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Latest 6 from a total of 6 transactions
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Transfer | 13825110 | 1083 days ago | IN | 0 ETH | 0.0022937 | ||||
Approve | 12712725 | 1257 days ago | IN | 0 ETH | 0.00046563 | ||||
Approve | 12712674 | 1257 days ago | IN | 0 ETH | 0.00046563 | ||||
Transfer | 12712343 | 1257 days ago | IN | 0 ETH | 0.00024168 | ||||
Transfer | 12711672 | 1257 days ago | IN | 0 ETH | 0.00061952 | ||||
Approve | 12711427 | 1257 days ago | IN | 0 ETH | 0.00066585 |
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Contract Name:
HelloERC20
Compiler Version
v0.8.5+commit.a4f2e591
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2021-06-26 */ // SPDX-License-Identifier: MIT /* * Token has been generated for FREE using https://vittominacori.github.io/erc20-generator/ * * NOTE: "Contract Source Code Verified (Similar Match)" means that this Token is similar to other tokens deployed * using the same generator. It is not an issue. It means that you won't need to verify your source code because of * it is already verified. * * DISCLAIMER: GENERATOR'S AUTHOR IS FREE OF ANY LIABILITY REGARDING THE TOKEN AND THE USE THAT IS MADE OF IT. * The following code is provided under MIT License. Anyone can use it as per their needs. * The generator's purpose is to make people able to tokenize their ideas without coding or paying for it. * Source code is well tested and continuously updated to reduce risk of bugs and to introduce language optimizations. * Anyway the purchase of tokens involves a high degree of risk. Before acquiring tokens, it is recommended to * carefully weighs all the information and risks detailed in Token owner's Conditions. */ // File: @openzeppelin/contracts/token/ERC20/IERC20.sol pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ 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: @openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol pragma solidity ^0.8.0; /** * @dev Interface for the optional metadata functions from the ERC20 standard. * * _Available since v4.1._ */ interface IERC20Metadata is IERC20 { /** * @dev Returns the name of the token. */ function name() external view returns (string memory); /** * @dev Returns the symbol of the token. */ function symbol() external view returns (string memory); /** * @dev Returns the decimals places of the token. */ function decimals() external view returns (uint8); } // File: @openzeppelin/contracts/utils/Context.sol pragma solidity ^0.8.0; /* * @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 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. */ abstract contract Context { function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } } // File: @openzeppelin/contracts/token/ERC20/ERC20.sol pragma solidity ^0.8.0; /** * @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 {ERC20PresetMinterPauser}. * * 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, IERC20Metadata { mapping (address => uint256) private _balances; mapping (address => mapping (address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; /** * @dev Sets the values for {name} and {symbol}. * * The defaut value of {decimals} is 18. To select a different value for * {decimals} you should overload it. * * All two of these values are immutable: they can only be set once during * construction. */ constructor (string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev Returns the name of the token. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view virtual override 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. This is the value {ERC20} uses, unless this function is * overridden; * * 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 virtual override returns (uint8) { return 18; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view virtual override 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 virtual override returns (bool) { _transfer(_msgSender(), recipient, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override 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 virtual override returns (bool) { _transfer(sender, recipient, amount); uint256 currentAllowance = _allowances[sender][_msgSender()]; require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance"); _approve(sender, _msgSender(), currentAllowance - 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 virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + 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 virtual returns (bool) { uint256 currentAllowance = _allowances[_msgSender()][spender]; require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); _approve(_msgSender(), spender, currentAllowance - 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 virtual { require(sender != address(0), "ERC20: transfer from the zero address"); require(recipient != