To both of you, you might be interested to know about NIP-13 which allows relays and clients to require proof of work before doing anything with a note. So no capcha or anything like that required, if relays began requiring this or clients began requiring it it would work just like hashcash for spam mitigation, I would like to see more nostr software implementing this.





 https://github.com/nostr-protocol/nips/blob/master/13.md