Security · Checklist10 Oct 20263 min read
The Coldcard seed bug: what happened, who is at risk, and a 7-step checklist
A 2021 firmware mistake made some Coldcard seeds guessable. Since 30 July 2026 attackers have taken around 1,400–2,050 BTC. What went wrong and what to do now.
#Security#Plan ₿ Forum