US Treasury Backs Limited Framework for Crypto Mixers

TLDR

• The US Treasury Department acknowledged that crypto mixers serve lawful privacy and security purposes.
• The report stated that mixers can protect personal wealth, business transactions, and anonymous charitable donations.
• The Treasury cited $2.8 billion in digital asset theft by North Korean groups between 2024 and 2025.
• Officials reported that cross-chain bridges processed over $1.6 billion in mixed assets since May 2020.
• The department proposed temporary hold laws to freeze suspect assets during active investigations.

The US Treasury Department has acknowledged lawful uses for crypto mixers in a new report to Congress. The 32-page document outlines both privacy benefits and criminal risks tied to these services. Officials propose targeted legislative tools instead of broad prohibitions.

The Treasury Department submitted the report on March 5 and outlined its updated position on digital asset privacy tools. The document states that mixing services can protect personal wealth, business payments, and anonymous donations. However, it also details how criminals used these tools to launder stolen funds.

Treasury Outlines Framework for Crypto Mixers

The report states that public blockchains expose transaction histories to anyone with internet access. As a result, users seek tools that prevent public tracking of spending activity. The Treasury wrote that some mixing services address “legitimate privacy and security concerns.”

However, the department also cited criminal misuse of crypto mixers in recent years. North Korean cyber groups stole about $2.8 billion in digital assets between January 2024 and September 2025. The report states that mixers served as a primary laundering channel for those proceeds.

Cross-chain bridges processed more than $1.6 billion in mixed assets since May 2020. Authorities linked a large share of those transactions to illicit actors. Therefore, the Treasury recommended legislative “hold laws” to temporarily freeze suspect assets during investigations.

The department explained that these measures would allow authorities to pause transfers without permanent bans. Officials described the approach as a “regulatory pause button.” The framework maintains reporting requirements for compliant custodial services under FinCEN rules.

Enforcement History and Market Response

The updated stance follows prior enforcement actions against privacy protocols. In August 2022, the Office of Foreign Assets Control sanctioned Tornado Cash. Regulators targeted the protocol for facilitating unlawful transactions.

Federal prosecutors later charged Tornado Cash co-founder Roman Storm. A court convicted him in August 2025 for transmitting over $1 billion in criminal proceeds. That conviction remains in effect under federal law.

Earlier this year, authorities removed Tornado Cash from the US sanctions list. The Treasury report now provides formal reasoning for revising policy direction. Officials stated that compliant alternatives can operate within regulatory frameworks.

Market data reflects increased activity in privacy-focused assets. Privacy coins reached a combined market capitalization of $24 billion in early 2026. Monero traded at an all-time high of $790.91 and accounted for over $14 billion of that total.

Railgun reported about $800 million in total value locked across its protocol. Aztec Network surpassed $1.2 billion in total value locked by mid-2026. Ethereum traded near $2,123 in early March, according to market data.

The report states that compliant mixers must continue reporting suspicious activity to FinCEN. Lawmakers will now review the proposed hold laws for possible legislative action. The Treasury released the report as digital asset oversight remains under congressional review.

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