{"BasicToken.sol":{"content":"pragma solidity ^0.4.18;\n\n\nimport \u0027./SafeMath.sol\u0027;\n\n/**\n * @title ERC20Basic\n * @dev Simpler version of ERC20 interface\n */\ncontract ERC20Basic {\n  function totalSupply() public constant returns (uint);\n  function balanceOf(address who) public view returns (uint256);\n  function transfer(address to, uint256 value) public returns (bool);\n  event Transfer(address indexed from, address indexed to, uint256 value);\n}\n\n/**\n * @title Basic token\n * @dev Basic version of StandardToken, with no allowances.\n */\ncontract BasicToken is ERC20Basic {\n  using SafeMath for uint256;\n\n  mapping(address =\u003e uint256) balances;\n\n  /**\n  * @dev transfer token for a specified address\n  * @param _to The address to transfer to.\n  * @param _value The amount to be transferred.\n  */\n  function transfer(address _to, uint256 _value) public returns (bool) {\n    require(_to != address(0));\n    require(_value \u003c= balances[msg.sender]);\n\n    // SafeMath.sub will throw if there is not enough balance.\n    balances[msg.sender] = balances[msg.sender].sub(_value);\n    balances[_to] = balances[_to].add(_value);\n    Transfer(msg.sender, _to, _value);\n    return true;\n  }\n\n  /**\n  * @dev Gets the balance of the specified address.\n  * @param _owner The address to query the the balance of.\n  * @return An uint256 representing the amount owned by the passed address.\n  */\n  function balanceOf(address _owner) public view returns (uint256 balance) {\n    return balances[_owner];\n  }\n\n}\n"},"BlackList.sol":{"content":"pragma solidity ^0.4.18;\n\nimport \"./Ownable.sol\";\n\ncontract BlackList is Ownable {\n\n    function getBlackListStatus(address _maker) external constant returns (bool) {\n        return isBlackListed[_maker];\n    }\n\n    mapping (address =\u003e bool) public isBlackListed;\n\n    function addBlackList (address _evilUser) public onlyOwner {\n        isBlackListed[_evilUser] = true;\n        AddedBlackList(_evilUser);\n    }\n\n    function removeBlackList (address _clearedUser) public onlyOwner {\n        isBlackListed[_clearedUser] = false;\n        RemovedBlackList(_clearedUser);\n    }\n\n    event AddedBlackList(address indexed _user);\n\n    event RemovedBlackList(address indexed _user);\n\n}\n"},"ERC20TRX.sol":{"content":"pragma solidity ^0.4.18;\n\nimport \"./StandardTokenWithFees.sol\";\nimport \"./Pausable.sol\";\nimport \"./BlackList.sol\";\n\ncontract UpgradedStandardToken is StandardToken {\n    // those methods are called by the legacy contract\n    // and they must ensure msg.sender to be the contract address\n    uint public _totalSupply;\n    function transferByLegacy(address from, address to, uint value) public returns (bool);\n    function transferFromByLegacy(address sender, address from, address spender, uint value) public returns (bool);\n    function approveByLegacy(address from, address spender, uint value) public returns (bool);\n    function increaseApprovalByLegacy(address from, address spender, uint addedValue) public returns (bool);\n    function decreaseApprovalByLegacy(address from, address spender, uint subtractedValue) public returns (bool);\n}\n\n/**\n *    ERC20 TRON Token (TRX)\n */\n\ncontract ERC20TRX is Pausable, StandardTokenWithFees, BlackList {\n\n    address public upgradedAddress;\n    bool public deprecated;\n\n    //  The contract can be initialized with a number of tokens\n    //  All the tokens are deposited to the owner address\n    function ERC20TRX() public {\n        _totalSupply = 0; \n        name = \"TRON\";\n        symbol = \"TRX\";\n        decimals = 6;\n        deprecated = false;\n    }\n\n    // Forward ERC20 methods to upgraded contract if this one is deprecated\n    function transfer(address _to, uint _value) public whenNotPaused returns (bool) {\n        require(!isBlackListed[msg.sender]);\n        if (deprecated) {\n            return UpgradedStandardToken(upgradedAddress).transferByLegacy(msg.sender, _to, _value);\n        } else {\n            return super.transfer(_to, _value);\n        }\n    }\n\n    // Forward ERC20 methods to upgraded contract if this one is deprecated\n    function transferFrom(address _from, address _to, uint _value) public whenNotPaused returns (bool) {\n        