BitNotes Wallet Enables Offline Paper Ecash Transactions
The open-source app allows users in underbanked regions to verify financial tokens offline via physical paper notes.
Updated on Oct. 23, 2026 in Software
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Developer Calle has released BitNotes, a free, open-source Cashu wallet for Android and macOS that enables the printing of ecash as physical paper notes. The application, which supports offline verification, aims to provide financial tools for regions with limited banking infrastructure.
Why it matters
By facilitating the conversion of Bitcoin into physical, verifiable ecash, BitNotes addresses significant barriers in areas with unreliable internet connectivity. The tool represents a shift toward bridging traditional local currency systems with decentralized digital assets.
BitNotes is an open-source wallet released under MIT and Apache licenses that integrates Bitcoin Lightning and Ark for on-chain conversions. It automates swaps between independent mints to maintain transaction functionality.
The players
Calle
The software developer responsible for the creation of the Cashu protocol and the BitNotes application.
The details
The application functions by generating paper notes that represent ecash tokens, which are authenticated using mint public keys to allow for offline verification. It leverages the Cashu protocol to route transactions through multiple mints while automating the swap process between them. BitNotes also includes a bridge for the Rwandan Franc, enabling interaction between the local fiat currency and digital ecash assets.
Timeline
October 2022: Development of the Cashu protocol began.
October 22, 2026: The BitNotes application was released.
The Tech Race
BitNotes builds upon the existing Cashu protocol ecosystem, which has been under development since 2022 to improve ecash privacy and accessibility. This release competes with other mobile-integrated, multi-mint wallets by prioritizing offline physical note verification.
Users on Android and macOS can now download the application to generate and verify paper ecash notes offline. The tool is designed specifically for environments where network connectivity is inconsistent or limited, requiring no specialized hardware beyond a mobile device.
The takeaway
BitNotes offers a novel approach to financial access for those in underbanked regions by decoupling ecash from constant network uptime. Interested users should monitor for future public security audit reports, as none have been disclosed following this initial release.
Further reading
For broader trends in decentralized finance tools, visit our Software section.
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Would you trust a physical paper printout to secure your digital financial assets?
