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Coldcard Wallet Attacks Enter Fourth Wave, Putting 449 BTC at Risk

Coldcard Wallet Attacks Enter Fourth Wave, Putting 449 BTC at Risk

A suspected fourth wave of attacks targeting vulnerable Coldcard-generated Bitcoin wallets may already be underway, with blockchain researcher Alex Thorn warning on August 3 that almost 449 BTC had been swept from hundreds of addresses in about two and a half hours.

The latest activity, which was still unfolding as Thorn posted, follows three earlier waves that researchers have linked to the same weak-entropy vulnerability affecting certain Coldcard firmware versions.

New Sweeps Continue Thorn said his latest analysis had identified 218 transactions affecting 462 suspected victim addresses between Bitcoin blocks 960778 and 969792.

The transactions moved 388.93 BTC, valued at about $24.4 million at current rates, into 216 destination addresses, almost all of which had been just created and had no past transaction history.

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Yes, most public blockchains (like Bitcoin and Ethereum) are transparent. Transactions can be traced back to public keys and wallet addresses, meaning that while they are pseudonymous (names are not directly tied to addresses), they are not completely anonymous.

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