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bittorrent-codex-docs/10 Notes/BitTorrent Tracker.md

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bittorrent
Learn BitTorrent

#bittorrent

related-to Learn BitTorrent
Original BitTorrent tracker coordinates the collaboration in the Swarm. The trackers is what was making BitTorrent partly centralised - they could be many trackers, but they play the role about the seeders and clients (peers) taking part in the exchange.

With the adoption of DHT in BEP5 - DHT Protocol and BEP11 - Peer Exchange (PEX), BitTorrent becomes more decentralised and removes this static point of control: the tracker. See also: Peer Exchange protocol in Wikipedia.

A nice note about this can be found in the book The World of Peer-to-Peer (P2P):

Enabling the volatile Peer to operate also as a tracker, but even if this addressed the need for static tracker servers, there is still a centralization of the network around the content. Peers don't have any default ability to contact each other outside of that context.