What Is a Bitcoin Mixer and How Does It Work? The Legal Status in 2026

Update 25 September 2026: This explainer first appeared in January 2020 and has been rewritten. The original presented a specific mixing service; we removed that part. Since 2022, US authorities have sanctioned several mixers, courts have ruled on Tornado Cash and Samourai Wallet, and the EU has adopted rules that bar crypto service providers from offering anonymising accounts from July 2027. This version explains how mixers work and where the law stands today.

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A Bitcoin mixer, also called a tumbler, is a service or protocol that pools bitcoin from many users and pays out the same amounts, minus a fee, to new addresses. The aim is to break the visible link between the address that sends coins and the address that later receives them. Using a mixer is not a crime in itself in most countries, but using one to hide the origin of criminal proceeds is money laundering everywhere, and regulated exchanges treat mixed coins as a risk.

Why is Bitcoin not anonymous?

Bitcoin is pseudonymous, not anonymous. Every transaction is recorded on a public blockchain, where anyone can follow coins from address to address. The addresses carry no names, but as soon as one of them is linked to a person, for example through an exchange account with identity checks, much of that person's transaction history can become visible. Blockchain analytics firms specialise in this kind of tracing, and law enforcement agencies use their tools. How a blockchain records transactions is explained in our guide What is blockchain?

How does a Bitcoin mixer work?

The first version of this article compared mixing to a smoothie: once the fruit has gone through the blender, nobody can say which piece produced which flavour. Mixers try to do the same with coins. There are three basic designs:

• Custodial mixers take users' coins into their own wallets and later pay out different coins, often with a delay. Users have to trust the operator, who controls the funds and can keep records.
• CoinJoin combines payments from several users into one joint transaction with many inputs and outputs of equal size, so an outside observer cannot easily tell which output belongs to which input. No single party holds the coins.
• Smart-contract mixers such as Tornado Cash on Ethereum let users deposit a fixed amount into a pool and later withdraw it to a new address with a cryptographic proof that does not reveal which deposit it belongs to.

None of these designs guarantees anonymity. Analytics firms combine timing, amounts and address clustering to link transactions, and investigators have repeatedly traced funds that went through mixers.

Why do people use mixers?

There are legitimate reasons to want financial privacy. A public blockchain can reveal salaries, business relationships, donations or the size of someone's savings to anyone who knows an address, and privacy advocates argue that this exposure is a security risk in itself. At the same time, mixers have been used on a large scale to launder stolen funds. When the US Treasury sanctioned Tornado Cash in August 2022, it said the service had been used to launder more than $7 billion since 2019, including over $455 million stolen by the North Korean Lazarus Group. This dual use is why the legal debate is so heated.

Is using a Bitcoin mixer legal?

In the US and in EU member states, there is no general ban on individuals using a mixer. What is illegal everywhere is hiding the proceeds of crime, which counts as money laundering regardless of the technique. Operators face stricter rules: in the US, a business that accepts and transmits other people's funds must be registered and licensed as a money transmitter, and running one without that is a federal crime. In practice, users should also expect regulated exchanges to freeze or reject deposits that come directly from a mixer and to ask where the funds came from.

How have US authorities acted against mixers?

US authorities have acted against several services. The Treasury's Office of Foreign Assets Control (OFAC) sanctioned Blender.io in May 2022 and its successor Sinbad in November 2023. US and German authorities took down ChipMixer in March 2023. Roman Sterlingov, the operator of Bitcoin Fog, was sentenced to 12 and a half years in prison in November 2024.

Tornado Cash: sanctions, court ruling and delisting

OFAC placed Tornado Cash on its sanctions list on 8 August 2022. Several users sued, and on 26 November 2024 the US Court of Appeals for the Fifth Circuit ruled in Van Loon v. Department of the Treasury that Tornado Cash's immutable smart contracts are not "property" that can be sanctioned under the law OFAC had relied on. On 21 March 2025, the Treasury removed Tornado Cash from the sanctions list. Co-founder Roman Semenov remains listed under the North Korea sanctions program. We covered the court ruling in January 2025 in Tornado Cash OFAC sanctions overturned.

