You might be interested in Keychat. Keychat is a chat app, built on Bitcoin Ecash, Nostr Protocol and Signal Protocol. Keychat is inspired by the postal system — stamps, post offices, letters. Keychat uses Bitcoin ecash as stamps and Nostr relays as post offices. Keychat uses Signal protocol to ensure message encryption security and meta-data privacy.

Keychat APP

Keychat is the super app for Bitcoiners. Autonomous IDs, Bitcoin ecash wallet, secure chat, and rich Mini Apps — all in Keychat.