# Coldcard hack triggers $15 bn Bitcoin move to exchanges

**Published:** 2026-08-14T03:04:13.451Z  
**Topic:** Bitcoin  
**Sentiment:** neutral  
**Publisher:** TrendWatcher — https://www.trendwatcher.in/article/c2f0f3b5-0a49-43e8-8458-da62b9e78835

Coldcard vulnerability forces 39,600 BTC transfers, $15 bn in value, biggest sub‑1 BTC flow since FTX collapse – see on‑chain details.

Bitcoin users shifted roughly 39,600 BTC (about $15 bn at current prices) into centralized exchanges on Friday, the largest sub‑1 BTC daily flow since the FTX bankruptcy in November 2022, as a suspected Coldcard hardware‑wallet hack continued to unfold【1】. The surge underscores renewed concerns over self‑custody security and could reshape where large holders keep their assets.  

| At a glance | |
|---|---|
| BTC moved sub‑1 BTC daily | 39,600 BTC |
| Value of moved BTC | ≈ $15 bn |
| Comparison to prior peak | 300 BTC shy of 39,900 BTC moved after FTX collapse |
| Catalyst | Ongoing Coldcard firmware exploit exposing private keys【1】 |

## Scale of the on‑chain flow  
CryptoQuant’s head of research noted that the 39,600 BTC transferred on Friday was just 300 BTC below the record set on Nov. 16 2022, when the FTX fallout prompted a similar scramble【1】. The bulk of the flow landed on major exchanges, with Binance alone seeing its BTC reserves rise by about 9,000 BTC—from 650,000 to 659,000—over the same week【3】. This influx represents roughly 18,000 BTC added to centralized platforms in seven days, a reversal of the self‑custody trend that has dominated the past two years.  

## Hack details and losses  
Galaxy Research traced three attack waves, the latest draining an additional 207.7 BTC (≈ $13.2 m) and bringing total confirmed losses to 1,367 BTC (≈ $88.6 m) across 4,585 addresses【1】. The root cause is a pseudo‑random number generator (PRNG) flaw in Coldcard firmware dating back to March 2021, which reduced seed entropy from the expected 128 bits to about 40 bits, allowing attackers to derive private keys without user interaction【2】. The breach required no phishing, physical access, or user error, marking it the worst hardware‑wallet hack in Bitcoin history by confirmed loss amount【2】.  

## Market reaction  
Bitcoin’s price slipped 1.4 % on the day of the hack, trading around $62,250 after a volatile week that saw it dip from above $65,000【2】. 24‑hour trading volume fell to $16.9 bn, down from over $20 bn the previous day, reflecting reduced market activity amid the security scare【2】.  

## What to watch  
- **Exchange inflows**: Monitor BTC reserve changes on Binance, Coinbase, and other major platforms for further spikes that could signal continued panic withdrawals.  
- **Coldcard remediation**: Track any official firmware updates or security notices from Coinkite that address the PRNG flaw.  
- **On‑chain movement**: Watch for large, unspent attacker‑controlled addresses; a sudden outflow could precede market pressure.  

The Coldcard episode revives the debate over self‑custody versus custodial solutions, highlighting that even well‑established hardware wallets can harbor long‑standing vulnerabilities. Whether users will shift back to exchanges or await robust wallet fixes remains an open question.

## Sources
1. Cointelegraph — [Coldcard hack sparks biggest sub-1 BTC move since FTX: CryptoQuant](https://cointelegraph.com/news/coldcard-biggest-sub-1-btc-transfer-ftx-cryptoquant)
2. Coinspeaker — [$86M in Bitcoin Lost to Coldcard’s Silent PRNG Flaw Over Five Years](https://www.coinspeaker.com/coldcard-prng-vulnerability-bitcoin-hack-losses/)
3. The Currency Analytics — [Coldcard Security Breach Sparks Transfer of 39,600 Bitcoins to Central Exchanges](https://thecurrencyanalytics.com/digital-wallet/coldcard-security-breach-sparks-transfer-of-39600-bitcoins-to-central-exchanges-281726)

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Cite as: TrendWatcher, "Coldcard hack triggers $15 bn Bitcoin move to exchanges", https://www.trendwatcher.in/article/c2f0f3b5-0a49-43e8-8458-da62b9e78835