ETH Price: $1,911.17 (-2.80%)

Transaction Decoder

Block:
9057150 at Dec-05-2019 10:01:02 PM +UTC
Transaction Fee:
0.00009963 ETH $0.19
Gas Used:
66,420 Gas / 1.5 Gwei

Emitted Events:

152 UtilitiesRegistry.0x1574f38b4177bf7b6e7244d514e25a8105cc5bdb393ebdc6189a45faac4b359d( 0x1574f38b4177bf7b6e7244d514e25a8105cc5bdb393ebdc6189a45faac4b359d, 0000000000000000000000001afe31a1c95042322dc370b2c40c90975d02522c, 0000000000000000000000002a978682d367ae1522ffde1b288498b295faa2e2, 00000000000000000000000000000000000000000000000000f633fb9aef4000, 000000000000000000000000000000000000000000000000000000000000473a, 0000000000000000000000000000000000000000000000000000000000000000, 0000000000000000000000000000000000000000000000000000000000000000 )
153 Token.Transfer( from=[Sender] 0x1afe31a1c95042322dc370b2c40c90975d02522c, to=0x2a978682d367aE1522FFDe1b288498B295Faa2E2, value=69300000000000000 )
154 Token.Approval( owner=[Sender] 0x1afe31a1c95042322dc370b2c40c90975d02522c, spender=[Receiver] UtilitiesRegistry, value=99643724700000000000000 )

Account State Difference:

  Address   Before After State Difference Code
0x1Afe31a1...75d02522C
0.0073803475 Eth
Nonce: 68
0.0072807175 Eth
Nonce: 69
0.00009963
0xd235958d...b5a614BFF
(Ethermine)
450.841523966893435244 Eth450.841623596893435244 Eth0.00009963

Execution Trace

UtilitiesRegistry.b76020e4( )
  • 0xedd1d886788af0a3944f353d474707ccb53f310c.b76020e4( )
    • Token.transferFrom( sender=0x1Afe31a1c95042322dC370B2c40c90975d02522C, recipient=0x2a978682d367aE1522FFDe1b288498B295Faa2E2, amount=69300000000000000 ) => ( True )
      File 1 of 2: UtilitiesRegistry
      // File: contracts\UtilitiesStorage.sol
      
      pragma solidity ^0.4.21;
      
      contract UtilitiesStorage {
      
      	uint public constant ROLE_BIDDER = 1;
      	uint public constant ROLE_ADVERTISER = 2;
      	uint public constant ROLE_PUBLISHER = 3;
      	uint public constant ROLE_VOTER = 4;
      
      	address public CONTRACT_MEMBERS;
      	address public CONTRACT_TOKEN;
      
      	mapping (address => mapping (address => uint256)) deposits;
      }
      
      // File: node_modules\openzeppelin-solidity\contracts\ownership\Ownable.sol
      
      pragma solidity ^0.4.24;
      
      /**
       * @title Ownable
       * @dev The Ownable contract has an owner address, and provides basic authorization control
       * functions, this simplifies the implementation of "user permissions".
       */
      contract Ownable {
        address private _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() internal {
          _owner = msg.sender;
          emit OwnershipTransferred(address(0), _owner);
        }
      
        /**
         * @return the address of the owner.
         */
        function owner() public view returns(address) {
          return _owner;
        }
      
        /**
         * @dev Throws if called by any account other than the owner.
         */
        modifier onlyOwner() {
          require(isOwner());
          _;
        }
      
        /**
         * @return true if `msg.sender` is the owner of the contract.
         */
        function isOwner() public view returns(bool) {
          return msg.sender == _owner;
        }
      
        /**
         * @dev Allows the current owner to relinquish control of the contract.
         * @notice Renouncing to ownership will leave the contract without an owner.
         * It will not be possible to call the functions with the `onlyOwner`
         * modifier anymore.
         */
        function renounceOwnership() public onlyOwner {
          emit OwnershipTransferred(_owner, address(0));
          _owner = address(0);
        }
      
