Magnets
Unique hash of a torrent, learn more here
It will appear in the torrent client, not required
Allows to show size in the torrent client before data is aquired from the peers. Not required, may be unsupported by some clients
List of the trackers which will be used to find peers
*trackerslist - is a daily updated list of public bittorrent trackers

Result

Specify valid Info Hash to generate magnet link