ETH Price: $2,627.43 (+3.45%)

Transaction Decoder

Block:
7886604 at Jun-03-2019 01:06:38 PM +UTC
Transaction Fee:
0.00033583 ETH $0.88
Gas Used:
33,583 Gas / 10 Gwei

Emitted Events:

84 ZilliqaToken.Transfer( from=[Receiver] TokenStore, to=[Sender] 0x343a3c7f789335c9ea60932d34be258f643678d9, value=10000000000000 )
85 TokenStore.Withdraw( token=ZilliqaToken, user=[Sender] 0x343a3c7f789335c9ea60932d34be258f643678d9, amount=10000000000000, balance=0 )

Account State Difference:

  Address   Before After State Difference Code
0x05f4a42e...cEF1FAD27
0x1cE7AE55...ee6Ee33D8
(Token.Store)
0x343a3C7F...F643678d9
0.086540868583029672 Eth
Nonce: 192
0.086205038583029672 Eth
Nonce: 193
0.00033583
30.947970696142318071 Eth30.948306526142318071 Eth0.00033583

Execution Trace

TokenStore.withdrawToken( _token=0x05f4a42e251f2d52b8ed15E9FEdAacFcEF1FAD27, _amount=10000000000000 )
  • ZilliqaToken.transfer( _to=0x343a3C7F789335C9EA60932D34bE258F643678d9, _value=10000000000000 ) => ( True )
    File 1 of 2: TokenStore
    pragma solidity ^0.4.11;
    
    // ERC20 token protocol, see more details at
    // https://theethereum.wiki/w/index.php/ERC20_Token_Standard
    // And also https://github.com/ethereum/eips/issues/20
    
    contract Token {
      function totalSupply() constant returns (uint256 supply);
      function balanceOf(address _owner) constant returns (uint256 balance);
      function transfer(address _to, uint256 _value) returns (bool success);
      function transferFrom(address _from, address _to, uint256 _value) returns (bool success);
      function approve(address _spender, uint256 _value) returns (bool success);
      function allowance(address _owner, address _spender) constant returns (uint256 remaining);
    
      event Transfer(address indexed _from, address indexed _to, uint256 _value);
      event Approval(address indexed _owner, address indexed _spender, uint256 _value);
    }
    
    // Safe mathematics to make the code more readable
    
    contract SafeMath {
      function safeMul(uint a, uint b) internal returns (uint) {
        uint c = a * b;
        assert(a == 0 || c / a == b);
        return c;
      }
    
      function safeSub(uint a, uint b) internal returns (uint) {
        assert(b <= a);
        return a - b;
      }
    
      function safeAdd(uint a, uint b) internal returns (uint) {
        uint c = a + b;
        assert(c>=a && c>=b);
        return c;
      }
    }
    
    // Ownable interface to simplify owner checks
    
    contract Ownable {
      address public owner;
    
      function Ownable() {
        owner = msg.sender;
      }
    
      modifier onlyOwner() {
        require(msg.sender == owner);
        _;
      }
    
      function transferOwnership(address _newOwner) onlyOwner {
        require(_newOwner != address(0));
        owner = _newOwner;
      }
    }
    
    // Interface for trading discounts and rebates for specific accounts
    
    contract AccountModifiersInterface {
      function accountModifiers(address _user) constant returns(uint takeFeeDiscount, uint rebatePercentage);
      function tradeModifiers(address _maker, address _taker) constant returns(uint takeFeeDiscount, uint rebatePercentage);
    }
    
    // Interface for trade tacker
    
    contract TradeTrackerInterface {
      function tradeComplete(address _tokenGet, uint _amountGet, address _tokenGive, uint _amountGive, address _get, address _give, uint _takerFee, uint _makerRebate);
    }
    
    // Exchange contract
    
    contract TokenStore is SafeMath, Ownable {
    
      // The account that will receive fees
      address feeAccount;
    
      // The account that stores fee discounts/rebates
      address accountModifiers;
      
      // Trade tracker account
      address tradeTracker;
    
      // We charge only the takers and this is the fee, percentage times 1 ether
      uint public fee;
    
      // Mapping of token addresses to mapping of account balances (token 0 means Ether)
      mapping (address => mapping (address => uint)) public tokens;
    
      // Mapping of user accounts to mapping of order hashes to uints (amount of order that has been filled)
      mapping (address => mapping (bytes32 => uint)) public orderFills;
      
      // Address of a next and previous versions of the contract, also status of the contract
      // can be used for user-triggered fund migrations
      address public successor;
      address public predecessor;
      bool public deprecated;
      uint16 public version;
    
