ERC-1155

27min

Overview
Pros
Allows for the creation of multiple types of tokens within a single contract.
Supports both fungible and non-fungible tokens.
More efficient and cost-effective for creating a wide range of NFTs.
Cons
Relatively new and complex standard.
Limited support from Ethereum wallets and exchanges.
Requires advanced development skills to implement.
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🏁 Prerequisites
﻿Using Hardhat﻿﻿
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Tutorial
1. Write your ERC-1155 contract
We'll use a contract based on the OpenZeppelin library’s [ERC-1155 implementation]().
a) First, install the Open Zeppelin library in order to inherit its classes:
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Shell
npm install @openzeppelin/contracts
npm install @openzeppelin/contracts
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b) Next, create a file named NFT_1155.sol under the contracts folder.
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c) Lastly, add the following smart contract to NFT_1155.sol file. 
Note that we have named our contract NFT_1155, 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/ERC1155/ERC1155.sol";

contract NFT_1155 is ERC1155 {
    constructor(string memory uri) ERC1155(uri) {}
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;

import "@openzeppelin/contracts/token/ERC1155/ERC1155.sol";

contract NFT_1155 is ERC1155 {
    constructor(string memory uri) ERC1155(uri) {}
}
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2. Install Hardhat Deploy
Shell
npm install -D hardhat-deploy
npm install -D hardhat-deploy
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3. Install an Ethereum library
In this example, we will use Ether.js﻿
Shell
npm install --save-dev @nomiclabs/hardhat-ethers ethers@^5.0.0
npm install --save-dev @nomiclabs/hardhat-ethers ethers@^5.0.0
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4. 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
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Create an  .env file n your project's root folder, and set environment variables in the file as follows
﻿Intro to Infura﻿ 
﻿MetaMask Wallet Setup﻿﻿
PRIVATE_KEY = #The private key of the account you intend to use on the Palm network
INFURA_API_KEY = #Your Infura API key
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5. Edit hardhat.config.js with the following text:
You can add additional supported fields on the hardhat.config.js  file.
JS
require("dotenv").config()
require("@nomiclabs/hardhat-ethers")
require("hardhat-deploy")

const key = '';

module.exports = {
  solidity: "0.8.17",
  settings: {
    optimizer: {
      enabled: true,
      runs: 1000000,
    },
  },
  mocha: {
    timeout: 90000,
  },
  networks: {
    hardhat: {
      initialBaseFeePerGas: 0,
      blockGasLimit: 18800000,
    },
    palm_testnet: {
      url: `https://palm-testnet.infura.io/v3/${process.env.INFURA_API_KEY}`,
      accounts: [`0x` + process.env.PRIVATE_KEY],
      gasPrice: 1000,
      saveDeployments: true,
      deploy: ["scripts/"],
    },
    palm_mainnet: {
      url: `https://palm-mainnet.infura.io/v3/${process.env.INFURA_API_KEY}`,
      accounts: [`0x` + process.env.PRIVATE_KEY],
      gasPrice: 1000,
      saveDeployments: true,
      deploy: ["scripts/"],
    },
  },
  namedAccounts: {
    deployer: 0
  },
}
require("dotenv").config()
require("@nomiclabs/hardhat-ethers")
require("hardhat-deploy")

const key = '';

module.exports = {
  solidity: "0.8.17",
  settings: {
    optimizer: {
      enabled: true,
      runs: 1000000,
    },
  },
  mocha: {
    timeout: 90000,
  },
  networks: {
    hardhat: {
      initialBaseFeePerGas: 0,
      blockGasLimit: 18800000,
    },
    palm_testnet: {
      url: `https://palm-testnet.infura.io/v3/${process.env.INFURA_API_KEY}`,
      accounts: [`0x` + process.env.PRIVATE_KEY],
      gasPrice: 1000,
      saveDeployments: true,
      deploy: ["scripts/"],
    },
    palm_mainnet: {
      url: `https://palm-mainnet.infura.io/v3/${process.env.INFURA_API_KEY}`,
      accounts: [`0x` + process.env.PRIVATE_KEY],
      gasPrice: 1000,
      saveDeployments: true,
      deploy: ["scripts/"],
    },
  },
  namedAccounts: {
    deployer: 0
  },
}
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6. Compile your Contract
To make sure everything is working so far, let’s compile our contract:
Shell
Example Response
npx hardhat compile
npx hardhat compile
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7. Write a deploy script
a) Navigate to the scripts folder and create a new file called deploy_NFT_1155.js
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b) Add the below code
JS
module.exports = async ({
    getNamedAccounts,
    deployments,
    }) => {
    const {deploy} = deployments;
    const {deployer} = await getNamedAccounts();

    console.log("Contract deployed to address:", deployer);

    // Deploy "NFT" if the contract was never deployed or if the code has changed since the last deployment
     await deploy('NFT_1155', {
        from: deployer,
        gasLimit: 4000000,
        args: ["https://NFT1155/{id}.json"],
        log: true
    });
};
module.exports = async ({
    getNamedAccounts,
    deployments,
    }) => {
    const {deploy} = deployments;
    const {deployer} = await getNamedAccounts();

    console.log("Contract deployed to address:", deployer);

    // Deploy "NFT" if the contract was never deployed or if the code has changed since the last deployment
     await deploy('NFT_1155', {
        from: deployer,
        gasLimit: 4000000,
        args: ["https://NFT1155/{id}.json"],
        log: true
    });
};
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8. Deploy to the target Palm network environment
Palm Testnet
Palm Mainnet
Example log
npx hardhat --network palm_mainnet deploy
npx hardhat --network palm_mainnet deploy
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﻿TLDR; How This is Working﻿
The task will execute the scripts in the scripts folder and saves the contract deployments to disk. Each deployment is saved into the deployments folder for the specific network.
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9. Look Up Your Deployment on the Palm Network Block Explorer
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Testnet
Mainnet
Explorer URL
﻿https://explorer.palm-uat.xyz﻿
﻿https://explorer.palm.io﻿
Paste your contract address into the search bar.
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Get your contract address in 2 ways:
Console.log() output Contract deployed to address: contractNumber 
In deployments/palm_testnet/NFT_1155.json or deployments/palm_mainnet/NFT_1155.json where you will also find the ABI (Application Binary Interface) information.
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You will see something like this upon successful deployment 👇 
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10. Verify via Sourcify
Palm Testnet
Palm Mainnet
Example log
npx hardhat --network palm_mainnet sourcify
npx hardhat --network palm_mainnet sourcify
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﻿Using Sourcify﻿﻿
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Next Step 👉 Mint your NFT
Using the Smart Contract you just deployed you can now Mint NFTs with Hardhat﻿ 