US Treasury says crypto mixers aren’t just for criminals

Crypto mixers are not the exclusive domain of criminals, according to the US Department of the Treasury. According to a report it submitted to the US Congress, many individuals rely on these tools for legitimate privacy reasons when conducting transactions on public blockchains.

Although regulators worry about illegal activity, the Treasury’s discovery suggests that the privacy tools criminals misuse are also important to the average person who wants to control his own financial information.

Crypto mixers are services that attempt to conceal the source and the destination of cryptocurrency transactions. Blockchains like Bitcoin and Ethereum are public ledgers, and anybody can view transactions if they know the wallet address. 

People who often use cryptocurrencies for everyday payments might opt for mixers to avoid revealing personal financial data, the report noted. For example, a person sending money to a charity or paying a supplier does not necessarily want the rest of their transaction history visible on a public blockchain. 

Legally authorized users may use mixers to protect private information, such as wealth, commercial receipts, or charitable donations, the Treasury said. 

Since the records on the blockchain are permanent and publicly accessible, privacy tools can help people avoid revealing information that could expose them to fraud, theft, or unwanted attention. 

Regulators warn mixers help criminals hide funds

While considering lawful uses, the Treasury added that mixers can be abused to conceal illicit financial activities. The report cautions that some decentralized or “non-custodial” mixers are frequently tied to money laundering and other crimes. 

They have no central company operating the service, making them more difficult for authorities to regulate or investigate. 

According to the Treasury, cybercriminal organizations have used these tools to transfer stolen digital assets. Hackers affiliated with Lazarus Group — a cybercrime network reportedly tied to the government of North Korea — have used mixers in some instances to hide stolen funds during crypto exchange hacks, the agency reports. 

The agency said that so-called “custodial mixers,” which can temporarily take control of users’ funds while mixing them, could yield information that investigators can use to trace suspicious transactions. 

Since identifiable companies operate these services, regulators may be able to compel them to follow financial laws or to provide user data as appropriate. 

But decentralized mixers lack a central operator, which makes enforcement vastly more complicated.

Governments push tighter crypto oversight as privacy debate grows

The Treasury’s report comes amid growing global discussion about financial privacy related to digital assets. Starting in 2025, US lawmakers sought new regulations to expand identity verification requirements for crypto services. 

One of the proposals that has garnered the most attention for this debate is the Digital Asset Market Clarity Act of 2025 (aka CLARITY bill). Advocates say the legislation would bring clarity to the regulation of digital assets, while opponents say some provisions could compel more platforms to gather people’s personal data. 

The traditional “know-your-customer” rules that govern blockchain apps risk diminishing the decentralized and open-access features that make blockchain — in part — popular, as those in decentralized finance have noted.

Policy executive Alexander Grieve at the crypto investment firm Paradigm has previously cautioned that vague legal language may leave software developers open to liability in building privacy-focused tools.

There are worries that future government-backed digital currencies could intensify financial surveillance. So has investor Ray Dalio, who warned that central bank digital currencies would also empower regulators to monitor financial behavior more closely than existing banking systems do. 

And with new governments eager to police digital currencies, the Treasury’s study points out the privacy-versus-security conundrum. But systems or devices designed to protect the privacy of financial information can also make it more difficult to detect illegal conduct.

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