{"content":{"title":"如何使用Create2工厂创建合约并验证（Base Remix）?","body":"0x0000000000FFe8B47B3e2130213B802212439497 ：[Create2 Factory](https://goerli.etherscan.io/address/0x0000000000ffe8b47b3e2130213b802212439497)\r\n\r\n## 1. safeCreate2\r\n\r\n```solidity\r\n// initializationCode =  creationCode + abi.encode(constructor.parameter)\r\nfunction safeCreate2(\r\n    bytes32 salt,\r\n    bytes calldata initializationCode\r\n  ) external payable containsCaller(salt) returns (address deploymentAddress) {}\r\n```\r\n\r\n \r\n\r\n## 2. Demo contract\r\n\r\n```solidity\r\n// SPDX-License-Identifier: MIT\r\npragma solidity ^0.8.0;\r\n\r\nimport \"@openzeppelin/contracts/token/ERC20/ERC20.sol\";\r\nimport \"@openzeppelin/contracts/security/Pausable.sol\";\r\nimport \"@openzeppelin/contracts/access/Ownable.sol\";\r\n\r\ncontract CNYT is ERC20, Pausable, Ownable {\r\n    constructor() ERC20(\"CNYT\", \"CNYT\") {\r\n        _mint(tx.origin, 100000000 * 10**decimals());\r\n        _transferOwnership(tx.origin);\r\n    }\r\n\r\n    function pause() public onlyOwner {\r\n        _pause();\r\n    }\r\n\r\n    function unpause() public onlyOwner {\r\n        _unpause();\r\n    }\r\n\r\n    function mint(address to, uint256 amount) public onlyOwner {\r\n        _mint(to, amount);\r\n    }\r\n\r\n    function _beforeTokenTransfer(\r\n        address from,\r\n        address to,\r\n        uint256 amount\r\n    ) internal override whenNotPaused {\r\n        super._beforeTokenTransfer(from, to, amount);\r\n    }\r\n\r\n    function decimals() public view virtual override returns (uint8) {\r\n        return 6;\r\n    }\r\n}\r\n```\r\n\r\n\r\n![image.png](https://img.learnblockchain.cn/attachments/2023/06/1l9cp74T649004f8bac56.png)\r\n\r\nBytecode: `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3. 使用ethers.js 暴力计算 合约地址\r\n\r\n```javascript\r\nconst { ethers, utils } = require(\"ethers\");\r\n\r\nmain();\r\n\r\nfunction main() {\r\n\r\n\r\n  let from = \"0x0000000000ffe8b47b3e2130213b802212439497\";\r\n  let salt =\r\n    \"0x0000000000000000000000000000000000000000000000000000000000000001\";\r\n\r\n  let initCode =\r\n    \"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   \r\n  let initCodeHash = utils.keccak256(initCode);\r\n\r\n  var isValid = false;\r\n  const regex = /^0x0000.*$/; // 表达式\r\n  // 166168 0x0000000000000000000000000000000000000000000000000000000000028919 0x000013A1d7c63D56C8a5d58c93D1fb977cB409c5\r\n  // 364256 0x0000000000000000000000000000000000000000000000000000000000058ee2 0x000003dec64147218c901161B82325c40BACe25C\r\n\r\n  let index = 166168;\r\n  while (!isValid) {\r\n    \r\n    console.log(index);\r\n    let salt = ethers.utils.hexZeroPad(ethers.utils.hexlify(index), 32);\r\n\r\n    let address = getAddressCreate2(from, salt, initCodeHash);\r\n\r\n    isValid = regex.test(address);\r\n    if (isValid) {\r\n      console.log(\"Create2:\" + salt + \" \" + address);\r\n      return;\r\n    }\r\n      \r\n\tindex++;\r\n  }\r\n\r\n}\r\n\r\nfunction getAddressCreate2(from, salt, initCodeHash) {\r\n  let address = ethers.utils.getCreate2Address(from, salt, initCodeHash);\r\n  //   console.log(\"Create2:\" + salt + \" \" + address);\r\n  return address;\r\n}\r\n\r\n```\r\n\r\nsalt:  `0x0000000000000000000000000000000000000000000000000000000000028919`\r\n\r\n预先计算的合约地址：`0x000013A1d7c63D56C8a5d58c93D1fb977cB409c5`\r\n\r\n## 4. 调用Create2 Factory合约\r\n\r\nTransaction Hash: https://goerli.etherscan.io/tx/0xf0f442c3022e1001a080bf72747239dcf822c705bcb8c13cf6aa0505e97085e4\r\n\r\n## 5. `etherscan`验证合约（Standard-Json-Input）\r\n\r\n验证地址：https://goerli.etherscan.io/verifyContract\r\n\r\n#### 如何获取 Standard-Json-Input？\r\n\r\n`json`路径：contracts/artifacts/build-info/4f94fb575ff59e02f4.json\r\n\r\n`input`字段的内容。