      // Logging events
      // Note: Order creation is handled off-chain, see explanation further below
      event Cancel(address tokenGet, uint amountGet, address tokenGive, uint amountGive, uint expires, uint nonce, address user, uint8 v, bytes32 r, bytes32 s);
      event Trade(address tokenGet, uint amountGet, address tokenGive, uint amountGive, address get, address give, uint nonce);
      event Deposit(address token, address user, uint amount, uint balance);
      event Withdraw(address token, address user, uint amount, uint balance);
      event FundsMigrated(address user);
    
      function TokenStore(uint _fee, address _predecessor) {
        feeAccount = owner;
        fee = _fee;
        predecessor = _predecessor;
        deprecated = false;
        if (predecessor != address(0)) {
          version = TokenStore(predecessor).version() + 1;
        } else {
          version = 1;
        }
      }
    
      // Throw on default handler to prevent direct transactions of Ether
      function() {
        revert();
      }
      
      modifier deprecable() {
        require(!deprecated);
        _;
      }
    
      function deprecate(bool _deprecated, address _successor) onlyOwner {
        deprecated = _deprecated;
        successor = _successor;
      }
    
      function changeFeeAccount(address _feeAccount) onlyOwner {
        require(_feeAccount != address(0));
        feeAccount = _feeAccount;
      }
    
      function changeAccountModifiers(address _accountModifiers) onlyOwner {
        accountModifiers = _accountModifiers;
      }
      
      function changeTradeTracker(address _tradeTracker) onlyOwner {
        tradeTracker = _tradeTracker;
      }
    
      // Fee can only be decreased!
      function changeFee(uint _fee) onlyOwner {
        require(_fee <= fee);
        fee = _fee;
      }
      
      // Allows a user to get her current discount/rebate
      function getAccountModifiers() constant returns(uint takeFeeDiscount, uint rebatePercentage) {
        if (accountModifiers != address(0)) {
          return AccountModifiersInterface(accountModifiers).accountModifiers(msg.sender);
        } else {
          return (0, 0);
        }
      }
      
      ////////////////////////////////////////////////////////////////////////////////
      // Deposits, withdrawals, balances
      ////////////////////////////////////////////////////////////////////////////////
    
      function deposit() payable deprecable {
        tokens[0][msg.sender] = safeAdd(tokens[0][msg.sender], msg.value);
        Deposit(0, msg.sender, msg.value, tokens[0][msg.sender]);
      }
    
      function withdraw(uint _amount) {
        require(tokens[0][msg.sender] >= _amount);
        tokens[0][msg.sender] = safeSub(tokens[0][msg.sender], _amount);
        if (!msg.sender.call.value(_amount)()) {
          revert();
        }
        Withdraw(0, msg.sender, _amount, tokens[0][msg.sender]);
      }
    
      function depositToken(address _token, uint _amount) deprecable {
        // Note that Token(_token).approve(this, _amount) needs to be called
        // first or this contract will not be able to do the transfer.
        require(_token != 0);
        if (!Token(_token).transferFrom(msg.sender, this, _amount)) {
          revert();
        }
        tokens[_token][msg.sender] = safeAdd(tokens[_token][msg.sender], _amount);
        Deposit(_token, msg.sender, _amount, tokens[_token][msg.sender]);
      }
    
      function withdrawToken(address _token, uint _amount) {
        require(_token != 0);
        require(tokens[_token][msg.sender] >= _amount);
        tokens[_token][msg.sender] = safeSub(tokens[_token][msg.sender], _amount);
        if (!Token(_token).transfer(msg.sender, _amount)) {
          revert();
        }
        Withdraw(_token, msg.sender, _amount, tokens[_token][msg.sender]);
      }
    
      function balanceOf(address _token, address _user) constant returns (uint) {
        return tokens[_token][_user];
      }
      
      ////////////////////////////////////////////////////////////////////////////////
      // Trading
      ////////////////////////////////////////////////////////////////////////////////
    
