Using Truffle

27min
Overview
This guide walks you through using Truffle migrations to deploy an NFT smart contract to the Palm network.
🏁 Prerequisites
﻿Get PALM Tokens﻿ to pay the deployment transaction fees.
﻿Connect to Palm network﻿﻿
﻿MetaMask Wallet Setup﻿ to get your private key.
Install Node.js.
Tutorial
1. Initialize Your NPM Project
Shell
npm init
npm init
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2. Install Truffle on Your Project Folder
Shell
npm install --save truffle
npm install --save truffle
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3. Initialize Truffle 
Shell
npx truffle init
npx truffle init
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4. Install Truffle's HDWalletProvider﻿
Shell
npm install --save @truffle/hdwallet-provider
npm install --save @truffle/hdwallet-provider
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5. Add your Contract
We'll use a contract based on the OpenZeppelin library’s ERC-721 implementation.
a) First, install the Open Zeppelin library in order to inherit its classes:
Shell
npm install --save @openzeppelin/contracts
npm install --save @openzeppelin/contracts
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b) Next, create a file named NFT.sol under the  contracts folder.
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c) Lastly, add the following smart contract to NFT.sol file. Note that we have named our contract NFT, this can be any name.
The name will be important in the next step.
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JS
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;

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

contract NFT is ERC721 {
    constructor() ERC721("MyERC721", "M721") {}
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;

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

contract NFT is ERC721 {
    constructor() ERC721("MyERC721", "M721") {}
}
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6. Create Your Migration File
What are Migrations?
Migrations are JavaScript files that help you deploy contracts to the Ethereum network. These files are responsible for staging your deployment tasks, and they're written under the assumption that your deployment needs will change over time.`
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Under the migrations folder, create your filename: 1_example_migration.js
create your filename: 1_example_migration.js
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Additional Resources
﻿Truffle Migrations﻿
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JS
  // At the beginning of the migration, we tell Truffle
  // which contracts we'd like to interact with via the artifacts.require() method.
  var MyContract = artifacts.require("NFT");

  //The deployer object is your main interface for staging deployment tasks,
  // and its API is described at the bottom of this page.
  module.exports = function(deployer) {
    // deployment steps
    deployer.deploy(MyContract);
  };
  // At the beginning of the migration, we tell Truffle
  // which contracts we'd like to interact with via the artifacts.require() method.
  var MyContract = artifacts.require("NFT");

  //The deployer object is your main interface for staging deployment tasks,
  // and its API is described at the bottom of this page.
  module.exports = function(deployer) {
    // deployment steps
    deployer.deploy(MyContract);
  };
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7. Set environment variables with dotenv﻿
Install dotenv
Shell
npm install --save dotenv
npm install --save dotenv
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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.

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Create a .gitignore  file
A great example of a Solidity .gitignore file can be found here﻿
Add a .gitignore file
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Create an  .env file n 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_API_KEY = #Your Infura API key
.env file
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8. Edit truffle-config.js with the following text
JS
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/${process.env.INFURA_API_KEY}`,
        privateKeys: [
          process.env.PRIVATE_KEY
        ]
      }),
      network_id: 11297108099, // chain ID
      gasPrice: 1000 // gas price in gwei
    },
    palm_mainnet: {
      provider: () => new HDWalletProvider({
        providerOrUrl: `https://palm-mainnet.infura.io/v3/${process.env.INFURA_API_KEY}`,
        privateKeys: [
          process.env.PRIVATE_KEY
        ]
      }),
      network_id: 11297108109,
      gasPrice: 1000
    }
  }
}
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/${process.env.INFURA_API_KEY}`,
        privateKeys: [
          process.env.PRIVATE_KEY
        ]
      }),
      network_id: 11297108099, // chain ID
      gasPrice: 1000 // gas price in gwei
    },
    palm_mainnet: {
      provider: () => new HDWalletProvider({
        providerOrUrl: `https://palm-mainnet.infura.io/v3/${process.env.INFURA_API_KEY}`,
        privateKeys: [
          process.env.PRIVATE_KEY
        ]
      }),
      network_id: 11297108109,
      gasPrice: 1000
    }
  }
}
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9.  Deploy to the Target Palm Network Environment
Palm Testnet
Palm Mainnet
Example Logs
npx truffle migrate --network palm_testnet
npx truffle migrate --network palm_testnet
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10. Look Up Your Deployment on the Palm Network Block Explorer
Paste your `contract address:` from the log of the previous step into the search bar. It may take 10-20 minutes to appear.

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Testnet
Mainnet
Explorer URL
﻿https://explorer.palm-uat.xyz﻿
﻿https://explorer.palm.io﻿
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If successful, you will see something like this screenshot:
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11.  Install Truffle-Plugin-Verify 
This plugin will allow you to automatically verify your smart contracts's source code straight from the CLI. 
Shell
npm install -D truffle-plugin-verify
npm install -D truffle-plugin-verify
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12.  Add the plugin to your truffle-config.js file
JS
const HDWalletProvider = require("@truffle/hdwallet-provider");

require('dotenv').config()  // store environment variables from '.env' to process.env

module.exports = {
  plugins: ['truffle-plugin-verify'], //<== added line
  compilers: {
    solc: {
      version: "^0.8.0"
    }
  },
  networks: {
    palm_testnet: {
      provider: () => new HDWalletProvider({
        providerOrUrl: `https://palm-testnet.infura.io/v3/${process.env.INFURA_API_KEY}`,
        privateKeys: [
          process.env.PRIVATE_KEY
        ]
      }),
      network_id: 11297108099, // chain ID
      gasPrice: 1000, // gas price in gwei
    },
    palm_mainnet: {
      provider: () => new HDWalletProvider({
        providerOrUrl: `https://palm-mainnet.infura.io/v3/${process.env.INFURA_API_KEY}`,
        privateKeys: [
          process.env.PRIVATE_KEY
        ]
      }),
      network_id: 11297108109,
      gasPrice: 1000,
    }
  }
}
const HDWalletProvider = require("@truffle/hdwallet-provider");

require('dotenv').config()  // store environment variables from '.env' to process.env

module.exports = {
  plugins: ['truffle-plugin-verify'], //<== added line
  compilers: {
    solc: {
      version: "^0.8.0"
    }
  },
  networks: {
    palm_testnet: {
      provider: () => new HDWalletProvider({
        providerOrUrl: `https://palm-testnet.infura.io/v3/${process.env.INFURA_API_KEY}`,
        privateKeys: [
          process.env.PRIVATE_KEY
        ]
      }),
      network_id: 11297108099, // chain ID
      gasPrice: 1000, // gas price in gwei
    },
    palm_mainnet: {
      provider: () => new HDWalletProvider({
        providerOrUrl: `https://palm-mainnet.infura.io/v3/${process.env.INFURA_API_KEY}`,
        privateKeys: [
          process.env.PRIVATE_KEY
        ]
      }),
      network_id: 11297108109,
      gasPrice: 1000,
    }
  }
}
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13.  Verify Contract 
Use the name of your contract to verify on the desired network. 
Palm Testnet
Palm Mainnet
Example Log
npx truffle run verify NFT --network palm_testnet
npx truffle run verify NFT --network palm_testnet
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