\r\n\r\n\r\n\r\n![image.png](https://img.learnblockchain.cn/attachments/2023/06/ApGwVaiM6490051bd9989.png)\r\n\r\n#### CNYT.json\r\n\r\n```json\r\n{\r\n    \"language\": \"Solidity\",\r\n    \"sources\":\r\n    {\r\n        \"contracts/CNYT.sol\":\r\n        {\r\n            \"content\": \"// SPDX-License-Identifier: MIT\\npragma solidity ^0.8.0;\\n\\nimport \\\"@openzeppelin/contracts/token/ERC20/ERC20.sol\\\";\\nimport \\\"@openzeppelin/contracts/security/Pausable.sol\\\";\\nimport \\\"@openzeppelin/contracts/access/Ownable.sol\\\";\\n\\ncontract CNYT is ERC20, Pausable, Ownable {\\n    constructor() ERC20(\\\"CNYT\\\", \\\"CNYT\\\") {\\n        _mint(tx.origin, 100000000 * 10**decimals());\\n        _transferOwnership(tx.origin);\\n    }\\n\\n    function pause() public onlyOwner {\\n        _pause();\\n    }\\n\\n    function unpause() public onlyOwner {\\n        _unpause();\\n    }\\n\\n    function mint(address to, uint256 amount) public onlyOwner {\\n        _mint(to, amount);\\n    }\\n\\n    function _beforeTokenTransfer(\\n        address from,\\n        address to,\\n        uint256 amount\\n    ) internal override whenNotPaused {\\n        super._beforeTokenTransfer(from, to, amount);\\n    }\\n\\n    function decimals() public view virtual override returns (uint8) {\\n        return 6;\\n    }\\n}\\n\"\r\n        },\r\n        \"@openzeppelin/contracts/access/Ownable.sol\":\r\n        {\r\n            \"content\": \"// SPDX-License-Identifier: MIT\\n// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)\\n\\npragma solidity ^0.8.0;\\n\\nimport \\\"../utils/Context.sol\\\";\\n\\n/**\\n * @dev Contract module which provides a basic access control mechanism, where\\n * there is an account (an owner) that can be granted exclusive access to\\n * specific functions.\\n *\\n * By default, the owner account will be the one that deploys the contract. This\\n * can later be changed with {transferOwnership}.\\n *\\n * This module is used through inheritance. It will make available the modifier\\n * `onlyOwner`, which can be applied to your functions to restrict their use to\\n * the owner.\\n */\\nabstract contract Ownable is Context {\\n    address private _owner;\\n\\n    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);\\n\\n    /**\\n     * @dev Initializes the contract setting the deployer as the initial owner.\\n     */\\n    constructor() {\\n        _transferOwnership(_msgSender());\\n    }\\n\\n    /**\\n     * @dev Throws if called by any account other than the owner.\\n     */\\n    modifier onlyOwner() {\\n        _checkOwner();\\n        _;\\n    }\\n\\n    /**\\n     * @dev Returns the address of the current owner.\\n     */\\n    function owner() public view virtual returns (address) {\\n        return _owner;\\n    }\\n\\n    /**\\n     * @dev Throws if the sender is not the owner.\\n     */\\n    function _checkOwner() internal view virtual {\\n        require(owner() == _msgSender(), \\\"Ownable: caller is not the owner\\\");\\n    }\\n\\n    /**\\n     * @dev Leaves the contract without owner. It will not be possible to call\\n     * `onlyOwner` functions anymore. Can only be called by the current owner.\\n     *\\n     * NOTE: Renouncing ownership will leave the contract without an owner,\\n     * thereby removing any functionality that is only available to the owner.\\n     */\\n    function renounceOwnership() public virtual onlyOwner {\\n        _transferOwnership(address(0));\\n    }\\n\\n    /**\\n     * @dev Transfers ownership of the contract to a new account (`newOwner`).\\n     * Can only be called by the current owner.\\n     */\\n    function transferOwnership(address newOwner) public virtual onlyOwner {\\n        require(newOwner != address(0), \\\"Ownable: new owner is the zero address\\\");\\n        _transferOwnership(newOwner);\\n    }\\n\\n    /**\\n     * @dev Transfers ownership of the contract to a new account (`newOwner`).