U.S. Treasury Says Crypto Mixers Have Legitimate Privacy Uses

• Treasury report says crypto mixers can protect financial privacy but also enable illicit laundering.
• Lawful users employ mixers to hide wealth, payments, and spending details on public blockchains.
• Treasury proposes laws to pause suspicious crypto assets during investigations.

The U.S. Department of the Treasury has acknowledged that cryptocurrency mixing services can serve legitimate privacy purposes, even as they present challenges for regulators and law enforcement. In a report submitted to Congress under the 2025 GENIUS Act, the department said some lawful users rely on mixers to shield sensitive financial information on public blockchains.

At the same time, the report highlighted that these tools have also been used to obscure illicit transactions, including those tied to ransomware groups and North Korean cyber actors.

Treasury Recognizes Privacy Uses for Blockchain Mixers

According to the Treasury’s findings, mixers are sometimes used by individuals and businesses seeking to maintain financial privacy when transacting on public blockchains. Since blockchain transactions are publicly visible, users may employ mixing services to prevent details about their personal wealth, charitable donations, business payments, or consumer spending from being easily traced.

Mixing services operate by combining or redistributing digital asset transactions in ways that make it more difficult to identify the origin, destination, or participants involved. These systems can function through centralized platforms or decentralized mechanisms and may involve techniques such as pooling assets from multiple users, splitting transactions into smaller amounts, or restructuring transaction flows through code.

Treasury noted that some mixers are custodial services that take control of user funds during the mixing process. These custodial mixers can fall under existing regulatory frameworks and may be required to register as money services businesses, maintain records, and submit suspicious activity reports to authorities.

Illicit Finance Risks Remain a Key Concern

While acknowledging legitimate uses, the Treasury report emphasized that mixers are frequently used by criminal actors attempting to conceal the movement of illicit funds. The department cited more than $1.6 billion in deposits originating from mixing services into blockchain bridges since May 2020.

Authorities said cyber actors linked to North Korea have used mixers as part of broader laundering strategies after cryptocurrency thefts. These operations often involve swapping stolen tokens through decentralized exchanges, mixing the assets to obscure their origin, and transferring them across blockchains before converting them into stablecoins or fiat currency.

Policy Recommendations and Legislative Considerations

To address these risks, Treasury recommended several policy measures while maintaining a technology-neutral regulatory approach. Among the proposals is legislation that would allow financial institutions to temporarily pause suspicious digital assets during investigations, providing a legal safe harbor while authorities assess potential illicit activity.

The department also highlighted the importance of blockchain analytics, artificial intelligence tools, and improved information-sharing mechanisms between financial institutions and regulators to strengthen anti-money laundering and counter-terrorist financing oversight.

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