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About Cashu

Cashu is a free and open-source Chaumian ecash protocol built on Bitcoin. It implements David Wagner's variant of Chaumian blind signatures, which prevents mints from linking transactions to individual users without requiring user account databases. The protocol uses a mint-and-wallet architecture in which mints issue ecash bearer tokens in exchange for deposited bitcoin, and transfers between mints are settled via the Lightning Network. The system enables digital payments with minimal fees. Cashu provides libraries in Python, TypeScript, and Rust, along with mobile and command-line interface applications. The protocol is designed for integration into wallets, web paywalls, paid streaming services, and voucher or rewards systems.
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last updated 26 Jul 2026

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