e0 Ether0.000995657
0x2eb4fb4d940d126005a8f384c357178ab3203ab8e2568e59b730c1e9bf97562b8 days 19 hrs ago0x87e70ef980e38392fd9a22ff16529725dc12de90  IN   0x59ae863232238a8bd7953bdfc1b4796f8e9a5b4e0 Ether0.000995657
0x1479ae54da3fbeba804c8afb871c3477b3a72ad8ec3b7461f08eb1553b5bf2268 days 19 hrs ago0x87e70ef980e38392fd9a22ff16529725dc12de90  IN   0x59ae863232238a8bd7953bdfc1b4796f8e9a5b4e0 Ether0.000995657
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Warning: The Compiled Contract might be susceptible to ExpExponentCleanup (medium/high-severity), EventStructWrongData (very low-severity) SolidityCompiler Bugs.

Contract Source Code Verified (Exact Match)
Contract Name: TipToken
Compiler Text: v0.4.23+commit.124ca40d
Optimization Enabled: Yes
Runs (Optimiser):  200



  Contract Source Code   Find Similiar Contracts

pragma solidity ^0.4.23;

library SafeMath {

    /**
    * @dev Multiplies two numbers, throws on overflow.
    */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 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) {
        uint256 c = a + b;
        assert(c >= a);
        return c;
    }
}


contract ApproveAndCallFallBack {
    function receiveApproval(address from, uint256 tokens, address token, bytes data) public;
}

contract Ownable {
    address public owner;


    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 transfer control of the contract to a newOwner.
    * @param newOwner The address to transfer ownership to.
    */
    function transferOwnership(address newOwner) public onlyOwner {
        require(newOwner != address(0));
        emit OwnershipTransferred(owner, newOwner);
        owner = newOwner;
    }
}
contract ERC20 {
    function totalSupply() public constant returns (uint);
    function balanceOf(address tokenOwner) public constant returns (uint balance);
    function allowance(address tokenOwner, address spender) public constant returns (uint remaining);
    function transfer(address to, uint tokens) public returns (bool success);
    function approve(address spender, uint tokens) public returns (bool success);
    function transferFrom(address from, address to, uint tokens) public returns (bool success);

    event Transfer(address indexed from, address indexed to, uint tokens);
    event Approval(address indexed tokenOwner, address indexed spender, uint tokens);
}
contract ERC865 is ERC20 {

    function transferPreSigned(
        bytes _signature,
        address _to,
        uint256 _value,
        uint256 _fee,
        uint256 _nonce
    )
        public
        returns (bool);

    function approvePreSigned(
        bytes _signature,
        address _spender,
        uint256 _value,
        uint256 _fee,
        uint256 _nonce
    )
        public
        returns (bool);

    function increaseApprovalPreSigned(
        bytes _signature,
        address _spender,
        uint256 _addedValue,
        uint256 _fee,
        uint256 _nonce
    )
        public
        returns (bool);

    function decreaseApprovalPreSigned(
        bytes _signature,
        address _spender,
        uint256 _subtractedValue,
        uint256 _fee,
        uint256 _nonce
    )
        public
        returns (bool);

    function transferFromPreSigned(
        bytes _signature,
        address _from,
        address _to,
        uint256 _value,
        uint256 _fee,
        uint256 _nonce
    )
        public
        returns (bool);

    function revokeSignature(bytes _signature)
    public
    returns (bool);

}
contract StandardToken is ERC20  {

  using SafeMath for uint256;

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

  mapping(address => uint256) public balances;

  uint256 _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(_to != address(0));
    require(_value <= balances[msg.sender]);

    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 balance) {
    return balances[_owner];
  }

  /**
   * @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(_to != address(0));
    require(_value <= balances[_from]);
    require(_value <= allowed[_from][msg.sender]);

    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, uint _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, uint _subtractedValue) public returns (bool) {
    uint 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;
  }

