Hi Sami.. Naturally TV makes it look a lot easier than it really is, it would take good planning and timing to get away with something like that. A lot of things could go wrong.
It's called proxy chaining when you link proxies together, they would be more likely to use HTTP proxies which use IP:PORT, and more secure method such as SOCKS Proxies instead of a web based (PHP / CGI) proxy.
If you would chain through 12 proxies, the speed would be a lot slower.. But yeah that would make it a lot harder to trace back depending on which countries are used.If this is real could it be hard to trace really?
Say you build a proxy chain through various countries like china -> russia -> ukraine -> africa -> korea -> etc etc , that could make it a lot more difficult for our law enforcement investigators to even get access to those server logs, which they will need to trace someone back to their original IP address.
Then if you throw into the mix hacked servers being used as an open proxy, and the hacker delete's their logs afterwards to cover their tracks, an investigator would really have to get access to that server, recover the deleted information to retrieve the logs and this could slow things down a lot if you had to go through 12 unfriendly or un co-operative countries.
I think it depends mostly on how much damage and money is involved to make it worth tracking someone down in the first place. People can and have been caught.