Transaction Hash:
Block:
9811028 at Apr-05-2020 08:42:17 AM +UTC
Transaction Fee:
0.000103838 ETH
$0.19
Gas Used:
51,919 Gas / 2 Gwei
Emitted Events:
85 |
ERC20Token.Transfer( from=[Sender] 0xf8efab076dcc500771895884a0cc82c8539920a3, to=0xDa007AF9d4C5135bbF9F5A6aCF46863Bb5C3467E, value=37100 )
|
Account State Difference:
Address | Before | After | State Difference | ||
---|---|---|---|---|---|
0x12DC7677...d85841172 | |||||
0x5A0b54D5...D3E029c4c
Miner
| (Spark Pool) | 47.756240725639468598 Eth | 47.756344563639468598 Eth | 0.000103838 | |
0xf8EfAB07...8539920a3 |
0.3919992219 Eth
Nonce: 1871
|
0.3918953839 Eth
Nonce: 1872
| 0.000103838 |
Execution Trace
ERC20Token.transfer( to=0xDa007AF9d4C5135bbF9F5A6aCF46863Bb5C3467E, value=37100 ) => ( True )
transfer[ERC20 (ln:297)]
_transfer[ERC20 (ln:298)]
sub[ERC20 (ln:393)]
add[ERC20 (ln:394)]
Transfer[ERC20 (ln:395)]
pragma solidity ^0.5.8; // File: openzeppelin-solidity/contracts/token/ERC20/IERC20.sol /** * @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. * * > 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: openzeppelin-solidity/contracts/token/ERC20/ERC20Detailed.sol /** * @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 that 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: openzeppelin-solidity/contracts/math/SafeMath.sol /** * @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) { require(b <= a, "SafeMath: subtraction overflow"); 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-solidity/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) { // Solidity only automatically asserts when dividing by 0 require(b > 0, "SafeMath: division by zero"); 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) { require(b != 0, "SafeMath: modulo by zero"); return a % b; } } // File: openzeppelin-solidity/contracts/token/ERC20/ERC20.sol /** * @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`. * * *For a detailed writeup see our guide [How to implement supply * mechanisms](https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226).* * * 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 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(msg.sender, 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 value) public returns (bool) { _approve(msg.sender, spender, value); 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 `value`. * - 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, msg.sender, _allowances[sender][msg.sender].sub(amount)); 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(msg.sender, spender, _allowances[msg.sender][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(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue)); 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); _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 Destoys `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 value) internal { require(account != address(0), "ERC20: burn from the zero address"); _totalSupply = _totalSupply.sub(value); _balances[account] = _balances[account].sub(value); emit Transfer(account, address(0), value); } /** * @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 value) internal { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = value; emit Approval(owner, spender, value); } /** * @dev Destoys `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, msg.sender, _allowances[account][msg.sender].sub(amount)); } } // File: openzeppelin-solidity/contracts/access/Roles.sol /** * @title Roles * @dev Library for managing addresses assigned to a Role. */ library Roles { struct Role { mapping (address => bool) bearer; } /** * @dev Give an account access to this role. */ function add(Role storage role, address account) internal { require(!has(role, account), "Roles: account already has role"); role.bearer[account] = true; } /** * @dev Remove an account's access to this role. */ function remove(Role storage role, address account) internal { require(has(role, account), "Roles: account does not have role"); role.bearer[account] = false; } /** * @dev Check if an account has this role. * @return bool */ function has(Role storage role, address account) internal view returns (bool) { require(account != address(0), "Roles: account is the zero address"); return role.bearer[account]; } } // File: openzeppelin-solidity/contracts/access/roles/MinterRole.sol contract MinterRole { using Roles for Roles.Role; event MinterAdded(address indexed account); event MinterRemoved(address indexed account); Roles.Role private _minters; constructor () internal { _addMinter(msg.sender); } modifier onlyMinter() { require(isMinter(msg.sender), "MinterRole: caller does not have the Minter role"); _; } function isMinter(address account) public view returns (bool) { return _minters.has(account); } function addMinter(address account) public onlyMinter { _addMinter(account); } function renounceMinter() public { _removeMinter(msg.sender); } function _addMinter(address account) internal { _minters.add(account); emit MinterAdded(account); } function _removeMinter(address account) internal { _minters.remove(account); emit MinterRemoved(account); } } // File: openzeppelin-solidity/contracts/token/ERC20/ERC20Mintable.sol /** * @dev Extension of `ERC20` that adds a set of accounts with the `MinterRole`, * which have permission to mint (create) new tokens as they see fit. * * At construction, the deployer of the contract is the only minter. */ contract ERC20Mintable is ERC20, MinterRole { /** * @dev See `ERC20._mint`. * * Requirements: * * - the caller must have the `MinterRole`. */ function mint(address account, uint256 amount) public onlyMinter returns (bool) { _mint(account, amount); return true; } } // File: openzeppelin-solidity/contracts/token/ERC20/ERC20Capped.sol /** * @dev Extension of `ERC20Mintable` that adds a cap to the supply of tokens. */ contract ERC20Capped is ERC20Mintable { uint256 private _cap; /** * @dev Sets the value of the `cap`. This value is immutable, it can only be * set once during construction. */ constructor (uint256 cap) public { require(cap > 0, "ERC20Capped: cap is 0"); _cap = cap; } /** * @dev Returns the cap on the token's total supply. */ function cap() public view returns (uint256) { return _cap; } /** * @dev See `ERC20Mintable.mint`. * * Requirements: * * - `value` must not cause