}

contract ERC865Token is ERC865, StandardToken {

    /* Nonces of transfers performed */
    mapping(bytes => bool) nonces;

    event TransferPreSigned(address indexed from, address indexed to, address indexed delegate, uint256 amount, uint256 fee);
    event ApprovalPreSigned(address indexed from, address indexed to, address indexed delegate, uint256 amount, uint256 fee);
    event SignatureRevoked(bytes signature, address indexed from);

    /**
     * @notice Submit a presigned transfer
     * @param _signature bytes The signature, issued by the owner.
     * @param _to address The address which you want to transfer to.
     * @param _value uint256 The amount of tokens to be transferred.
     * @param _fee uint256 The amount of tokens paid to msg.sender, by the owner.
     * @param _nonce uint256 Presigned transaction number.
     */
    function transferPreSigned(
        bytes _signature,
        address _to,
        uint256 _value,
        uint256 _fee,
        uint256 _nonce
    )
        public
        returns (bool)
    {
        require(_to != address(0));
        require(!nonces[_signature]);

        bytes32 hashedTx = transferPreSignedHashing(address(this), _to, _value, _fee, _nonce);

        address from = recover(hashedTx, _signature);
        require(from != address(0));

        nonces[_signature] = true;

        balances[from] = balances[from].sub(_value).sub(_fee);
        balances[_to] = balances[_to].add(_value);
        balances[msg.sender] = balances[msg.sender].add(_fee);

        emit Transfer(from, _to, _value);
        emit Transfer(from, msg.sender, _fee);
        emit TransferPreSigned(from, _to, msg.sender, _value, _fee);
        return true;
    }

    /**
     * @notice Submit a presigned approval
     * @param _signature bytes The signature, issued by the owner.
     * @param _spender address The address which will spend the funds.
     * @param _value uint256 The amount of tokens to allow.
     * @param _fee uint256 The amount of tokens paid to msg.sender, by the owner.
     * @param _nonce uint256 Presigned transaction number.
     */
    function approvePreSigned(
        bytes _signature,
        address _spender,
        uint256 _value,
        uint256 _fee,
        uint256 _nonce
    )
        public
        returns (bool)
    {
        require(_spender != address(0));
        require(!nonces[_signature]);

        bytes32 hashedTx = approvePreSignedHashing(address(this), _spender, _value, _fee, _nonce);
        address from = recover(hashedTx, _signature);
        require(from != address(0));

        nonces[_signature] = true;

        allowed[from][_spender] = _value;
        balances[from] = balances[from].sub(_fee);
        balances[msg.sender] = balances[msg.sender].add(_fee);

        emit Approval(from, _spender, _value);
        emit Transfer(from, msg.sender, _fee);
        emit ApprovalPreSigned(from, _spender, msg.sender, _value, _fee);
        return true;
    }

    /**
     * @notice Increase the amount of tokens that an owner allowed to a spender.
     * @param _signature bytes The signature, issued by the owner.
     * @param _spender address The address which will spend the funds.
     * @param _addedValue uint256 The amount of tokens to increase the allowance by.
     * @param _fee uint256 The amount of tokens paid to msg.sender, by the owner.
     * @param _nonce uint256 Presigned transaction number.
     */
    function increaseApprovalPreSigned(
        bytes _signature,
        address _spender,
        uint256 _addedValue,
        uint256 _fee,
        uint256 _nonce
    )
        public
        returns (bool)
    {
        require(_spender != address(0));
        require(!nonces[_signature]);

        bytes32 hashedTx = increaseApprovalPreSignedHashing(address(this), _spender, _addedValue, _fee, _nonce);
        address from = recover(hashedTx, _signature);
        require(from != address(0));

        nonces[_signature] = true;

        allowed[from][_spender] = allowed[from][_spender].add(_addedValue);
        balances[from] = balances[from].sub(_fee);
        balances[msg.sender] = balances[msg.sender].add(_fee);

        emit Approval(from, _spender, allowed[from][_spender]);
        emit Transfer(from, msg.sender, _fee);
        emit ApprovalPreSigned(from, _spender, msg.sender, allowed[from][_spender], _fee);
        return true;
    }

