Coldcard hack triggers massive Bitcoin investor response
Security breach leading to movement of 210,000 BTC shakes crypto markets.
1One of 2026's largest hack incidents
The attack on Coldcard hardware wallets became the third largest crypto breach of 2026. In four attack waves starting July 30, hackers stole 1,816 BTC ($116M) from over 5,200 addresses. Galaxy Research estimates potential losses reaching 2,055 BTC ($130M). The attack stemmed from a software flaw existing since 2021 that compromised wallet security at a fundamental level.
2Long-term investors make unprecedented moves
Post-hack, Bitcoin network saw unusual activity. Glassnode data shows 210,000 BTC (~$13.5B) moved from addresses inactive for at least 155 days - the largest 'old Bitcoin' movement since December 2024. Long-term holders' controlled supply dropped from 15M to 14.7M BTC. This mass movement occurred while Bitcoin traded at $64K, 50% below its October 2025 peak.
3The price of a historic vulnerability
The breach originated from a March 2021 software compilation error that caused wallets to partially use software-based random number generation instead of hardware RNG for seed phrases. This reduced cryptographic security from 128-bit to approximately 40-bit on older devices, making private keys guessable without physical access - a critical failure for hardware wallets designed for maximum security.
4Security migration, not panic selling
Analysts emphasize this movement differs from typical market reactions. With Bitcoin trading at $64K (50% below its $100K peak), the activity represents asset relocation rather than liquidation. Historically, large movements occurred near market tops when investors took profits. This event reflects security concerns driving behavior more than market timing considerations among experienced holders.
5Tracking the hackers' movements
Lookonchain reports the hacker continues moving stolen funds, recently transferring 30.185 BTC ($1.94M) to new addresses. TRM Labs notes most stolen funds remain concentrated in a few hacker addresses, with only single deposits to Wasabi Wallet and Tornado Cash. Transaction patterns suggest possible involvement of multiple independent hackers across the four attack waves.
6Manufacturer's technical clarification
Coinkite refuted claims of a 'weak backup RNG,' explaining the issue stemmed from a standard MicroPython function included since 2018. The error emerged during software compilation and wasn't an intentional design choice. Firmware updates only protect new wallets, leaving existing seed phrases vulnerable. This clarification highlights the complex supply chain risks in crypto security hardware.
7Urgent measures for users
Experts urge all Coldcard users who generated seed phrases between March 2021 and the patch release to immediately create new wallets with fresh seed phrases. Wallets created in 2021-2026 are particularly high-risk. Temporary storage on reputable exchanges is suggested during migration. The incident underscores the importance of proactive security measures even for 'cold storage' solutions.
8Lessons for crypto security
The hack shatters the perception of hardware wallets as infallible. Security professionals recommend against single-point solutions, advocating for multisig systems and regular security audits. This event painfully reminds the crypto community that security standards require continuous evolution as attack vectors grow more sophisticated, even for the most trusted storage methods.
Original article: INCRYPTED — Coldcard hack'inden sonra Bitcoin yatırımcıları harekete geçti