require(!isBlackListed[_from]);\n        if (deprecated) {\n            return UpgradedStandardToken(upgradedAddress).transferFromByLegacy(msg.sender, _from, _to, _value);\n        } else {\n            return super.transferFrom(_from, _to, _value);\n        }\n    }\n\n    // Forward ERC20 methods to upgraded contract if this one is deprecated\n    function balanceOf(address who) public constant returns (uint) {\n        if (deprecated) {\n            return UpgradedStandardToken(upgradedAddress).balanceOf(who);\n        } else {\n            return super.balanceOf(who);\n        }\n    }\n\n    // Allow checks of balance at time of deprecation\n    function oldBalanceOf(address who) public constant returns (uint) {\n        if (deprecated) {\n            return super.balanceOf(who);\n        }\n    }\n\n    // Forward ERC20 methods to upgraded contract if this one is deprecated\n    function approve(address _spender, uint _value) public whenNotPaused returns (bool) {\n        if (deprecated) {\n            return UpgradedStandardToken(upgradedAddress).approveByLegacy(msg.sender, _spender, _value);\n        } else {\n            return super.approve(_spender, _value);\n        }\n    }\n\n    function increaseApproval(address _spender, uint _addedValue) public whenNotPaused returns (bool) {\n        if (deprecated) {\n            return UpgradedStandardToken(upgradedAddress).increaseApprovalByLegacy(msg.sender, _spender, _addedValue);\n        } else {\n            return super.increaseApproval(_spender, _addedValue);\n        }\n    }\n\n    function decreaseApproval(address _spender, uint _subtractedValue) public whenNotPaused returns (bool) {\n        if (deprecated) {\n            return UpgradedStandardToken(upgradedAddress).decreaseApprovalByLegacy(msg.sender, _spender, _subtractedValue);\n        } else {\n            return super.decreaseApproval(_spender, _subtractedValue);\n        }\n    }\n\n    // Forward ERC20 methods to upgraded contract if this one is deprecated\n    function allowance(address _owner, address _spender) public constant returns (uint remaining) {\n        if (deprecated) {\n            return StandardToken(upgradedAddress).allowance(_owner, _spender);\n        } else {\n            return super.allowance(_owner, _spender);\n        }\n    }\n\n    // deprecate current contract in favour of a new one\n    function deprecate(address _upgradedAddress) public onlyOwner {\n        require(_upgradedAddress != address(0));\n        deprecated = true;\n        upgradedAddress = _upgradedAddress;\n        Deprecate(_upgradedAddress);\n    }\n\n    // deprecate current contract if favour of a new one\n    function totalSupply() public constant returns (uint) {\n        if (deprecated) {\n            return StandardToken(upgradedAddress).totalSupply();\n        } else {\n            return _totalSupply;\n        }\n    }\n\n    // Issue a new amount of tokens\n    // these tokens are deposited into the owner address\n    //\n    // @param _amount Number of tokens to be issued\n    function issue(uint amount) public onlyOwner {\n        balances[owner] = balances[owner].add(amount);\n        _totalSupply = _totalSupply.add(amount);\n        Issue(amount);\n        Transfer(address(0), owner, amount);\n    }\n\n    // Redeem tokens.\n    // These tokens are withdrawn from the owner address\n    // if the balance must be enough to cover the redeem\n    // or the call will fail.\n    // @param _amount Number of tokens to be issued\n    function redeem(uint amount) public onlyOwner {\n        _totalSupply = _totalSupply.sub(amount);\n        balances[owner] = balances[owner].sub(amount);\n        Redeem(amount);\n        Transfer(owner, address(0), amount);\n    }\n\n    function destroyBlackFunds (address _blackListedUser) public onlyOwner {\n        require(isBlackListed[_blackListedUser]);\n        uint dirtyFunds = balanceOf(_blackListedUser);\n        balances[_blackListedUser] = 0;\n        _totalSupply = _totalSupply.sub(dirtyFunds);\n        DestroyedBlackFunds(_blackListedUser, dirtyFunds);\n    }\n\n    event DestroyedBlackFunds(address indexed _blackListedUser, uint _balance);\n\n    // Called when new token are issued\n    event Issue(uint amount);\n\n    // Called when tokens are