    /**
     * @notice Decrease the amount of tokens that an owner allowed to a spender.
     * @param _signature bytes The signature, issued by the owner
     * @param _spender address The address which will spend the funds.
     * @param _subtractedValue uint256 The amount of tokens to decrease the allowance by.
     * @param _fee uint256 The amount of tokens paid to msg.sender, by the owner.
     * @param _nonce uint256 Presigned transaction number.
     */
    function decreaseApprovalPreSigned(
        bytes _signature,
        address _spender,
        uint256 _subtractedValue,
        uint256 _fee,
        uint256 _nonce
    )
        public
        returns (bool)
    {
        require(_spender != address(0));
        require(!nonces[_signature]);

        bytes32 hashedTx = decreaseApprovalPreSignedHashing(address(this), _spender, _subtractedValue, _fee, _nonce);
        address from = recover(hashedTx, _signature);
        require(from != address(0));

        nonces[_signature] = true;

        uint oldValue = allowed[from][_spender];
        if (_subtractedValue > oldValue) {
            allowed[from][_spender] = 0;
        } else {
            allowed[from][_spender] = oldValue.sub(_subtractedValue);
        }
        balances[from] = balances[from].sub(_fee);
        balances[msg.sender] = balances[msg.sender].add(_fee);

        emit Approval(from, _spender, _subtractedValue);
        emit Transfer(from, msg.sender, _fee);
        emit ApprovalPreSigned(from, _spender, msg.sender, allowed[from][_spender], _fee);
        return true;
    }

    /**
     * @notice Transfer tokens from one address to another
     * @param _signature bytes The signature, issued by the spender.
     * @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.
     * @param _fee uint256 The amount of tokens paid to msg.sender, by the spender.
     * @param _nonce uint256 Presigned transaction number.
     */
    function transferFromPreSigned(
        bytes _signature,
        address _from,
        address _to,
        uint256 _value,
        uint256 _fee,
        uint256 _nonce
    )
        public
        returns (bool)
    {
        require(_to != address(0));
        require(!nonces[_signature]);

        bytes32 hashedTx = transferFromPreSignedHashing(address(this), _from, _to, _value, _fee, _nonce);

        address spender = recover(hashedTx, _signature);
        require(spender != address(0));

        nonces[_signature] = true;

        balances[_from] = balances[_from].sub(_value);
        balances[_to] = balances[_to].add(_value);
        allowed[_from][spender] = allowed[_from][spender].sub(_value);

        balances[spender] = balances[spender].sub(_fee);
        balances[msg.sender] = balances[msg.sender].add(_fee);
        nonces[_signature] = true;

        emit Transfer(_from, _to, _value);
        emit Transfer(spender, msg.sender, _fee);
        return true;
    }

    /**
     * Revote previously approved signature
     * @param  _signature bytes The signature to revoke
     * @return bool  Returns true if revocation was successful
     */
    function revokeSignature(bytes _signature) public returns (bool) {
        require(!nonces[_signature]);
        nonces[_signature] = true;

        emit SignatureRevoked(_signature, msg.sender);
        return true;
    }


    /**
     * @notice Hash (keccak256) of the payload used by transferPreSigned
     * @param _token address The address of the token.
     * @param _to address The address which you want to transfer to.
     * @param _value uint256 The amount of tokens to be transferred.
     * @param _fee uint256 The amount of tokens paid to msg.sender, by the owner.
     * @param _nonce uint256 Presigned transaction number.
     */
    function transferPreSignedHashing(
        address _token,
        address _to,
        uint256 _value,
        uint256 _fee,
        uint256 _nonce
    )
        public
        pure
        returns (bytes32)
    {
        /* "48664c16": transferPreSignedHashing(address,address,address,uint256,uint256,uint256) */
        return keccak256(bytes4(0x48664c16), _token, _to, _value, _fee, _nonce);
    }

