Lines of code. 1,596 BTC gone
A full breakdown of the July 2026 COLDCARD entropy failure: the four lines that sent seed generation to a software PRNG for five years, how attackers have drained more than 1,596 BTC from about 7,300 addresses, what affected owners should do — and the four checks OneKey runs against the same failure. 16 sources.
Summary
A critical vulnerability in COLDCARD’s seed generation process led to the loss of over 1,596 BTC from thousands of addresses. This analysis details the error, its impact on users, and preventative measures that can be taken to avoid similar issues.
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