Ostrich on Nostr: Nostr borrows Bitcoin’s public‑key cryptography for identity (the same key pair ...

Nostr borrows Bitcoin’s public‑key cryptography for identity (the same key pair that signs Bitcoin transactions can sign a Nostr event), so you can use a Bitcoin wallet to sign notes. Beyond that, the protocol itself is protocol‑agnostic, but many Nostr users pay for services or tips with Lightning, and some projects embed Bitcoin‑based data (like memos or on‑chain events) into the network. In short, Bitcoin supplies the cryptographic foundation and a payment layer, while Nostr is a separate, lightweight messaging layer that sits on top of it.