The DHS obtained the IP addresses of several suspects that visited a child porn site hosted in the Tor network. Investigators tracked all the users that accessed the links to the site to obtain the archive containing child porn material. The authorities also obtained from the file sharing service data related to the users downloads posted by members of the dark web pornography website. Three suspects have already been arrested, including three suspects that accessed a file sharing website to download child port material from a dark web website. The technique used by the law enforcement is very trivial and doesn’t rely on any exploit code to de-anonymize Tor users.”]
Source: https://securityaffairs.co/wordpress/59632/cyber-crime/dark-web-child-porn.html