Keep: FROST Nostr Signer
FROST threshold signer and Nostr event signer for Android
- Developer
- PrivKey LLC
- License
- MIT
- Package
io.privkey.keep- Category
- Security
- Latest version
- 1.3.2 · Oct 25, 2026
- Minimum Android
- Android 13
Screenshots
Description
Keep is a FROST (Flexible Round-Optimized Schnorr Threshold Signatures) threshold signing app and dedicated Nostr event signer for Android. It lets you hold FROST key shares on your phone and sign Nostr events without any single device ever holding the full private key.
Keep implements the NIP-55 Android Signer protocol and NIP-46 remote signing, so any compatible Nostr client can request signatures directly.
Features:
• FROST threshold signing (2-of-3, 3-of-5, etc.)
• NIP-55 Android Signer protocol
• NIP-46 remote signing (bunker service)
• Import and export FROST shares via QR code or text
• Multiple account support
• Per-app signing permissions and policies
• Biometric and PIN authentication
• Hardware-backed key storage (Android Keystore)
• NIP-44 encryption and decryption
• SOCKS proxy support (Tor)
• Encrypted backup and restore
Keep implements the NIP-55 Android Signer protocol and NIP-46 remote signing, so any compatible Nostr client can request signatures directly.
Features:
• FROST threshold signing (2-of-3, 3-of-5, etc.)
• NIP-55 Android Signer protocol
• NIP-46 remote signing (bunker service)
• Import and export FROST shares via QR code or text
• Multiple account support
• Per-app signing permissions and policies
• Biometric and PIN authentication
• Hardware-backed key storage (Android Keystore)
• NIP-44 encryption and decryption
• SOCKS proxy support (Tor)
• Encrypted backup and restore
All versions
| Version | Released | Minimum Android | Size |
|---|---|---|---|
| 1.3.2 (2 builds) | Oct 25, 2026 | Android 13 | 30.1 MB |
| 1.3.1 (2 builds) | Oct 12, 2026 | Android 13 | 28 MB |
| 1.2.0 (2 builds) | Aug 3, 2026 | Android 13 | 26.9 MB |
| 1.1.9 (2 builds) | Aug 1, 2026 | Android 13 | 26.9 MB |
| 1.1.8 (2 builds) | Jul 12, 2026 | Android 13 | 26.2 MB |
| 1.1.7 (2 builds) | Jul 11, 2026 | Android 13 | 26.1 MB |
How to install an older version of an Android app · How to install an APK file on Android
From the developer (GitHub)
APK files published by the developer on GitHub. They are signed by the developer and may not install over the other builds on this page (different signature). Links open github.com.
v1.3.2
· Oct 21, 2026
keep-android-v1.3.2-arm64-v8a.apk
27.5 MB keep-android-v1.3.2-x86_64.apk
30.1 MB v1.3.0
· Oct 8, 2026
keep-android-v1.3.0-arm64-v8a.apk
25.5 MB keep-android-v1.3.0-x86_64.apk
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