https://en.wikipedia.org/wiki/Global_surveillance#Infiltrati...
Edit: And that from netzpolitik (highly trusted german source) under 'A global passive adversary' that's the interesting part: https://netzpolitik.org/2017/secret-documents-reveal-german-...
There is also I2P network, which is even harder to break (unless someone owns practically all nodes there).
And no you can trace it thru the ISP's, the problem is the latency, Connection from here to there in that millisecond trace one...and so on.
Edit: GnuNet, RetroShare and ZeroNet should also be mentioned