        /**
         * @dev Allows the current owner to transfer control of the contract to a newOwner.
         * @param newOwner The address to transfer ownership to.
         */
        function transferOwnership(address newOwner) public onlyOwner {
          _transferOwnership(newOwner);
        }
      
        /**
         * @dev Transfers control of the contract to a newOwner.
         * @param newOwner The address to transfer ownership to.
         */
        function _transferOwnership(address newOwner) internal {
          require(newOwner != address(0));
          emit OwnershipTransferred(_owner, newOwner);
          _owner = newOwner;
        }
      }
      
      // File: contracts\UtilitiesRegistry.sol
      
      pragma solidity ^0.4.21;
      
      
      
      contract UtilitiesRegistry is UtilitiesStorage, Ownable {
      
      	address private CONTRACT_ADDRESS;
      
      	function setContractAddress(address newContractAddress) public onlyOwner {
      		CONTRACT_ADDRESS = newContractAddress;
      	}
      
      	function () payable public {
      		address target = CONTRACT_ADDRESS;
      		assembly {
      			// Copy the data sent to the memory address starting free mem position
      			let ptr := mload(0x40)
      			calldatacopy(ptr, 0, calldatasize)
      			// Proxy the call to the contract address with the provided gas and data
      			let result := delegatecall(gas, target, ptr, calldatasize, 0, 0)
      			// Copy the data returned by the proxied call to memory
      			let size := returndatasize
      			returndatacopy(ptr, 0, size)
      			// Check what the result is, return and revert accordingly
      			switch result
      			case 0 { revert(ptr, size) }
      			case 1 { return(ptr, size) }
      		}
      	}
      }

      File 2 of 2: Token
      // File: node_modules\openzeppelin-solidity\contracts\GSN\Context.sol
      
      pragma solidity ^0.5.0;
      
      /*
       * @dev Provides information about the current execution context, including the
       * sender of the transaction and its data. While these are generally available
       * via msg.sender and msg.data, they should not be accessed in such a direct
       * manner, since when dealing with GSN meta-transactions the account sending and
       * paying for execution may not be the actual sender (as far as an application
       * is concerned).
       *
       * This contract is only required for intermediate, library-like contracts.
       */
      contract Context {
          // Empty internal constructor, to prevent people from mistakenly deploying
          // an instance of this contract, which should be used via inheritance.
          constructor () internal { }
          // solhint-disable-previous-line no-empty-blocks
      
          function _msgSender() internal view returns (address payable) {
              return msg.sender;
          }
      
          function _msgData() internal view returns (bytes memory) {
              this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
              return msg.data;
          }
      }
      
      // File: node_modules\openzeppelin-solidity\contracts\ownership\Ownable.sol
      
      pragma solidity ^0.5.0;
      
      /**
       * @dev Contract module which provides a basic access control mechanism, where
       * there is an account (an owner) that can be granted exclusive access to
       * specific functions.
       *
       * This module is used through inheritance. It will make available the modifier
       * `onlyOwner`, which can be applied to your functions to restrict their use to
       * the owner.
       */
      contract Ownable is Context {
          address private _owner;
      
          event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
      
          /**
           * @dev Initializes the contract setting the deployer as the initial owner.
           */
          constructor () internal {
              _owner = _msgSender();
              emit OwnershipTransferred(address(0), _owner);
          }
      
          /**
           * @dev Returns the address of the current owner.
           */
          function owner() public view returns (address) {
              return _owner;
          }
      
          /**
           * @dev Throws if called by any account other than the owner.
           */
          modifier onlyOwner() {
              require(isOwner(), "Ownable: caller is not the owner");
              _;
          }
      
          /**
           * @dev Returns true if the caller is the current owner.
           */
          function isOwner() public view returns (bool) {
              return _msgSender() == _owner;
          }
      
          /**
           * @dev Leaves the contract without owner. It will not be possible to call
           * `onlyOwner` functions anymore. Can only be called by the current owner.
           *
           * NOTE: Renouncing ownership will leave the contract without an owner,
           * thereby removing any functionality that is only available to the owner.
           */
          function renounceOwnership() public onlyOwner {
              emit OwnershipTransferred(_owner, address(0));
              _owner = address(0);
          }
      
