http://fz67wat4363lnv2bkaiszs4ugr4bmgqasq5zsdthwqryazjlhkyddsad.onion/faq.php
First, you have to trust the mixer to keep the relationship of originating and
outgoing bitcoin addresses private. Otherwise, there is no point to mixing.
Second, even though there is no a direct blockchain link between Alice's
non-anonymous original bitcoin address and her anonymous destination bitcoin
address, data analysis of the blockchain could uncover likely connections.