一定時間後自動刻錄 NFT

如何創建功能以使 NFT 在到期時自動燃燒？ 在鑄造時，我儲存了 2 個參數鑄造日期和到期月數，所以我希望它在到期後自動燃燒

要檢查時間，請使用 Chainlink Keepers。您的契約將能夠檢查目前日期是否已過期。滿足條件後，您可以呼叫 OpenZeppelin 的 _burn 函式：

// SPXD-License-Identifier: MIT

pragma solidity ^0.8.8;

import "@chainlink/contracts/src/v0.8/interfaces/KeeperCompatibleInterface.sol";
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";

contract NFT is KeeperCompatibleInterface, ERC721 {
   //time is in unix
   //set mintDate and timeTillExpire

   uint256 public currentDate = block.timestamp;
   uint256 public mintDate;
   uint256 public timeTillExpire;
   uint256 public expireDate = mintDate + timeTillExpire;
   uint256 public tokenId = 0;

   //check if it has passed expiration
   function checkUpkeep(bytes memory)
       public
       override
       returns (bool needsUpkeep, bytes memory)
   {
       bool timePassed = (expireDate >= currentDate);
       needsUpkeep = (timePassed);
   }

   //burns token once condition is met
   function performUpkeep(bytes calldata) external override {
       (bool needsUpkeep, ) = checkUpkeep("");
       require(needsUpkeep == true, "Upkeep not needed.");
       _burn(tokenId);
   }

引用自：https://ethereum.stackexchange.com/questions/132130