      // Note: Order creation happens off-chain but the orders are signed by creators,
      // we validate the contents and the creator address in the logic below
    
      function trade(address _tokenGet, uint _amountGet, address _tokenGive, uint _amountGive,
          uint _expires, uint _nonce, address _user, uint8 _v, bytes32 _r, bytes32 _s, uint _amount) {
        bytes32 hash = sha256(this, _tokenGet, _amountGet, _tokenGive, _amountGive, _expires, _nonce);
        // Check order signatures and expiration, also check if not fulfilled yet
    		if (ecrecover(sha3("\x19Ethereum Signed Message:\n32", hash), _v, _r, _s) != _user ||
          block.number > _expires ||
          safeAdd(orderFills[_user][hash], _amount) > _amountGet) {
          revert();
        }
        tradeBalances(_tokenGet, _amountGet, _tokenGive, _amountGive, _user, msg.sender, _amount);
        orderFills[_user][hash] = safeAdd(orderFills[_user][hash], _amount);
        Trade(_tokenGet, _amount, _tokenGive, _amountGive * _amount / _amountGet, _user, msg.sender, _nonce);
      }
      
      function tradeBalances(address _tokenGet, uint _amountGet, address _tokenGive, uint _amountGive,
          address _user, address _caller, uint _amount) private {
    
        uint feeTakeValue = safeMul(_amount, fee) / (1 ether);
        uint rebateValue = 0;
        uint tokenGiveValue = safeMul(_amountGive, _amount) / _amountGet; // Proportionate to request ratio
    
        // Apply modifiers
        if (accountModifiers != address(0)) {
          var (feeTakeDiscount, rebatePercentage) = AccountModifiersInterface(accountModifiers).tradeModifiers(_user, _caller);
          // Check that the discounts/rebates are never higher then 100%
          if (feeTakeDiscount > 100) {
            feeTakeDiscount = 0;
          }
          if (rebatePercentage > 100) {
            rebatePercentage = 0;
          }
          feeTakeValue = safeMul(feeTakeValue, 100 - feeTakeDiscount) / 100;  // discounted fee
          rebateValue = safeMul(rebatePercentage, feeTakeValue) / 100;        // % of actual taker fee
        }
        
        tokens[_tokenGet][_user] = safeAdd(tokens[_tokenGet][_user], safeAdd(_amount, rebateValue));
        tokens[_tokenGet][_caller] = safeSub(tokens[_tokenGet][_caller], safeAdd(_amount, feeTakeValue));
        tokens[_tokenGive][_user] = safeSub(tokens[_tokenGive][_user], tokenGiveValue);
        tokens[_tokenGive][_caller] = safeAdd(tokens[_tokenGive][_caller], tokenGiveValue);
        tokens[_tokenGet][feeAccount] = safeAdd(tokens[_tokenGet][feeAccount], safeSub(feeTakeValue, rebateValue));
        
        if (tradeTracker != address(0)) {
          TradeTrackerInterface(tradeTracker).tradeComplete(_tokenGet, _amount, _tokenGive, tokenGiveValue, _user, _caller, feeTakeValue, rebateValue);
        }
      }
    
      function testTrade(address _tokenGet, uint _amountGet, address _tokenGive, uint _amountGive, uint _expires,
          uint _nonce, address _user, uint8 _v, bytes32 _r, bytes32 _s, uint _amount, address _sender) constant returns(bool) {
        if (tokens[_tokenGet][_sender] < _amount ||
          availableVolume(_tokenGet, _amountGet, _tokenGive, _amountGive, _expires, _nonce, _user, _v, _r, _s) < _amount) {
          return false;
        }
        return true;
      }
    
      function availableVolume(address _tokenGet, uint _amountGet, address _tokenGive, uint _amountGive, uint _expires,
          uint _nonce, address _user, uint8 _v, bytes32 _r, bytes32 _s) constant returns(uint) {
        bytes32 hash = sha256(this, _tokenGet, _amountGet, _tokenGive, _amountGive, _expires, _nonce);
        if (ecrecover(sha3("\x19Ethereum Signed Message:\n32", hash), _v, _r, _s) != _user ||
          block.number > _expires) {
          return 0;
        }
        uint available1 = safeSub(_amountGet, orderFills[_user][hash]);
        uint available2 = safeMul(tokens[_tokenGive][_user], _amountGet) / _amountGive;
        if (available1 < available2) return available1;
        return available2;
      }
    
      function amountFilled(address _tokenGet, uint _amountGet, address _tokenGive, uint _amountGive, uint _expires,
          uint _nonce, address _user) constant returns(uint) {
        bytes32 hash = sha256(this, _tokenGet, _amountGet, _tokenGive, _amountGive, _expires, _nonce);
        return orderFills[_user][hash];
      }
    
      function cancelOrder(address _tokenGet, uint _amountGet, address _tokenGive, uint _amountGive, uint _expires,
          uint _nonce, uint8 _v, bytes32 _r, bytes32 _s) {
        bytes32 hash = sha256(this, _tokenGet, _amountGet, _tokenGive, _amountGive, _expires, _nonce);
        if (!(ecrecover(sha3("\x19Ethereum Signed Message:\n32", hash), _v, _r, _s) == msg.sender)) {
          revert();
        }
        orderFills[msg.sender][hash] = _amountGet;
        Cancel(_tokenGet, _amountGet, _tokenGive, _amountGive, _expires, _nonce, msg.sender, _v, _r, _s);
      }
      
