http://elfqv3z4iwibjdyuzk5qdwq5zqudo42uysyb73kuzpkvlqec6ivbdnqd.onion/binfo_check_anonymity.php
Verify if you are anonymous on TOR, on VPN (Virtual Private Network), or other anonymizers (anonymous proxies), and if your content blocking tools for browser tracking protection work as expected. This page shows all the information is possible to collect about the Browser, the System, the Document (and the User himself) during an Internet session.