\\n     * Internal function without access restriction.\\n     */\\n    function _transferOwnership(address newOwner) internal virtual {\\n        address oldOwner = _owner;\\n        _owner = newOwner;\\n        emit OwnershipTransferred(oldOwner, newOwner);\\n    }\\n}\\n\"\r\n        },\r\n        \"@openzeppelin/contracts/security/Pausable.sol\":\r\n        {\r\n            \"content\": \"// SPDX-License-Identifier: MIT\\n// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)\\n\\npragma solidity ^0.8.0;\\n\\nimport \\\"../utils/Context.sol\\\";\\n\\n/**\\n * @dev Contract module which allows children to implement an emergency stop\\n * mechanism that can be triggered by an authorized account.\\n *\\n * This module is used through inheritance. It will make available the\\n * modifiers `whenNotPaused` and `whenPaused`, which can be applied to\\n * the functions of your contract. Note that they will not be pausable by\\n * simply including this module, only once the modifiers are put in place.\\n */\\nabstract contract Pausable is Context {\\n    /**\\n     * @dev Emitted when the pause is triggered by `account`.\\n     */\\n    event Paused(address account);\\n\\n    /**\\n     * @dev Emitted when the pause is lifted by `account`.\\n     */\\n    event Unpaused(address account);\\n\\n    bool private _paused;\\n\\n    /**\\n     * @dev Initializes the contract in unpaused state.\\n     */\\n    constructor() {\\n        _paused = false;\\n    }\\n\\n    /**\\n     * @dev Modifier to make a function callable only when the contract is not paused.\\n     *\\n     * Requirements:\\n     *\\n     * - The contract must not be paused.\\n     */\\n    modifier whenNotPaused() {\\n        _requireNotPaused();\\n        _;\\n    }\\n\\n    /**\\n     * @dev Modifier to make a function callable only when the contract is paused.\\n     *\\n     * Requirements:\\n     *\\n     * - The contract must be paused.\\n     */\\n    modifier whenPaused() {\\n        _requirePaused();\\n        _;\\n    }\\n\\n    /**\\n     * @dev Returns true if the contract is paused, and false otherwise.\\n     */\\n    function paused() public view virtual returns (bool) {\\n        return _paused;\\n    }\\n\\n    /**\\n     * @dev Throws if the contract is paused.\\n     */\\n    function _requireNotPaused() internal view virtual {\\n        require(!paused(), \\\"Pausable: paused\\\");\\n    }\\n\\n    /**\\n     * @dev Throws if the contract is not paused.\\n     */\\n    function _requirePaused() internal view virtual {\\n        require(paused(), \\\"Pausable: not paused\\\");\\n    }\\n\\n    /**\\n     * @dev Triggers stopped state.\\n     *\\n     * Requirements:\\n     *\\n     * - The contract must not be paused.\\n     */\\n    function _pause() internal virtual whenNotPaused {\\n        _paused = true;\\n        emit Paused(_msgSender());\\n    }\\n\\n    /**\\n     * @dev Returns to normal state.\\n     *\\n     * Requirements:\\n     *\\n     * - The contract must be paused.\\n     */\\n    function _unpause() internal virtual whenPaused {\\n        _paused = false;\\n        emit Unpaused(_msgSender());\\n    }\\n}\\n\"\r\n        },\r\n        \"@openzeppelin/contracts/token/ERC20/ERC20.sol\":\r\n        {\r\n            \"content\": \"// SPDX-License-Identifier: MIT\\n// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/ERC20.sol)\\n\\npragma solidity ^0.8.0;\\n\\nimport \\\"./IERC20.sol\\\";\\nimport \\\"./extensions/IERC20Metadata.sol\\\";\\nimport \\\"../../utils/Context.sol\\\";\\n\\n/**\\n * @dev Implementation of the {IERC20} interface.