Advanced users can even setup a multisig wallet between multiple cosigners, entirely on-device, and air gapped.Sign transactions for spending your Bitcoin, using PSBT files (BIP174) from any standards-compliant wallet.Backup of seed and settings, which saves an encrypted 7z file.Export lists of payment (deposit) address, using the Address Explorer.Export skeleton wallet files, for setup of Electrum or other desktop/mobile wallets.Pick your 24-seed words using our TRNG, import existing secrets, or use your dice rolls.This includes everything you need to do in the whole life of the product: It can work entirely from a USB power pack or AC power adapter. Read moreĬoldcard never needs to touch a computer.
#SPKEYGEN DOES NOT GENERATE HARDWARE FINGERPRINT CODE#
More details are available in this white paper and the complete source code is available. (Don’t worry, this counter is reset every time you login correctly.)Įven if there was some critical security bug in the secure element that completely exposed the secrets it holds, your bitcoin would still be safe, because we encrypt the contents of the secure element with a one-time pad known only to the main micro. In fact, even with the secure element removed from the system, and all the secrets of the main micro fully-known, the attacker would still only get 13 tries before the secure element bricks itself. This remains true even if they removed the chip from the board or fully-replaced the firmware in the main microprocessor. An attacker cannot brute-force combinations or replay a previous login sequence. the attacker must know the PIN to access the secrets. The secure element enforces cryptographically, that. Communication is controlled by complex challenges and SHA-256 responses which prevent replay and eavesdropping. Specifically, the Coldcard (Mk3) uses Microchip's ATECC608A to store the critical master secret: the 24-word seed phrase for your BIP32/BIP39 wallet. Instead, Coldcard uses a Secure Element to protect your Bitcoin. We find it quite scary that some Bitcoin wallets trust the main microprocessor with their most valuable secrets.
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