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About this item
Meet Coldcard, the world's most secure Bitcoin Signing Device, ingeniously designed with a full-sized numeric keypad and a bright OLED screen for effortless transaction details display. This Canadian-made device boasts a dual secure element for key storage, utilizing Microchip's ATECC608A and Maxim's DS28C36B to safeguard your 24-word seed phrase for your BIP39 wallet. It ensures a secure supply chain with a tamper-evident numbered bag and incorporates a microSD card slot for offline signing and data backup. The Mk4 version introduces a USB-C Connector, NFC Tap, and a Virtual Disk mode for easy PSBT file transfer. Uniquely, Coldcard uses a true air gap, allowing it to avoid any connection to a computer throughout its life cycle, from seed generation to transaction signing. Its fully verifiable source code offers maximum transparency and security for your Bitcoin transactions.
Unparalleled Security with Dual Secure Elements
Coldcard's security is second to none, thanks to its dual secure element for key storage. This feature employs two Secure Elements from different vendors, Microchip's ATECC608A and Maxim's DS28C36B, to protect your Bitcoin. This unique approach ensures the safe storage of your critical master secret: the 24-word seed phrase for your BIP39 wallet. With Coldcard, your Bitcoin security is always a top priority.
True Air-Gap for Ultimate Privacy
Coldcard stands out as one of the only Bitcoin signing devices that uses a true air-gap. This means it can operate without ever needing to connect to a computer throughout its entire life cycle, from seed generation to transaction signing. It uses PSBT (BIP174) natively, allowing for a level of privacy and security that's unmatched in the industry. With Coldcard, your Bitcoin transactions are as private as they can be.
Full Transparency with Verifiable Source Code
In an era where transparency is paramount, Coldcard offers fully verifiable source code. All of the code is viewable, editable, and users can compile it themselves. This feature not only ensures maximum transparency but also allows users to verify the security and integrity of the device. With Coldcard, you have the power to confirm the safety of your Bitcoin transactions.
In the Box:
Device size & weight
Size: 56 x 17.4 x 9.1 mm (2.24 x 0.69 x 0.36 in)
Weight: 16.2 g (0.57 oz)
128 x 64 px OLED
USB-C Connector (Not included)
SECURE ELEMENT CHIP
Dual Secure Element - Microchip's ATECC608A and Maxim's DS28C36B