Quote from: cazkooo on June 30, 2015, 03:07:11 PM

Quote from: Quickseller on June 30, 2015, 03:00:18 PM

Quote from: cazkooo on June 30, 2015, 02:46:04 PM

Quote from: Quickseller on June 30, 2015, 12:46:23 PM

He probably used mixers and coinjoin transactions which are going to require advanced software

Does this mean that even a coin is mixed then it still can be track? Back in the day, I know that many people use bitcoin gambling website such as primedice and justdice to launder because there are so many incoming deposit and withdrawals there and your coins will never be trackable. He could be using bitmixer and I never heard someone track a coin after it is mix by bitmixer

If someone used a gambling site to mix the coins then someone would simply need to ask the operator of the gambling site to find out where the money went. In many cases the owner would likely be willing to give up that information because that is not what their site was designed to do.

For a mixer like bitmixer or bitcoinfog, their service is specifically designed to allow people to have privacy and if they are true to their word, will not reveal where a certain customer's money was sent to.

It is possible to track funds through a mixer. All you would have to do is know which txid that funds were sent to the mixer, the fee the mixer charges then look at all the transactions that were sent by the mixer over the next 12 hours (for bitmixer) that add up to the total amount mixed (minus the fee). For smaller amounts there will be a large number of possible outputs that belong to a certain customer, however when you have 2,000+ BTC total output, the total number of transactions is much smaller. The difficult part is trying to figure out which transactions belong to which mixers as if they do a good job their various addresses will not be spend linked together.

That is a lot of work to do and I checked the transaction and I see that it is going through a lot of addresses. I have never used bitmixer before but I read it that they can mix your btc in one piece and from the transaction from the thief the btc is send to a lot of address by splitting them into a lot of smaller pieces. Does this mean the thief use multiple address of a mixing company?

In order to increase privacy, you should have the mixer withdraw to multiple addresses in order to make it more difficult to track your money, however like I said before, if someone knows all the addresses that belong to the mixer then if you know that someone mixed exactly 2,235.5326 (for example), that bitmixer charges exactly 0.5% of the amount mixed plus .0005 BTC per output address then you would need to look at all the outputs of bitmixer over the next 12 hours that add up to 2,224.354937 BTC (99.5% of 2,235.5326 while adding .0005 to each output in order to figure out where that person's money ended up.