BITCOIN CORE DEVELOPER: “SORRY, THIS IS THE TIME TO PANIC” OVER COLDCARD MK2/MK3 VULNERABILITY Bitcoin Core developer instagibbs says he successfully reproduced the reported COLDCARD vulnerability on a freshly initialized MK3 device using only the number of button presses made during setup, adding: “Sorry, this is the time to panic.” He believes the issue affects MK2/MK3 devices but says he cannot yet confirm whether MK4 is vulnerable. Developer Antoine Poinsot says the key difference is that the MK4 seeds entropy with hardware random number generators and actually uses the microcontroller’s true random number generator (TRNG), while the MK3 does not. The proof-of-concept and mnemonic verification remain under review.
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