The timeline provided outlines a significant security breach involving Coldcard hardware wallets, leading to the theft of approximately 85 million USD worth of Bitcoin. Here are the key events:
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July 29, 2026: Coinkite acknowledges an issue with firmware affecting Coldcard MK3 devices.
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July 30, 2026:
- A security researcher reports that a hacker is draining funds from Coldcard wallets.
- The attacker uses the compromised seed phrases to steal Bitcoin.
- Coinkite initially underestimates the extent of the breach.
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July 31, 2026:
- Coinkite admits that firmware issues affect multiple Coldcard models (MK3, MK4, MK5, and Q).
- The compromised seed phrases have reduced entropy.
- Block Engineering identifies suspicious activity from an attacker using a blockchain data provider's logs.
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August 1, 2026:
- Security researchers confirm that newer Coldcard models are also being drained.
- Galaxy Research estimates the total loss exceeds 1,367 BTC from over 4,585 addresses.
Read the full article at Protos
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Ali NematiWritten by Ali
