币界网报道：Cryptocurrency mixers are services that allow users to pool their coins together before sending them to a recipient address in an attempt to hide the transaction trail. Mixers usually charge between 0.5% and 7% of the transaction as service fees, making it hard to track the original sources. Bitcoin mixers work by receiving coins from different sources, tumbling them, and then sending them to different parties, making it difficult to determine who got how much and from whom. Tornado Cash is a famous mixer tied to multiple crypto hacks, including hundreds of millions for North Korea’s Lazarus Group.