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Note to anyone planning on using Opera's client: it's terrible, out of spec, and banned on many bittorrent sites.

I don't think the complexity and user experience issues are completely intrinsic to the protocol - BitTornado (sadly, another client that misbehaves, and hasn't been updated in 6 years) was hands-down the easiest for less techy people to use and understand. (Each download has its own window and instance of the program, making it look and feel very similar to downloading in Internet Explorer)

Why do you say the difficulty is in hashing the entire file? BitTorrent divides the files into small chunks and hashes those, so downloading lots of small files vs downloading one big one doesn't make a lot of difference

(with a few caveats - some clients support an additional hash on each file, which can save you re-downloading data if two files share a block and only one is changed, and some clients add padding data so there is only one file per block. In practice, these are both very rare)

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