RuneOfAlpha.sol

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;

import {ERC721} from "./ERC721.sol";

contract Runes is ERC721 {
    uint256 public constant RUNE_OF_ALPHA = 6;

    uint256 public lastDelta;
    uint256 public lastPurchaseBasefee;
    
    constructor() ERC721("Runes", "RUNES") {
        _mint(msg.sender, RUNE_OF_ALPHA);
        lastPurchaseBasefee = block.basefee;
    }
    
    function proveAlpha() external {
        uint256 delta = lastPurchaseBasefee - block.basefee;
        require(delta > lastDelta, "Not enough alpha");
        lastPurchaseBasefee = block.basefee;
        lastDelta = delta;
        _transfer(ownerOf(RUNE_OF_ALPHA), msg.sender, RUNE_OF_ALPHA);
    }
}