CD184: CALLE - BITCHAT AND CASHU

2025-11-24

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Calle is the creator and lead maintainer of the Cashu open source protocol. Cashu enables users to easily use bitcoin in a private, offline, and programmable way. Calle is also the maintainer of Bitchat android, a cross platform meshnet app that enables users to chat and send bitcoin without an internet connection.Calle on Nostr: https://primal.net/calleCalle on X: https://x.com/callebtcBitchat: https://bitchat.free/Cashu: https://cashu.space/Hackathon: https://nutnovember.org/AOS:...

Calle is the creator and lead maintainer of the Cashu open source protocol. Cashu enables users to easily use bitcoin in a private, offline, and programmable way. Calle is also the maintainer of Bitchat android, a cross platform meshnet app that enables users to chat and send bitcoin without an internet connection.

Calle on Nostr: https://primal.net/calle
Calle on X: https://x.com/callebtc
Bitchat: https://bitchat.free/
Cashu: https://cashu.space/
Hackathon: https://nutnovember.org/
AOS: https://andotherstuff.org/

EPISODE: 184
BLOCK: 925030
PRICE: 1126 sats per dollar

(00:04:44) Bitchat: Bluetooth Mesh Without Internet

(00:06:21) Protests and Outages Drive Downloads: Nepal, Indonesia, Madagascar, Côte d’Ivoire, Jamaica

(00:09:51) Predicting Unrest from Download Spikes

(00:14:27) Adding Nostr Transport: Hyperlocal Mesh vs. Geohash Chats

(00:18:03) Geolocated Relay Selection

(00:23:56) Ephemeral Identity, UX, and Censorship Considerations

(00:28:37) Mesh Upgrades: Voice, Images, Files, Source Routing like Tor

(00:30:23) WiFi Aware Mesh and Background Operation to Boost Range and Uptime

(00:34:15) White Noise vs. Bitchat

(00:40:00) Protocols and Transports: Weaving White Noise, Cashu, and Bitchat

(00:43:48) Transport Neutral Design: Cashu and Nostr

(00:45:57) Cashu Progress: Shipping Libraries, Dev Ecosystem Growth