Whoever is downvoting tumble commments is WRONG.  Go read the bitcoin forums and note the people who have stolen large amounts of bitcoins after tumbling they are gone and have never been traced.<p>Tumbling is highly effective if done properly.  You need many inputs other than just your own.  Then you take the outputs and you don&#x27;t combine them.  You can spend them via psuedo transactions with scripts, use them to store coins, tumble them some more, sell them for cash.  Since all inputs are combined there is no real way to no which outputs are from who inputted them if you&#x27;re smart, disciplined, and it&#x27;s done properly.