[Pfiffer]

You're not far off, I think it's usually done through a mixer: https://en.wikipedia.org/wiki/Bitcoin_mixer

[asddddd]

That works, but you can also just deposit to an exchange/service, withdraw on another chain (i.e. btc -> eth) and repeat this a few times. Unless there's a large target on your back, even doing this once will effectively destroy any paper trail - especially if it's an offshore exchange that uses subpoenas for toilet paper (most of them?).