Storyline
Coldcard hack leads to over $111 million stolen and major bitcoin wallet movements
In July 2026, a critical firmware vulnerability in Coldcard Mk3 hardware wallets caused a massive bitcoin theft exceeding $111 million. The exploit, stemming from a weak pseudorandom number generator used in seed generation since March 2021, allowed hackers to guess seed phrases and drain long-dormant wallets.
Published 2026-08-07 04:50 UTCUpdated 2026-08-07 18:02 UTC
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Evidence trail (top sources)
top sources (3 domains)domains are deduped. counts indicate coverage, not truth.3 top sources shown
Overview
In July 2026, a critical firmware vulnerability in Coldcard Mk3 hardware wallets caused a massive bitcoin theft exceeding $111 million. The exploit, stemming from a weak pseudorandom number generator used in seed generation since March 2021, allowed hackers to guess seed phrases and drain long-dormant wallets.
Score total
1.55
Momentum 24h
4
Posts
4
Origins
3
Source types
2
Duplicate ratio
25%
Why now
- The exploit was discovered and exploited in July 2026, causing immediate large losses.
- Recent on-chain movements confirm ongoing fallout and potential custody changes.
- July 2026 theft totals mark a significant event in crypto security for the year.
Why it matters
- Highlights critical hardware wallet security risks impacting long-term bitcoin holders.
- Demonstrates how firmware vulnerabilities can lead to large-scale crypto thefts.
- On-chain data reveals behavioral shifts in bitcoin custody following security breaches.
Continuity snapshot
- Trend status: insufficient_history.
- Continuity stage: broad_confirmed.
- Current status: open.
- 4 current source-linked posts are attached to this storyline.
All evidence
All evidence
Coldcard Bitcoin Hack: Victims Report Median Loss of 1 BTC as Theft Tops $111 Million
Bitcoin Magazine · bitcoinmagazine.com · 2026-08-07 18:02 UTC
Coldcard fallout shows up onchain as 210,000 bitcoin leaves old wallets
CoinDesk · coindesk.com · 2026-08-07 09:24 UTC
Coldcard exploit pushes July losses to $247M as second-worst month of 2026
Cointelegraph · cointelegraph.com · 2026-08-07 07:59 UTC
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Top publishers (this list)
- Bitcoin Magazine (1)
- CoinDesk (1)
- Cointelegraph (1)
Top origin domains (this list)
- bitcoinmagazine.com (1)
- coindesk.com (1)
- cointelegraph.com (1)