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Coldcard Bitcoin exploit explained: How a firmware bug turned entropy into a ticking time bomb

A Coldcard firmware bug from 2021 reduced Bitcoin seed entropy to as low as 40 bits, enabling attackers to drain over 594 BTC in coordinated

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Coldcard Bitcoin exploit explained: How a firmware bug turned entropy into a ticking time bomb

Coldcard firmware 4.0.1 cut Bitcoin seed entropy from 128 to 40-72 bits; attackers drained 594 BTC ($38M) from 500 wallets in July 2026. A 5-year undetected regression signals audit gaps and questions self-custody viability for institutional holdings.

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domenica 2 agosto 2026·cryptobriefing.com
Galaxy Research identifies 1,367 BTC drained in attacks on Coldcard addresses
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domenica 2 agosto 2026·zerohedge.com
"Nothing Is 100%": CZ Warns Bitcoin Holders After $89 Million Coldcard Wallet Exploit
A third wave of thefts against Bitcoin wallets built on flawed Coldcard firmware is the first one designed to be hard to follow...

Coldcard Bitcoin exploit explained: How a firmware bug turned entropy into a ticking time bomb

Confronto fonti

Coldcard Bitcoin exploit explained: How a firmware bug turned entropy into a ticking time bomb

Timeline cronologica

Galaxy Research identifies 1,367 BTC drained in attacks on Coldcard addresses

"Nothing Is 100%": CZ Warns Bitcoin Holders After $89 Million Coldcard Wallet Exploit

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