使用Hardhat验证 Solidity 源码 （Ethereum or BSC）

hardhat-etherscan 这个插件可以帮助你在Etherscan上验证 Solidity 合约的源代码。

• 只需提供部署地址和构造函数参数，插件将在本地检测要验证的合约。
• 如果您的合约使用 Solidity库，插件将检测它们并自动处理它们。你不需要对它们做任何事情。
• 验证过程的模拟将在本地运行，允许插件检测和传达过程中的任何错误。
• 一旦模拟成功，合同将使用 Etherscan API 进行验证。

安装：

npm install --save-dev @nomiclabs/hardhat-etherscan  

并将以下语句添加到您的hardhat.config.js：

require("@nomiclabs/hardhat-etherscan");

将以下 Etherscan 配置添加到您的hardhat.config.js文件中：

module.exports = {
  solidity: {
    version: '0.8.4',
    settings: {
      optimizer: {
        enabled: true,
        runs: 200,
      },
    },
  },
  contractSizer: {
    alphaSort: true,
    runOnCompile: true,
    disambiguatePaths: false,
  },
  networks: {
    tbsc: {
      url: "https://data-seed-prebsc-1-s1.binance.org:8545/",
      accounts:
        ["你的私钥"],
    },
    ropsten: {
      url: "https://ropsten.infura.io/v3/9aa3d95b3bc440fa88ea12eaa4456161",
      accounts:
        ["你的私钥"],
    },
  },
  etherscan: {
    // etherscan:
    // bscscan:
    apiKey: "your apiKey",
  },
};

部署到bsc测试链：

D:MySCDMToken>npx hardhat run scripts/yourtoken.js --network tbsc   
Compiling 9 files with 0.8.4
Compilation finished successfully
YourToken deployed to: 0x915D4D9aEe18F4c22ab6e2dA51aD9473E4b929B3

运行verify任务（合约源代码、部署网络、合约的地址）

D:MySCDMToken>npx hardhat verify --contract contracts/Greeter2.sol:YourToken  --network tbsc 0x915D4D9aEe18F4c22ab6e2dA51aD9473E4b929B3 
	Nothing to compile
	Compiling 1 file with 0.8.4
	Successfully submitted source code for contract
	contracts/Greeter2.sol:YourToken at 0x915D4D9aEe18F4c22ab6e2dA51aD9473E4b929B3
	for verification on Etherscan. Waiting for verification result...
	
	Successfully verified contract YourToken on Etherscan.
	https://testnet.bscscan.com/address/0x915D4D9aEe18F4c22ab6e2dA51aD9473E4b929B3#code

另附：
scripts/yourtoken.js

const hre = require("hardhat");
async function main() {

  // We get the contract to deploy
  const Greeter = await hre.ethers.getContractFactory("YourToken");
  const greeter = await Greeter.deploy();

  await greeter.deployed();

  console.log("YourToken deployed to:", greeter.address);
}

// We recommend this pattern to be able to use async/await everywhere
// and properly handle errors.
main()
  .then(() => process.exit(0))
  .catch((error) => {
    console.error(error);
    process.exit(1);
  });

contracts/YourToken.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.2;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract YourToken is ERC20, ERC20Burnable, Pausable, Ownable {
    constructor() ERC20("YourToken", "YTK") {
        _mint(msg.sender, 10000 * 10 ** decimals());
    }

    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
        whenNotPaused
        override
    {
        super._beforeTokenTransfer(from, to, amount);
    }
}