Ok, so here is a draft NIP for a Proof of Work Service Provider. All Feedback welcome!

Would love to hear from relay operators, open source relay contributors, client apps, Nostr users.

Basically, it allows for you to generate an event POW before signing as part of a relay membership or pre-paid credit system. Ultimately to succeed, Nostr apps would need to offer it.

I have a fully functional rust implementation I’ll likely open source (if enough interest), that just needs the payment integration code - and a bunch of testing.