[zfran]

good mixers do that. They give you coins that are completely unrelated to yours

[amalcon]

Completely unrelated, in that they've never passed through the mixer? Then, what does the mixer do with the coins you've sent to it?

[zfran]

completely unrelated as in if you follow the transaction graph they haven't crossed paths, so you'd need the mixer log to break the mixing.

It's difficult to know what they do with the coins, but they could be selling them on an exchange to move onto a different currency and then buy bitcoin again.