Quote from: bitmover on May 29, 2020, 08:04:57 PM

It is possible to track, but it is difficult.
It depends on this secret service capabilities.

Not only is it possible but it has already happened, most mixing services can be tracked. read this Breaking Mixing Services
The only exception is Chipmixer, but you need to trust them, and it is probably best not to trust absolutely any service.
The rest of the mixing methods are either expensive or it is easier to know that the mixing was done through them and therefore it is better to avoid them.