如何刻录erc721令牌？

Question

我正在尝试烧掉erc721令牌。我继承了ERC721Burnable合同，但是事务得到了failed.While调试--我发现在ERC721URIStorage合同中，它返回到：

if (bytes(_tokenURIs[tokenId]).length != 0) {
    delete _tokenURIs[tokenId];
}

此外，我希望契约的所有者能够修改元数据的属性，即使在令牌被创建和传输之后也是如此。这是我的合同：

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Burnable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Counters.sol";

contract MyNFT is ERC721, ERC721Enumerable, ERC721URIStorage, ERC721Burnable, Ownable {
    using Counters for Counters.Counter;

    Counters.Counter private _tokenIdCounter;
    uint MAX_SUPPLY=1;

    constructor() ERC721("MyNFT", "MNFT") {}

    function safeMint(address to, string memory uri) public onlyOwner {
        require(totalSupply() < MAX_SUPPLY, "Can be minted only one time.");
        uint256 tokenId = _tokenIdCounter.current();
        _tokenIdCounter.increment();
        _safeMint(to, tokenId);
        _setTokenURI(tokenId, uri);
    }

    // The following functions are overrides required by Solidity.

    function _beforeTokenTransfer(address from, address to, uint256 tokenId)
        internal
        override(ERC721, ERC721Enumerable)
    {
        super._beforeTokenTransfer(from, to, tokenId);
    }

Answer 1

您提供的代码可以工作(尽管它缺少一个结束} )。你一定是想烧掉一个不存在的令牌(也许它已经被烧掉了)？

要更改NFT的支柱，只需从令牌URI返回返回值中的不同属性即可。