This article was first published on The Bit Journal.
In a recent report submitted to Congress, the U.S. Treasury Department has explained that lawful digital-asset users can use crypto privacy mixers if they want to disguise sensitive financial data from showing up on public blockchains.
The statement means a lot because crypto privacy mixers have been originally associated with illegal activity. The same agency had just previously sanctioned services such as Tornado Cash and repeatedly addressed concerns that mixers could help criminals launder stolen funds. While the new report keeps those concerns intact, it also acknowledges that crypto privacy mixers can have legitimate uses for businesses and individuals working on transparent blockchain networks.
Treasury Report Recognizes Valid Uses For Crypto Privacy Mixers
The crypto privacy mixers are not by nature unlawful tools, as the U.S. Treasury stated plainly in the recent report.
“Lawful users of digital assets may leverage mixers to enable financial privacy when transacting through public blockchains,” the department wrote.
Treasury officials said most users might prefer to keep some transactions private. Among various examples in the report, it mentions protecting details about individual wealth, business payments, charitable contributions and daily consumer spending from public blockchain records.
Previous enforcement actions described U.S. authorities crypto privacy mixers largely through the sanctions risk, ransomware payments, darknet activity and state-sponsored cybercrime lenses. This latest rewording preserves those concerns but acknowledges more formally that privacy, in and of itself, can be a legitimate use case.
The department’s analysis breaks down the services as well. Custodial mixers, which take temporary possession of users’ funds, are required to register with the Financial Crimes Enforcement Network (FinCEN) as money services businesses. If suspicious activity is identified, they can provide regulators the identities of customers and data regarding their off-chain transactions when compliant.
Before reaching its conclusion, the report reviewed more than 220 comments from industry groups, compliance specialists, analytics firms and law-enforcement agencies.
Issues With Mixers Being Used Criminally
Even while admitting its lawful uses, the Treasury reiterated that crypto privacy mixers are still involved in illegal financial activity.
For example, the report said cybercriminal groups associated with North Korea stole at least $2.8 billion worth of digital assets from Jan 2024 to Sep 2025. Many of these attacks were major incidents like the $1.5 billion hack of investment exchange, Bybit. Typically, stolen funds were passed through mixers in the course of complex laundering chains.
Data from the treasury also revealed over $1.6 billion in deposits into mixing services that have entered cross-chain bridges between May 2020 to now. Of that total, over $900 million ran through a single bridge that was later criticized for not stopping transactions related to North Korean actors.
Criminals often use mixers along with other techniques like token swaps and cross-chain transfers to break transaction trils, the department said. Still, officials stopped short of advising an outright ban on the technology. Instead, the report preaches a regulatory strategy that distinguishes compliant services from tools that operate outside of oversight.
Treasury Targets New Legal Tools to Help Crypto Investigations
In addition to its analysis of crypto privacy mixers, the Treasury urged Congress to create new legal tools that would give authorities more leverage in addressing suspicious digital-asset transactions.
One idea is to introduce a digital-asset “hold law.” This measure would enable regulated financial institutions and crypto platforms to temporarily freeze suspicious funds as investigations proceed.
Under current rules, exchanges typically also have to obtain a court order before they can block transfers. Treasury officials contended that blockchain assets move so quickly that it can be difficult to act in time to block stolen assets from flowing through different networks.
The proposed law would also create a safe harbor for firms that halt suspicious transactions during short-term investigations. According to the report, such authority may be especially useful when it comes to stablecoin transfers that settle nearly instantly on public blockchains.
The department also sought input from Congress to clarify who among participants in decentralized finance should be subject to anti-money-laundering and counter-terrorism financing obligations.
Policy Affected by Institutional Adoption and Blockchain Growth
The rapid growth in blockchain activity has also contributed to the resurgence of policy discussions surrounding crypto privacy mixers.
By early 2025, public blockchains processed approximately 3.8 billion successful transactions per month, a 96 percent annual increase, according to Treasury data cited in the report. Just at that scale, the blockchain networks are no longer used just to trade for digital tokens. They are increasingly used for commercial payments, corporate treasury transfers, charitable donations and consumer transactions.
As more companies do business on transparent ledgers, some may look for ways to keep certain financial information private without giving up compliance systems.
Institutional participation is also expanding. In between late February and early March 2026, approximately $1.7 billion surged into spot Bitcoin exchange-traded funds, according to market data; just the latest indication of how much regulated investment has flooded into the digital-asset space.
Meanwhile, research as cited by policymakers states that institutional transactions already appear to constitute large on-chain value. The Cambridge Centre for Alternative Finance reported that institutions conducted stablecoin transfers totaling approximately $1.122 trillion over two years, but only used privacy tools in just 0.013 percent of those transactions.
These numbers make it clear how early the adoption of privacy technology is compared with that of blockchain finance overall.
Conclusion
The Treasury’s new report does not relieve regulatory pressure on the crypto industry nor does it provide unrestricted approval for crypto privacy mixers. Criminal misuse of these tools remains a top area of concern for U.S. regulators.
But the department’s phrasing is a policy change. Washington has added a more open view of privacy technology on public blockchains by formally recognizing that lawful users may use crypto privacy mixers.
The new phase of U.S. digital-asset policy will probably revolve around the question of who is allowed to provide these services and under what terms. Regulated providers who maintain compliance records and cooperate with law enforcement might thus be permitted to build privacy features into blockchain payments. Tools operating outside that framework likely will continue to be scrutinized.
Glossary
Crypto privacy mixers: blockchain tools that combine or “mix” cryptocurrency transactions in a way that makes it more difficult to track the original sender and recipient.
Public blockchain: a distributed ledger characterized by transparency; enabling anyone to see transaction records that can not be easily extracted.
Custodial mixer: privacy services that take over user funds for some time in order to process transactions.
Cross-chain bridge: a protocol that allows digital assets to be transferred across multiple blockchain networks.
Frequently Asked Questions About Crypto Privacy Mixers
What does the U.S. Treasury have to do with crypto privacy mixers?
The department noted that although mixers can sometimes be used for money laundering, they can also enable honest users to protect sensitive financial information on public blockchains.
Is it legal now for the crypto privacy mixers in United States?
The report did not announce new laws, but it made clear the technology itself is not illegal per se as long as it’s used for legitimate purposes.
What is the “hold law” proposal?
Treasury’s recommendation was for a law that would permit exchanges and financial institutions to temporarily halt suspicious digital-asset transfers pending investigations into possible illicit activity by authorities.
How is financial privacy even a policy issue in crypto?
Blockchain transactions are inherently transparent. As businesses and institutions turn to public blockchains more frequently, they will likely want options to keep payment particulars and counter-parties private.
References
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