\\n *\\n * This implementation is agnostic to the way tokens are created. This means\\n * that a supply mechanism has to be added in a derived contract using {_mint}.\\n * For a generic mechanism see {ERC20PresetMinterPauser}.\\n *\\n * TIP: For a detailed writeup see our guide\\n * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How\\n * to implement supply mechanisms].\\n *\\n * We have followed general OpenZeppelin Contracts guidelines: functions revert\\n * instead returning `false` on failure. This behavior is nonetheless\\n * conventional and does not conflict with the expectations of ERC20\\n * applications.\\n *\\n * Additionally, an {Approval} event is emitted on calls to {transferFrom}.\\n * This allows applications to reconstruct the allowance for all accounts just\\n * by listening to said events. Other implementations of the EIP may not emit\\n * these events, as it isn't required by the specification.\\n *\\n * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}\\n * functions have been added to mitigate the well-known issues around setting\\n * allowances. See {IERC20-approve}.\\n */\\ncontract ERC20 is Context, IERC20, IERC20Metadata {\\n    mapping(address => uint256) private _balances;\\n\\n    mapping(address => mapping(address => uint256)) private _allowances;\\n\\n    uint256 private _totalSupply;\\n\\n    string private _name;\\n    string private _symbol;\\n\\n    /**\\n     * @dev Sets the values for {name} and {symbol}.\\n     *\\n     * The default value of {decimals} is 18. To select a different value for\\n     * {decimals} you should overload it.\\n     *\\n     * All two of these values are immutable: they can only be set once during\\n     * construction.\\n     */\\n    constructor(string memory name_, string memory symbol_) {\\n        _name = name_;\\n        _symbol = symbol_;\\n    }\\n\\n    /**\\n     * @dev Returns the name of the token.\\n     */\\n    function name() public view virtual override returns (string memory) {\\n        return _name;\\n    }\\n\\n    /**\\n     * @dev Returns the symbol of the token, usually a shorter version of the\\n     * name.\\n     */\\n    function symbol() public view virtual override returns (string memory) {\\n        return _symbol;\\n    }\\n\\n    /**\\n     * @dev Returns the number of decimals used to get its user representation.\\n     * For example, if `decimals` equals `2`, a balance of `505` tokens should\\n     * be displayed to a user as `5.05` (`505 / 10 ** 2`).\\n     *\\n     * Tokens usually opt for a value of 18, imitating the relationship between\\n     * Ether and Wei. This is the value {ERC20} uses, unless this function is\\n     * overridden;\\n     *\\n     * NOTE: This information is only used for _display_ purposes: it in\\n     * no way affects any of the arithmetic of the contract, including\\n     * {IERC20-balanceOf} and {IERC20-transfer}.\\n     */\\n    function decimals() public view virtual override returns (uint8) {\\n        return 18;\\n    }\\n\\n    /**\\n     * @dev See {IERC20-totalSupply}.\\n     */\\n    function totalSupply() public view virtual override returns (uint256) {\\n        return _totalSupply;\\n    }\\n\\n    /**\\n     * @dev See {IERC20-balanceOf}.\\n     */\\n    function balanceOf(address account) public view virtual override returns (uint256) {\\n        return _balances[account];\\n    }\\n\\n    /**\\n     * @dev See {IERC20-transfer}.\\n     *\\n     * Requirements:\\n     *\\n     * - `to` cannot be the zero address.\\n     * - the caller must have a balance of at least `amount`.\\n     */\\n    function transfer(address to, uint256 amount) public virtual override returns (bool) {\\n        address owner = _msgSender();\\n        _transfer(owner, to, amount);\\n        return true;\\n    }\\n\\n    /**\\n     * @dev See {IERC20-allowance}.