Thanks for your detailed answer.
I’m a bit of a blockchain sceptic outside of Bitcoin and the Liquid Network.
Discussion
the only reason I see to do that is to have undisputed chronological order between notes.
NIP03 already on it with open timestamp: https://github.com/nostr-protocol/nips/blob/master/03.md
This is it. ⬆️
Beware of blockchain word salad.
