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I have read many stories about people having problems mixing coins.  What I do not understand is why people do not read the various threads on Bitcoin mixers (and people's often negative experiences with them) BEFORE mixing their BTC...

BitLaunder and Fog, for example have many negative user comments.

bitmixer.io and blockchain.info's SharedCoin have many fewer complaints.  I do prefer bitmixer.io, as their service has worked smoother for me.  That is the main reason why I chose their signature campaign, I am a happy customer.