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.
https://www.keychat.io/
Where’s the app?
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The app is still under development; we will release the code and the Android APK.