ChipMixer

ChipMixer (chipmixer.com)

ChipMixer was a centralized cryptocurrency “mixer” (tumbler) service primarily associated with Bitcoin, designed to obscure (“mix”) the origin and destination of funds by breaking deposits into smaller units (“chips”) and recombining them in ways intended to make blockchain tracing more difficult. (apnews.com)

What it was used for

According to U.S. and European law-enforcement statements and reporting, ChipMixer was widely used to launder proceeds linked to crimes, including darknet-market transactions, ransomware, fraud, and cryptocurrency thefts. (justice.gov)

Takedown and current status

On March 15, 2023, an international operation (involving U.S. and German authorities, with Europol support) seized ChipMixer’s infrastructure and associated domains, and authorities reported the seizure of over $46 million in cryptocurrency along with servers and data. The service has been described as shut down / defunct since that action. (justice.gov)

When visited today, chipmixer.com displays a domain seizure notice rather than an operating service. (chipmixer.com)

Alleged operator

The U.S. Department of Justice announced charges against a Vietnamese national, Minh Quốc Nguyễn (of Hanoi), alleging involvement in operating ChipMixer, including money laundering and operating an unlicensed money transmitting business (among other allegations). (justice.gov)

Summary

In short, ChipMixer was a Bitcoin-mixing service that advertised transactional privacy but was alleged by authorities to function as a major money-laundering tool, and it was taken down in March 2023; the chipmixer.com domain is now seized. (justice.gov)