          /**
           * @dev Transfers ownership of the contract to a new account (`newOwner`).
           * Can only be called by the current owner.
           */
          function transferOwnership(address newOwner) public onlyOwner {
              _transferOwnership(newOwner);
          }
      
          /**
           * @dev Transfers ownership of the contract to a new account (`newOwner`).
           */
          function _transferOwnership(address newOwner) internal {
              require(newOwner != address(0), "Ownable: new owner is the zero address");
              emit OwnershipTransferred(_owner, newOwner);
              _owner = newOwner;
          }
      }
      
      // File: node_modules\openzeppelin-solidity\contracts\token\ERC20\IERC20.sol
      
      pragma solidity ^0.5.0;
      
      /**
       * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
       * the optional functions; to access them see {ERC20Detailed}.
       */
      interface IERC20 {
          /**
           * @dev Returns the amount of tokens in existence.
           */
          function totalSupply() external view returns (uint256);
      
          /**
           * @dev Returns the amount of tokens owned by `account`.
           */
          function balanceOf(address account) external view returns (uint256);
      
          /**
           * @dev Moves `amount` tokens from the caller's account to `recipient`.
           *
           * Returns a boolean value indicating whether the operation succeeded.
           *
           * Emits a {Transfer} event.
           */
          function transfer(address recipient, uint256 amount) external returns (bool);
      
          /**
           * @dev Returns the remaining number of tokens that `spender` will be
           * allowed to spend on behalf of `owner` through {transferFrom}. This is
           * zero by default.
           *
           * This value changes when {approve} or {transferFrom} are called.
           */
          function allowance(address owner, address spender) external view returns (uint256);
      
          /**
           * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
           *
           * Returns a boolean value indicating whether the operation succeeded.
           *
           * IMPORTANT: 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
           *
           * Emits an {Approval} event.
           */
          function approve(address spender, uint256 amount) external returns (bool);
      
          /**
           * @dev Moves `amount` tokens from `sender` to `recipient` using the
           * allowance mechanism. `amount` is then deducted from the caller's
           * allowance.
           *
           * Returns a boolean value indicating whether the operation succeeded.
           *
           * Emits a {Transfer} event.
           */
          function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
      
          /**
           * @dev Emitted when `value` tokens are moved from one account (`from`) to
           * another (`to`).
           *
           * Note that `value` may be zero.
           */
          event Transfer(address indexed from, address indexed to, uint256 value);
      
          /**
           * @dev Emitted when the allowance of a `spender` for an `owner` is set by
           * a call to {approve}. `value` is the new allowance.
           */
          event Approval(address indexed owner, address indexed spender, uint256 value);
      }
      
      // File: node_modules\openzeppelin-solidity\contracts\math\SafeMath.sol
      
      pragma solidity ^0.5.0;
      
      /**
       * @dev Wrappers over Solidity's arithmetic operations with added overflow
       * checks.
       *
       * Arithmetic operations in Solidity wrap on overflow. This can easily result
       * in bugs, because programmers usually assume that an overflow raises an
       * error, which is the standard behavior in high level programming languages.
       * `SafeMath` restores this intuition by reverting the transaction when an
       * operation overflows.
       *
       * Using this library instead of the unchecked operations eliminates an entire
       * class of bugs, so it's recommended to use it always.
       */
      library SafeMath {
          /**
           * @dev Returns the addition of two unsigned integers, reverting on
           * overflow.
           *
           * Counterpart to Solidity's `+` operator.
           *
           * Requirements:
           * - Addition cannot overflow.
           */
          function add(uint256 a, uint256 b) internal pure returns (uint256) {
              uint256 c = a + b;
              require(c >= a, "SafeMath: addition overflow");
      
              return c;
          }
      
          /**
           * @dev Returns the subtraction of two unsigned integers, reverting on
           * overflow (when the result is negative).
           *
           * Counterpart to Solidity's `-` operator.
           *
           * Requirements:
           * - Subtraction cannot overflow.
           */
          function sub(uint256 a, uint256 b) internal pure returns (uint256) {
              return sub(a, b, "SafeMath: subtraction overflow");
          }
      
