如何使用Create2工厂创建合约并验证(Base Remix)?

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所属分类:币安BSC
摘要

使用Create2工厂(0x0000000000ffe8b47b3e2130213b802212439497)创建合约并在etherscan验证


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如何使用Create2工厂创建合约并验证(Base Remix)?

0x0000000000FFe8B47B3e2130213B802212439497 :Create2 Factory

1. safeCreate2

// initializationCode =  creationCode + abi.encode(constructor.parameter)
function safeCreate2(
    bytes32 salt,
    bytes calldata initializationCode
  ) external payable containsCaller(salt) returns (address deploymentAddress) {}

2. Demo contract

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract CNYT is ERC20, Pausable, Ownable {
    constructor() ERC20("CNYT", "CNYT") {
        _mint(tx.origin, 100000000 * 10**decimals());
        _transferOwnership(tx.origin);
    }

    function pause() public onlyOwner {
        _pause();
    }

    function unpause() public onlyOwner {
        _unpause();
    }

    function mint(address to, uint256 amount) public onlyOwner {
        _mint(to, amount);
    }

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal override whenNotPaused {
        super._beforeTokenTransfer(from, to, amount);
    }

    function decimals() public view virtual override returns (uint8) {
        return 6;
    }
}

如何使用Create2工厂创建合约并验证(Base Remix)?

Bytecode:

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3. 使用ethers.js 暴力计算 合约地址

const { ethers, utils } = require("ethers");

main();

function main() {


  let from = "0x0000000000ffe8b47b3e2130213b802212439497";
  let salt =
    "0x0000000000000000000000000000000000000000000000000000000000000001";

  let initCode =
    "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   
  let initCodeHash = utils.keccak256(initCode);

  var isValid = false;
  const regex = /^0x0000.*$/; // 表达式
  // 166168 0x0000000000000000000000000000000000000000000000000000000000028919 0x000013A1d7c63D56C8a5d58c93D1fb977cB409c5
  // 364256 0x0000000000000000000000000000000000000000000000000000000000058ee2 0x000003dec64147218c901161B82325c40BACe25C

  let index = 166168;
  while (!isValid) {
    
    console.log(index);
    let salt = ethers.utils.hexZeroPad(ethers.utils.hexlify(index), 32);

    let address = getAddressCreate2(from, salt, initCodeHash);

    isValid = regex.test(address);
    if (isValid) {
      console.log("Create2:" + salt + " " + address);
      return;
    }
      
	index++;
  }

}

function getAddressCreate2(from, salt, initCodeHash) {
  let address = ethers.utils.getCreate2Address(from, salt, initCodeHash);
  //   console.log("Create2:" + salt + " " + address);
  return address;
}


salt: 0x0000000000000000000000000000000000000000000000000000000000028919

预先计算的合约地址:0x000013A1d7c63D56C8a5d58c93D1fb977cB409c5

4. 调用Create2 Factory合约

Transaction Hash: https://goerli.etherscan.io/tx/0xf0f442c3022e1001a080bf72747239dcf822c705bcb8c13cf6aa0505e97085e4

5. etherscan验证合约(Standard-Json-Input)

验证地址:https://goerli.etherscan.io/verifyContract

如何获取 Standard-Json-Input?

json路径:contracts/artifacts/build-info/4f94fb575ff59e02f4.json

input字段的内容。

如何使用Create2工厂创建合约并验证(Base Remix)?

CNYT.json

{
    "language": "Solidity",
    "sources":
    {
        "contracts/CNYT.sol":
        {
            "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"
        },
        "@openzeppelin/contracts/access/Ownable.sol":
        {
            "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"
        },
        "@openzeppelin/contracts/security/Pausable.sol":
        {
            "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"
        },
        "@openzeppelin/contracts/token/ERC20/ERC20.sol":
        {
            "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"
        },
        "@openzeppelin/contracts/utils/Context.sol":
        {
            "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"
        },
        "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol":
        {
            "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"
        },
        "@openzeppelin/contracts/token/ERC20/IERC20.sol":
        {
            "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"
        }
    },
    "settings":
    {
        "optimizer":
        {
            "enabled": true,
            "runs": 200
        },
        "outputSelection":
        {
            "*":
            {
                "":
                [
                    "ast"
                ],
                "*":
                [
                    "abi",
                    "metadata",
                    "devdoc",
                    "userdoc",
                    "storageLayout",
                    "evm.legacyAssembly",
                    "evm.bytecode",
                    "evm.deployedBytecode",
                    "evm.methodIdentifiers",
                    "evm.gasEstimates",
                    "evm.assembly"
                ]
            }
        }
    }
}

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