Keep: FROST Nostr Signer1.2.0

Keep: FROST Nostr Signer lets users store a FROST key share on a phone and sign Nostr events without keeping the complete private key on one device. It serves as a dedicated signer separate from a Nostr client, reducing the exposure involved in handing event-signing duties to a general-purpose app.

Threshold setups such as 2-of-3 and 3-of-5 distribute signing authority across multiple shares. Compatible clients can request signatures through the NIP-55 Signer protocol, while NIP-46 enables remote signing through a bunker service. Users can import or export FROST shares as QR codes or text and maintain multiple accounts.

Per-application signing permissions and policies determine which apps may request signatures, with biometric and PIN authentication guarding access. The Android Keystore protects key storage, and encrypted backup and restore preserve account data; NIP-44 encryption and decryption plus SOCKS proxy support for Tor extend its privacy features. It suits Nostr users who want threshold signing and controlled requests instead of combining those responsibilities with their everyday client.

Keep: FROST Nostr Signer is open-source software in the Security & Privacy category for Android 13+ devices using the arm64-v8a architecture, and the current version is 1.2.0. Its co-signing prompt now identifies the request seeking approval and labels that name unverified when no evidence has validated it, while unavailable trusted random generation stops the operation. Legacy key shares are erased only after a copy is confirmed stored, and saved values remain tied to the key under which they were recorded.