Write Your First NFT

Prerequisites

Before you begin, ensure you have the following:

• Git: Used for code management and obtain examples.

• Node.js: Install it from nodejs.org.

• Pharos Devnet/Testnet Access: Access to a Pharos node (local or remote) for interacting with the blockchain.

Setup 1: Install Hardhat

• Hardhat

Setup 2: Set Up the Project

Clone the example repo:

git clone https://github.com/PharosNetwork/examples
cd examples/nft/hardhat/contract

Install OpenZeppelin Contracts:

npm install

Setup 3: Write the NFT Contract

Create a New Solidity File:

• Create a new file for your NFT contract:

touch contracts/Token.sol

Write the Token Contract:

• Open contracts/Token.sol in your favorite text editor and add the following code:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";

contract Token is ERC721 {
    uint256 id;
    constructor() ERC721("Token", "MTK") {}

    function mint(address to) public returns (uint256) {
        id += 1;
        _mint(to, id);
        return id;
    }
}

Compile the Smart Contract:

npx hardhat compile

Test the Smart Contract

npx hardhat test

Step 4: Deploy the Token Contract

Set the private key:

npx hardhat vars set PRIVATE_KEY

Deploy the Contract:

npx hardhat ignition deploy ./ignition/modules/Token.js --network pharos

Step 5: Verify the Token Contract

Add the following content to your hardhat.config.js file

Field	Value
chain_name	pharos
chain_id	688688
rpc_endpoint	https://testnet.dplabs-internal.com
api_host	https://api.socialscan.io/pharos-testnet/v1/explorer/command_api/contract
explorer_url	https://testnet.pharosscan.xyz/

require("@nomicfoundation/hardhat-toolbox");

/** @type import('hardhat/config').HardhatUserConfig */
module.exports = {
  solidity: "0.8.28",
  networks: {
    pharos: {
      url: "https://testnet.dplabs-internal.com",
      accounts: [vars.get("PRIVATE_KEY")],
    },
  },
  etherscan: {
    customChains: [
      {
        network: "pharos",
        chainId: 688688,
        urls: {
          apiURL: "https://api.socialscan.io/pharos-testnet/v1/explorer/command_api/contract",
          browserURL: "https://testnet.pharosscan.xyz/",
        },
      },
    ],
    apiKey: {
      pharos: "Put a random string", // Note we don't need a apiKey here, just leave a random string
    },
  }
};

Run the hardhat verify command

npx hardhat verify --network pharos <contract_address> <constructor_args_params>

Troubleshooting

• Contract Deployment Fails: Ensure you have enough testnet tokens to cover the deployment cost.

• Interaction Issues: Verify that the contract address and ABI are correct.

• Insufficient Balance: Ensure your wallet has enough tokens to transfer.

Conclusion

Now that you’ve created and deployed your first NFT using Hardhat.

This guide provides a comprehensive introduction to to creating and deploying an NFT on the Pharos blockchain. If you encounter any issues, refer to the Troubleshooting section or consult the Hardhat documentation. Happy building! 🚀