SlowMist reproduction of the COLDCARD private-key vulnerability
slowmist-2087438490518892592
- Author
- @SlowMist_Team
- Organisation
- independent
- Evidence role
- social statement
- Posted
- 12 Aug 2026, 07:18 UTC
- Capture status
- capture held
SlowMist Security Team reports reproducing the COLDCARD attack chain using Mk3 firmware 4.1.9 and estimates at least 1,719 BTC (~$111M) lost across more than 5,200 addresses. The post traces the attack to a build configuration that disabled the STM32 hardware TRNG, leaving a predictable Yasmarang software PRNG with effective entropy of roughly 40 bits on Mk2/Mk3 and 72 bits on Mk4/Mk5/Q. The figures and reproduction are SlowMist's own and are not independently verified here.
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