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Coldcard Firmware Bug Active Since 2021 Has Drained $89 Million in Bitcoin Across Three Attack Waves

An unidentified attacker has stolen 1,367 BTC, worth approximately $89 million, from nearly 4,600 Bitcoin addresses tied to Coldcard hardware wallets. The theft began July 30, 2026 and is described by manufacturer Coinkite as ongoing. The root cause is a firmware error introduced in March 2021 that silently disabled the device's hardware random number generator for over five years.

August 3, 2026Read →