Coldcard Security Breach Triggers Widespread Anxiety Over Hardware Wallets
A recent security exploit targeting Coinkite's Coldcard hardware wallets resulted in the theft of over $38 million worth of Bitcoin (BTC). The breach occurred due to a critical code flaw in the device's custom firmware, which affected how it generated randomness using its True Random Number Generator (TRNG).
The vulnerability downgraded the security entropy from 128-bit to a guessable 40-bit level, making seed phrases vulnerable to brute-force attacks. This incident has reignited debate surrounding the long-term viability of self-custody solutions for digital assets.
Major competitors Ledger and Trezor have moved quickly to reassure users that their systems remain unaffected. Ledger stated that its devices utilize a 256-bit mathematical complexity system (entropy), making seed phrases mathematically impossible to crack through brute force. Trezor assured its user base that funds are entirely safe, highlighting that the flaw was software-based and isolated to Coinkite's proprietary firmware.