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COLDCARD Wallet RNG Flaw Likely Linked to $88 Million Bitcoin Theft

Researchers estimate 1,000 to 1,300 BTC were drained after a firmware flaw let some wallets generate predictable seed phrases.

Summary by BleepingComputer
A vulnerability in COLDCARD hardware wallet firmware allowed attackers to steal an estimated $88.6 million in Bitcoin from thousands of wallets whose seeds were generated using a flawed random number generator.
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It has been revealed that three waves of attacks exploited a vulnerability in the firmware of the Bitcoin hardware wallet "COLDCARD" since July 30, 2026, resulting in the theft of an estimated $88.6 million (approximately 14 billion yen) worth of Bitcoin. Read more...

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bitcoin.fr broke the news on Saturday, August 1, 2026.
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