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contracts...Snowflake.sol

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.0;

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

import "hardhat/console.sol";

contract Snowflake is ERC721 {
    uint256 private _nextTokenId;

    constructor() ERC721("Snowflake", "SFLK") {}

    function safeMint(address to) public {
        uint256 tokenId = _nextTokenId++;
        _safeMint(to, tokenId);
    }

    // Send to ESCROW address
    function sendToESCROW(address escrow, uint256 tokenId) public {
        approve(escrow, tokenId);
    }

    // Returns the ESCROW address
    // 0x address means that this NFT has not been sent to ESCROW
    function isSentToESCROW(uint256 tokenId) public view returns(address) {
        return _getApproved(tokenId);
    }

    // Remove from ESCROW
    function removeFromESCROW(uint256 tokenId) public {
        approve(address(0), tokenId);
    }

    // Transfer to new owner from ESCROW
    function transferFromEscrow(uint256 tokenId, address from, address to) public {
        safeTransferFrom(from, to, tokenId);
    }
}