You can not trace it backwards, that&#x27;s not how tumbling works.  If I take a 1000 inputs and combine them.  Then I split it into 100,000 outputs you can not trace that.<p>You could trace it if the person getting the outputs was dumb enough to recombine them or spend them in all the same way.  I suspect most people who tumble store the coins in those addresses and only spend small amounts later.<p>Tumbling has been used by people being tracked and has been effective at them not being caught.  Read the bitcoin forums.