如何刻录erc721令牌?

Question

我正在尝试刻录erc721令牌。我继承了ERC721Burnable合约，但交易失败。在调试时，我发现在ERC721URIStorage合约中，它返回到:

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

我还希望合约的所有者能够修改元数据的属性，即使在代币被铸造和转移之后也是如此。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(尽管它缺少结尾})。您一定是在尝试烧掉一个不存在的令牌(也许它已经被烧掉了)?

要在NFT已经生成之后更改它的props，您所需要做的就是在来自令牌URI的返回值中返回不同的属性。