How would you do that technically?
Discussion
Just thinking out loud here. But let's say you have a thread (ie chain) of posts. You check that the newer post (reply) has a later timestamp then the previous. Or else warn or error. It would be an opt-in NIP.
wow, arthurfranca just took the idea and made it into a NIP, thanks!
NIP-77 - Trust Clock
https://github.com/nostr-protocol/nips/blob/82325cd57aa6596cb6223b12fd8fda11c849f75c/77.md