Galaxy Research flagged a third wave of sweeps tied to weak Coldcard-generated keys, with the attacker now targeting smaller balances and changing how funds are collected onchain. A vulnerability in a March 2021 Coldcard firmware release has enabled attackers to systematically drain bitcoin from thousands of wallets by reproducing keys generated with weak software-based randomness. Three distinct waves of attacks have now swept 1,367 bitcoin—nearly $89 million at recent prices—from 4,585 addres…
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