redeemed\n    event Redeem(uint amount);\n\n    // Called when contract is deprecated\n    event Deprecate(address newAddress);\n\n}\n"},"Migrations.sol":{"content":"pragma solidity ^0.4.4;\n/* solhint-disable var-name-mixedcase */\n\n\ncontract Migrations {\n    address public owner;\n    uint public last_completed_migration;\n\n    modifier restricted() {\n        if (msg.sender == owner) _;\n    }\n\n    function Migrations() public {\n        owner = msg.sender;\n    }\n\n    function setCompleted(uint completed) public restricted {\n        last_completed_migration = completed;\n    }\n\n    function upgrade(address newAddress) public restricted {\n        Migrations upgraded = Migrations(newAddress);\n        upgraded.setCompleted(last_completed_migration);\n    }\n}\n"},"MultiSigWallet.sol":{"content":"pragma solidity ^0.4.10;\n\n/// @title Multisignature wallet - Allows multiple parties to agree on transactions before execution.\n/// @author Stefan George - \[email protected]\u003e\ncontract MultiSigWallet {\n\n    uint constant public MAX_OWNER_COUNT = 50;\n\n    event Confirmation(address indexed sender, uint indexed transactionId);\n    event Revocation(address indexed sender, uint indexed transactionId);\n    event Submission(uint indexed transactionId);\n    event Execution(uint indexed transactionId);\n    event ExecutionFailure(uint indexed transactionId);\n    event Deposit(address indexed sender, uint value);\n    event OwnerAddition(address indexed owner);\n    event OwnerRemoval(address indexed owner);\n    event RequirementChange(uint required);\n\n    mapping (uint =\u003e Transaction) public transactions;\n    mapping (uint =\u003e mapping (address =\u003e bool)) public confirmations;\n    mapping (address =\u003e bool) public isOwner;\n    address[] public owners;\n    uint public required;\n    uint public transactionCount;\n\n    struct Transaction {\n        address destination;\n        uint value;\n        bytes data;\n        bool executed;\n    }\n\n    modifier onlyWallet() {\n        if (msg.sender != address(this))\n            throw;\n        _;\n    }\n\n    modifier ownerDoesNotExist(address owner) {\n        if (isOwner[owner])\n            throw;\n        _;\n    }\n\n    modifier ownerExists(address owner) {\n        if (!isOwner[owner])\n            throw;\n        _;\n    }\n\n    modifier transactionExists(uint transactionId) {\n        if (transactions[transactionId].destination == 0)\n            throw;\n        _;\n    }\n\n    modifier confirmed(uint transactionId, address owner) {\n        if (!confirmations[transactionId][owner])\n            throw;\n        _;\n    }\n\n    modifier notConfirmed(uint transactionId, address owner) {\n        if (confirmations[transactionId][owner])\n            throw;\n        _;\n    }\n\n    modifier notExecuted(uint transactionId) {\n        if (transactions[transactionId].executed)\n            throw;\n        _;\n    }\n\n    modifier notNull(address _address) {\n        if (_address == 0)\n            throw;\n        _;\n    }\n\n    modifier validRequirement(uint ownerCount, uint _required) {\n        if (   ownerCount \u003e MAX_OWNER_COUNT\n            || _required \u003e ownerCount\n            || _required == 0\n            || ownerCount == 0)\n            throw;\n        _;\n    }\n\n    /// @dev Fallback function allows to deposit ether.\n    function()\n        payable\n    {\n        if (msg.value \u003e 0)\n            Deposit(msg.sender, msg.value);\n    }\n\n    /*\n     * Public functions\n     */\n    /// @dev Contract constructor sets initial owners and required number of confirmations.\n    /// @param _owners List of initial owners.\n    /// @param _required Number of required confirmations.\n    function MultiSigWallet(address[] _owners, uint _required)\n        public\n        validRequirement(_owners.length, _required)\n    {\n        for (uint i=0; i\u003c_owners.length; i++) {\n            if (isOwner[_owners[i]] || _owners[i] == 0)\n                throw;\n            isOwner[_owners[i]] = true;\n        }\n        owners = _owners;\n        required = _required;\n    }\n\n    /// @dev Allows to add a new owner. Transaction has to be sent by wallet.\n    /// @param owner Address of new owner.