A flaw in the Coldcard hardware Bitcoin wallet exposed years of BTC seed phrases after a 25-minute sweep drained substantive BTC. Per CoinDesk, a major Bitcoin wallet flaw drains $38 million worth of BTC in a 25-minute sweep (594 BTC). Per Bitcoin Magazine, the Coldcard wallet flaw exposes years of Bitcoin seeds after $70M in BTC stolen. Per Cointelegraph, the Coldcard Bitcoin loss estimate rises to $70M after a Galaxy analysis.
Which wallet is affected? Coldcard hardware Bitcoin wallet, per Bitcoin Magazine and Cointelegraph. Substantive-hardware-wallet-market position architecture.
How much was drained? Initial $38M (594 BTC) per CoinDesk; revised to $70M per Galaxy analysis per Cointelegraph; Bitcoin Magazine reports $70M.
How long was the sweep? 25 minutes per CoinDesk. Substantive-rapid-drain architecture.
What is the flaw? Substantive-seed-exposure architecture per Bitcoin Magazine's "exposes years of Bitcoin seeds" framing. Specific-vulnerability-mechanism detail has not been publicly-detailed in initial coverage.
Whose seeds are exposed? "Years of Bitcoin seeds" per Bitcoin Magazine. Substantive-multi-year-user-cohort exposure architecture.
What is Coldcard's substantive-response? Coldcard-vendor-response detail has not been publicly-released in initial coverage.
How does this fit hardware-wallet-integrity architecture? Substantive-cold-storage-security-hypothesis versus substantive-hardware-wallet-flaw architecture. Substantive-hardware-wallet-user-cohort exposure question.
What is Galaxy's role? Galaxy analysis raised the substantive-loss estimate from $38M to $70M per Cointelegraph.
How does this fit broader crypto-security architecture? Substantive-hardware-wallet-adoption architecture pairs with substantive-integrity-verification-track engagement.
What's next? Substantive-Coldcard-vendor-response track, substantive-affected-user-mitigation architecture, substantive-hardware-wallet-competitor engagement, and substantive-broader-crypto-custody dynamics will define the coming days.
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