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 1. Power on, boot Krux firmware from internal flash. 2. Enter seed via: - 24-word manual entry. - SeedQR scan. - Tinyseed (metal plate decoder). 3. 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…