\\n     */\\n    function allowance(address owner, address spender) public view virtual override returns (uint256) {\\n        return _allowances[owner][spender];\\n    }\\n\\n    /**\\n     * @dev See {IERC20-approve}.\\n     *\\n     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on\\n     * `transferFrom`. This is semantically equivalent to an infinite approval.\\n     *\\n     * Requirements:\\n     *\\n     * - `spender` cannot be the zero address.\\n     */\\n    function approve(address spender, uint256 amount) public virtual override returns (bool) {\\n        address owner = _msgSender();\\n        _approve(owner, spender, amount);\\n        return true;\\n    }\\n\\n    /**\\n     * @dev See {IERC20-transferFrom}.\\n     *\\n     * Emits an {Approval} event indicating the updated allowance. This is not\\n     * required by the EIP. See the note at the beginning of {ERC20}.\\n     *\\n     * NOTE: Does not update the allowance if the current allowance\\n     * is the maximum `uint256`.\\n     *\\n     * Requirements:\\n     *\\n     * - `from` and `to` cannot be the zero address.\\n     * - `from` must have a balance of at least `amount`.\\n     * - the caller must have allowance for ``from``'s tokens of at least\\n     * `amount`.\\n     */\\n    function transferFrom(\\n        address from,\\n        address to,\\n        uint256 amount\\n    ) public virtual override returns (bool) {\\n        address spender = _msgSender();\\n        _spendAllowance(from, spender, amount);\\n        _transfer(from, to, amount);\\n        return true;\\n    }\\n\\n    /**\\n     * @dev Atomically increases the allowance granted to `spender` by the caller.\\n     *\\n     * This is an alternative to {approve} that can be used as a mitigation for\\n     * problems described in {IERC20-approve}.\\n     *\\n     * Emits an {Approval} event indicating the updated allowance.\\n     *\\n     * Requirements:\\n     *\\n     * - `spender` cannot be the zero address.\\n     */\\n    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {\\n        address owner = _msgSender();\\n        _approve(owner, spender, allowance(owner, spender) + addedValue);\\n        return true;\\n    }\\n\\n    /**\\n     * @dev Atomically decreases the allowance granted to `spender` by the caller.\\n     *\\n     * This is an alternative to {approve} that can be used as a mitigation for\\n     * problems described in {IERC20-approve}.\\n     *\\n     * Emits an {Approval} event indicating the updated allowance.\\n     *\\n     * Requirements:\\n     *\\n     * - `spender` cannot be the zero address.\\n     * - `spender` must have allowance for the caller of at least\\n     * `subtractedValue`.\\n     */\\n    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {\\n        address owner = _msgSender();\\n        uint256 currentAllowance = allowance(owner, spender);\\n        require(currentAllowance >= subtractedValue, \\\"ERC20: decreased allowance below zero\\\");\\n        unchecked {\\n            _approve(owner, spender, currentAllowance - subtractedValue);\\n        }\\n\\n        return true;\\n    }\\n\\n    /**\\n     * @dev Moves `amount` of tokens from `from` to `to`.\\n     *\\n     * This internal function is equivalent to {transfer}, and can be used to\\n     * e.g. implement automatic token fees, slashing mechanisms, etc.\\n     *\\n     * Emits a {Transfer} event.\\n     *\\n     * Requirements:\\n     *\\n     * - `from` cannot be the zero address.\\n     * - `to` cannot be the zero address.\\n     * - `from` must have a balance of at least `amount`.