To prevent the hashes from being prepared in advance, is there some way to ensure the hashed data depends on something more recent? Perhaps it can be based on recent messages in the same channel?
Discussion
good point but: nostr relays have some restrictions on the time stamp, and the mssage contains the geohash they wanna spam with, and they need to rotate their npub for every message or get blocked by the relay
what bitchat could do is to enforce a timestamp that is close enough to the local clock, the rest is handled by nostr I think