Smart Contract de una colección de NFTs

#blockchain #solidity #nft #nfts

Aquí un smart contract básico de colección de NFTs ERC-721. En este video lo lanzamos en un Testnet, subimos la metadata e imágenes a Github y vemos el resultado en OpenSea.

// contracts/GameItem.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.7;

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

contract MyNFT is ERC721 {
    uint256 public MAX_TOKEN = 5;
    uint256 public PRICE = 0.01 ether;
    address public CREATOR = 0x0000000000000000000000000000000000000000;
    uint256 public token_count;

    constructor() ERC721("My NFT", "MNFT") {}

    function _baseURI() internal view virtual override returns (string memory) {
        return "MIURL";
    }

    function mintNFT(address to) public payable
    {
        require(token_count < MAX_TOKEN, "Sold out");
        require(msg.value >= PRICE, "Must pay price");
        _mint(to, token_count);
        token_count  += 1;
    }

    function withdrawAll() public
    {
        (bool success, ) = CREATOR.call{value:address(this).balance}("");
        require(success, "Transfer failed.");
    }
}