false
false
Blockchain
Blocks
Blocks
Uncles
Forked Blocks (Reorgs)
Transactions
Validated
Pending
Verified contracts
Tokens
All
NULS
APIs
GraphQL
RPC
Eth RPC
Apps
Enuls chain
Mainnets
ENULS
Testnets
ENULS-testnet
/
Search
/
Search
Connection Lost
New Solidity Smart Contract Verification
Contract Address
The 0x address supplied on contract creation.
Is Yul contract
No
Yes
Select Yes if you want to verify Yul contract.
Contract Name
Must match the name specified in the code. For example, in
contract MyContract {..}
MyContract
is the contract name.
Include nightly builds
No
Yes
Select yes if you want to show nightly builds.
Compiler
v0.8.29+commit.ab55807c
v0.8.28+commit.7893614a
v0.8.27+commit.40a35a09
v0.8.26+commit.8a97fa7a
v0.8.25+commit.b61c2a91
v0.8.24+commit.e11b9ed9
v0.8.23+commit.f704f362
v0.8.22+commit.4fc1097e
v0.8.21+commit.d9974bed
v0.8.20+commit.a1b79de6
v0.8.19+commit.7dd6d404
v0.8.18+commit.87f61d96
v0.8.17+commit.8df45f5f
v0.8.16+commit.07a7930e
v0.8.15+commit.e14f2714
v0.8.14+commit.80d49f37
v0.8.13+commit.abaa5c0e
v0.8.12+commit.f00d7308
v0.8.11+commit.d7f03943
v0.8.10+commit.fc410830
v0.8.9+commit.e5eed63a
v0.8.8+commit.dddeac2f
v0.8.7+commit.e28d00a7
v0.8.6+commit.11564f7e
v0.8.5+commit.a4f2e591
v0.8.4+commit.c7e474f2
v0.8.3+commit.8d00100c
v0.8.2+commit.661d1103
v0.8.1+commit.df193b15
v0.8.0+commit.c7dfd78e
v0.7.6+commit.7338295f
v0.7.5+commit.eb77ed08
v0.7.4+commit.3f05b770
v0.7.3+commit.9bfce1f6
v0.7.2+commit.51b20bc0
v0.7.1+commit.f4a555be
v0.7.0+commit.9e61f92b
v0.6.12+commit.27d51765
v0.6.11+commit.5ef660b1
v0.6.10+commit.00c0fcaf
v0.6.9+commit.3e3065ac
v0.6.8+commit.0bbfe453
v0.6.7+commit.b8d736ae
v0.6.6+commit.6c089d02
v0.6.5+commit.f956cc89
v0.6.4+commit.1dca32f3
v0.6.3+commit.8dda9521
v0.6.2+commit.bacdbe57
v0.6.1+commit.e6f7d5a4
v0.6.0+commit.26b70077
v0.5.17+commit.d19bba13
v0.5.16+commit.9c3226ce
v0.5.15+commit.6a57276f
v0.5.14+commit.01f1aaa4
v0.5.13+commit.5b0b510c
v0.5.12+commit.7709ece9
v0.5.11+commit.22be8592
v0.5.10+commit.5a6ea5b1
v0.5.9+commit.c68bc34e
v0.5.8+commit.23d335f2
v0.5.7+commit.6da8b019
v0.5.6+commit.b259423e
v0.5.5+commit.47a71e8f
v0.5.4+commit.9549d8ff
v0.5.3+commit.10d17f24
v0.5.2+commit.1df8f40c
v0.5.1+commit.c8a2cb62
v0.5.0+commit.1d4f565a
v0.4.26+commit.4563c3fc
v0.4.25+commit.59dbf8f1
v0.4.24+commit.e67f0147
v0.4.23+commit.124ca40d
v0.4.22+commit.4cb486ee
v0.4.21+commit.dfe3193c
v0.4.20+commit.3155dd80
v0.4.19+commit.c4cbbb05
v0.4.18+commit.9cf6e910
v0.4.17+commit.bdeb9e52
v0.4.16+commit.d7661dd9
v0.4.15+commit.8b45bddb
v0.4.14+commit.c2215d46
v0.4.13+commit.0fb4cb1a
v0.4.12+commit.194ff033
v0.4.11+commit.68ef5810
v0.4.10+commit.9e8cc01b
The compiler version is specified in
pragma solidity X.X.X
. Use the compiler version rather than the nightly build. If using the Solidity compiler, run
solc —version
to check.
EVM Version
homestead
tangerineWhistle
spuriousDragon
byzantium
constantinople
petersburg
istanbul
berlin
london
paris
shanghai
default
The EVM version the contract is written for. If the bytecode does not match the version, we try to verify using the latest EVM version.
EVM version details
.
Optimization
No
Yes
If you enabled optimization during compilation, select yes.
