A recent policy report submitted to Congress by the U.S. Treasury Department explicitly states that crypto mixers have legitimate privacy uses in certain circumstances.
The report states that legitimate digital asset users may utilize mixing tools to achieve financial privacy when transacting on public blockchains, such as protecting personal wealth information, corporate commercial payments, charitable donation records, and everyday spending habits from being directly disclosed. This statement appears in the U.S. Treasury Department’s assessment report on anti-money laundering technologies for digital assets, which stands in stark contrast to the narrative of the past few years, where regulators generally regarded mixers as primary money-laundering tools.
This change is not an isolated event; it is intertwined with the Tornado Cash sanctions controversy, the federal court’s critical ruling on the boundaries of sanctioning authority, and the advancement of U.S. stablecoin regulatory legislation. For the crypto industry, this means that the U.S. regulatory logic is quietly changing: the focus of discussion is gradually shifting from “whether the tool itself is legal” to “how to govern the abuse of the tool under a regulatory framework.”
Note: This article is for academic and policy research purposes only and does not constitute any investment or legal advice.
I. Tornado Cash Case: Judicial Correction of Regulatory Boundaries
The background to this policy shift can be traced back to the Tornado Cash incident in 2022.
In August 2022, the U.S. Treasury Department’s Office of Foreign Assets Control (OFAC) placed the Ethereum mixing protocol Tornado Cash on the sanctions list, citing that the protocol was used to process illegal funds, with a total value allegedly exceeding $7.00B. The U.S. government stated that a portion of these funds was related to cyberattacks by the North Korean hacking group Lazarus Group.
This action sparked widespread controversy at the legal level. Tornado Cash is not a financial institution or company in the traditional sense, but a set of open-source software and smart contract systems deployed on the Ethereum network. One of the core disputes lies in whether OFAC can regard immutable, automatically running smart contracts as “property” that can be sanctioned.
In November 2024, the U.S. Fifth Circuit Court of Appeals made a key ruling, determining that the Treasury Department had exceeded its statutory authority on this issue. The court’s core reasoning was not simply that “smart contracts are not property,” but that Tornado Cash’s immutable smart contracts do not belong to the “property” or “property interest” in which any entity has an interest, and therefore are not directly blockable by OFAC under relevant sanctions laws.
This ruling effectively tightened the legal space for the U.S. government to impose sanctions on decentralized protocols. Subsequently, in March 2025, the U.S. Treasury Department announced that it had exercised its discretion and lifted the relevant economic sanctions against Tornado Cash.
The significance of this lawsuit lies in the fact that it clarified a key principle at the federal appellate court level: at least in the case of immutable smart contracts, open-source blockchain code itself is not necessarily equivalent to a sanctionable entity or property.
II. U.S. Treasury Department Report: Mixers Are Not Just Money-Laundering Tools
In the latest report submitted to Congress, the U.S. Treasury Department gave a more complex assessment of mixing tools.
The report points out that in a public blockchain environment, transaction records are highly transparent, which means that anyone can track the flow of funds. In this environment, some legitimate users use mixing services to protect privacy, such as hiding personal asset sizes, corporate commercial payment relationships, consumer behavior, or charitable donation records.
The Treasury Department therefore acknowledges that mixing services do have legitimate uses in certain scenarios. At the same time, the report also emphasizes the risks of this technology in illegal financial activities. According to the Treasury Department’s assessment, cybercrime organizations, ransomware groups, and dark web market participants often use a combination of tools such as mixing services, cross-chain bridges, and asset swaps to obfuscate the flow of funds, thereby increasing the difficulty of law enforcement tracking.
Therefore, the U.S. regulatory thinking is undergoing a clear change: the focus is shifting from the technology itself to specific service providers and their compliance obligations.
The report points out that if a mixing service is custodial, its operating organization usually needs to register with the Financial Crimes Enforcement Network (FinCEN) as a Money Services Business (MSB) and fulfill anti-money laundering obligations, including customer identification, transaction record keeping, and suspicious transaction reporting.
In other words, the U.S. Treasury Department is trying to incorporate this technology into the existing financial regulatory framework, rather than simply treating it as an illegal tool.
III. Stablecoin Regulation and the New “Hold Law” Mechanism
This report also appears against the backdrop of the gradual advancement of the U.S. stablecoin regulatory framework.
The report was submitted to Congress to fulfill the reporting obligations set by the stablecoin legislative bill, the GENIUS Act. The bill aims to establish a federal regulatory framework for U.S. dollar stablecoins and promote the compliant application of stablecoins in the payment system.
In this policy context, the Treasury Department has proposed a new institutional recommendation: the development of a “hold law” in the digital asset space.
According to the Treasury Department’s recommendation, Congress could consider establishing a legal mechanism to provide digital asset service agencies with a legal safe harbor for temporarily and voluntarily withholding assets related to suspected illegal activities during short-term investigations. This system is similar to the suspicious transaction suspension mechanism in the traditional banking system, which can buy time for law enforcement investigations while avoiding the risk of institutions facing legal liability for temporarily freezing funds.
The report also disclosed some on-chain fund flows. For example, since May 2020, in withdrawal transactions from more than 50 cross-chain bridges, more than $37.40B were denominated in the two largest stablecoins by market capitalization. At the same time, during the same period, these cross-chain bridge services received approximately $1.60B in deposits from mixing services.
The Treasury Department believes that illegal funds are often obfuscated through a combination of tools such as mixing, cross-chain bridges, and asset swaps, rather than relying solely on one technological path.
