[qqii]

Of course! The blockchain is only decentralised compared to a centralised service such as Sotheby's and doesn't remove the third party entirely. The thing is unless you restrict the requirements of the artwork and the transaction not involving a third party actually restricts future guarentees that can be made to third parties.

If the restrictions of never involving third parties (in proofs of ownership or otherwise) is acceptable, then there's no need for any schema bar making the transaction itself.

The issue with removing the third party entirely (as the auther suggests) is the verifiability of the timestamp to any interested third parties. The simplest scenario is proof of existence of the artwork at time T. Without a timestamping mechanism there's nothing stopping the creator lying about when it was created, or when this transaction took place.