On the other hand, it's trivial to show that an NFT is authentic and not a replica. The difficult part, as always with cryptography, is linking a public key to

On the other hand, it's trivial to show that an NFT is authentic and not a replica. The difficult part, as always with cryptography, is linking a public key to a know identity. If you have a trusted channel from the artist (e.g. their twitter feed) it's trivial for them to indicate that a given public key/wallet address is theirs and therefore anything minted on there is authentic and anything minted elsewhere is not. Determining if a real world piece of art is a replica or authentic can be fairly expensive. Determining if an NFT is authentic is much much cheaper.