\\n     */\\n    function _transfer(\\n        address from,\\n        address to,\\n        uint256 amount\\n    ) internal virtual {\\n        require(from != address(0), \\\"ERC20: transfer from the zero address\\\");\\n        require(to != address(0), \\\"ERC20: transfer to the zero address\\\");\\n\\n        _beforeTokenTransfer(from, to, amount);\\n\\n        uint256 fromBalance = _balances[from];\\n        require(fromBalance >= amount, \\\"ERC20: transfer amount exceeds balance\\\");\\n        unchecked {\\n            _balances[from] = fromBalance - amount;\\n            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by\\n            // decrementing then incrementing.\\n            _balances[to] += amount;\\n        }\\n\\n        emit Transfer(from, to, amount);\\n\\n        _afterTokenTransfer(from, to, amount);\\n    }\\n\\n    /** @dev Creates `amount` tokens and assigns them to `account`, increasing\\n     * the total supply.\\n     *\\n     * Emits a {Transfer} event with `from` set to the zero address.\\n     *\\n     * Requirements:\\n     *\\n     * - `account` cannot be the zero address.\\n     */\\n    function _mint(address account, uint256 amount) internal virtual {\\n        require(account != address(0), \\\"ERC20: mint to the zero address\\\");\\n\\n        _beforeTokenTransfer(address(0), account, amount);\\n\\n        _totalSupply += amount;\\n        unchecked {\\n            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.\\n            _balances[account] += amount;\\n        }\\n        emit Transfer(address(0), account, amount);\\n\\n        _afterTokenTransfer(address(0), account, amount);\\n    }\\n\\n    /**\\n     * @dev Destroys `amount` tokens from `account`, reducing the\\n     * total supply.\\n     *\\n     * Emits a {Transfer} event with `to` set to the zero address.\\n     *\\n     * Requirements:\\n     *\\n     * - `account` cannot be the zero address.\\n     * - `account` must have at least `amount` tokens.\\n     */\\n    function _burn(address account, uint256 amount) internal virtual {\\n        require(account != address(0), \\\"ERC20: burn from the zero address\\\");\\n\\n        _beforeTokenTransfer(account, address(0), amount);\\n\\n        uint256 accountBalance = _balances[account];\\n        require(accountBalance >= amount, \\\"ERC20: burn amount exceeds balance\\\");\\n        unchecked {\\n            _balances[account] = accountBalance - amount;\\n            // Overflow not possible: amount <= accountBalance <= totalSupply.\\n            _totalSupply -= amount;\\n        }\\n\\n        emit Transfer(account, address(0), amount);\\n\\n        _afterTokenTransfer(account, address(0), amount);\\n    }\\n\\n    /**\\n     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.\\n     *\\n     * This internal function is equivalent to `approve`, and can be used to\\n     * e.g. set automatic allowances for certain subsystems, etc.\\n     *\\n     * Emits an {Approval} event.\\n     *\\n     * Requirements:\\n     *\\n     * - `owner` cannot be the zero address.\\n     * - `spender` cannot be the zero address.\\n     */\\n    function _approve(\\n        address owner,\\n        address spender,\\n        uint256 amount\\n    ) internal virtual {\\n        require(owner != address(0), \\\"ERC20: approve from the zero address\\\");\\n        require(spender != address(0), \\\"ERC20: approve to the zero address\\\");\\n\\n        _allowances[owner][spender] = amount;\\n        emit Approval(owner, spender, amount);\\n    }\\n\\n    /**\\n     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.\\n     *\\n     * Does not update the allowance amount in case of infinite allowance.\\n     * Revert if not enough allowance is available.\\n     *\\n     * Might emit an {Approval} event.