https://ru.wikibooks.org/wiki/BitTorrent/DHT
https://stackoverflow.com/questions/1332107/how-does-dht-in-torrents-work

tracker
https://ru.wikipedia.org/wiki/BitTorrent-%D1%82%D1%80%D0%B5%D0%BA%D0%B5%D1%80
retracker
https://ru.wikipedia.org/wiki/%D0%A0%D0%B5%D1%82%D1%80%D0%B5%D0%BA%D0%B5%D1%80
http://pseudotracker.2g0.ru/
catalog
https://ru.wikipedia.org/wiki/%D0%9A%D0%B0%D1%82%D0%B0%D0%BB%D0%BE%D0%B3_BitTorrent
pcache
https://nsl.cs.sfu.ca/wiki/index.php/Modeling_and_Caching_of_P2P_Traffic#pCache_Software
dht
https://ru.wikipedia.org/wiki/%D0%A0%D0%B0%D1%81%D0%BF%D1%80%D0%B5%D0%B4%D0%B5%D0%BB%D1%91%D0%BD%D0%BD%D0%B0%D1%8F_%D1%85%D0%B5%D1%88-%D1%82%D0%B0%D0%B1%D0%BB%D0%B8%D1%86%D0%B0

.torrent
https://ru.wikipedia.org/wiki/.torrent
magnet
https://ru.wikipedia.org/wiki/Magnet-%D1%81%D1%81%D1%8B%D0%BB%D0%BA%D0%B0
http://wiki.depthstrike.com/index.php/P2P:Protocol:Specifications:Magnet
http://www.bittorrent.org/beps/bep_0005.html
metadata
http://bittorrent.org/beps/bep_0009.html