Open Source · Android · Bitcoin · Crypto Briefing
Calle announces BitNotes, a multi-mint Cashu wallet that prints ecash on paper
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The free, open-source app for Android and macOS turns Bitcoin-backed ecash tokens into physical notes that can be checked offline.
Key facts
- Calle, the developer behind the Cashu ecash protocol, announced BitNotes on October 22, 2026
- Join 34,000+ readers across crypto, finance, and policy
- In Cashu, a mint is the party that issues and redeems ecash
- The free, open-source app for Android and macOS turns Bitcoin-backed ecash tokens into physical notes that can be checked offline
Summary
Calle, the developer behind the Cashu ecash protocol, announced BitNotes on October 22, 2026. At its core, BitNotes is a wallet for Cashu, an ecash system built around Bitcoin. The headline feature is printing. The recipient can check a note against the issuing mint’s cryptographic signature without a network connection. For getting on-chain Bitcoin into the wallet, BitNotes uses Ark.