Intelligence
What is Cryptocurrency mixer?
A service that pools and reshuffles cryptocurrency from many users to break the visible link between where funds came from and where they go.
A cryptocurrency mixer, or tumbler, takes coins from many users, pools them and pays out different coins, so that following the blockchain from source to destination becomes much harder. Some are centralised services. Others are smart contracts.
Mixers have legitimate privacy uses, but they are also heavily used to launder hacking and ransomware proceeds. Several have been sanctioned or seized by authorities.