A BitTorrent IP leak happens when torrent peer discovery advertises your real public IP outside the VPN tunnel. This test runs WebTorrent in the browser, gathers the IPs peers would see, and flags any address that bypasses your VPN exit.
Torrent clients connect directly to peers and trackers using UDP-based protocols such as DHT, PEX, and uTP. Many clients bind to your physical network interface rather than the VPN tunnel, so peers see your home ISP's IP instead of the VPN exit node.
This test simulates the peer-discovery step in your browser. If WebRTC reveals a public IP that differs from your VPN's address, the same leak path likely affects your torrent client too.