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Coinkite reports $38M in Bitcoin drained due to Coldcard key generation flaw

Coinkite disclosed a Coldcard firmware flaw dating to 2021 that let an attacker drain 594 BTC worth $38M from nearly 500 wallets in under 30

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Coinkite reports $38M in Bitcoin drained due to Coldcard key generation flaw

Coldcard firmware bug (March 2021) reduced seed entropy to 40–72 bits; attackers drained 594 BTC (~$38M) from ~500 wallets in 30 minutes. For IT leads: multisig and offline seed generation are now baseline controls; firmware 5.6.0+ migration with fresh seeds is mandatory.

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venerdì 31 luglio 2026·cryptobriefing.com
Coinkite warns Coldcard Mk3 users of firmware flaw that may have compromised wallet seeds
Coinkite warns Coldcard Mk3 users that firmware versions 4.0.1 to 5.0.3 may have a random number generator flaw compromising wallet seeds.
venerdì 31 luglio 2026·cointelegraph.com
Coldcard Mk3 Warning Amid Unexplained 594 BTC Sweep
Bitcoin security experts said the unexplained $38 million wallet drain may involve flawed seed-generation entropy, though the cause and any Coldcard link remain unconfirmed.

Coinkite reports $38M in Bitcoin drained due to Coldcard key generation flaw

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Coinkite reports $38M in Bitcoin drained due to Coldcard key generation flaw

Timeline cronologica

Coinkite warns Coldcard Mk3 users of firmware flaw that may have compromised wallet seeds

Coldcard Mk3 Warning Amid Unexplained 594 BTC Sweep

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