5 Lessons From a 13 Year Bitcoin Holder Who Lost Everything in the Coldcard Hack
- Coldcard flaw led to loss of 13 years of BTC savings in minutes for a holder.
- A weak seed generation bug enabled attackers to predict wallets and steal BTC.ย
- Atlas Phoenix BTCโs public letter outlines lessons on self-custody, trust, community, and resilience.
A longtime Bitcoin holder, Atlas Phoenix BTC, said he lost 13 years of savings in minutes after the recent Coldcard hack. His story is a reminder that self-custody gives you full control, but also full responsibility when something goes wrong.
What Happened
Coldcard is a hardware wallet made by Coinkite and has long been considered one of the safest ways to store bitcoin offline.
In late July 2026, researchers discovered a firmware bug that had existed since 2021. The bug affected how some Coldcard devices generated wallet seed phrases.
Instead of using truly random numbers, some devices created seโฆ
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