Coldcard’s Entropy Bug Reveals Hidden Vulnerability in Hardware Wallet Security
The Coldcard entropy bug exposes critical vulnerabilities in hardware wallet security. Essential insights for users.
The Coldcard hardware wallet, designed to remain offline, suffered a significant breach on July 30, 2026, when an attacker drained $89 million from 4,585 wallets. This incident underscores that hardware wallet security extends beyond the device itself to include firmware and the libraries it relies on. It highlights the need for users to recognize that self-custody involves trusting multiple layers of security, not just holding private keys.