          /**
           * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
           * overflow (when the result is negative).
           *
           * Counterpart to Solidity's `-` operator.
           *
           * Requirements:
           * - Subtraction cannot overflow.
           *
           * _Available since v2.4.0._
           */
          function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
              require(b <= a, errorMessage);
              uint256 c = a - b;
      
              return c;
          }
      
          /**
           * @dev Returns the multiplication of two unsigned integers, reverting on
           * overflow.
           *
           * Counterpart to Solidity's `*` operator.
           *
           * Requirements:
           * - Multiplication cannot overflow.
           */
          function mul(uint256 a, uint256 b) internal pure returns (uint256) {
              // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
              // benefit is lost if 'b' is also tested.
              // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
              if (a == 0) {
                  return 0;
              }
      
              uint256 c = a * b;
              require(c / a == b, "SafeMath: multiplication overflow");
      
              return c;
          }
      
          /**
           * @dev Returns the integer division of two unsigned integers. Reverts on
           * division by zero. The result is rounded towards zero.
           *
           * Counterpart to Solidity's `/` operator. Note: this function uses a
           * `revert` opcode (which leaves remaining gas untouched) while Solidity
           * uses an invalid opcode to revert (consuming all remaining gas).
           *
           * Requirements:
           * - The divisor cannot be zero.
           */
          function div(uint256 a, uint256 b) internal pure returns (uint256) {
              return div(a, b, "SafeMath: division by zero");
          }
      
          /**
           * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
           * division by zero. The result is rounded towards zero.
           *
           * Counterpart to Solidity's `/` operator. Note: this function uses a
           * `revert` opcode (which leaves remaining gas untouched) while Solidity
           * uses an invalid opcode to revert (consuming all remaining gas).
           *
           * Requirements:
           * - The divisor cannot be zero.
           *
           * _Available since v2.4.0._
           */
          function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
              // Solidity only automatically asserts when dividing by 0
              require(b > 0, errorMessage);
              uint256 c = a / b;
              // assert(a == b * c + a % b); // There is no case in which this doesn't hold
      
              return c;
          }
      
          /**
           * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
           * Reverts when dividing by zero.
           *
           * Counterpart to Solidity's `%` operator. This function uses a `revert`
           * opcode (which leaves remaining gas untouched) while Solidity uses an
           * invalid opcode to revert (consuming all remaining gas).
           *
           * Requirements:
           * - The divisor cannot be zero.
           */
          function mod(uint256 a, uint256 b) internal pure returns (uint256) {
              return mod(a, b, "SafeMath: modulo by zero");
          }
      
          /**
           * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
           * Reverts with custom message when dividing by zero.
           *
           * Counterpart to Solidity's `%` operator. This function uses a `revert`
           * opcode (which leaves remaining gas untouched) while Solidity uses an
           * invalid opcode to revert (consuming all remaining gas).
           *
           * Requirements:
           * - The divisor cannot be zero.
           *
           * _Available since v2.4.0._
           */
          function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
              require(b != 0, errorMessage);
              return a % b;
          }
      }
      
      // File: node_modules\openzeppelin-solidity\contracts\token\ERC20\ERC20.sol
      
      pragma solidity ^0.5.0;
      
      
      
      
      /**
       * @dev Implementation of the {IERC20} interface.
       *
       * This implementation is agnostic to the way tokens are created. This means
       * that a supply mechanism has to be added in a derived contract using {_mint}.
       * For a generic mechanism see {ERC20Mintable}.
       *
       * TIP: For a detailed writeup see our guide
       * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
       * to implement supply mechanisms].
       *
       * We have followed general OpenZeppelin guidelines: functions revert instead
       * of returning `false` on failure. This behavior is nonetheless conventional
       * and does not conflict with the expectations of ERC20 applications.
       *
       * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
       * This allows applications to reconstruct the allowance for all accounts just
       * by listening to said events. Other implementations of the EIP may not emit
       * these events, as it isn't required by the specification.
       *
       * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
       * functions have been added to mitigate the well-known issues around setting
       * allowances. See {IERC20-approve}.
       */
      contract ERC20 is Context, IERC20 {
          using SafeMath for uint256;
      
          mapping (address => uint256) private _balances;
      
          mapping (address => mapping (address => uint256)) private _allowances;
      
          uint256 private _totalSupply;
      
