The Coldcard Q is Coinkite's open-source Bitcoin hardware wallet that keeps your private keys permanently offline while letting you sign transactions with a simple tap or QR scan. Building on the original Coldcard Mk4, the Q adds a large color touchscreen, rechargeable battery, and fully air-gapped workflow so you can hold, spend, and verify without ever plugging into a computer.
Coinkite is a leader in security and hardware manufacturer, est. block 141,000. Maker of some of the most iconic Bitcoin products, such as OPENDIME, COLDCARD, BLOCKCLOCK, SATSCARD, TAPSIGNER and SATSCHIP.
An article exploring new use cases unlocked by the COLDCARD Co-Sign feature.
Buying stuff you need from Bitcoiners takes more bitcoin off the exchanges. I am always looking for more companies that accept bitcoin and wrote this article as a value 4 value advertisement for the bitcoin circular economy.