IV. Conclusion
The mixer controversy is ostensibly a crypto technology issue, but in reality, it involves deeper institutional choices. In the traditional financial system, transaction privacy has always existed, but this privacy relies on the intermediary structure of the banking system. Blockchain, on the other hand, provides a different path, achieving privacy protection through cryptographic technology on the basis of a public ledger.
The signal released by this U.S. Treasury Department report does not mean a complete relaxation of regulation, but rather an institutional response to this reality. When regulators begin to acknowledge the legitimate uses of privacy technologies in official documents, the regulatory logic also changes accordingly. The controversy surrounding mixers may continue in the future, but the focus of discussion is gradually shifting—from whether the technology should be allowed to exist to how to govern its risks under a regulatory framework.
For a financial technology system known for its transparency, this may mean that privacy is gaining a new institutional position.
References: [1]Sinha, A. (2026, March 9). U.S. Treasury takes dramatic U-turn on crypto mixers. TheStreet. https://www.thestreet.com/crypto/markets/us-treasury-takes-dramatic-u-turn-on-crypto-mixers
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Regulatory Watershed: U.S. Treasury’s Recognition of Privacy Tech Legitimacy Reshapes Crypto Market
The U.S. Treasury Department’s recent report to Congress acknowledging legitimate privacy uses for cryptocurrency mixers marks a paradigm shift in crypto regulation that will reverberate across the entire digital asset ecosystem. This isn’t merely a policy adjustment—it’s an institutional recognition that privacy technologies have a place within the financial system, fundamentally altering the risk calculus for privacy-focused projects and reshaping market dynamics.
Market Impact: From Binary to Nuanced
For years, the crypto market operated under a binary regulatory framework for privacy technologies: either they were tolerated at the periphery or outright prohibited. The Treasury’s acknowledgment of legitimate uses—protecting personal wealth information, corporate payments, charitable donations, and everyday spending habits—introduces crucial nuance. This shift transforms privacy technologies from regulatory liabilities into potentially compliant components of the financial system.
The market’s initial reaction to such developments typically follows a pattern of relief rallies in privacy-adjacent sectors. However, experienced investors should recognize this as more than a short-term sentiment boost—it represents a structural change in regulatory approach. The Fifth Circuit Court’s limitation on Treasury’s sanctioning authority in the Tornado Cash case created legal precedent that this report now operationalizes.
Token Price Implications: Selective Opportunities Not Broad Rally
Privacy coins like Monero (XMR) and Zcash (ZEC) will likely benefit, but not uniformly. The market will increasingly differentiate between projects that demonstrate proactive compliance capabilities and those that remain purely ideological. Monero’s focus on financial privacy as an intrinsic feature positions it well, while Zcash’s optional shielded transactions may offer regulatory flexibility.
DeFi protocols incorporating privacy features face a more complex calculus. While the fundamental value proposition strengthens, the compliance overhead will increase operational costs. Projects that can balance privacy with regulatory compliance—such as those implementing optional privacy features with robust KYC/AML controls—may outperform pure privacy plays.
The most significant opportunities may lie in emerging compliance-grade privacy solutions. Protocols that can provide privacy on demand while maintaining audit trails for regulators represent a sophisticated approach that bridges the traditional finance and crypto worlds.
Risks: Compliance as a Moving Target
The regulatory landscape remains fluid. While this report represents progress, the “hold law” mechanism proposed by the Treasury introduces new compliance complexities. Projects must navigate the tension between privacy preservation and the ability to temporarily freeze assets during investigations—a fundamentally novel requirement for blockchain systems.
The $37.4B in stablecoin flows through cross-chain bridges and $1.6B from mixing services highlight the scale involved. Regulators will inevitably scrutinize these flows intensely, creating compliance risks for protocols that cannot demonstrate adequate safeguards against illicit finance.
Perhaps the greatest risk is regulatory whiplash. The crypto market has seen abrupt policy shifts before, and while this current direction appears constructive, future political or enforcement changes could reverse progress. Privacy projects must build resilience into their compliance frameworks to withstand potential regulatory headwinds.
Opportunities: The Rise of “Privacy-First” Compliance
The most sophisticated players will leverage this shift to develop “privacy-first” compliance frameworks—systems that prioritize user privacy while exceeding regulatory standards. This creates a competitive moat that ideological pure-plays cannot match.
Institutional adoption represents a significant opportunity. With clearer regulatory pathways, family offices and institutional investors may gain comfort allocating to privacy-focused assets that were previously considered too high-risk. This demographic shift could unlock substantial capital inflows.
Technological innovation will accelerate as developers build solutions that satisfy both privacy requirements and regulatory expectations. Zero-knowledge proofs, trusted execution environments, and selective disclosure mechanisms will see increased investment and refinement.
The stablecoin regulatory backdrop adds another dimension. As the GENIUS Act advances, privacy features within stablecoin ecosystems may create new compliance pathways that benefit from the Treasury’s current thinking.
Strategic Considerations for Investors
Experienced investors should approach this shift with cautious optimism. While the regulatory tailwinds are favorable, they remain subject to change. Portfolio construction should emphasize:
- Projects demonstrating clear compliance roadmaps beyond ideological positioning
- Technologies with optional privacy features that can be toggled based on regulatory requirements
- Teams with experience navigating both technical and regulatory complexities
- Solutions addressing the specific “hold law” requirements outlined in the Treasury report
The Treasury’s acknowledgment of legitimate privacy uses signals a maturing regulatory approach—one that recognizes technology neutrality and the importance of balancing privacy with legitimate regulatory concerns. For the crypto market, this represents not just a regulatory breakthrough, but an opportunity to redefine the relationship between privacy, finance, and compliance in the digital age.