Coinkite urged Coldcard Mk3 users to migrate funds after identifying a potential seed-generation risk, as Bitcoin security experts separately examine an unexplained $38 million wallet drain.
Canadian Bitcoin hardware maker Coinkite has warned users of its Coldcard Mk3 signing device to move funds from wallets whose seed phrases were generated on affected firmware.&
On Thursday, Coinkite said seeds created on an Mk3 running firmware version 4.0.1, released in March 2021, or any later Mk3 version may put funds at risk. The issue extends through version 5.0.3, the final firmware supporting the Mk3, while the Mk4, Q and Mk5 are not affected, according to the company’s early analysis.
The warning comes as Bitcoin security specialists examine an unexplained, coordinated sweep involving 594.48 BTC from single-signature addresses. Still, no definitive public evidence has established that the Mk3 issue caused those transfers.
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