Coldcard Firmware Bug Leads to $38 Million Bitcoin Loss

Hardware wallet maker Coinkite has confirmed a major security failure in its firmware. A technical error reduced the security entropy of certain wallets from 128 bits down to 40 bits. This weakness made it significantly easier for an attacker to guess private keys and access user funds.

The attack happened rapidly. The malicious actor managed to sweep 500 wallets in just 25 minutes. Reports indicate that an attacker used automated tools to identify the vulnerability after the company's own internal security reviews failed to catch the issue. The total loss reached $38 million in bitcoin.

This incident highlights the ongoing risks of hardware wallet security updates. While cold storage is generally considered safer than exchanges, this breach shows that code errors can still compromise private keys. Users should check if their specific device firmware is affected by the company's official security notice.

Moving forward, the industry will likely demand more transparent code auditing processes. Investors should keep a close eye on further updates from the manufacturer regarding potential recovery paths or safety protocols. Security remains a top priority for everyone holding assets on hardware devices.