Updated on March 18, 2022

Deploy using Truffle

This guide walks you through using Truffle migrations to deploy an NFT smart contract to the Palm network.

Prerequisites

• Access to PALM in order to pay the deployment transaction fees
• Access to a Palm Infura endpoint
• MetaMask wallet set up
• Node.js installed

Steps

1. Initialize your npm project:

   npm init
   

2. Install Truffle on your project folder:

   npm install --save truffle
   

3. Initialize Truffle on your project folder:

   npx truffle init
   

4. Install Truffle’s HDWalletProvider:

   npm install --save @truffle/hdwallet-provider
   

5. Write your contract:

   We’ll use a contract based on the OpenZeppelin library’s ERC-721 implementation.

   First, install the Open Zeppelin library in order to inherit its classes:

   npm install --save @openzeppelin/contracts
   

   Next, add the following smart contract to the “contracts” folder and name it “NFT.sol”:

   //Contract based on [https://docs.openzeppelin.com/contracts/4.x/erc721](https://docs.openzeppelin.com/contracts/4.x/erc721)
   // SPDX-License-Identifier: MIT
   pragma solidity ^0.8.0;
   
   import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
   import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
   import "@openzeppelin/contracts/utils/Counters.sol";
   import "@openzeppelin/contracts/access/Ownable.sol";
   
   contract NFT is ERC721URIStorage, Ownable {
       using Counters for Counters.Counter;
       Counters.Counter private _tokenIds;
   
       constructor() ERC721("NFT", "NFT") {}
   
       function mintNFT(address recipient, string memory tokenURI)
           public
           returns (uint256)
       {
           _tokenIds.increment();
   
           uint256 newItemId = _tokenIds.current();
           _mint(recipient, newItemId);
           _setTokenURI(newItemId, tokenURI);
   
           return newItemId;
       }
   }
   

6. Set environment variables with dotenv.

   Install dotenv:

   npm install --save dotenv
   

   Create a .env file in your project’s root folder, and set environment variables in the file as follows:

   PRIVATE_KEY = // The private key of the account you intend to use on the Palm network
   INFURA_PROJECT_ID = // Your infura project id
   

   Note

   Follow the link to see how your private key can be accessed on MetaMask

   Security warning

   Keep your private keys secret.

   Private keys must be kept secret and not committed to any code repository. In the example of this tutorial, the .env file should be added to your .gitignore file and kept local.

   For example, see MyCrypto’s Protecting Yourself and Your Funds guide.

7. Edit truffle-config.js with the following text:

   const HDWalletProvider = require("@truffle/hdwallet-provider");
   
   require('dotenv').config()  // store environment variables from '.env' to process.env
   
   module.exports = {
     compilers: {
       solc: {
         version: "^0.8.0"
       }
     },
     networks: {
       palm_testnet: {
         provider: () => new HDWalletProvider({
           providerOrUrl: `https://palm-testnet.infura.io/v3/${process.env.INFURA_PROJECT_ID}`,
           privateKeys: [
             process.env.PRIVATE_KEY
           ]
         }),
         network_id: 11297108099, // chain ID
         gas: 3000000, // gas limit
         gasPrice: 10000000000 // gas price in gwei
       },
       palm_mainnet: {
         provider: () => new HDWalletProvider({
           providerOrUrl: `https://palm-mainnet.infura.io/v3/${process.env.INFURA_PROJECT_ID}`,
           privateKeys: [
             process.env.PRIVATE_KEY
           ]
         }),
         network_id: 11297108109,
         gas: 3000000,
         gasPrice: 10000000000
       }
     }
   }
   

8. Deploy to the target Palm network environment:

   Palm Testnet

   npx truffle migrate --network palm_testnet
   

   Palm Mainnet

   npx truffle migrate --network palm_mainnet
   

   Example logs

   Compiling your contracts...
   ===========================
   > Everything is up to date, there is nothing to compile.
   
   Starting migrations...
   ======================
   > Network name:    'palm_testnet'
   > Network id:      11297108099
   > Block gas limit: 18800000 (0x11edd80)
   
   1_initial_migration.js
   ======================
   
     Deploying 'Migrations'
     ----------------------
     ...
     0xa5f964329db84e4afed621a520c37c1aa376596912e509722eedba49a2378cc2
   
     Migrations: 0x588a268a8db4784679c93b99bf6f3ab1c6a4831c
   
     Saving successful migration to network
     --------------------------------------
     ...
     0x6291aff7d5e14f24e8ee1047f10c84dc2ccd8eb17e8c60a52f2239164a8506c2
   
     Saving artifacts
     ----------------
     ...
   

9. Look up your deployment on the Palm network block explorer

   Go to https://explorer.palm-uat.xyz for testnet deployments and to https://explorer.palm.io for mainnet deployments and paste the address of your contract into the search bar.

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