Everything necessary for a private tracker to recognize and track its users' activity is already available in the UDP tracker specification (passkeys can be passed via the request string extension). I am guessing none of them have made a switch, because all the existing code is written around HTTP trackers. But in theory it's perfectly possible for them to do it and not miss on anything.
"I just remembered something that happened a long time ago."
If your needs are generic and are not into obscure/old stuff ,then with TL-IPT-FL (filelist.ro) + KAT(kickass) you are absolutely set. You probably wont be needing any other tracker including the nowadays so-called trinity of trackers "BTN-PTP-What".
And hence the word generic was mentioned earlier, for people who aren't nit picky of specific quality or specific scene/non-scene group and just need to watch the TV show/movie in decent quality. And it's not like IPT doesn't provide different encodings either, infact far from it.
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