🚨“SORRY, THIS IS THE TIME TO PANIC”: 594 $BTC SWEEP LINKED TO COLDCARD MK2/MK3 VULNERABILITY! ~594 $BTC (~$38M) was swept from ~500 single-sig addresses in under 25 minutes Thursday and consolidated into one wallet. Most held 0.15-0.26 $BTC; many UTXOs dormant for years. All single-sig. Bitcoin Core developer @theinstagibbs reproduced the flaw on a fresh Coldcard MK3 using only button presses during setup and said: “Sorry, this is the time to panic.” He confirmed the vulnerability affects MK2/MK3. Coinkite issued an official advisory: seeds generated on Mk3 firmware 4.0.1+ are at risk. Mk4 and later models are not affected. Weak entropy enabled offline key recovery.
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