Coldcard Wallet Attacks Enter Fourth Wave, Putting 449 BTC at Risk
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On August 3 blockchain researcher Alex Thorn warned a suspected fourth wave of attacks had swept almost 449 BTC from hundreds of Coldcard-generated Bitcoin addresses in about two and a half hours. The ongoing exploit is linked to a weak-entropy vulnerability in certain Coldcard firmware versions, creating a major crypto wallet security risk and raising concerns for Bitcoin adoption and custodial trust.
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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.
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