Tracking the Theft of Over 1,000 Bitcoin from Coldcard: Identities of Initial Attackers May Have Been Obtained by the FBI
2026.08.19 10:23:49
New developments have emerged in the Coldcard hardware wallet theft incident that took place in July 2026. An investigation by Block’s Bitkey team revealed that first-round attackers used a paid account from a leading blockchain data service provider to query affected addresses. The platform’s internal logs align closely with the attack’s request volume, timing, and execution sequence, and the attacker’s identity may now be known to law enforcement. Galaxy Research previously tracked that the first-round attack transferred 1,082.65 BTC, which remains in the attacker’s addresses. Cumulative losses from the Coldcard vulnerability incident have surpassed 1,800 BTC, affecting over 5,000 addresses. The attack stemmed from a random number generation flaw in a portion of Coldcard’s firmware, which caused insufficient entropy in private keys generated by some devices, enabling attackers to crack wallets via computation. Coldcard has since released fixes and urged affected users to migrate their funds promptly.
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