Wire · market
Coldcard Hardware Wallet Flaw Linked to $70 Million Bitcoin Theft in 41 Minutes
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Fusion42 · 2 August 2026 · Fusion42 review
A firmware flaw in Coldcard Bitcoin hardware wallets allowed an attacker to drain over 1,000 Bitcoin addresses, stealing around $70.2 million in 41 minutes. The vulnerability stemmed from the use of a software pseudorandom number generator instead of the hardware random number generator during seed generation, enabling offline reproduction of wallet seeds.
This Wire brief sits within Fusion42's coverage of Fintech, and 4 sources have reported it between 2 Aug 2026 and 5 Aug 2026.
◆ ◆ The Wire takeaway
This attack exposes a critical flaw in hardware wallet security that fintech founders must treat as a live threat. You need to urgently reassess your device security and seed generation methods or risk a similar catastrophic breach.
◆ Coverage
4 sources · first reported 2 Aug 2026 · latest 5 Aug 2026
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