\n    function addOwner(address owner)\n        public\n        onlyWallet\n        ownerDoesNotExist(owner)\n        notNull(owner)\n        validRequirement(owners.length + 1, required)\n    {\n        isOwner[owner] = true;\n        owners.push(owner);\n        OwnerAddition(owner);\n    }\n\n    /// @dev Allows to remove an owner. Transaction has to be sent by wallet.\n    /// @param owner Address of owner.\n    function removeOwner(address owner)\n        public\n        onlyWallet\n        ownerExists(owner)\n    {\n        isOwner[owner] = false;\n        for (uint i=0; i\u003cowners.length - 1; i++)\n            if (owners[i] == owner) {\n                owners[i] = owners[owners.length - 1];\n                break;\n            }\n        owners.length -= 1;\n        if (required \u003e owners.length)\n            changeRequirement(owners.length);\n        OwnerRemoval(owner);\n    }\n\n    /// @dev Allows to replace an owner with a new owner. Transaction has to be sent by wallet.\n    /// @param owner Address of owner to be replaced.\n    /// @param owner Address of new owner.\n    function replaceOwner(address owner, address newOwner)\n        public\n        onlyWallet\n        ownerExists(owner)\n        ownerDoesNotExist(newOwner)\n    {\n        for (uint i=0; i\u003cowners.length; i++)\n            if (owners[i] == owner) {\n                owners[i] = newOwner;\n                break;\n            }\n        isOwner[owner] = false;\n        isOwner[newOwner] = true;\n        OwnerRemoval(owner);\n        OwnerAddition(newOwner);\n    }\n\n    /// @dev Allows to change the number of required confirmations. Transaction has to be sent by wallet.\n    /// @param _required Number of required confirmations.\n    function changeRequirement(uint _required)\n        public\n        onlyWallet\n        validRequirement(owners.length, _required)\n    {\n        required = _required;\n        RequirementChange(_required);\n    }\n\n    /// @dev Allows an owner to submit and confirm a transaction.\n    /// @param destination Transaction target address.\n    /// @param value Transaction ether value.\n    /// @param data Transaction data payload.\n    /// @return Returns transaction ID.\n    function submitTransaction(address destination, uint value, bytes data)\n        public\n        returns (uint transactionId)\n    {\n        transactionId = addTransaction(destination, value, data);\n        confirmTransaction(transactionId);\n    }\n\n    /// @dev Allows an owner to confirm a transaction.\n    /// @param transactionId Transaction ID.\n    function confirmTransaction(uint transactionId)\n        public\n        ownerExists(msg.sender)\n        transactionExists(transactionId)\n        notConfirmed(transactionId, msg.sender)\n    {\n        confirmations[transactionId][msg.sender] = true;\n        Confirmation(msg.sender, transactionId);\n        executeTransaction(transactionId);\n    }\n\n    /// @dev Allows an owner to revoke a confirmation for a transaction.\n    /// @param transactionId Transaction ID.\n    function revokeConfirmation(uint transactionId)\n        public\n        ownerExists(msg.sender)\n        confirmed(transactionId, msg.sender)\n        notExecuted(transactionId)\n    {\n        confirmations[transactionId][msg.sender] = false;\n        Revocation(msg.sender, transactionId);\n    }\n\n    /// @dev Allows anyone to execute a confirmed transaction.\n    /// @param transactionId Transaction ID.\n    function executeTransaction(uint transactionId)\n        public\n        notExecuted(transactionId)\n    {\n        if (isConfirmed(transactionId)) {\n            Transaction tx = transactions[transactionId];\n            tx.executed = true;\n            if (tx.destination.call.value(tx.value)(tx.data))\n                Execution(transactionId);\n            else {\n                ExecutionFailure(transactionId);\n                tx.executed = false;\n            }\n        }\n    }\n\n    /// @dev Returns the confirmation status of a transaction.\n    /// @param transactionId Transaction ID.\n    /// @return Confirmation status.