Quote from: random0 on July 26, 2012, 12:24 pmBTC buyers are not completely anonymous even if they buy with cash in the mail. A buyer gives out at least:- the city or the post office where he sent the cash from- the amount of money he spends on SR- the frequency he buys BTC (along with how long does it take to spend his coins until he buys again.)- buyer's account name- BTC address esAll these are connected. Statistics can be made, bigger buyers filtered, traced, mapped.Anything else?I'm not sure this is particularly viable.Even I don't know the real identity of my customers who buy BTC for cash in the mail. The man who receives the envelopes shreds them (although seeing a postmark saying "Waterloo" or similar would tell you next to nothing anyway).Also the amount of purchases a buyer has made on SR is information that is available to any vendor. Indeed this is information many buyers post publicly anyway so really don't see how it could compromise their identity. It's still a far cry from counting the number of Bitcoins a person has bought using to linking it to a sale on SR.If anyone is feeling particularly paranoid about giving out their account name/wallet address I suggest you create a new account on SR just to receive your coins and then withdraw them to your main account; they will be automatically "tumbled" to throw off this kind of tracing.Having said this I do address this issue in my FAQ and my question is, "Why would they do this?" For far less trouble they could simply use existing legislation to force an already established Bitcoin exchange which accepts payment by bank transfer only (Intersango anyone?) to hand over their records? The safety of my service hinges on the fact that a buyer's identity isn't known to me, so by extension it can't even be known by LEO. This is the way it should be in my opinion!V.