my-nft

The simple NFT token on Mantle Sepolia Testnet.

Deploying the NFT

Part 1: Creating an NFT

• Install both Node.js (>14) and npm on your local machine. To check your Node version, run the following command in your terminal:

node -v

Step 1: Create a Node Project

• Create an empty Node project

mkdir my-nft && cd my-nft
npm init -y

Step 2: Create a Hardhat Project

npm install --save-dev hardhat
npx hardhat

You should then see a welcome message and options on what you can do. Use your “arrow keys” to navigate the small menu and Select Create a JavaScript project by clicking “Enter”.

Agree to all the prompts (project root, adding a .gitignore, and installing all sample project dependencies).

Now that we’re done with setting up Hardhat, let’s check if everything works properly.

npx hardhat test

Step 3: Install OpenZeppelin Contracts Package

npm install @openzeppelin/contracts

Step4: Create MyNFT.sol

Navigate to the contracts folder and create a new file called MyNFT.sol. Add the following code to the file.

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Burnable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract MyNFT is ERC721URIStorage, ERC721Burnable,Ownable {
constructor(address initialOwner)
        ERC721("MyNFT", "MNT")
        Ownable(initialOwner)
    {}
    function safeMint(address to, uint256 tokenId, string memory uri)
        public
        onlyOwner
    {
        _safeMint(to, tokenId);
        _setTokenURI(tokenId, uri);
    }
// The following functions are overrides required by Solidity.

    function tokenURI(uint256 tokenId)
        public
        view
        override(ERC721, ERC721URIStorage)
        returns (string memory)
    {
        return super.tokenURI(tokenId);
    }

    function supportsInterface(bytes4 interfaceId)
        public
        view
        override(ERC721, ERC721URIStorage)
        returns (bool)
    {
        return super.supportsInterface(interfaceId);
    }
}

ref:create and deploy an ERC721 NFT

Make sure that the version defined above (⁰.8.17) is the same as the version defined in the hardhat.config.js file.

Step 5: Connect MetaMask & Mantle to Your Project

Install the dotenv package in your project directory by running.

npm install dotenv --save

Then, create a .env file in the root directory (Main Folder) of your project, and add your MetaMask private key.

Note: The file name should be “.env” only, not “xyz.env” or “abc.env” Your .env should look like this:

PRIV_KEY = 0x"your exported private key"

Step 6: Update hardhat.config.js

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

/** @type import('hardhat/config').HardhatUserConfig */
module.exports = {
  solidity: "0.8.24",
  networks: {
    "mantle-testnet": {
      url: "https://rpc.sepolia.mantle.xyz/",
      accounts: [process.env.PRIV_KEY], // Uses the private key from the .env file
    }
  }
};

Step 7: Write the Deployment Script

Navigate to the scripts/ folder and replace the contents in the file deploy.js with the following:

async function main() {
   // Grab the contract factory 
   const MyNFT = await ethers.getContractFactory("MyNFT");

   // Start deployment, returning a promise that resolves to a contract object
   const myNFT = await MyNFT.deploy(); // Instance of the contract 
   console.log("Contract deployed to address:", myNFT.address);
}

main()
  .then(() => process.exit(0))
  .catch(error => {
    console.error(error);
    process.exit(1);
  });

Step 8: Deploy the Contract

npx hardhat run scripts/deploy.js --network mantle-testnet

You should have an output similar to the one shown below

Lock with 0.001ETH and unlock timestamp 1709373094 deployed to 0x741F731F537E5A9402550C693B43c9e6e645b4fD

Now that our contract is deployed, we can go to Mantle Sepolia Explorer and check if our contract was deployed.

Ref:

• How to create an NFT on Mantle Tutorial Part1
• How to create an NFT on Mantle Tutorial Part2
• How to create an NFT on Mantle Tutorial Part3