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... which will be completely useless if they use a tumbler. It's only a matter of time before feds become skilled techies. If they currently have anyone remotely capable on their staff -- and let me remind you, they somehow managed to acquire server images of Silk Road even though it was operating as a Tor hidden service, so apparently they do -- then those technically-capable staff members will strongly advise them to tumble those coins.

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Which service will tumble 32 million worth of coins? And if they do them per bust then people will still see a transaction of x amount leaving their wallet.

Exactly, regardless if they tumble it, they still have to tumble it. Which creates plenty of technical and legal challenges. I personally doubt they would essentially launder their own seized money for future operations.

They aren't going to tumble all 32 million. Even 10k-20k USD worth of coins is enough to work with for most criminal cases.

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