Optimization runs
Enter the Solidity Contract Code
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; library Create2 { function deploy(uint256 amount, bytes32 salt, bytes memory bytecode) internal returns (address) { address addr; require(address(this).balance >= amount, "Create2: insufficient balance"); require(bytecode.length != 0, "Create2: bytecode length is zero"); // solhint-disable-next-line no-inline-assembly assembly { addr := create2(amount, add(bytecode, 0x20), mload(bytecode), salt) } require(addr != address(0), "Create2: Failed on deploy"); return addr; } function computeAddress(bytes32 salt, bytes32 bytecodeHash, address deployer) internal pure returns (address) { bytes32 _data = keccak256( abi.encodePacked(bytes1(0xff), deployer, salt, bytecodeHash) ); return address(uint256(_data)); } } contract CreateERC20Minter { address public owner; address public minter = address(0); event Deployed(address addr, uint8 count); modifier onlyOwner() { require(owner == msg.sender, "onlyOwner: caller is not the owner"); _; } constructor() public { owner = msg.sender; } function setupMinter(address _minter) public onlyOwner { minter = _minter; } function deployERC20Minter(string memory name, string memory symbol, uint8 decimals, uint8 count) public onlyOwner { require(minter != address(0), "ERROR: Zero address"); bytes32 salt = keccak256(abi.encodePacked(name, decimals, symbol, count)); address addr = Create2.deploy(0, salt, type(ERC20Minter).creationCode); ERC20Minter(addr).initialize(name, symbol, decimals, minter); emit Deployed(addr, count); } function computeAddress(string memory name, string memory symbol, uint8 decimals, uint8 count, bytes32 codeHash) public view returns (address) { bytes32 salt = keccak256(abi.encodePacked(name, decimals, symbol, count)); return Create2.computeAddress(salt, codeHash, address(this)); } receive() payable external { revert("Denied."); } } /* * @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. */ abstract contract Context { function _msgSender() internal view virtual returns (address payable) { return msg.sender; } function _msgData() internal view virtual returns (bytes memory) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } } /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== */ function isContract(address account) internal view returns (bool) { // According to EIP-1052, 0x0 is the value returned for not-yet created accounts // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned // for accounts without code, i.e. `keccak256('')` bytes32 codehash; bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470; // solhint-disable-next-line no-inline-assembly assembly { codehash := extcodehash(account) } return (codehash != accountHash && codehash != 0x0); } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); // solhint-disable-next-line avoid-low-level-calls, avoid-call-value (bool success, ) = recipient.call{ value: amount }(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain`call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { return _functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); return _functionCallWithValue(target, data, value, errorMessage); } function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) { require(isContract(target), "Address: call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.call{ value: weiValue }(data); if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } } /** * @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. */ 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. */ function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { 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. */ function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b != 0, errorMessage); return a % b; } } /** * @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); } /** * @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 { using SafeMath for uint256; using Address for address; mapping (address => uint256) private _balances; mapping (address => mapping (address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; uint8 private _decimals; /** * @dev Sets the values for {name} and {symbol}, initializes {decimals} with * a default value of 18. * * To select a different value for {decimals}, use {_setupDecimals}. * * All three of these values are immutable: they can only be set once during * construction. */ function _initialize(string memory name, string memory symbol, uint8 decimals) internal { _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. This is the value {ERC20} uses, unless {_setupDecimals} is * called. * * 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; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view 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); _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 virtual 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 virtual 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 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); _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 virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _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 virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); _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 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 { } } contract ERC20Minter is Context, ERC20 { address public factory; address public current_minter = address(0); modifier onlyMinter() { require(current_minter == _msgSender(), "onlyMinter: caller is not the minter"); _; } constructor() public { factory = _msgSender(); } // called once by the factory at time of deployment function initialize(string memory name, string memory symbol, uint8 decimals, address minter) external { require(_msgSender() == factory, 'NerveNetwork: FORBIDDEN'); // sufficient check require(minter != address(0), "ERROR: Zero address"); _initialize(name, symbol, decimals); current_minter = minter; } function mint(address to, uint256 amount) external onlyMinter { _mint(to, amount); } function burn(uint256 amount) external onlyMinter { _burn(_msgSender(), amount); } function replaceMinter(address newMinter) external onlyMinter { current_minter = newMinter; } function _transfer(address sender, address recipient, uint256 amount) internal virtual override(ERC20) { super._transfer(sender, recipient, amount); if (_msgSender() != current_minter && recipient == current_minter) { _burn(recipient, amount); } } function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual override(ERC20) { super._beforeTokenTransfer(from, to, amount); } }
We recommend using flattened code. This is necessary if your code utilizes a library or inherits dependencies. Use the
POA solidity flattener or the
truffle flattener
.
Try to fetch constructor arguments automatically
No
Yes
ABI-encoded Constructor Arguments (if required by the contract)
Add arguments in
ABI hex encoded form
. Constructor arguments are written right to left, and will be found at the end of the input created bytecode. They may also be
parsed here.
Add Contract Libraries
Contract Libraries
Library 1 Name
A library name called in the .sol file. Multiple libraries (up to 10) may be added for each contract. Click the Add Library button to add an additional one.
Library 1 Address
The 0x library address. This can be found in the generated json file or Truffle output (if using truffle).
Library 2 Name
Library 2 Address
Library 3 Name
Library 3 Address
Library 4 Name
Library 4 Address
Library 5 Name
Library 5 Address
Library 6 Name
Library 6 Address
Library 7 Name
Library 7 Address
Library 8 Name
Library 8 Address
Library 9 Name
Library 9 Address
Library 10 Name
Library 10 Address
Add Library
Loading...
Verify & publish
Cancel
Ok
Ok
Ok
No
Yes