Earlier quoted context omitted.
> all an NFT does is state "author X gives ownership of Y to Z", Incorrect. As @saurik says, but I'll just restate: an NFT also tells you the ordering of all such statements within one context (a single blockchain). So you can know whether this was the first such transfer by this owner or a subsequent one. This is the entire purpose of distributed databases, including blockchains.
Actually you can’t know it was by an ‘owner’ because nfts are not tied to the real world. You own nothing but the digital signature. There are so many problems being skated over here about provenance and ownership and nfts provide nothing of value in that domain, they’re just a get rich quick scheme.
The digital signature is thing that people want to own in the real world!