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(sender, recipient, amount); uint256 senderBalance = _balances[sender]; require(senderBalance >= amount, "ERC20: transfer amount exceeds balance"); _balances[sender] = senderBalance - amount; _balances[recipient] += 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 virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply += amount; _balances[account] += 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 virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); uint256 accountBalance = _balances[account]; require(accountBalance >= amount, "ERC20: burn amount exceeds balance"); _balances[account] = accountBalance - amount; _totalSupply -= amount; emit Transfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. * * This 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 virtual { 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 Hook that is called before any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * will be to transferred to `to`. * - when `from` is zero, `amount` tokens will be minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { } } // File: contracts/service/ServicePayer.sol pragma solidity ^0.8.0; interface IPayable { function pay(string memory serviceName) external payable; } /** * @title ServicePayer * @dev Implementation of the ServicePayer */ abstract contract ServicePayer { constructor(address payable receiver, string memory serviceName) payable { IPayable(receiver).pay{value: msg.value}(serviceName); } } // File: contracts/utils/GeneratorCopyright.sol pragma solidity ^0.8.0; /** * @title GeneratorCopyright * @dev Implementation of the GeneratorCopyright */ contract GeneratorCopyright { string private constant _GENERATOR = "https://vittominacori.github.io/erc20-generator"; string private _version; constructor(string memory version_) { _version = version_; } /** * @dev Returns the token generator tool. */ function generator() public pure returns (string memory) { return _GENERATOR; } /** * @dev Returns the token generator version. */ function version() public view returns (string memory) { return _version; } } // File: contracts/token/ERC20/HelloERC20.sol pragma solidity ^0.8.0; /** * @title HelloERC20 * @author ERC20 Generator (https://vittominacori.github.io/erc20-generator) * @dev Implementation of the HelloERC20 */ contract HelloERC20 is ERC20, ServicePayer, GeneratorCopyright("v5.1.0") { constructor( string memory name_, string memory symbol_, address payable feeReceiver_ ) payable ERC20(name_, symbol_) ServicePayer(feeReceiver_, "HelloERC20") { _mint(_msgSender(), 10000e18); } }
Contract Security Audit
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Contract Creation Code
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Deployed Bytecode
0x608060405234801561001057600080fd5b50600436106100cf5760003560e01c806354fd4d501161008c57806395d89b411161006657806395d89b4114610195578063a457c2d71461019d578063a9059cbb146101b0578063dd62ed3e146101c357600080fd5b806354fd4d501461015c57806370a08231146101645780637afa1eed1461018d57600080fd5b806306fdde03146100d4578063095ea7b3146100f257806318160ddd1461011557806323b872dd14610127578063313ce5671461013a5780633950935114610149575b600080fd5b6100dc6101fc565b6040516100e9919061084a565b60405180910390f35b610105610100366004610820565b61028e565b60405190151581526020016100e9565b6002545b6040519081526020016100e9565b6101056101353660046107e4565b6102a4565b604051601281526020016100e9565b610105610157366004610820565b61035a565b6100dc610391565b61011961017236600461078f565b6001600160a01b031660009081526020819052604090205490565b6100dc6103a0565b6100dc6103c0565b6101056101ab366004610820565b6103cf565b6101056101be366004610820565b61046a565b6101196101d13660046107b1565b6001600160a01b03918216600090815260016020908152604080832093909416825291909152205490565b60606003805461020b906108ce565b80601f0160208091040260200160405190810160405280929190818152602001828054610237906108ce565b80156102845780601f1061025957610100808354040283529160200191610284565b820191906000526020600020905b81548152906001019060200180831161026757829003601f168201915b5050505050905090565b600061029b338484610477565b50600192915050565b60006102b184848461059b565b6001600160a01b03841660009081526001602090815260408