Dear all,Here is what SR has to say on this topic:"...Silk Road employs a built-in tumbler that mixes all incoming bitcoins through a series of dummy transactions before they ever leave. Visit Bitcoin.org to learn more."I have been asked by several newer users now how we can be sure that SR does have a built in coin mixer as the site claims.I don't claim to be an expert on block chain analysis but I have been experimenting with sending coins from various dummy SR accounts I have set up to a couple of client wallets (I use both the QT and Electrum software) as well as a brain wallet (my head still hurts) and then typing the BTC addresses into Blockchain.info. In each case the BTC address from which the coins were received is different to that used in the SR wallet.As far as I can tell the answer to this question is therefore, yes - all coins withdrawn from an SR wallet are tumbled.I also think that while this provides a greater level of anonymity, it would not be as great as that afforded by using a mixer such as Bitcoinfog as the entire amount of Bitcoins will be moved at the same time the Bitcoins are withdrawn from your SR wallet. Bitcoinfog allows withdrawal of random amounts of Bitcoins to several addresses over a longer period of time. It's possible that I'm plain wrong and/or there's a method of analysing the block chain I've overlooked. If there's anything I've missed I'd be grateful if one of our more gifted users would set me straight.Many thanks in advance,V.