      ////////////////////////////////////////////////////////////////////////////////
      // Migrations
      ////////////////////////////////////////////////////////////////////////////////
    
      // User-triggered (!) fund migrations in case contract got updated
      // Similar to withdraw but we use a successor account instead
      // As we don't store user tokens list on chain, it has to be passed from the outside
      function migrateFunds(address[] _tokens) {
      
        // Get the latest successor in the chain
        require(successor != address(0));
        TokenStore newExchange = TokenStore(successor);
        for (uint16 n = 0; n < 20; n++) {  // We will look past 20 contracts in the future
          address nextSuccessor = newExchange.successor();
          if (nextSuccessor == address(this)) {  // Circular succession
            revert();
          }
          if (nextSuccessor == address(0)) { // We reached the newest, stop
            break;
          }
          newExchange = TokenStore(nextSuccessor);
        }
    
        // Ether
        uint etherAmount = tokens[0][msg.sender];
        if (etherAmount > 0) {
          tokens[0][msg.sender] = 0;
          newExchange.depositForUser.value(etherAmount)(msg.sender);
        }
    
        // Tokens
        for (n = 0; n < _tokens.length; n++) {
          address token = _tokens[n];
          require(token != address(0)); // 0 = Ether, we handle it above
          uint tokenAmount = tokens[token][msg.sender];
          if (tokenAmount == 0) {
            continue;
          }
          if (!Token(token).approve(newExchange, tokenAmount)) {
            revert();
          }
          tokens[token][msg.sender] = 0;
          newExchange.depositTokenForUser(token, tokenAmount, msg.sender);
        }
    
        FundsMigrated(msg.sender);
      }
    
      // This is used for migrations only. To be called by previous exchange only,
      // user-triggered, on behalf of the user called the migrateFunds method.
      // Note that it does exactly the same as depositToken, but as this is called
      // by a previous generation of exchange itself, we credit internally not the
      // previous exchange, but the user it was called for.
      function depositForUser(address _user) payable deprecable {
        require(_user != address(0));
        require(msg.value > 0);
        TokenStore caller = TokenStore(msg.sender);
        require(caller.version() > 0); // Make sure it's an exchange account
        tokens[0][_user] = safeAdd(tokens[0][_user], msg.value);
      }
    
      function depositTokenForUser(address _token, uint _amount, address _user) deprecable {
        require(_token != address(0));
        require(_user != address(0));
        require(_amount > 0);
        TokenStore caller = TokenStore(msg.sender);
        require(caller.version() > 0); // Make sure it's an exchange account
        if (!Token(_token).transferFrom(msg.sender, this, _amount)) {
          revert();
        }
        tokens[_token][_user] = safeAdd(tokens[_token][_user], _amount);
      }
    }

    File 2 of 2: ZilliqaToken
    pragma solidity ^0.4.18;
    
    /**
     * @title ERC20Basic
     * @dev Simpler version of ERC20 interface
     * @dev see https://github.com/ethereum/EIPs/issues/179
     */
    contract ERC20Basic {
      uint256 public totalSupply;
      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);
    }
    
    /**
     * @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);
    }
    
    
    /**
     * @title SafeMath
     * @dev Math operations with safety checks that throw on error
     */
    library SafeMath {
      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;
      }
    
      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 c;
      }
    
      function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b <= a);
        return a - b;
      }
    
      function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        assert(c >= a);
        return c;
      }
    }
    
    
    /**
     * @title Basic token
     * @dev Basic version of StandardToken, with no allowances.
     */
    contract BasicToken is ERC20Basic {
      using SafeMath for uint256;
    
      mapping(address => uint256) balances;
    
      /**
      * @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]);
    
        // SafeMath.sub will throw if there is not enough balance.
        balances[msg.sender] = balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(_value);
        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];
      }
    
    }
    
    /**
     * @title Standard ERC20 token
     *
     * @dev Implementation of the basic standard token.
     * @dev https://github.com/ethereum/EIPs/issues/20
     * @dev 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(_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);
        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;
        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];
      }
    
