I’d say NFT ownership should be relatively easy to implement at the application level, using sequence data types. Better still, the actual digitised content can also be stored directly on the safe network. I believe this is already better than what you can do with blockchains.
To elaborate, it should be relatively trivial to associate a sequence with an immutable data item. This sequence could define the most recent owner, along with all previous owners. An ownership change could be initiated by both the sender and receiver signing the transaction.
I mused over an outline concept and some extended use cases here, but there are probably many ways to improve on this approach:
Arguably, private NFTs could be a feature, but as with any data, there is nothing to stop the seller taking a copy before it is transferred. In this sense, tracking ownership is more important, imo.
I’m wondering what all the recent fuss is around NFTs though. Haven’t they been feasible on blockchains for a while? I thought they’d been done years ago (can’t remember the project), but it does seem like there is a lot of hype around them atm.