083203384529091529020548281101561033b5760405162461bcd60e51b815260206004820152602860248201527f45524332303a207472616e7366657220616d6f756e74206578636565647320616044820152676c6c6f77616e636560c01b60648201526084015b60405180910390fd5b61034f853361034a86856108b7565b610477565b506001949350505050565b3360008181526001602090815260408083206001600160a01b0387168452909152812054909161029b91859061034a90869061089f565b60606005805461020b906108ce565b60606040518060600160405280602f8152602001610920602f9139905090565b60606004805461020b906108ce565b3360009081526001602090815260408083206001600160a01b0386168452909152812054828110156104515760405162461bcd60e51b815260206004820152602560248201527f45524332303a2064656372656173656420616c6c6f77616e63652062656c6f77604482015264207a65726f60d81b6064820152608401610332565b610460338561034a86856108b7565b5060019392505050565b600061029b33848461059b565b6001600160a01b0383166104d95760405162461bcd60e51b8152602060048201526024808201527f45524332303a20617070726f76652066726f6d20746865207a65726f206164646044820152637265737360e01b6064820152608401610332565b6001600160a01b03821661053a5760405162461bcd60e51b815260206004820152602260248201527f45524332303a20617070726f766520746f20746865207a65726f206164647265604482015261737360f01b6064820152608401610332565b6001600160a01b0383811660008181526001602090815260408083209487168084529482529182902085905590518481527f8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925910160405180910390a3505050565b6001600160a01b0383166105ff5760405162461bcd60e51b815260206004820152602560248201527f45524332303a207472616e736665722066726f6d20746865207a65726f206164604482015264647265737360d81b6064820152608401610332565b6001600160a01b0382166106615760405162461bcd60e51b815260206004820152602360248201527f45524332303a207472616e7366657220746f20746865207a65726f206164647260448201526265737360e81b6064820152608401610332565b6001600160a01b038316600090815260208190526040902054818110156106d95760405162461bcd60e51b815260206004820152602660248201527f45524332303a207472616e7366657220616d6f756e7420657863656564732062604482015265616c616e636560d01b6064820152608401610332565b6106e382826108b7565b6001600160a01b03808616600090815260208190526040808220939093559085168152908120805484929061071990849061089f565b92505081905550826001600160a01b0316846001600160a01b03167fddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef8460405161076591815260200190565b60405180910390a350505050565b80356001600160a01b038116811461078a57600080fd5b919050565b6000602082840312156107a157600080fd5b6107aa82610773565b9392505050565b600080604083850312156107c457600080fd5b6107cd83610773565b91506107db60208401610773565b90509250929050565b6000806000606084860312156107f957600080fd5b61080284610773565b925061081060208501610773565b9150604084013590509250925092565b6000806040838503121561083357600080fd5b61083c83610773565b946020939093013593505050565b600060208083528351808285015260005b818110156108775785810183015185820160400152820161085b565b81811115610889576000604083870101525b50601f01601f1916929092016040019392505050565b600082198211156108b2576108b2610909565b500190565b6000828210156108c9576108c9610909565b500390565b600181811c908216806108e257607f821691505b6020821081141561090357634e487b7160e01b600052602260045260246000fd5b50919050565b634e487b7160e01b600052601160045260246000fdfe68747470733a2f2f766974746f6d696e61636f72692e6769746875622e696f2f65726332302d67656e657261746f72a2646970667358221220185c29d084d2185dbff6d17cde8a634e85ba271fa57d814bb34819b8af56542664736f6c63430008050033
Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a0000000000000000000000000997cd2e739fa7ce2bbec0d18181430bc23effa970000000000000000000000000000000000000000000000000000000000000006476f436f696e00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003474f430000000000000000000000000000000000000000000000000000000000
-----Decoded View---------------
Arg [0] : name_ (string): GoCoin
Arg [1] : symbol_ (string): GOC
Arg [2] : feeReceiver_ (address): 0x997Cd2e739fa7cE2bbeC0d18181430BC23Effa97
-----Encoded View---------------
7 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000060
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [2] : 000000000000000000000000997cd2e739fa7ce2bbec0d18181430bc23effa97
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000006
Arg [4] : 476f436f696e0000000000000000000000000000000000000000000000000000
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000003
Arg [6] : 474f430000000000000000000000000000000000000000000000000000000000
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Multichain Portfolio | 30 Chains
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.