the total supply to go over the cap. */ function _mint(address account, uint256 value) internal { require(totalSupply().add(value) <= _cap, "ERC20Capped: cap exceeded"); super._mint(account, value); } } // File: openzeppelin-solidity/contracts/token/ERC20/ERC20Burnable.sol /** * @dev Extension of `ERC20` that allows token holders to destroy both their own * tokens and those that they have an allowance for, in a way that can be * recognized off-chain (via event analysis). */ contract ERC20Burnable is ERC20 { /** * @dev Destoys `amount` tokens from the caller. * * See `ERC20._burn`. */ function burn(uint256 amount) public { _burn(msg.sender, amount); } /** * @dev See `ERC20._burnFrom`. */ function burnFrom(address account, uint256 amount) public { _burnFrom(account, amount); } } // File: openzeppelin-solidity/contracts/ownership/Ownable.sol /** * @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 aplied to your functions to restrict their use to * the owner. */ contract Ownable { 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 = msg.sender; 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 msg.sender == _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: eth-token-recover/contracts/TokenRecover.sol /** * @title TokenRecover * @author Vittorio Minacori (https://github.com/vittominacori) * @dev Allow to recover any ERC20 sent into the contract for error */ contract TokenRecover is Ownable { /** * @dev Remember that only owner can call so be careful when use on contracts generated from other contracts. * @param tokenAddress The token contract address * @param tokenAmount Number of tokens to be sent */ function recoverERC20(address tokenAddress, uint256 tokenAmount) public onlyOwner { IERC20(tokenAddress).transfer(owner(), tokenAmount); } } // File: ico-maker/contracts/access/roles/OperatorRole.sol contract OperatorRole { using Roles for Roles.Role; event OperatorAdded(address indexed account); event OperatorRemoved(address indexed account); Roles.Role private _operators; constructor() internal { _addOperator(msg.sender); } modifier onlyOperator() { require(isOperator(msg.sender)); _; } function isOperator(address account) public view returns (bool) { return _operators.has(account); } function addOperator(address account) public onlyOperator { _addOperator(account); } function renounceOperator() public { _removeOperator(msg.sender); } function _addOperator(address account) internal { _operators.add(account); emit OperatorAdded(account); } function _removeOperator(address account) internal { _operators.remove(account); emit OperatorRemoved(account); } } // File: ico-maker/contracts/token/ERC20/BaseERC20Token.sol /** * @title BaseERC20Token * @author Vittorio Minacori (https://github.com/vittominacori) * @dev Implementation of the BaseERC20Token */ contract BaseERC20Token is ERC20Detailed, ERC20Capped, ERC20Burnable, OperatorRole, TokenRecover { event MintFinished(); event TransferEnabled(); // indicates if minting is finished bool private _mintingFinished = false; // indicates if transfer is enabled bool private _transferEnabled = false; /** * @dev Tokens can be minted only before minting finished. */ modifier canMint() { require(!_mintingFinished); _; } /** * @dev Tokens can be moved only after if transfer enabled or if you are an approved operator. */ modifier canTransfer(address from) { require(_transferEnabled || isOperator(from)); _; } /** * @param name Name of the token * @param symbol A symbol to be used as ticker * @param decimals Number of decimals. All the operations are done using the smallest and indivisible token unit * @param cap Maximum number of tokens mintable * @param initialSupply Initial token supply */ constructor( string memory name, string memory symbol, uint8 decimals, uint256 cap, uint256 initialSupply ) public ERC20Detailed(name, symbol, decimals) ERC20Capped(cap) { if (initialSupply > 0) { _mint(owner(), initialSupply); } } /** * @return if minting is finished or not. */ function mintingFinished() public view returns (bool) { return _mintingFinished; } /** * @return if transfer is enabled or not. */ function transferEnabled() public view returns (bool) { return _transferEnabled; } /** * @dev Function to mint tokens * @param to The address that will receive the minted tokens. * @param value The amount of tokens to mint. * @return A boolean that indicates if the operation was successful. */ function mint(address to, uint256 value) public canMint returns (bool) { return super.mint(to, value); } /** * @dev Transfer token to a specified address * @param to The address to transfer to. * @param value The amount to be transferred. * @return A boolean that indicates if the operation was successful. */ function transfer(address to, uint256 value) public canTransfer(msg.sender) returns (bool) { return super.transfer(to, value); } /** * @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 * @return A boolean that indicates if the operation was successful. */ function transferFrom(address from, address to, uint256 value) public canTransfer(from) returns (bool) { return super.transferFrom(from, to, value); } /** * @dev Function to stop minting new tokens and enable transfer. */ function finishMinting() public onlyOwner canMint { _mintingFinished = true; emit MintFinished(); } /** * @dev Function to enable transfers. */ function enableTransfer() public onlyOwner { _transferEnabled = true; emit TransferEnabled(); } /** * @dev remove the `operator` role from address * @param account Address you want to remove role */ function removeOperator(address account) public onlyOwner { _removeOperator(account); } /** * @dev remove the `minter` role from address * @param account Address you want to remove role */ function removeMinter(address account) public onlyOwner { _removeMinter(account); } } // File: contracts/ERC20Token.sol /** * @title ERC20Token * @author Vittorio Minacori (https://github.com/vittominacori) * @dev Implementation of a BaseERC20Token */ contract ERC20Token is BaseERC20Token { string public builtOn = "https://vittominacori.github.io/erc20-generator"; constructor( string memory name, string memory symbol, uint8 decimals, uint256 cap, uint256 initialSupply ) public BaseERC20Token(name, symbol, decimals, cap, initialSupply) {} // solhint-disable-line no-empty-blocks }