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Since nobody has commented this yet - provably representing content rights is a great application for NFTs

Eh not really. You still need a central authority to determine whether the rights claimed by the NFT are authentic or fraudulent. Might as well have a central database.

Scenario: 2 users present an NFT claiming the rights to a song. Who wins?

Isn't the entire point of an NFT the fact that two users can't simultaneously possess it? I don't know if NFTs are the ideal approach but that seems like the one critique that doesn't apply.

For the NFT itself? yes. For the thing the NFT claims? no; that is up to some authority to decide whether to honor it.

e.g., 2 users have NFT which claims "I own the Mona Lisa". Who is right?

No it isn’t.

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