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What is Swarm Merging?
(lemmy.dbzer0.com)
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At least in BiglyBT, the process is automated. The match is based on exact file size; it's a crappy technique* (as the odds of a false match are rather high) and the usage case is fairly small (two identical files across different torrents), so not too commonly used.
*odds are that Vuze implemented it this way because requesting a hash would break the BitTorrent protocol, and prevent interoperability of multiple clients.