          /**
           * @dev See {IERC20-totalSupply}.
           */
          function totalSupply() public view returns (uint256) {
              return _totalSupply;
          }
      
          /**
           * @dev See {IERC20-balanceOf}.
           */
          function balanceOf(address account) public view returns (uint256) {
              return _balances[account];
          }
      
          /**
           * @dev See {IERC20-transfer}.
           *
           * Requirements:
           *
           * - `recipient` cannot be the zero address.
           * - the caller must have a balance of at least `amount`.
           */
          function transfer(address recipient, uint256 amount) public returns (bool) {
              _transfer(_msgSender(), recipient, amount);
              return true;
          }
      
          /**
           * @dev See {IERC20-allowance}.
           */
          function allowance(address owner, address spender) public view returns (uint256) {
              return _allowances[owner][spender];
          }
      
          /**
           * @dev See {IERC20-approve}.
           *
           * Requirements:
           *
           * - `spender` cannot be the zero address.
           */
          function approve(address spender, uint256 amount) public returns (bool) {
              _approve(_msgSender(), spender, amount);
              return true;
          }
      
          /**
           * @dev See {IERC20-transferFrom}.
           *
           * Emits an {Approval} event indicating the updated allowance. This is not
           * required by the EIP. See the note at the beginning of {ERC20};
           *
           * Requirements:
           * - `sender` and `recipient` cannot be the zero address.
           * - `sender` must have a balance of at least `amount`.
           * - the caller must have allowance for `sender`'s tokens of at least
           * `amount`.
           */
          function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
              _transfer(sender, recipient, amount);
              _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
              return true;
          }
      
          /**
           * @dev Atomically increases the allowance granted to `spender` by the caller.
           *
           * This is an alternative to {approve} that can be used as a mitigation for
           * problems described in {IERC20-approve}.
           *
           * Emits an {Approval} event indicating the updated allowance.
           *
           * Requirements:
           *
           * - `spender` cannot be the zero address.
           */
          function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
              _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
              return true;
          }
      
          /**
           * @dev Atomically decreases the allowance granted to `spender` by the caller.
           *
           * This is an alternative to {approve} that can be used as a mitigation for
           * problems described in {IERC20-approve}.
           *
           * Emits an {Approval} event indicating the updated allowance.
           *
           * Requirements:
           *
           * - `spender` cannot be the zero address.
           * - `spender` must have allowance for the caller of at least
           * `subtractedValue`.
           */
          function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
              _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
              return true;
          }
      
          /**
           * @dev Moves tokens `amount` from `sender` to `recipient`.
           *
           * This is internal function is equivalent to {transfer}, and can be used to
           * e.g. implement automatic token fees, slashing mechanisms, etc.
           *
           * Emits a {Transfer} event.
           *
           * Requirements:
           *
           * - `sender` cannot be the zero address.
           * - `recipient` cannot be the zero address.
           * - `sender` must have a balance of at least `amount`.
           */
          function _transfer(address sender, address recipient, uint256 amount) internal {
              require(sender != address(0), "ERC20: transfer from the zero address");
              require(recipient != address(0), "ERC20: transfer to the zero address");
      
              _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
              _balances[recipient] = _balances[recipient].add(amount);
              emit Transfer(sender, recipient, amount);
          }
      
          /** @dev Creates `amount` tokens and assigns them to `account`, increasing
           * the total supply.
           *
           * Emits a {Transfer} event with `from` set to the zero address.
           *
           * Requirements
           *
           * - `to` cannot be the zero address.
           */
          function _mint(address account, uint256 amount) internal {
              require(account != address(0), "ERC20: mint to the zero address");
      
