By putting the infohash in the URL your site is effectively equivalent to The Pirate Bay - you're distributing links to pirated content, the only important thing in a magnet link is the infohash, the rest can be obtained via DHT.

For example:

https://iknowwhatyoudownload.com/en/torrent/?infohash=81ac3d... -> magnet:?xt=urn:btih:81ac3df677afb84211d59443fbb65f5f584cfa1a

Paste into torrent client and download. You might want to doublehash that to avoid a potential legal threat.