Coldcard Mk3 Security Warning Issued Amid $38.3M Bitcoin Transfer Anomaly

Coinkite urges Coldcard Mk3 users with specific firmware to migrate assets immediately following a $38.3M BTC transfer anomaly, though no direct vulnerability link is confirmed.

Woofun AI reports that Coinkite has issued a security advisory for Coldcard Mk3 users operating firmware versions 4.0.1 through 5.0.3, recommending immediate asset transfers. The manufacturer notes that devices using BIP-39 seed phrases, as well as Mk4, Q, and Mk5 models, appear unaffected, while investigations continue.

Security researchers are analyzing an anomalous movement of 594.48 BTC, valued at approximately $38.3 million, involving 1,324 UTXOs across 500 transactions in three blocks. AnchorWatch CEO Rob Hamilton suggests the incident may stem from insufficient random number entropy during wallet generation, though no conclusive evidence currently links the transfer to Coldcard Mk3 vulnerabilities.