Side note: The website is no longer accessible as BestMixer was seized by authorities.
Little P.S: about this link - CLICK. Author says:
1 Chipmixer was the only centralized mixing service which I did not break fully. However, I did not put much work into checking this mixing service.
I'm not telling that Chipmixer real mixer or not, just because i don't even try bestmixer site (unfortunately). This is another topic and here it's just offtop. But my idea was that every big srvice (mixing, trading or other) have it's own issues.