      /**
       * 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
       */
      function increaseApproval(address _spender, uint _addedValue) public returns (bool) {
        allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
        Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
        return true;
      }
    
      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);
        }
        Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
        return true;
      }
    
    }
    
    /**
     * @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 OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    
    
      /**
       * @dev The Ownable constructor sets the original `owner` of the contract to the sender
       * account.
       */
      function Ownable() 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));
        OwnershipTransferred(owner, newOwner);
        owner = newOwner;
      }
    
    }
    
    /**
     * @title Pausable
     * @dev Base contract which allows children to implement an emergency stop mechanism.
     */
    contract Pausable is Ownable {
      event PausePublic(bool newState);
      event PauseOwnerAdmin(bool newState);
    
      bool public pausedPublic = true;
      bool public pausedOwnerAdmin = false;
    
      address public admin;
    
      /**
       * @dev Modifier to make a function callable based on pause states.
       */
      modifier whenNotPaused() {
        if(pausedPublic) {
          if(!pausedOwnerAdmin) {
            require(msg.sender == admin || msg.sender == owner);
          } else {
            revert();
          }
        }
        _;
      }
    
      /**
       * @dev called by the owner to set new pause flags
       * pausedPublic can't be false while pausedOwnerAdmin is true
       */
      function pause(bool newPausedPublic, bool newPausedOwnerAdmin) onlyOwner public {
        require(!(newPausedPublic == false && newPausedOwnerAdmin == true));
    
        pausedPublic = newPausedPublic;
        pausedOwnerAdmin = newPausedOwnerAdmin;
    
        PausePublic(newPausedPublic);
        PauseOwnerAdmin(newPausedOwnerAdmin);
      }
    }
    
    contract PausableToken is StandardToken, Pausable {
    
      function transfer(address _to, uint256 _value) public whenNotPaused returns (bool) {
        return super.transfer(_to, _value);
      }
    
      function transferFrom(address _from, address _to, uint256 _value) public whenNotPaused returns (bool) {
        return super.transferFrom(_from, _to, _value);
      }
    
      function approve(address _spender, uint256 _value) public whenNotPaused returns (bool) {
        return super.approve(_spender, _value);
      }
    
      function increaseApproval(address _spender, uint _addedValue) public whenNotPaused returns (bool success) {
        return super.increaseApproval(_spender, _addedValue);
      }
    
      function decreaseApproval(address _spender, uint _subtractedValue) public whenNotPaused returns (bool success) {
        return super.decreaseApproval(_spender, _subtractedValue);
      }
    }
    
    
    contract ZilliqaToken is PausableToken {
        string  public  constant name = "Zilliqa";
        string  public  constant symbol = "ZIL";
        uint8   public  constant decimals = 12;
    
        modifier validDestination( address to )
        {
            require(to != address(0x0));
            require(to != address(this));
            _;
        }
    
        function ZilliqaToken( address _admin, uint _totalTokenAmount ) 
        {
            // assign the admin account
            admin = _admin;
    
            // assign the total tokens to zilliqa
            totalSupply = _totalTokenAmount;
            balances[msg.sender] = _totalTokenAmount;
            Transfer(address(0x0), msg.sender, _totalTokenAmount);
        }
    
        function transfer(address _to, uint _value) validDestination(_to) returns (bool) 
        {
            return super.transfer(_to, _value);
        }
    
        function transferFrom(address _from, address _to, uint _value) validDestination(_to) returns (bool) 
        {
            return super.transferFrom(_from, _to, _value);
        }
    
        event Burn(address indexed _burner, uint _value);
    
        function burn(uint _value) returns (bool)
        {
            balances[msg.sender] = balances[msg.sender].sub(_value);
            totalSupply = totalSupply.sub(_value);
            Burn(msg.sender, _value);
            Transfer(msg.sender, address(0x0), _value);
            return true;
        }
    
        // save some gas by making only one contract call
        function burnFrom(address _from, uint256 _value) returns (bool) 
        {
            assert( transferFrom( _from, msg.sender, _value ) );
            return burn(_value);
        }
    
        function emergencyERC20Drain( ERC20 token, uint amount ) onlyOwner {
            // owner can drain tokens that are sent here by mistake
            token.transfer( owner, amount );
        }
    
        event AdminTransferred(address indexed previousAdmin, address indexed newAdmin);
    
        function changeAdmin(address newAdmin) onlyOwner {
            // owner can re-assign the admin
            AdminTransferred(admin, newAdmin);
            admin = newAdmin;
        }
    }