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This is trivially solved by including a hash of the object in the ownership certificate.

> This is trivially solved by including a hash of the object in the ownership certificate.

This doesn’t fix any issue. If the URL changes, your NFT is worth nothing and you have no way to get the object back.

Wrapped NFTs

Would that be effective for low-res images like cryptopunks? Or can I create other 24 x 24 px images that have the same hash?

You can’t efficiently create hash collisions in a cryptographic hash