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PrivKey

Open-source infrastructure for Bitcoin, Lightning, and Nostr. Self-custodial key management, FROST threshold signing, and high-performance relays.
README.md

PrivKey

Open-source infrastructure for Bitcoin, Lightning, and Nostr. FROST threshold signing, self-custodial key management, and high-performance relays in Rust, Zig, and C. MIT licensed and self-hostable.

Keep, self-custodial key management for Nostr and Bitcoin, so no single device holds the whole key: keep (Rust), keep-android (Kotlin), keep-esp32 (C), keep-startos (TypeScript).

Libraries: libnostr-c, libnostr-z.

Tools: wisp (Nostr relay), noz (Nostr CLI), taproot-assets-rest-gateway, bosun (Bitcoin PR triage).

We upstream our fixes: Bitcoin Core, Bitcoin Knots, BDK, rust-miniscript, ZF FROST, Lightning BOLTs, negentropy. Current list at privkey.io.

Building since 2018. privkey.io · information@privkey.io · book a consultation

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  1. keep keep Public

    Self-custodial key management for Nostr and Bitcoin

    Rust 17 2

  2. wisp wisp Public

    Fast, lightweight Nostr relay with spider mode that syncs notes from people you follow.

    Zig 18

  3. libnostr-z libnostr-z Public

    Zig library for the Nostr protocol

    Zig 15

  4. libnostr-c libnostr-c Public

    Lightweight, portable C library for the Nostr protocol with native Lightning Network integration.

    C 13 1

  5. keep-android keep-android Public

    Android app for FROST threshold signing with NIP-55 support

    Kotlin 9 2

  6. shrike shrike Public

    Forked from sparrowwallet/sparrow

    Desktop Bitcoin wallet. Sparrow fork adding unified opt-in sighash support.

    Java 37 6

Repositories

Showing 10 of 84 repositories
  • keep-esp32 Public

    Air-gapped FROST threshold signing device

    privkeyio/keep-esp32's past year of commit activity
    C 5 MIT 0 15 3 Updated Oct 5, 2026
  • polar Public Forked from jamaljsr/polar

    One-click Bitcoin Lightning networks for local app development & testing

    privkeyio/polar's past year of commit activity
    TypeScript 1 MIT 196 0 0 Updated Oct 5, 2026
  • libnostr-c Public

    Lightweight, portable C library for the Nostr protocol with native Lightning Network integration.

    privkeyio/libnostr-c's past year of commit activity
    C 13 MIT 1 0 0 Updated Oct 5, 2026
  • noscrypt Public Forked from VnUgE/noscrypt

    A nostr specific cryptography library written in C

    privkeyio/noscrypt's past year of commit activity
    C 0 2 0 0 Updated Oct 5, 2026
  • fulcrum-startos Public Forked from Start9Labs/fulcrum-startos

    Fulcrum with BLAKE2b proof-of-work support, packaged for StartOS. Unofficial, not audited.

    privkeyio/fulcrum-startos's past year of commit activity
    TypeScript 2 11 0 0 Updated Oct 4, 2026
  • Fulcrum Public Forked from cculianu/Fulcrum

    Unofficial Fulcrum fork with BLAKE2b proof-of-work support for the Bitcoin hardfork. Not audited.

    privkeyio/Fulcrum's past year of commit activity
    C++ 6 139 0 1 Updated Oct 4, 2026
  • bitcoin Public Forked from bitcoinknots/bitcoin

    Bitcoin Knots enhanced Bitcoin node/wallet software

    privkeyio/bitcoin's past year of commit activity
    C++ 1 MIT 43,288 0 0 Updated Oct 5, 2026
  • keep Public

    Self-custodial key management for Nostr and Bitcoin

    privkeyio/keep's past year of commit activity
    Rust 17 MIT 2 25 2 Updated Oct 4, 2026
  • shrike Public Forked from sparrowwallet/sparrow

    Desktop Bitcoin wallet. Sparrow fork adding unified opt-in sighash support.

    privkeyio/shrike's past year of commit activity
    Java 37 Apache-2.0 357 2 0 Updated Oct 4, 2026
  • cc-firmware Public Forked from Coldcard/firmware

    Unofficial Coldcard firmware fork that signs with the unified opt-in signature hash for the Bitcoin hardfork. Not audited, not affiliated with Coinkite.

    privkeyio/cc-firmware's past year of commit activity
    Python 4 241 0 0 Updated Oct 2, 2026
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