[2] 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.
Tumblers take a percentage transaction fee of the total coins mixed to turn a profit, typically 1–3%.
[citation needed] The existence of tumblers has made the anonymous use of darknet markets easier and the job of law enforcement harder.
"[11] In January 2021, the Department of Justice conducted an operation targeting the ransomware hacker NetWalker, successfully confiscating around $500,000 in digital assets.
Then, in February 2021, they apprehended three hackers affiliated with the North Korean military, recovering $2 million in illicitly acquired digital assets.
[15] In 2022, the tumblers Blender.io and Tornado Cash were both sanctioned by the United States Department of the Treasury, making it illegal for US citizens, residents and companies to use the service.