First of all, I'd like to confirm that I have the correct technical background of the way NFTs work in my mind. So, let's say Alice wants to sell her digital art (image) to Bob.
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I guess in theory something like this could work but it seems like too much effort to involve bitcoin as most people that buy nfts online probably don't going to go to the trouble of checking the bitcoin transactions and hashes and stuff. nfts are an ethereum thing not a bitcoin thing. as well, a hash doesn't really stop someone from counterfeiting an nft image.