![]() The BitTorrent protocol provides no way to index torrent files. Magnet links for v2 also support a hybrid mode to ensure support for legacy clients. In addition, each file is now hashed individually, enabling files in the swarm to be deduplicated, so that if multiple torrents include the same files, but seeders are only seeding the file from some, downloaders of the other torrents can still download the file. Another update to the specification is adding a hash tree to speed up time from adding a torrent to downloading files, and to allow more granular checks for file corruption. torrent file format supports a hybrid mode where the torrents are hashed through both the new method and the old method, with the intent that the files will be shared with peers on both v1 and v2 swarms. To ensure backwards compatibility, the v2. ![]() The main reason for the update was that the old cryptographic hash function, SHA-1 is no longer considered safe from malicious attacks by the developers, and as such, v2 uses SHA-256. BitTorrent v2 is intended to work seamlessly with previous versions of the BitTorrent protocol.
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