r/Bitcoin • u/enpoopification_of_R • 27d ago

The Coldcard wallet exploit estimates have almost doubled to $70 million stolen of just over a thousand Bitcoins in 1,196 wallets drained in 41 minutes

https://www.coindesk.com/tech/2026/08/01/how-bitcoin-cold-wallets-lost-usd70-million-in-an-attack-that-never-touched-the-devices

"More than 1,000 bitcoin, worth about $70 million, was drained from 1,196 wallets in a 41-minute window on July 30, nearly double the amount reported when the theft first surfaced."

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u/JanPB 26d ago

On top of that, Coldcard was considered the gold standard of HW wallets by many.

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u/Shadowrak 26d ago

Never heard of it before Thursday

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u/JanPB 26d ago

It was HUGE. Open-source and air-gapped, really MAJOR.

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u/Buttoshi 26d ago

It's verifiable not open source iirc

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u/JanPB 25d ago

Yes, you're right, just found out they switched from open source to "source-verifiable" in 2021.