nft-standards

1# NFT Standards
2 
3Master ERC-721 and ERC-1155 NFT standards, metadata best practices, and advanced NFT features.
4 
5## When to Use This Skill
6 
7- Creating NFT collections (art, gaming, collectibles)
8- Implementing marketplace functionality
9- Building on-chain or off-chain metadata
10- Creating soulbound tokens (non-transferable)
11- Implementing royalties and revenue sharing
12- Developing dynamic/evolving NFTs
13 
14## ERC-721 (Non-Fungible Token Standard)
15 
16```solidity
17// SPDX-License-Identifier: MIT
18pragma solidity ^0.8.0;
19 
20import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
21import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
22import "@openzeppelin/contracts/access/Ownable.sol";
23import "@openzeppelin/contracts/utils/Counters.sol";
24 
25contract MyNFT is ERC721URIStorage, ERC721Enumerable, Ownable {
26    using Counters for Counters.Counter;
27    Counters.Counter private _tokenIds;
28 
29    uint256 public constant MAX_SUPPLY = 10000;
30    uint256 public constant MINT_PRICE = 0.08 ether;
31    uint256 public constant MAX_PER_MINT = 20;
32 
33    constructor() ERC721("MyNFT", "MNFT") {}
34 
35    function mint(uint256 quantity) external payable {
36        require(quantity > 0 && quantity <= MAX_PER_MINT, "Invalid quantity");
37        require(_tokenIds.current() + quantity <= MAX_SUPPLY, "Exceeds max supply");
38        require(msg.value >= MINT_PRICE * quantity, "Insufficient payment");
39 
40        for (uint256 i = 0; i < quantity; i++) {
41…