torrent file contains a data structure with two top-level keys: announce, identifying the tracker(s) to use for the download, and info, containing the filenames and hashes for the torrent. This is the same value that peers (clients) use to identify torrents when communicating with trackers or other peers. Where did the first peer come from? It was fresh and there were no other torrents.Ī BitTorrent magnet link identifies a torrent using 1 a SHA-1 or truncated SHA-256 hash value known as the "infohash". In a VM, I tried a magnet link with uTorrent (which was freshly installed) and it managed to find peers. How does this work?Īlso, what is the hash of? Is it a hash of an array of all the file hashes together? Maybe it's a hash of the actual torrent file required (stripping certain information)? I have no idea how the client finds peers. So how does the BitTorrent client find the actual file? I turned on URL Snooper to see if it visits a page (using TCP) or does a lookup or the like, but nothing happened. There's no room for an IP address or anything, it's just a SHA1. I saw base32 mentioned, knowing it's 5 bits per character and 32 characters, I found it holds exactly 160bits, which is exactly the size of the SHA1. The wiki says xt means "exact topic" and is followed by the format ( btih in this case) with a SHA1 hash.
Curious about how it works, I looked up the specs and didn't find any answers.
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