The pending transactions signal replace-by-fee, so anyone who spots their address in the mempool has minutes to pay a higher fee and move funds first. A fourth wave of sweeps targeting bitcoin in Coldcard-generated addresses is underway, with researchers estimating the attacker has moved about 1,816 bitcoin, or roughly $114 million, from more than 5,200 addresses since July 30. Unlike earlier waves, the latest transactions appear to use bitcoin’s replace-by-fee feature, meaning victims who spot…
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