http://6wvybf7ub3xk5ow66wt7os3aovbzoo2eei6vjirvhvvkmqg4alnezzid.onion/sites/preventit/public/3-faq
The only information being stored that could potentially help with a confirmation attack to link a participant to other stored data is timestamps in the database indicating the date and time of a certain action being taken, such as when a message was sent, or an assignment was answered.