Cryptocurrency Mixing
Digital shadows hide the trail of cartel cash in the Ozarks.
A cryptocurrency tumbler or cryptocurrency mixing service is a service that mixes potentially identifiable or "tainted" cryptocurrency funds with others, so as to obscure the trail back to the fund's original source. This is usually done by pooling together source funds from multiple inputs for a large and random period of time, and then spitting them back out to destination addresses. As all the funds are lumped together and then distributed at random times, it is very difficult to trace exact coins. Tumblers have arisen to improve the anonymity of cryptocurrencies, usually bitcoin (hence bitcoin mixer), since the digital currencies provide a public ledger of all transactions. Due to its goal of anonymity, tumblers have been used to money launder cryptocurrency.
Quick Facts
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Lore & Background
It provides factual information about real-world cryptocurrency tumblers. Tumblers take a percentage transaction fee of the total coins mixed to turn a profit, typically 1–3%. Mixing helps protect privacy and can also be used for money laundering by mixing illegally obtained funds. Mixing large amounts of money may be illegal, being in violation of anti-structuring laws. Financial crimes author Jeffrey Robinson has suggested tumblers should be criminalized due to their potential use in illegal activities, specifically funding terrorism; however, a report from the CTC suggests such use in terrorism-related activities is "relatively limited". There has been at least one incident where an exchange has blacklisted "tainted" deposits descending from stolen bitcoins. The existence of tumblers has made the anonymous use of darknet markets easier and the job of law enforcement harder.
Reader's Guide
Peer-to-peer tumblers act as a place of meeting for bitcoin users, instead of taking bitcoins for mixing. Users arrange mixing by themselves. This model solves the problem of stealing, as there is no middleman. When it is completely formed, the exchange of bitcoins between the participants begins. Apart from mixing server, none of the participants can know the connection between the incoming and outgoing addresses of coins.
Did You Know?
- In December 2013, Bitcoin Fog was used to launder part of 96,000 BTC from the Sheep Marketplace robbery.
- Roman Sterlingov, founder of Bitcoin Fog, was sentenced to 150 months in prison in November 2024.
- In 2022, the U.S. Treasury sanctioned both Blender.io and Tornado Cash, making their use illegal for U.S. citizens.
- In late November 2025, German and Swiss authorities seized servers of cryptomixer.io and confiscated 25 million Euro in crypto.
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