http://ysshlyesehcnscptskrpai4iupxccuvfcpbxk37kclbs3rsaqmolzaid.onion/links.html
China is using their "Great Firewall" for that purpose (they target Tor bridges that way for example [x] ), and you would have to be a braindead zombie to not expect all other countries as well. How would you go about to trace that, as an attacked foreigner? And that is just one of the ways to hide your identity if you are a well-funded government agency.