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Does it work like that with current 'OpenSea' NFTs and BBGC's 'Bitcoin NFTs' as well? Because I agree that what you describe is how an NFT should work. Independence from any specific centralised (or not) site / service / marketplace. I should be able to advertise and sell NFTs even on this forum in my opinion.
Yes, great idea. If we made it here on bitcointalk.org, I would give away 57 out of the 58 pics (except #1). It started in 2015 on the Bitcoin blockchain and we could continue it and test our idea on the Bitcoin blockchain. Bitcoin NFTs ... wow.