Coldcard crisis hits $130 million – proving 'not your keys' is meaningless if you trust a single device to generate them
Block's Bitcoin Engineering and Security team and independent Bitcoin Core developers have traced the recent batch of Coinkite Coldcard wallet losses to a specific firmware defect that exposed a hidden weakness in Bitcoin self-custody before any user touched a seed phrase. The bug diverted the device's random-number generation from its STM32 hardware source to MicroPython's software implementation, compromising the fundamental security of the wallet. This incident serves as a stark reminder that the 'not your keys, not your coins' mantra can be meaningless when users blindly trust a single device to generate their private keys. The Coldcard crisis highlights how even hardware wallets can be compromised through software vulnerabilities, undermining the very foundation of Bitcoin self-custody. As the crypto industry matures, this event underscores the critical importance of multi-layered security approaches and the dangers of over-reliance on any single component in the security stack.
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