Bitkey (Block)
Bitkey (Block) is a hardware wallet. Made by Block (Jack Dorsey's company). A 2-of-3 multisig with no seed phrase: one key on the hexagonal device (unlocked by fingerprint), one in the phone app, and one on Block's server for recovery. Any two keys sign, so Block alone cannot move your coins, and losing the phone or the device can be recovered. There is also built-in inheritance and an Emergency Exit Kit for leaving without Block's server. The 2026 model adds an OLED touchscreen. The code is published on GitHub under MIT, but the firmware can't be built from it because the fingerprint library is proprietary. Ships to many countries; check availability at checkout. Trade-off: it depends on Block's app and server for everyday convenience.
Key facts
Bitkey (Block): Bitcoin-only; closed source; not air-gapped; connects by NFC (phone app), USB-C charging. Price: $250, see the price source below.
See also
- Hardware walletA hardware wallet is a small device that keeps your private keys offline and signs transactions inside itself. Even if your computer is infected, the keys never leave the device.
- Seed phraseA seed phrase is a list of 12 or 24 ordinary words that can recreate all the keys of a wallet. Whoever has the words has the bitcoin, so write them on paper or metal and never type them into a website.
- MultisigMultisig means a payment needs several keys out of a set, for example any 2 of 3. Losing one key, or having one stolen, does not lose the coins.
- Air-gappedA device that never connects to a computer by cable or network; data moves by QR code or SD card.
References
- Bitkey (Block) bitkey.world
- price source bitkey.world