Also: Someone else can generate an NFT with the same URL in it. Thus, it becomes an exercise to verify the NFT out of band. At that point, in a lot of situations, it's not the NFT that's certifying the ownership, it's the public announcement by the artist. There's maybe a little to be gained because from that point forward, any transfers may be verified but... In the end the root of trust remains the public, out-of-band announcement of the NFT.
It is also worth noting that, in a lot of cases, NFTs don't actually confer any sort of special rights or ownership over the art. Often, NFTs are really just signed links to a thing that was not actually sold to you, with the actual legal ownership of the art staying with the seller.
It is also worth noting that, in a lot of cases, NFTs don't actually confer any sort of special rights or ownership over the art. Often, NFTs are really just signed links to a thing that was not actually sold to you, with the actual legal ownership of the art staying with the seller.