Bitchat runs locally over Bluetooth mesh without servers when infra is down. But it can also bridge to the wider world via Nostr relays. Those relays aren’t “servers” in the WhatsApp/Signal sense (centralized, phone-number bound) — they’re dumb message broadcasters anyone can run, no single point of control. So: local mesh when offline, Nostr relays when online. Correct me if I’m wrong please! 🙏🏼