Calle launches BitNotes, a multi-mint Cashu wallet that prints ecash on paper

Bitcoin has spent years trying to act like cash. A pseudonymous developer has now taken that idea literally. Calle, the developer behind the Cashu ecash protocol, announced BitNotes on October 22, 2026. It is a free, open-source, multi-mint Cashu wallet that lets users print ecash as physical paper notes. Those notes can be verified offline before anyone tries to redeem them. What BitNotes actually does At its core, BitNotes is a wallet for Cashu, an ecash system built around Bitcoin. Ecash tokens are issued by entities called mints. Users hold those tokens and pass them around much like digital bearer instruments. The headline feature is printing. BitNotes can generate paper notes that represent ecash tokens. Verification happens offline using the mint’s public keys. The recipient can check a note against the issuing mint’s cryptographic signature without a network connection. Redemption comes later, once the holder is ready to turn the note back into digital ecash. The notes are also designed to be tamper-evident. If someone has messed with a note, the holder should be able to tell. The app handles standard digital ecash transfers too. It integrates with Lightning, Bitcoin’s laye...