The criminal cases continue. In New York, a jury found co-founder Roman Storm guilty on 6 August 2025 of conspiring to operate an unlicensed money transmitting business and could not reach a verdict on the money laundering and sanctions charges. Prosecutors want to retry those two counts, and the retrial is scheduled for April 2027; Storm's motion for acquittal has not yet been decided. In the Netherlands, a court in 's-Hertogenbosch sentenced developer Alexey Pertsev to 64 months in prison for money laundering on 14 May 2024. He appealed and has been out of detention under electronic monitoring since February 2025 while the appeal is pending.

Samourai Wallet: guilty pleas and prison sentences

US prosecutors charged the founders of Samourai Wallet, a Bitcoin wallet with built-in mixing features, in April 2024. Keonne Rodriguez and William Lonergan Hill pleaded guilty in July 2025 to conspiring to operate an unlicensed money transmitting business. In November 2025, Rodriguez was sentenced to five years and Hill to four years in prison, according to the US Attorney's Office for the Southern District of New York. Prosecutors said the service had processed more than $237 million in criminal proceeds. In December 2025, President Donald Trump said he would look at a pardon for Rodriguez; no pardon has been granted so far.

What changed in US enforcement policy?

On 7 April 2025, Deputy Attorney General Todd Blanche told federal prosecutors in a memo on digital assets that the Justice Department would no longer target "mixing and tumbling services" for the acts of their end users or for unwitting violations of regulations. Cases involving fraud, terrorism, cartels, hacking and similar crimes remain a priority, and the memo did not end the Storm or Samourai prosecutions. A rule that FinCEN proposed in October 2023, which would require US financial institutions to report transactions involving foreign mixers, has not been finalised; the federal regulatory agenda lists it as a long-term action.

The EU: anonymising accounts banned for crypto providers from July 2027

In the EU, the new Anti-Money Laundering Regulation, Regulation (EU) 2024/1624, applies from 10 July 2027. Its Article 79 prohibits banks, financial institutions and crypto-asset service providers from keeping anonymous crypto-asset accounts or any account that allows the anonymisation or increased obfuscation of transactions, including through anonymity-enhancing coins. The rule addresses providers, not individuals: holding coins in a private wallet remains legal. Since 30 December 2024, the EU Transfer of Funds Regulation has also required crypto providers to collect and pass on sender and recipient information for the transfers they carry out. What the ban means for Monero, Zcash and other privacy coins is analysed in Privacy Coins and EU Anti-Money-Laundering Law.

Conclusion

A Bitcoin mixer is a privacy tool with a heavy legal shadow. The US has eased its stance on sanctions and on prosecuting services for the acts of their users, yet the developers behind Tornado Cash and Samourai Wallet have been convicted, and in the EU crypto providers will have to shut out anonymising services from July 2027. Anyone who values privacy on Bitcoin should know that exchanges can refuse mixed coins and that mixing never makes money of criminal origin legal. For the market outlook, see our Bitcoin price prediction.

FAQ

What is a Bitcoin mixer?

A Bitcoin mixer, or tumbler, pools coins from many users and pays them out to new addresses so that the link between sender and receiver is hard to trace on the blockchain.

Is it illegal to use a Bitcoin mixer?

In the US and the EU, using a mixer is not banned for individuals. Hiding criminal proceeds is money laundering, and operators of mixing services face licensing duties, sanctions and prosecution.

Is Tornado Cash still sanctioned?

No. The US Treasury removed Tornado Cash from the sanctions list on 21 March 2025, after the Fifth Circuit ruling of 26 November 2024. Co-founder Roman Semenov remains sanctioned.

What happened to Samourai Wallet?

Its founders pleaded guilty in July 2025 to conspiring to operate an unlicensed money transmitting business and were sentenced in November 2025 to five and four years in prison.

Will the EU ban crypto mixers?

From 10 July 2027, Article 79 of the EU Anti-Money Laundering Regulation bars crypto-asset service providers from keeping accounts that allow transactions to be anonymised, including through anonymity-enhancing coins. Private wallets are not covered.

Can mixed bitcoin be traced?

Often, yes. Analytics firms link transactions through timing, amounts and address patterns, and investigators have traced funds through several mixers.