Hardhat

This is an example of deploying a contract using Hardhat.

1. Create a Hardhat project

Run the command below to initialize the Hardhat project.

mkdir erc20-project
cd erc20-project
npm init -y
npm install --save-dev hardhat @nomicfoundation/hardhat-toolbox @nomicfoundation/hardhat-verify dotenv
npx hardhat

2. Write the contract code

Create a contracts directory and save the ERC20 contract as ERC20.sol file inside.

3. Configure the environment

Set the CROSS Chain RPC address and private key in the .env file.

CHAIN_ID=612044
RPC_URL="https://testnet.cross-nexus.com:22001"
EXPLORER="https://testnet-explorer.cross-nexus.com"
EXPLORER_API="https://testnet-explorer.cross-nexus.com/api"
PRIVATE_KEY="<배포할 계정의 개인키 입력>"

4. Configure Hardhat configuration file

Configure the hardhat.config.js file like below.

require("dotenv").config();
require("@nomicfoundation/hardhat-toolbox");
require("@nomicfoundation/hardhat-verify");

module.exports = {
  solidity: "0.8.28",
  networks: {
    crossTestnet: {
      url: process.env.RPC_URL,
      accounts: [process.env.PRIVATE_KEY],
    },
  },
  sourcify: {
    enabled: true
  },
  etherscan: {
    apiKey: {
      crossTestnet: "DUMMY_API_KEY",
    },
    customChains: [
      {
        network: "crossTestnet",
        chainId: process.env.CHAIN_ID,
        urls: {
          apiURL: process.env.EXPLORER_API,
          browserURL: process.env.EXPLORER,
        },
      },
    ],
  },
};

5. Compile the contract

Compile the contract with the following command

npx hardhat compile

6. Deploy the contract

Create a scripts directory and create a scripts/deploy.js file and execute the code below.

const { ethers } = require("hardhat");

async function main() {
  const [deployer] = await ethers.getSigners();

  console.log("Deploying contracts with account:", deployer.address);

  const ERC20 = await ethers.getContractFactory("ERC20");
  const erc20 = await ERC20.deploy("My ERC20", "M20", 18, ethers.parseUnits("1000000", 18));

  await erc20.waitForDeployment();

  console.log("ERC20 deployed at:", await erc20.getAddress());
}

main().catch((error) => {
  console.error(error);
  process.exitCode = 1;
});

Deploy an ERC20 contract with the following command

npx hardhat run scripts/deploy.js --network crossTestnet

When the deployment is complete, the contract address will appear.

7. Verify the contract

Run the following command to verify the contract.

npx hardhat verify --network crossTestnet <deployed contract address> “My ERC20” “M20” 18 1000000000000000000000000

Note: Deployed contracts can be found in the CROSS Chain Testnet Explorer.