Bitcoin’s biggest move in months: 39,600 BTC shifted by small holders on July 31 — the most since FTX’s collapse — as users scrambled to secure assets amid a Coldcard wallet flaw that let attackers guess private keys. The vulnerability, rooted in a 2021 firmware error, exposed thousands of addresses, with over 1,300 BTC already stolen. Active Bitcoin addresses surged to nearly a million — the highest since late 2024 — while prices held steady, suggesting safety over selling. This wake-up call exposes critical gaps in hardware wallet security, even for certified devices, reminding the crypto world that digital asset safety remains an ongoing battle.
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