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Wu Blockchain (@WuBlockchain): Coldcard Suspected of Facing a Fourth Organized Attack Wave, Involving ~388.9 BTC Alex Thorn, Head of Research at Galaxy Research, said a fourth organized attack wave may be targeting Coldcard users. Between blocks 960,778 and 960,792, 218 transactions involving 462 victim addresses and 216 fresh destinations moved ~388.9 BTC. Activity was ~45 times higher than the pre-incident baseline, with some funds already swept to second-hop addresses. Similar transactions remain pending in the mempool, and confirmed transactions signal RBF opt-in. Users should move funds off Coldcard devices immediately and use higher fees; RBF may offer a way out for eligible transactions. Previously, Galaxy Research identified three suspected attack waves targeting Coldcard-generated addresses, affecting 4,585 addresses and draining 1,367.05 BTC worth approximately $88.6 million. Coldcard said it halted shipments and destroyed all remaining COLDCARD devices with the vulnerable firmware. Satscard, Opendime, and Tapsigner are unaffected. The patched firmware protects newly generated seeds, but users must create a new seed and move funds from any seed generated on the vulnerable firmware.