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Coldcard hack drives biggest sub-1 BTC exodus since FTX, CryptoQuant data shows

8/2/2026

A Coldcard hardware wallet hack set off a $BTC transfer event that CryptoQuant researchers ranked as the largest sub-1 BTC movement since the FTX collapse.

Some 39,600 BTC shifted out of small wallets as the exploit was still running. Researchers warned the attack had not been contained. What the on-chain data shows The 39,600 BTC figure is the signal worth reading.

Sub-1 BTC transactions are the signature of retail holders and small self-custody users, not institutions moving blocks.

When that cohort moves in volume, it typically signals a threat they believe is credible and immediate.

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