http://e55lzoju6enqswtvm66sk3uqukcin3377ehgiorplj4d7qyssipls4yd.onion/en/faq.php
In any case, your coins are mixed with a number of other participants in the pool and after the process is completed, it is unrecognisable who owns which coins. An additional security aspect is the UniCode, which ensures that you do not join the same pool in the next CoinJoin round.