Roman Sterlingov, a Russian-Swedish national, has been sentenced to 12.5 years in prison for operating Bitcoin Fog, a crypto mixer, from 2011 to 2021. This sentence comes after Sterlingov was found guilty of laundering approximately $400 million through Bitcoin Fog. Crypto mixers are tools designed to obfuscate the origin and destination of cryptocurrency transactions, making it difficult to track the flow of funds and often used for illicit activities. This case highlights the ongoing efforts to combat money laundering and criminal activities within the cryptocurrency space.