\n    function isConfirmed(uint transactionId)\n        public\n        constant\n        returns (bool)\n    {\n        uint count = 0;\n        for (uint i=0; i\u003cowners.length; i++) {\n            if (confirmations[transactionId][owners[i]])\n                count += 1;\n            if (count == required)\n                return true;\n        }\n    }\n\n    /*\n     * Internal functions\n     */\n    /// @dev Adds a new transaction to the transaction mapping, if transaction does not exist yet.\n    /// @param destination Transaction target address.\n    /// @param value Transaction ether value.\n    /// @param data Transaction data payload.\n    /// @return Returns transaction ID.\n    function addTransaction(address destination, uint value, bytes data)\n        internal\n        notNull(destination)\n        returns (uint transactionId)\n    {\n        transactionId = transactionCount;\n        transactions[transactionId] = Transaction({\n            destination: destination,\n            value: value,\n            data: data,\n            executed: false\n        });\n        transactionCount += 1;\n        Submission(transactionId);\n    }\n\n    /*\n     * Web3 call functions\n     */\n    /// @dev Returns number of confirmations of a transaction.\n    /// @param transactionId Transaction ID.\n    /// @return Number of confirmations.\n    function getConfirmationCount(uint transactionId)\n        public\n        constant\n        returns (uint count)\n    {\n        for (uint i=0; i\u003cowners.length; i++)\n            if (confirmations[transactionId][owners[i]])\n                count += 1;\n    }\n\n    /// @dev Returns total number of transactions after filers are applied.\n    /// @param pending Include pending transactions.\n    /// @param executed Include executed transactions.\n    /// @return Total number of transactions after filters are applied.\n    function getTransactionCount(bool pending, bool executed)\n        public\n        constant\n        returns (uint count)\n    {\n        for (uint i=0; i\u003ctransactionCount; i++)\n            if (   pending \u0026\u0026 !transactions[i].executed\n                || executed \u0026\u0026 transactions[i].executed)\n                count += 1;\n    }\n\n    /// @dev Returns list of owners.\n    /// @return List of owner addresses.\n    function getOwners()\n        public\n        constant\n        returns (address[])\n    {\n        return owners;\n    }\n\n    /// @dev Returns array with owner addresses, which confirmed transaction.\n    /// @param transactionId Transaction ID.\n    /// @return Returns array of owner addresses.\n    function getConfirmations(uint transactionId)\n        public\n        constant\n        returns (address[] _confirmations)\n    {\n        address[] memory confirmationsTemp = new address[](owners.length);\n        uint count = 0;\n        uint i;\n        for (i=0; i\u003cowners.length; i++)\n            if (confirmations[transactionId][owners[i]]) {\n                confirmationsTemp[count] = owners[i];\n                count += 1;\n            }\n        _confirmations = new address[](count);\n        for (i=0; i\u003ccount; i++)\n            _confirmations[i] = confirmationsTemp[i];\n    }\n\n    /// @dev Returns list of transaction IDs in defined range.\n    /// @param from Index start position of transaction array.\n    /// @param to Index end position of transaction array.\n    /// @param pending Include pending transactions.\n    /// @param executed Include executed transactions.\n    /// @return Returns array of transaction IDs.\n    function getTransactionIds(uint from, uint to, bool pending, bool executed)\n        public\n        constant\n        returns (uint[] _transactionIds)\n    {\n        uint[] memory transactionIdsTemp = new uint[](transactionCount);\n        uint count = 0;\n        uint i;\n        for (i=0; i\u003ctransactionCount; i++)\n            if (   pending \u0026\u0026 !transactions[i].executed\n                || executed \u0026\u0026 transactions[i].executed)\n            {\n                transactionIdsTemp[count] = i;\n                count += 1;\n            }\n        _transactionIds = new uint[](to - from);\n        for (i=from; i\u003cto; i++)\n            _transactionIds[i - from] = transactionIdsTemp[i];\n    }\n}\n"},"Ownable.sol":{"content":"pragma solidity ^0.4.18;\n\n\n/**\n * @title Ownable\n * @dev The Ownable contract has an owner address, and provides basic authorization control\n * functions, this simplifies the implementation of \"user permissions\".