here are the resources that were delivered via secret relay to the
   mission deployment center:
   > Example:
   >
   > [1]metrics.torproject.org - checks if the IP address was used as a
   host to send traffic to Tor.
   >
   > [2]check.torproject.org
   ([3]https://check.torproject.org/cgi-bin/TorBulkExitList.py)
   [4]github.com/SpiderLabs > - will find a list of all Tor exit nodes in
   the last 16 hours that could contact the IP;
   >
   > [5]ipqualityscore.com/user/proxy-detection-api/lookup - Find out if a
   person is using a proxy, VPN or TOR.
   [6]metrics.torporject.org really says this? hum
   ok and then we have possible exit nodes. sounds like a large set.
   proxy-detection-api doesn't sound quite like my thing.
   OK, these aren't amazing resources. I think there are a couple papers
   out there with more ideas.
   We may end up reviewing the tor source code and protocols and running
   some experiments.
   A _really_ helpful behavior when deanonymising tor users is running a
   tor node yourself. Generally if you run an exit node you can mitm them
   directly to do this.

References

   1. http://metrics.torproject.org/
   2. http://check.torproject.org/
   3. https://check.torproject.org/cgi-bin/TorBulkExitList.py
   4. http://github.com/SpiderLabs
   5. http://ipqualityscore.com/user/proxy-detection-api/lookup
   6. http://metrics.torporject.org/