A five-year-old firmware build error in Coldcard hardware wallets turned one of Bitcoin’s most trusted self-custody tools into the largest hardware wallet exploit on record. Starting July 30, 2026, attackers exploited weak entropy in seed generation—routing through a software PRNG instead of the intended hardware RNG—draining roughly 1,600–2,000 BTC (estimates ranging $116–130 million) across thousands of addresses in successive waves. No physical access, no phishing, no social engineering. Just math against predictable keys.
The on-chain response was immediate and massive. CryptoQuant data shows small-holder transfers (sub-1 BTC) hit 39.6K BTC on July 31—nearly identical to the 39.9K BTC moved in the days after FTX’s collapse in November 2022. Daily active addresses jumped from ~645K to nearly 1 million, the highest since December 2024, driven almost entirely by sending addresses. Long-term holder spending by non-exchange wallets surged to a 30-day sum of 406K BTC by early August, the highest since mid-January. Exchange reserves rose by about 17.5K BTC in the following days, with Binance absorbing roughly 51% of the net increase (~9K BTC)…
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