# Block Inc.

Type: Company (SQ)

Source: Crypto Intelligence Brief — https://getcryptobrief.com/entity/block-inc-company
Canonical HTML page: https://getcryptobrief.com/entity/block-inc-company

## Timeline

- **2026-08-03**: Public disclosure and advisory — Block’s Bitcoin Engineering and Security team releases a security advisory revealing the entropy-generating coding flaw in Coldcard. Coinkite issues a firmware update that fixes the vulnerability for new wallets but warns that existing wallets remain vulnerable.
- **2026-07-31**: Additional theft waves detected — Galaxy Research identifies two further suspicious transaction sequences, bringing total estimated losses to nearly $89 million.
- **2026-07-30**: Initial mass theft — Attackers drain over 1,000 BTC from 1,196 wallets in 41 minutes, initially valued at approximately $70 million.

## Recent coverage (1 stories)

### $89M Bitcoin heist from Coldcard wallets: 1,200 addresses drained in record time
2026-08-04 02:01:41 · Sentiment: Very Bearish · Impact: 8/10 · Sources: 3

Over $89 million in Bitcoin was stolen from 1,200+ Coldcard hardware wallets after a firmware flaw made seed phrases predictable. The attack blitz on July 30, 2026, raises urgent questions about the safety of cold storage and may trigger a sell-off among spooked self-custody users.
Full story: https://getcryptobrief.com/story/coldcard-89m-bitcoin-heist-crypto

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