    /**
     * @notice Hash (keccak256) of the payload used by approvePreSigned
     * @param _token address The address of the token
     * @param _spender address The address which will spend the funds.
     * @param _value uint256 The amount of tokens to allow.
     * @param _fee uint256 The amount of tokens paid to msg.sender, by the owner.
     * @param _nonce uint256 Presigned transaction number.
     */
    function approvePreSignedHashing(
        address _token,
        address _spender,
        uint256 _value,
        uint256 _fee,
        uint256 _nonce
    )
        public
        pure
        returns (bytes32)
    {
        /* "f7ac9c2e": approvePreSignedHashing(address,address,uint256,uint256,uint256) */
        return keccak256(bytes4(0xf7ac9c2e), _token, _spender, _value, _fee, _nonce);
    }

    /**
     * @notice Hash (keccak256) of the payload used by increaseApprovalPreSigned
     * @param _token address The address of the token
     * @param _spender address The address which will spend the funds.
     * @param _addedValue uint256 The amount of tokens to increase the allowance by.
     * @param _fee uint256 The amount of tokens paid to msg.sender, by the owner.
     * @param _nonce uint256 Presigned transaction number.
     */
    function increaseApprovalPreSignedHashing(
        address _token,
        address _spender,
        uint256 _addedValue,
        uint256 _fee,
        uint256 _nonce
    )
        public
        pure
        returns (bytes32)
    {
        /* "a45f71ff": increaseApprovalPreSignedHashing(address,address,uint256,uint256,uint256) */
        return keccak256(bytes4(0xa45f71ff), _token, _spender, _addedValue, _fee, _nonce);
    }

     /**
      * @notice Hash (keccak256) of the payload used by decreaseApprovalPreSigned
      * @param _token address The address of the token
      * @param _spender address The address which will spend the funds.
      * @param _subtractedValue uint256 The amount of tokens to decrease the allowance by.
      * @param _fee uint256 The amount of tokens paid to msg.sender, by the owner.
      * @param _nonce uint256 Presigned transaction number.
      */
    function decreaseApprovalPreSignedHashing(
        address _token,
        address _spender,
        uint256 _subtractedValue,
        uint256 _fee,
        uint256 _nonce
    )
        public
        pure
        returns (bytes32)
    {
        /* "59388d78": decreaseApprovalPreSignedHashing(address,address,uint256,uint256,uint256) */
        return keccak256(bytes4(0x59388d78), _token, _spender, _subtractedValue, _fee, _nonce);
    }

    /**
     * @notice Hash (keccak256) of the payload used by transferFromPreSigned
     * @param _token address The address of the token
     * @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.
     * @param _fee uint256 The amount of tokens paid to msg.sender, by the spender.
     * @param _nonce uint256 Presigned transaction number.
     */
    function transferFromPreSignedHashing(
        address _token,
        address _from,
        address _to,
        uint256 _value,
        uint256 _fee,
        uint256 _nonce
    )
        public
        pure
        returns (bytes32)
    {
        /* "b7656dc5": transferFromPreSignedHashing(address,address,address,uint256,uint256,uint256) */
        return keccak256(bytes4(0xb7656dc5), _token, _from, _to, _value, _fee, _nonce);
    }

    /**
     * @notice Recover signer address from a message by using his signature
     * @param hash bytes32 message, the hash is the signed message. What is recovered is the signer address.
     * @param sig bytes signature, the signature is generated using web3.eth.sign()
     */
    function recover(bytes32 hash, bytes sig) public pure returns (address) {
      bytes32 r;
      bytes32 s;
      uint8 v;

      //Check the signature length
      if (sig.length != 65) {
        return (address(0));
      }

      // Divide the signature in r, s and v variables
      assembly {
        r := mload(add(sig, 32))
        s := mload(add(sig, 64))
        v := byte(0, mload(add(sig, 96)))
      }

      // Version of signature should be 27 or 28, but 0 and 1 are also possible versions
      if (v < 27) {
        v += 27;
      }

      // If the version is correct return the signer address
      if (v != 27 && v != 28) {
        return (address(0));
      } else {
        return ecrecover(hash, v, r, s);
      }
    }

}

contract TipToken is ERC865Token, Ownable {
    using SafeMath for uint256;

    uint256 public constant TOTAL_SUPPLY = 10 ** 9;

    string public constant name = "Tip Token";
    string public constant symbol = "TIP";
    uint8 public constant decimals = 18;

    mapping (address => string) aliases;
    mapping (string => address) addresses;

