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Open-source, multi-key Bitcoin wallet with NFC/QR workflows.
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Bitcoin Keeper is an open-source, bitcoin-only mobile wallet designed for long-term self-custody. It supports single-key and multi-key (multi-sig) vaults, with advanced workflows like PSBT-based signing for air-gapped devices and QR/UR-encoded data exchange. Keeper targets seasoned users who want robust security, inheritance planning, and clean operational UX on mobile.
Download on Google Play.