\\n     */\\n    function _spendAllowance(\\n        address owner,\\n        address spender,\\n        uint256 amount\\n    ) internal virtual {\\n        uint256 currentAllowance = allowance(owner, spender);\\n        if (currentAllowance != type(uint256).max) {\\n            require(currentAllowance >= amount, \\\"ERC20: insufficient allowance\\\");\\n            unchecked {\\n                _approve(owner, spender, currentAllowance - amount);\\n            }\\n        }\\n    }\\n\\n    /**\\n     * @dev Hook that is called before any transfer of tokens. This includes\\n     * minting and burning.\\n     *\\n     * Calling conditions:\\n     *\\n     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens\\n     * will be transferred to `to`.\\n     * - when `from` is zero, `amount` tokens will be minted for `to`.\\n     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.\\n     * - `from` and `to` are never both zero.\\n     *\\n     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\\n     */\\n    function _beforeTokenTransfer(\\n        address from,\\n        address to,\\n        uint256 amount\\n    ) internal virtual {}\\n\\n    /**\\n     * @dev Hook that is called after any transfer of tokens. This includes\\n     * minting and burning.\\n     *\\n     * Calling conditions:\\n     *\\n     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens\\n     * has been transferred to `to`.\\n     * - when `from` is zero, `amount` tokens have been minted for `to`.\\n     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.\\n     * - `from` and `to` are never both zero.\\n     *\\n     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\\n     */\\n    function _afterTokenTransfer(\\n        address from,\\n        address to,\\n        uint256 amount\\n    ) internal virtual {}\\n}\\n\"\r\n        },\r\n        \"@openzeppelin/contracts/utils/Context.sol\":\r\n        {\r\n            \"content\": \"// SPDX-License-Identifier: MIT\\n// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)\\n\\npragma solidity ^0.8.0;\\n\\n/**\\n * @dev Provides information about the current execution context, including the\\n * sender of the transaction and its data. While these are generally available\\n * via msg.sender and msg.data, they should not be accessed in such a direct\\n * manner, since when dealing with meta-transactions the account sending and\\n * paying for execution may not be the actual sender (as far as an application\\n * is concerned).\\n *\\n * This contract is only required for intermediate, library-like contracts.\\n */\\nabstract contract Context {\\n    function _msgSender() internal view virtual returns (address) {\\n        return msg.sender;\\n    }\\n\\n    function _msgData() internal view virtual returns (bytes calldata) {\\n        return msg.data;\\n    }\\n}\\n\"\r\n        },\r\n        \"@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol\":\r\n        {\r\n            \"content\": \"// SPDX-License-Identifier: MIT\\n// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)\\n\\npragma solidity ^0.8.0;\\n\\nimport \\\"../IERC20.sol\\\";\\n\\n/**\\n * @dev Interface for the optional metadata functions from the ERC20 standard.\\n *\\n * _Available since v4.1._\\n */\\ninterface IERC20Metadata is IERC20 {\\n    /**\\n     * @dev Returns the name of the token.\\n     */\\n    function name() external view returns (string memory);\\n\\n    /**\\n     * @dev Returns the symbol of the token.\\n     */\\n    function symbol() external view returns (string memory);\\n\\n    /**\\n     * @dev Returns the decimals places of the token.\\n     */\\n    function decimals() external view returns (uint8);\\n}\\n\"\r\n        },\r\n        \"@openzeppelin/contracts/token/ERC20/IERC20.sol\":\r\n        {\r\n            \"content\": \"// SPDX-License-Identifier: MIT\\n// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)\\n\\npragma solidity ^0.8.0;\\n\\n/**\\n * @dev Interface of the ERC20 standard as defined in the EIP.