    /**
     * Constructor
     */
    constructor() public {
        _totalSupply = TOTAL_SUPPLY * (10**uint256(decimals));
        balances[owner] = _totalSupply;
        emit Transfer(address(0), owner, _totalSupply);
    }

    /**
     * Returns the available supple (total supply minus tokens held by owner)
     */
    function availableSupply() public view returns (uint256) {
        return _totalSupply.sub(balances[owner]).sub(balances[address(0)]);
    }

    /**
     * Token owner can approve for `spender` to transferFrom(...) `tokens`
     * from the token owner's account. The `spender` contract function
     * `receiveApproval(...)` is then executed
     */
    function approveAndCall(address spender, uint256 tokens, bytes data) public returns (bool success) {
        allowed[msg.sender][spender] = tokens;
        emit Approval(msg.sender, spender, tokens);
        ApproveAndCallFallBack(spender).receiveApproval(msg.sender, tokens, this, data);
        return true;
    }

    /**
     * Don't accept ETH.
     */
    function () public payable {
        revert();
    }

    /**
     * Owner can transfer out any accidentally sent ERC20 tokens
     */
    function transferAnyERC20Token(address tokenAddress, uint256 tokens) public onlyOwner returns (bool success) {
        return ERC20(tokenAddress).transfer(owner, tokens);
    }

    /**
     * Sets the alias for the msg.sender's address.
     * @param alias the alias to attach to an address
     */
    function setAlias(string alias) public {
        aliases[msg.sender] = alias;
        addresses[alias] = msg.sender;
    }
}

    Contract ABI  
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pprovalPreSigned","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_token","type":"address"},{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_value","type":"uint256"},{"name":"_fee","type":"uint256"},{"name":"_nonce","type":"uint256"}],"name":"transferFromPreSignedHashing","outputs":[{"name":"","type":"bytes32"}],"payable":false,"stateMutability":"pure","type":"function"},{"constant":false,"inputs":[{"name":"_signature","type":"bytes"},{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_value","type":"uint256"},{"name":"_fee","type":"uint256"},{"name":"_nonce","type":"uint256"}],"name":"transferFromPreSigned","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"spender","type":"address"},{"name":"tokens","type":"uint256"},{"name":"data","type":"bytes"}],"name":"approveAndCall","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_signature","type":"bytes"}],"name":"revokeSignature","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_addedValue","type":"uint256"}],"name":"increaseApproval","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"tokenAddress","type":"address"},{"name":"tokens","type":"uint256"}],"name":"transferAnyERC20Token","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"},{"name":"_spender","type":"address"}],"name":"allowance","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_token","type":"address"},{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"},{"name":"_fee","type":"uint256"},{"name":"_nonce","type":"uint256"}],"name":"approvePreSignedHashing","outputs":[{"name":"","type":"bytes32"}],"payable":false,"stateMutability":"pure","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"anonymous":false,"inputs":[{"indexed":true,"name":"previousOwner","type":"address"},{"indexed":true,"name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"from","type":"address"},{"indexed":true,"name":"to","type":"address"},{"indexed":true,"name":"delegate","type":"address"},{"indexed":false,"name":"amount","type":"uint256"},{"indexed":false,"name":"fee","type":"uint256"}],"name":"TransferPreSigned","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"from","type":"address"},{"indexed":true,"name":"to","type":"address"},{"indexed":true,"name":"delegate","type":"address"},{"indexed":false,"name":"amount","type":"uint256"},{"indexed":false,"name":"fee","type":"uint256"}],"name":"ApprovalPreSigned","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"signature","type":"bytes"},{"indexed":true,"name":"from","type":"address"}],"name":"SignatureRevoked","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"from","type":"address"},{"indexed":true,"name":"to","type":"address"},{"indexed":false,"name":"tokens","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"tokenOwner","type":"address"},{"indexed":true,"name":"spender","type":"address"},{"indexed":false,"name":"tokens","type":"uint256"}],"name":"Approval","type":"event"}]

  Contract Creation Code Switch To Opcodes View
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   Swarm Source:
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