Coldcard PIN Design and Operation
World Crypto Network
World Crypto Network reviews Coldcard Mark 2's PIN system documented by Clark Moody and Peter Gray, detailing dual wallets (main/secondary), duress variants, rate-limited login via Microchip ATECC508A, anti-phishing through BIP39-word confirmation from HMAC-SHA256(PIN prefix), and the brick-me PIN that irreversibly wipes the device. The architecture accepts unrecoverable loss of forgotten PINs to

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