\\n */\\ninterface IERC20 {\\n    /**\\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\\n     * another (`to`).\\n     *\\n     * Note that `value` may be zero.\\n     */\\n    event Transfer(address indexed from, address indexed to, uint256 value);\\n\\n    /**\\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\\n     * a call to {approve}. `value` is the new allowance.\\n     */\\n    event Approval(address indexed owner, address indexed spender, uint256 value);\\n\\n    /**\\n     * @dev Returns the amount of tokens in existence.\\n     */\\n    function totalSupply() external view returns (uint256);\\n\\n    /**\\n     * @dev Returns the amount of tokens owned by `account`.\\n     */\\n    function balanceOf(address account) external view returns (uint256);\\n\\n    /**\\n     * @dev Moves `amount` tokens from the caller's account to `to`.\\n     *\\n     * Returns a boolean value indicating whether the operation succeeded.\\n     *\\n     * Emits a {Transfer} event.\\n     */\\n    function transfer(address to, uint256 amount) external returns (bool);\\n\\n    /**\\n     * @dev Returns the remaining number of tokens that `spender` will be\\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\\n     * zero by default.\\n     *\\n     * This value changes when {approve} or {transferFrom} are called.\\n     */\\n    function allowance(address owner, address spender) external view returns (uint256);\\n\\n    /**\\n     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\\n     *\\n     * Returns a boolean value indicating whether the operation succeeded.\\n     *\\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\\n     * that someone may use both the old and the new allowance by unfortunate\\n     * transaction ordering. One possible solution to mitigate this race\\n     * condition is to first reduce the spender's allowance to 0 and set the\\n     * desired value afterwards:\\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\\n     *\\n     * Emits an {Approval} event.\\n     */\\n    function approve(address spender, uint256 amount) external returns (bool);\\n\\n    /**\\n     * @dev Moves `amount` tokens from `from` to `to` using the\\n     * allowance mechanism. `amount` is then deducted from the caller's\\n     * allowance.\\n     *\\n     * Returns a boolean value indicating whether the operation succeeded.\\n     *\\n     * Emits a {Transfer} event.\\n     */\\n    function transferFrom(\\n        address from,\\n        address to,\\n        uint256 amount\\n    ) external returns (bool);\\n}\\n\"\r\n        }\r\n    },\r\n    \"settings\":\r\n    {\r\n        \"optimizer\":\r\n        {\r\n            \"enabled\": true,\r\n            \"runs\": 200\r\n        },\r\n        \"outputSelection\":\r\n        {\r\n            \"*\":\r\n            {\r\n                \"\":\r\n                [\r\n                    \"ast\"\r\n                ],\r\n                \"*\":\r\n                [\r\n                    \"abi\",\r\n                    \"metadata\",\r\n                    \"devdoc\",\r\n                    \"userdoc\",\r\n                    \"storageLayout\",\r\n                    \"evm.legacyAssembly\",\r\n                    \"evm.bytecode\",\r\n                    \"evm.deployedBytecode\",\r\n                    \"evm.methodIdentifiers\",\r\n                    \"evm.gasEstimates\",\r\n                    \"evm.assembly\"\r\n                ]\r\n            }\r\n        }\r\n    }\r\n}\r\n```"},"author":{"user":"https://learnblockchain.cn/people/5578","address":"0x0148ff91E06977093992EDdEf76F381E1EE5de2f"},"history":"QmP9RUPCjAGt1QKGfo6D8BVwSBKoPxa2t8Vuxv2kti4ZY3","timestamp":1687161779,"version":1}