Consider this scenario.
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On piratebay, I get a torrent for Mary's Recipes. (made-up name)
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It finishes. 4 files of a certain name, type/format, sizes and content.
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On gaytorrent, I see that JohnDoe has a torrent for that exact package of Mary's Recipes. (Same 4 files by same name, type/format, size, and probably-identical content.)
I want a way to become a seeder of JohnDoe's torrent, without having to first download his content. I want a way to link JohnDoe's torrent to my existing files, have something do a quick hash or something to verify identical content, and (if verified) proceed directly to seeding, with NOTHING added to my download stats.
How is that done?