libtorrent:

settings_pack
session
add_torrent_params
torrent_handle
alert
torrent_finished_alert
torrent_error_alert
alert_cast

0x41727101980


public subscribe pattern
https://en.wikipedia.org/wiki/Publish%E2%80%93subscribe_pattern


double identifiers
ID = nickname
Negative Tracker 
IRC



magnet link
.torrent file
DHT (Kademlia)
PEX
tracker
peer ID
uTP


magnet:?xt=urn:btih:716E3D502B49B128781D12F7C8B58B1770CC5DE1&dn=Doctor%20Who%201963%20Season%2022%20Complete%20x264%20%5Bi_c%5D&tr=udp%3A%2F%2F
tracker.coppersurfer.tk%3A6969%2Fannounce&tr=udp%3A%2F%2Ftracker.openbittorrent.com%3A6969%2Fannounce&tr=udp%3A%2F%2F
tracker.opentrackr.org%3A1337&tr=udp%3A%2F%2Ftracker.leechers-paradise.org%3A6969%2Fannounce&tr=udp%3A%2F%2F
tracker.dler.org%3A6969%2Fannounce&tr=udp%3A%2F%2F
opentracker.i2p.rocks%3A6969%2Fannounce&tr=udp%3A%2F%2F47.ip-51-68-199.eu%3A6969%2Fannounce



magnet:?xt=urn:btih:D540FC48EB12F2833163EED6421D449DD8F1CE1F&dn=Ubuntu%20desktop%2019.04%20(64bit)