\n */\ncontract Ownable {\n  address public owner;\n\n\n  event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);\n\n\n  /**\n   * @dev The Ownable constructor sets the original `owner` of the contract to the sender\n   * account.\n   */\n  function Ownable() public {\n    owner = msg.sender;\n  }\n\n\n  /**\n   * @dev Throws if called by any account other than the owner.\n   */\n  modifier onlyOwner() {\n    require(msg.sender == owner);\n    _;\n  }\n\n\n  /**\n   * @dev Allows the current owner to transfer control of the contract to a newOwner.\n   * @param newOwner The address to transfer ownership to.\n   */\n  function transferOwnership(address newOwner) public onlyOwner {\n    require(newOwner != address(0));\n    OwnershipTransferred(owner, newOwner);\n    owner = newOwner;\n  }\n\n}\n"},"Pausable.sol":{"content":"pragma solidity ^0.4.18;\n\n\nimport \"./Ownable.sol\";\n\n\n/**\n * @title Pausable\n * @dev Base contract which allows children to implement an emergency stop mechanism.\n */\ncontract Pausable is Ownable {\n  event Pause();\n  event Unpause();\n\n  bool public paused = false;\n\n\n  /**\n   * @dev Modifier to make a function callable only when the contract is not paused.\n   */\n  modifier whenNotPaused() {\n    require(!paused);\n    _;\n  }\n\n  /**\n   * @dev Modifier to make a function callable only when the contract is paused.\n   */\n  modifier whenPaused() {\n    require(paused);\n    _;\n  }\n\n  /**\n   * @dev called by the owner to pause, triggers stopped state\n   */\n  function pause() onlyOwner whenNotPaused public {\n    paused = true;\n    Pause();\n  }\n\n  /**\n   * @dev called by the owner to unpause, returns to normal state\n   */\n  function unpause() onlyOwner whenPaused public {\n    paused = false;\n    Unpause();\n  }\n}\n"},"SafeMath.sol":{"content":"pragma solidity ^0.4.18;\n\n\n/**\n * @title SafeMath\n * @dev Math operations with safety checks that throw on error\n */\nlibrary SafeMath {\n  function mul(uint256 a, uint256 b) internal pure returns (uint256) {\n    if (a == 0) {\n      return 0;\n    }\n    uint256 c = a * b;\n    assert(c / a == b);\n    return c;\n  }\n\n  function div(uint256 a, uint256 b) internal pure returns (uint256) {\n    // assert(b \u003e 0); // Solidity automatically throws when dividing by 0\n    uint256 c = a / b;\n    // assert(a == b * c + a % b); // There is no case in which this doesn\u0027t hold\n    return c;\n  }\n\n  function sub(uint256 a, uint256 b) internal pure returns (uint256) {\n    assert(b \u003c= a);\n    return a - b;\n  }\n\n  function add(uint256 a, uint256 b) internal pure returns (uint256) {\n    uint256 c = a + b;\n    assert(c \u003e= a);\n    return c;\n  }\n}\n"},"StandardToken.sol":{"content":"pragma solidity ^0.4.18;\n\n\nimport \u0027./BasicToken.sol\u0027;\n\n\n/**\n * @title ERC20 interface\n */\ncontract ERC20 is ERC20Basic {\n  function allowance(address owner, address spender) public view returns (uint256);\n  function transferFrom(address from, address to, uint256 value) public returns (bool);\n  function approve(address spender, uint256 value) public returns (bool);\n  event Approval(address indexed owner, address indexed spender, uint256 value);\n}\n\n/**\n * @title Standard ERC20 token\n *\n * @dev Implementation of the basic standard token.\n */\ncontract StandardToken is ERC20, BasicToken {\n\n  mapping (address =\u003e mapping (address =\u003e uint256)) internal allowed;\n\n\n  /**\n   * @dev Transfer tokens from one address to another\n   * @param _from address The address which you want to send tokens from\n   * @param _to address The address which you want to transfer to\n   * @param _value uint256 the amount of tokens to be transferred\n   */\n  function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {\n    require(_to != address(0));\n    require(_value \u003c= balances[_from]);\n    require(_value \u003c= allowed[_from][msg.sender]);\n\n    balances[_from] = balances[_from].sub(_value);\n    balances[_to] = balances[_to].add(_value);\n    allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);\n    Transfer(_from, _to, _value);\n    return true;\n  }\n\n  /**\n   * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.