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A cryptocurrency mixer (also known a "tumbler") is a web-based service that is used to effectively launder digital assets by taking the data from transactions made on a blockchain and combining them in a group of other transactions of the same value. For example: if someone wanted to use a mixer to hide the fact that they received 1 bitcoin (BTC) through transactions amounting to 0.5 BTC, 0.3 BTC, and 0.2 BTC respectively, they could withdraw the sum of these transactions through a mixer, which scatters the data in a basket of similar data, making the transaction hard to track. In this hypothetical example, had the user withdrawn the 1 BTC directly to the address in her wallet, this action would cause data to be entered onto the blockchain that would enable her transactions to be traced - eventually, to her identity - as law enforcement agencies around the world have done in many cases of criminal investigation.[1]

In May 2019, the Dutch Digital Intrusion Team (DIGIT), Europol, and authorities from Luxembourg, France, and Latvia shut down a mixer called Bestmixer.io, one of the larget of such services in the world. At the time, it was believed that Bestmixer.io had performed its services on over $200 million worth of digital assets since it had been in operation.[2]