These trackers differ from "general" or "semi-private" trackers (like 1337x or RARBG was) in that they are usually invite-only and enforce strict rules on organization and seeding.
A "scene release tracker" refers to a tool used to monitor and log digital media distributed by the —an underground network of piracy groups. These trackers, often called PreDBs (Pre-Databases), log the "Pre" time (the exact moment a release becomes available) and technical details like group names and file sizes. Key Tracking Tools & Sites scene release tracker