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A cryptocurrency mixer is a service or mechanism that makes it harder to connect cryptocurrency inputs with their eventual outputs. A privacy coin builds privacy features into the coin’s transaction design. The legal distinction is just as important: in the United States, federal Bank Secrecy Act (BSA) obligations can depend on whether someone is simply using cryptocurrency or operating a business that accepts and transmits it. Neither category is automatically illegal everywhere, and the legal outcome depends on the jurisdiction and the facts.
How cryptocurrency mixers and privacy coins differ
| Question | Cryptocurrency mixer | Privacy coin |
|---|---|---|
| Where does privacy come from? | A service or mechanism acts on transfers to make it harder to link an input with an output. | Privacy features are part of the coin’s protocol and transaction design. |
| What is being obscured? | The connection between the source of funds and the destination. The exact operation can vary by service or mechanism. | The UK government’s 2023 cryptoasset factsheet says privacy coins generally aim to hide transaction amounts and wallet addresses from public view. |
| Is it a type of cryptocurrency? | No. A mixer is a service or mechanism used with cryptocurrency. | Yes. It is a cryptoasset with privacy features. |
| Does the comparison establish which offers stronger privacy? | No. These descriptions do not provide a like-for-like technical audit or comparative anonymity measurement. Privacy features and their limitations vary. | |
The UK government’s 2023 factsheet describes privacy coins as “cryptoassets aimed at preserving their users’ anonymity.” That is a statement of purpose, not a guarantee that every transaction is untraceable or that every privacy coin conceals the same information in the same way.
Key legal difference: using a tool versus operating a business
For U.S. federal BSA purposes, the relevant question is not simply whether a transaction involves a mixer or a privacy coin. FinCEN’s 2013 guidance distinguishes an individual user from a business administrator or exchanger that accepts and transmits convertible virtual currency. The roles are not interchangeable, and the facts and circumstances matter.
Individual users
FinCEN’s 2013 guidance says a person is not a money services business (MSB) merely for using convertible virtual currency to buy goods or services, or for making certain transfers on the person’s own behalf. That limited point does not decide whether other federal or state laws apply to a particular activity.
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Administrators and exchangers
Under the same guidance, an administrator or exchanger that accepts and transmits value may qualify as a money transmitter, depending on its activities and any applicable limitation or exemption. A person’s label for a service does not settle the issue: the activity and business model matter.
Providers dealing in privacy-oriented assets
In prepared remarks on August 12, 2019, FinCEN Director Kenneth A. Blanco said that a money transmitter offering bitcoin, ether, or “anonymizing-enhanced cryptocurrencies” (AECs) has the same BSA obligations. He named Monero, Zcash, Grin, and Dash. FinCEN also said providers should understand and mitigate the risks of the assets they offer and meet applicable reporting and recordkeeping requirements. This describes obligations for regulated providers; it is not a blanket finding that ordinary possession or use of a privacy coin is unlawful.
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What U.S. legal developments show—and do not show
U.S. actions involving mixers illustrate why it is important to distinguish a service, its alleged operators, and individual users. The examples below concern specific government actions and allegations; they do not establish a universal rule for every mixer, privacy protocol, or user.
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|---|---|---|
| October 2023 | In a proposed-rule notice, FinCEN described convertible virtual currency mixing as presenting money-laundering risks. It also acknowledged possible legitimate privacy uses, including for people living under repressive regimes or conducting lawful transactions anonymously. | The notice recognized both risks and potential legitimate uses. A proposed rule is not, by itself, a final rule. |
| October 2023 | The same notice cited third-party estimates that 24% of the $7.8 billion sent to mixers in 2022 was illicit, compared with 10% of the $11.5 billion sent in 2021. | These are estimates cited by FinCEN in a proposed-rule notice, not FinCEN’s independent measurements or current estimates. |
| February 2025 | In an update concerning Blender.io and Sinbad.io, the Department of Justice described them as fee-based mixers designed to hide cryptocurrency sources. DOJ reported that OFAC had sanctioned both services and that Sinbad was taken down in November 2023. The update accompanied charges against alleged operators. | Charges are allegations, not convictions. The action concerns the named services and defendants, not every mixer or user. |
| March 21, 2025 | The Treasury Department’s Office of Foreign Assets Control (OFAC) removed Tornado Cash from the Specially Designated Nationals and Blocked Persons (SDN) List. | That dated delisting action does not, by itself, resolve criminal, money-transmission, or other legal questions. |
| August 6, 2025 | DOJ announced that a jury found Roman Storm guilty of conspiring to operate an unlicensed money transmitting business related to Tornado Cash. | The announcement concerns a specific defendant and count. It is not a ruling that all mixers or privacy technologies are illegal. |
The cited August 2025 announcement does not establish a later sentencing or appellate outcome. For a current assessment of a specific case or service, check the latest court and government records rather than treating the dated actions above as a complete statement of its present status.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to assess a mixer or privacy coin in your jurisdiction
These sources establish U.S. federal BSA guidance and selected U.S. enforcement and sanctions developments, plus a UK government definition of privacy coins. They do not establish the rules for individual use in every country, or every exchange’s policies. For a particular activity, separate the following questions:
Quick Recap
- Where are you and the service? Identify the relevant country and, where applicable, state or territory. U.S. federal BSA guidance is not a substitute for local law elsewhere, and FinCEN says its 2013 guidance does not decide compliance with other federal or state laws.
- Are you using a coin, using a service, or operating one? An individual’s use, a business that exchanges or transmits value, and a service’s administration are different activities. Do not assume that a legal conclusion about an operator applies to every user.
- What does the service actually do? A mixer is intended to make source-to-destination links harder to establish. The label alone does not establish its design, the information it retains, or the legal classification of its operator.
- What do local providers permit? Exchange or wallet policies can affect whether you can deposit, withdraw, or trade an asset, but a provider’s policy is not the same thing as a legal ruling.
- Is the legal information current? Proposed rules, sanctions-list changes, charges, verdicts, sentencing, and appeals are distinct developments. Check the latest official material for the jurisdiction and conduct at issue.
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