Can two different Bittorrent torrents share blocks which are identical? One use case is distributing a newer version of a document as an old version concatenated with a Diff. The "swarm" distributing the old document can still be used to distribute most of the blocks of the new.
If the protocol is simply, "give me the block with content-hash XYZ", then this seems possible.
The dual problem is a client upgrading to the new version of the document, needing to realize it already has most of the blocks in the old document, and can "download them from itself".
The larger goal is to distribute entire changing filesystems in a single torrent.
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