This utility app registers the magnet: URL scheme on an iOS device, quickly parses the link and offers to launch a Siri Shortcut called Open Magnet Link with the magnet link as input.
iOS Safari does not make it easy to copy links using schemes it does not recognize. As such, copying magnet: links and pasting them was cumbersome if not sometimes impossible. This app was built as a way to handle those links. Typically, the shortcut I'm using connects to a server using SSH and sends the magnet link to a Transmission process using transmission-remote.
The code is public domain.
Magneto Helmet by Joe Van Wetering