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

The free, open-source app for Android and macOS turns Bitcoin-backed ecash tokens into physical notes that can be checked offline 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. 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.

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