There is not a single record of a pedophile who used Tor for CP trading ever being identified. The most secure pedos who have been pwnt,, used VPN services or SSH tunnels. I did hear of one site being traced that was behind a multi hop reverse proxy though, and really that is more anonymous than a Tor hidden service (for the server, not the clients) (Tor does a really bad job at keeping servers hidden, but a better job at keeping the people who visit them hidden). There was another CP server I read about that was just using someones open WiFI I guess the person running that site thought wireless signals cant be traced lol (actually a very very common mistake that a lot of people make in all kinds of contexts....the feds have a few years ago mastered the art of analyzing and tracing wireless signals prior to barging into random peoples homes and accusing them of all sorts of things )