Coinkite's compact Bitcoin-only signing device, the successor to the Mk4, with a numeric keypad, a 1.54-inch Gorilla Glass screen, NFC and MicroSD-based air-gapped workflows. Firmware is published openly and the device supports PSBT and multisig.
Source: Official website — product page. Last checked 2026-09-18. Spot an error? Tell us.
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