Quote from: BenCousins on June 30, 2012, 10:02 amwhat about if LE brought off you to follow there coins? and is there anyway you can trace the BTC clinet wallet you have on your computer to your IP?Hi Ben,First I will answer your second question (if that makes sense!) - Yes your IP address is logged for transactions so you should run your Bitcoin client via TOR, it will take longer but is much safer. As for your first question, yes this is conceivable but a couple of things make this difficult to detect. Firstly as I explained, SR has it's own coin mixer (by all means visit blockchain.info as I outlined above and test this for yourself as I did, it's a great way better to understand how Bitcoin works). As far as I know buyer's coins are also "mixed" each time they place an order (perhaps one of our more gifted members can confirm?)Of course this works both ways too - owning "tainted" coins would probably not prove that you necessarily received them in payment for something. A notable example is listed on the Bitcoin Wiki (https://bitcointalk.org/index.php?topic=73385.0) whereby a user had received a number of BTC in payments, some of which had apparently been stolen in the great Bitcoinica Heist. He argued successfully that this in itself didn't prove anything as anyone using a mixing service could well have received said "tainted" coins - it didn't reflect on him or his customers. Of course this user was a Bitcoin trader and broker (like me!) so didn't have any reason to conceal the fact he was using Bitcoins as he could readily demonstrate his activities were legal.Secondly vendors are quite canny at ways of "cashing out" their Bitcoins without leaving a paper trail. I doubt many of them simply wire the funds to an exchange and then to their own bank account as even if it isn't possible to prove they've received the specific coins, large sums showing up in their accounts will merit further investigation.They can of course skip the bank account issue altogether and use a BTC trader to send them cash in the mail in exchange for their coins (I offer this service myself) or receive precious metals like gold bullion in the mail in exchange for BTC via Coinabul. There are also other methods to salt away your funds such that even if LEO had made the original purchase it would make it extremely difficult to detect through proxy bank accounts, forming offshore companies etc. I'd rather not go into details as it's an area of finance I only have a small experience with and also you never know who's reading!V.