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Coldcard exploit puts Bitcoin self-custody assumptions in focus, $BTC

8/4/2026

A hardware wallet vulnerability in Coldcard has drawn commentary from Bitcoin security researcher Jameson Lopp, who says the incident reveals the practical limits of "don't trust, verify," the principle that anchors $BTC's self-custody culture.

Lopp's read is direct: a community that treats independent verification as a first principle has to confront what happens when the tools of verification carry their own vulnerabilities.

The mechanism matters more than any price reaction here. What Lopp flagged "Don't trust, verify" sits at the center of Bitcoin's security philosophy.

Hardware wallets like Coldcard exist to let users sign transactions offline, away from internet-connected systems.

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