this post was submitted on 18 Aug 2023
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You can easily end up with A gifting B a million and then B sending A the NFT for free, potentially with a trusted escrow service in between to make sure both of these actually happen. The NFT marketplaces are essentially already acting as escrow, so this isn't weird.
Only thing you could probably enforce is that moving something from one key to another requires a fee to be paid to the original artist, but that'd also trigger if A wants to move their assets to a different key (eg in or out of some hardware wallet, online wallet or marketplace). And if A and B trust each other strongly they can simply share the key.
Or they set up a multisig wallet, each creating one keypair directly on approved (tamper resistant) hardware wallet models, transfer it to the multisig wallet, and now control of the collection of multisig wallets means you control the token.
So now you trade it by trading the set of hardware wallets. Validated by each original participant including results from an audit of the key generation procedure with the hardware wallet.
No trace on the blockchain, and the trust model is more robust than simply taking the word for it as one of them share the private key claiming they did not keep their own copy.