Bright OLED Screen
Coldcard uses two Secure Elements, from different vendors, to protect your Bitcoin. The Coldcard (Mk4) uses Microchip’s ATECC608A and Maxim’s DS28C36B, to store the critical master secret: the 24-word seed phrase for your BIP39 wallet. These chips provide powerful security features, including complex challenges and SHA-256 responses that prevent replay and eavesdropping. An attacker cannot brute-force combinations or replay a previous login sequence, even if they fully replace the firmware in the main microprocessor
The Coldcard uses the industry-standard USB-C connector for transmitting both data and power over a single cable, ensuring compatibility and convenience
The Coldcard offers maximum security when transferring data between devices, ensuring that your Bitcoin transactions remain secure even during data transfer
Coldcard’s open-source code sets a new standard for transparency and security. Users have full visibility into the code, and they can even edit and verify it themselves. This level of control empowers individuals to take charge of their Bitcoin security with confidence. By compiling the code independently, Coldcard users ensure the integrity of their device and the safety of their valuable digital assets.
2 x Recovery Sheet