Coldcard Mk5 / Q
In plain words
Coldcard Mk5 / Q is a hardware wallet. Bitcoin-only, open source, air-gapped: it can be used without ever plugging into a computer. The Mk5 has replaced the Mk4. Update the firmware on arrival, as the maker advises.
Key facts
Coldcard Mk5 / Q: Bitcoin-only; open source; air-gapped (works without a cable to a computer); connects by microSD, NFC, QR (Q), USB-C. Price: Mk5 $219 · Q $319 (sale price, list $269 / $369), see the price source below.
Sources: see the references 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
- Coldcard Mk5 / Q coldcard.com
- price source store.coinkite.com