Step-by-Step Guide: Deploy Your Smart Contract on Nero Chain Testnet Using Hardhat

Introduction

Hardhat is a powerful development environment that simplifies the creation, testing, deployment, and verification of smart contracts. This guide will walk you through deploying a smart contract specifically on the Nero Chain Testnet.

What You'll Need

Node.js installed (Download Node.js)
Your wallet's private key (for testnet)
An API key from Neroscan (Get here)
Nero Chain Testnet tokens (Request from faucet)

Step 1: Project Initialization

Create a fresh directory for your smart contract and start your project:

mkdir NeroContract
cd NeroContract
npm init -y

Step 2: Install and Setup Hardhat

Install Hardhat and its necessary tools:

npm install --save-dev hardhat @nomicfoundation/hardhat-toolbox @nomicfoundation/hardhat-ignition-ethers

Then initialize Hardhat:

Choose the option "Create a JavaScript project" and complete the setup.

Step 3: Smart Contract Creation

You can write your own Solidity contract or quickly start using OpenZeppelin’s template for ERC-20 tokens:

ERC-20 Template

Save your contract file inside the contracts folder created by Hardhat.

Step 4: Configure Hardhat for Nero Chain

Create .env file in the root directory:

NERO_TESTNET_PROVIDER_URL=https://rpc-testnet.nerochain.io
PRIVATE_KEY=<your_private_key>
API_KEY=<your_neroscan_api_key>

Now configure hardhat.config.js:

require("@nomicfoundation/hardhat-toolbox");
require("@nomicfoundation/hardhat-ignition-ethers");
require('dotenv').config();

module.exports = {
  solidity: "0.8.24",
  defaultNetwork: "nero_testnet",
  networks: {
    nero_testnet: {
      url: process.env.NERO_TESTNET_PROVIDER_URL,
      accounts: [process.env.PRIVATE_KEY]
    }
  },
  etherscan: {
    apiKey: process.env.API_KEY,
    customChains: [
      {
        network: "nero_testnet",
        chainId: 689,
        urls: {
          apiURL: "https://api-testnet.neroscan.io/api",
          browserURL: "https://testnet.neroscan.io"
        }
      }
    ],
    enabled: true
  }
};

Step 5: Compile and Deploy

First, compile your smart contract:

npx hardhat compile

Deploy using Hardhat Ignition:

npx hardhat ignition deploy ./ignition/modules/YourDeployScript.js --network nero_testnet

Ensure you replace YourDeployScript.js with your actual deploy script filename.

Step 6: Verify Deployment

Check your smart contract deployment on the Nero Testnet Explorer.

Congratulations!

You've successfully created, deployed, and verified your smart contract on the Nero Chain Testnet. You're now ready to explore further possibilities with Hardhat and Nero Chain's robust environment.

What's Next?

Explore deployment to Nero Mainnet by adjusting configurations accordingly, and continue building secure and innovative blockchain applications.

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