Coldcard Hardware Wallet Flaw Linked to $70 Million Bitcoin Theft in 41 Minutes

An attacker drained 1,196 Bitcoin addresses in 41 minutes on July 30, taking 1,082.65 BTC worth about $70.2 million at the time. Galaxy Research mapped the sweep and tied it to a firmware flaw in Coldcard, the Bitcoin-only hardware wallet made by Canadian firm Coinkite.

A March 2021 firmware integration error routed seed generation to a deterministic software pseudorandom number generator (PRNG

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id: 2347
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insdate: 2026-08-01 18:10:05
title: Coldcard Hardware Wallet Flaw Linked to $70 Million Bitcoin Theft in 41 Minutes
additional: An attacker drained 1,196 Bitcoin addresses in 41 minutes on July 30, taking 1,082.65 BTC worth about $70.2 million at the time. Galaxy Research mapped the sweep and tied it to a firmware flaw in Coldcard, the Bitcoin-only hardware wallet made by Canadian firm Coinkite.

A March 2021 firmware integration error routed seed generation to a deterministic software pseudorandom number generator (PRNG
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