              _totalSupply = _totalSupply.add(amount);
              _balances[account] = _balances[account].add(amount);
              emit Transfer(address(0), account, amount);
          }
      
           /**
           * @dev Destroys `amount` tokens from `account`, reducing the
           * total supply.
           *
           * Emits a {Transfer} event with `to` set to the zero address.
           *
           * Requirements
           *
           * - `account` cannot be the zero address.
           * - `account` must have at least `amount` tokens.
           */
          function _burn(address account, uint256 amount) internal {
              require(account != address(0), "ERC20: burn from the zero address");
      
              _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
              _totalSupply = _totalSupply.sub(amount);
              emit Transfer(account, address(0), amount);
          }
      
          /**
           * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
           *
           * This is internal function is equivalent to `approve`, and can be used to
           * e.g. set automatic allowances for certain subsystems, etc.
           *
           * Emits an {Approval} event.
           *
           * Requirements:
           *
           * - `owner` cannot be the zero address.
           * - `spender` cannot be the zero address.
           */
          function _approve(address owner, address spender, uint256 amount) internal {
              require(owner != address(0), "ERC20: approve from the zero address");
              require(spender != address(0), "ERC20: approve to the zero address");
      
              _allowances[owner][spender] = amount;
              emit Approval(owner, spender, amount);
          }
      
          /**
           * @dev Destroys `amount` tokens from `account`.`amount` is then deducted
           * from the caller's allowance.
           *
           * See {_burn} and {_approve}.
           */
          function _burnFrom(address account, uint256 amount) internal {
              _burn(account, amount);
              _approve(account, _msgSender(), _allowances[account][_msgSender()].sub(amount, "ERC20: burn amount exceeds allowance"));
          }
      }
      
      // File: node_modules\openzeppelin-solidity\contracts\token\ERC20\ERC20Detailed.sol
      
      pragma solidity ^0.5.0;
      
      
      /**
       * @dev Optional functions from the ERC20 standard.
       */
      contract ERC20Detailed is IERC20 {
          string private _name;
          string private _symbol;
          uint8 private _decimals;
      
          /**
           * @dev Sets the values for `name`, `symbol`, and `decimals`. All three of
           * these values are immutable: they can only be set once during
           * construction.
           */
          constructor (string memory name, string memory symbol, uint8 decimals) public {
              _name = name;
              _symbol = symbol;
              _decimals = decimals;
          }
      
          /**
           * @dev Returns the name of the token.
           */
          function name() public view returns (string memory) {
              return _name;
          }
      
          /**
           * @dev Returns the symbol of the token, usually a shorter version of the
           * name.
           */
          function symbol() public view returns (string memory) {
              return _symbol;
          }
      
          /**
           * @dev Returns the number of decimals used to get its user representation.
           * For example, if `decimals` equals `2`, a balance of `505` tokens should
           * be displayed to a user as `5,05` (`505 / 10 ** 2`).
           *
           * Tokens usually opt for a value of 18, imitating the relationship between
           * Ether and Wei.
           *
           * NOTE: This information is only used for _display_ purposes: it in
           * no way affects any of the arithmetic of the contract, including
           * {IERC20-balanceOf} and {IERC20-transfer}.
           */
          function decimals() public view returns (uint8) {
              return _decimals;
          }
      }
      
      // File: contracts\Token.sol
      
      pragma solidity ^0.5.0;
      
      
      
      
      contract Token is ERC20, ERC20Detailed, Ownable {
      
      	/**
      	 * Initial supply of the currency
      	 */
      	uint256 public constant INITIAL_SUPPLY = (10 ** 8) * (10 ** 18);
      
      	/**
      	 * Constructor that gives msg.sender all of the existing tokens
      	 */
      	constructor () public ERC20Detailed("AdHash Token", "AD", 18) {
      		_mint(msg.sender, INITIAL_SUPPLY);
      	}
      }