\n   *\n   * Beware that changing an allowance with this method brings the risk that someone may use both the old\n   * and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this\n   * race condition is to first reduce the spender\u0027s allowance to 0 and set the desired value afterwards:\n   * @param _spender The address which will spend the funds.\n   * @param _value The amount of tokens to be spent.\n   */\n  function approve(address _spender, uint256 _value) public returns (bool) {\n    allowed[msg.sender][_spender] = _value;\n    Approval(msg.sender, _spender, _value);\n    return true;\n  }\n\n  /**\n   * @dev Function to check the amount of tokens that an owner allowed to a spender.\n   * @param _owner address The address which owns the funds.\n   * @param _spender address The address which will spend the funds.\n   * @return A uint256 specifying the amount of tokens still available for the spender.\n   */\n  function allowance(address _owner, address _spender) public view returns (uint256) {\n    return allowed[_owner][_spender];\n  }\n\n  /**\n   * approve should be called when allowed[_spender] == 0. To increment\n   * allowed value is better to use this function to avoid 2 calls (and wait until\n   * the first transaction is mined)\n   * From MonolithDAO Token.sol\n   */\n  function increaseApproval(address _spender, uint _addedValue) public returns (bool) {\n    allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);\n    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);\n    return true;\n  }\n\n  function decreaseApproval(address _spender, uint _subtractedValue) public returns (bool) {\n    uint oldValue = allowed[msg.sender][_spender];\n    if (_subtractedValue \u003e oldValue) {\n      allowed[msg.sender][_spender] = 0;\n    } else {\n      allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);\n    }\n    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);\n    return true;\n  }\n\n}\n"},"StandardTokenWithFees.sol":{"content":"pragma solidity ^0.4.18;\n\nimport \"./StandardToken.sol\";\nimport \"./Ownable.sol\";\n\ncontract StandardTokenWithFees is StandardToken, Ownable {\n\n  // Additional variables for use if transaction fees ever became necessary\n  uint256 public basisPointsRate = 0;\n  uint256 public maximumFee = 0;\n  uint256 constant MAX_SETTABLE_BASIS_POINTS = 20;\n  uint256 constant MAX_SETTABLE_FEE = 50;\n\n  string public name;\n  string public symbol;\n  uint8 public decimals;\n  uint public _totalSupply;\n\n  uint public constant MAX_UINT = 2**256 - 1;\n\n  function calcFee(uint _value) constant returns (uint) {\n    uint fee = (_value.mul(basisPointsRate)).div(10000);\n    if (fee \u003e maximumFee) {\n        fee = maximumFee;\n    }\n    return fee;\n  }\n\n  function transfer(address _to, uint _value) public returns (bool) {\n    uint fee = calcFee(_value);\n    uint sendAmount = _value.sub(fee);\n\n    super.transfer(_to, sendAmount);\n    if (fee \u003e 0) {\n      super.transfer(owner, fee);\n    }\n    return true;\n  }\n\n  function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {\n    require(_to != address(0));\n    require(_value \u003c= balances[_from]);\n    require(_value \u003c= allowed[_from][msg.sender]);\n\n    uint fee = calcFee(_value);\n    uint sendAmount = _value.sub(fee);\n\n    balances[_from] = balances[_from].sub(_value);\n    balances[_to] = balances[_to].add(sendAmount);\n    if (allowed[_from][msg.sender] \u003c MAX_UINT) {\n        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);\n    }\n    Transfer(_from, _to, sendAmount);\n    if (fee \u003e 0) {\n      balances[owner] = balances[owner].add(fee);\n      Transfer(_from, owner, fee);\n    }\n    return true;\n  }\n\n  function setParams(uint newBasisPoints, uint newMaxFee) public onlyOwner {\n      // Ensure transparency by hardcoding limit beyond which fees can never be added\n      require(newBasisPoints \u003c MAX_SETTABLE_BASIS_POINTS);\n      require(newMaxFee \u003c MAX_SETTABLE_FEE);\n\n      basisPointsRate = newBasisPoints;\n      maximumFee = newMaxFee.mul(uint(10)**decimals);\n\n      Params(basisPointsRate, maximumFee);\n  }\n\n  // Called if contract ever adds fees\n  event Params(uint feeBasisPoints, uint maxFee);\n\n}\n"}}