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Create an NFT Collection Using LSP7

This tutorial explores how to create a collection of digital assets, where each digital asset is the same. This method is useful for minting large quantities of NFTs at once efficiently (eg: tickets for an event).

note

This guide builds on top of a Hardhat project using TypeScript as described in the Getting Started section.

tip

The full code of this example can be found in the smart contract section of the 👾 lukso-playground repository.

When creating smart contracts representing digital assets on LUKSO, you will need to specify the token type and data keys for the 📄 LSP4 Digital Asset Metadata that will be stored in the 🗂️ ERC725Y storage of the Digital Asset. There are three different token types:

  • 0 = Token
  • 1 = NFT
  • 2 = Collection

For this example we will use the Token token type. You can create a custom 🌄 LSP7 Digital Asset Token that extends LSP7Mintable so that new assets can be minted by the owner of the smart contract.

contracts/Example1/EventTicketsNFT.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

// modules
import {
    LSP7Mintable
} from "@lukso/lsp-smart-contracts/contracts/LSP7DigitalAsset/presets/LSP7Mintable.sol";
import {
    _LSP4_TOKEN_TYPE_TOKEN
} from "@lukso/lsp-smart-contracts/contracts/LSP4DigitalAssetMetadata/LSP4Constants.sol";

contract EventTicketsNFT is LSP7Mintable {
    constructor(
        string memory eventName,
        string memory tokenSymbol,
        address contractOwner
    )
        LSP7Mintable(
            eventName,
            tokenSymbol,
            contractOwner,
            _LSP4_TOKEN_TYPE_TOKEN, // set the token type as Token
            true // make the token non divisible
        )
    {}
}

Next define the deployment script.

scripts/deployAndMintTickets.ts
import { ethers } from 'ethers';
import EventTicketsNFTArtifacts from './artifacts/EventTickets.json';

const accounts = await ethers.getSigners();
const deployer = accounts[0];

const contractFactory = new ethers.ContractFactory(
  EventTicketsNFTArtifacts.abi,
  EventTicketsNFTArtifacts.bytecode,
  deployer,
);

const luksoMeetupTickets = await contractFactory.deploy(
  'LUKSO Meetup #2',
  'MUP2',
  deployer.address,
);

// create 100 entry tickets.
// Give them to the deployer initially, who will distribute them afterwards.
await luksoMeetupTickets.mint(
  deployer.address, // recipient
  100, // amount
  true, // force sending to an EOA
  '0x', // data
);
const luksoMeetupTicketsAddress = await luksoMeetupTickets.getAddress();
console.log('NFT Collection deployed to:', luksoMeetupTicketsAddress);
console.log('Check the block explorer to see the deployed contract');

Finally, run the deploy script:

npx hardhat run --network luksoTestnet scripts/deployAndMintTickets.ts

You can now check out the NFT collection contract on the execution block explorer by pasting the address logged on the console to the search field of the block explorer.

References​