Is it as easy as…lets say I find someone who got the screener on the internet of Avengers: Doomsday. I torrent from him. Once download I condec or enhance the file rename it to something like fDon_Dickle Avenger’s Doomsday and my name will be put as the uploader or however it does using qbittorrent?


I guess I was asking how do these people, make the torrent say their username? And how do peers know it comes from them?
You just name the torrent with your username when you make it. They mostly follow an agreed common format to include all the relevant information in the torrent name like: Name.Of.Movie.Year.Resolution.Source.Audio.HDR.Codec-Group
This is usually by trusting the tracker that indexes the torrent, which is usually only possible with private trackers.
PTs have scrict requirements for publishing torrents on their tracker and will tie torrents to a user on their website so that it’s impossible for other users to impersonate a group/user release name.
On public trackers, people can just lie since there’s no limits on publishing torrents and its up to the mod team to handle fake/bad torrents. Piratebay used to actually be pretty good at this with verified usernames but now I’m not so sure.
The easiest way is to join a PT which will report the same torrent hash for the same torrent on a public tracker. If it’s identical to the PT torrent, that means its from the genuine group/user.
Every torrent starts with somebody. Someone repackaged the goods, or ripped the stream, or whatever. The original uploader can call the file(s) whatever they want.