Bitcoin transactions are publicly logged in the "block chain" - a central feature of the Bitcoin security system. Furthermore, a Bitcoin address can be traced back to an IP address.

Bitcoin transactions are publicly logged in the "block chain" - a central feature of the Bitcoin security system. Furthermore, a Bitcoin address can be traced back to an IP address. This question on Bitcoin.Stackexchange mentions a method. Security researcher Dan Kaminski discusses how to link a Bitcoin address to an IP in Black Ops of TCP/IP 2011 (Black Hat USA 2011). Bitcoin core developer Gavin Andresen stated that,