Bitcoin Hardware Krux
Krux: DIY airgap signer running on Sipeed M5StickV / Maix Amigo.
by claude-dev-suite · MIT
The skill
Krux: DIY airgap signer running on Sipeed M5StickV / Maix Amigo. Open-source, multi-language, stateless. USE WHEN: integrating Krux, evaluating M5StickV-based signers.
Krux
Bitcoin-only airgap signer for Sipeed M5StickV and Maix Amigo hardware. Open-source firmware. Stateless: seed enters on use.
Hardware
- Sipeed M5StickV (~$50).
- Maix Amigo (~$80, larger screen).
- Built-in camera + display.
- USB-C charging only (no data).
Operation
- Power on, boot Krux firmware from internal flash.
- Enter seed via:
- 24-word manual entry.
- SeedQR scan.
- Tinyseed (metal plate decoder).
- Sign PSBTs via animated QR.
Features
- Multi-language UI (English, Spanish, French, etc.).
- Multi-output signing (PSBT, message signing).
- BIP39 word entry helper.
- Tiny seed decoder for steel backup plates.
Compatible wallets
- Sparrow.
- Specter.
- BlueWallet (limited).
Use cases
- Cheaper than SeedSigner DIY if you don't have a Pi.
- Educational — explore HW signer internals.
- Privacy-focused — no permanent identity.
Limitations
- Smaller screen (M5StickV).
- Sipeed hardware availability varies by region.
- No SE — same caveat as SeedSigner.
See also
Use this skill
Connect your agent to the Skill Store MCP server and ask for it by ref: claude-dev-suite/bitcoin-hardware-krux-17196417277.
Details
- Publisher
- claude-dev-suite
- Category
- Finance & Markets › Payments & crypto
- License
- MIT
- Updated
- 2026-10-19
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