Cryptohack Roundup: Authorities Shutter Cryptomixer

Also: Anthropic Warns of Autonomous AI Exploits on Blockchain Rashmi Ramesh (rashmiramesh_) • December 4, 2025

Every week, Information Security Media Group rounds up cybersecurity incidents in digital assets. This week, authorities shutter Cryptomixer, Anthropic warns about autonomous AI exploits, U.K. plans ban on crypto political donations, Do Kwon seeks leniency, Lazarus Group suspected in Upbit theft, Balancer's post-exploit plans and Yearn recovers some hacked amount.

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Swiss and German authorities with support from Europol dismantled illicit cryptocurrency mixing service Cryptomixer, seizing three servers in Switzerland. They also took control of the cryptomixer.io domain, and confiscated more than 12 terabytes of data and over 25 million euros in bitcoin. Authorities replaced the site with a seizure banner after shutting down the service.

Cryptomixer operated on both the clear web and darkweb, and was widely used by ransomware groups, darkweb ...