VPN killswitches aren't always reliable. The best way to avoid exposing your IP address is by binding the VPN network interface to your torrent client. This ensures that downloads/uploads occur only while the VPN tunnel is active, reducing the chance of leaks to virtually zero.
Requirements:
A torrent client that supports network interface binding, such as:
- qBittorrent - Windows, macOS, Linux
- Tixati or BiglyBT - Android