Thanks for actually looking into the mentioned problems instead of going on a tangent about climate change ;) CacheP2P seems to solve the problem by including

Thanks for actually looking into the mentioned problems instead of going on a tangent about climate change ;) CacheP2P seems to solve the problem by including a list of sha1 hashes for all files that are distributed through P2P. Speculation time: I guess distributing the sha1 hashes for every wikipedia page is a bit too much (especially considering they are always changing). So with every page, you would only distribute the hash for those sites that are directly linked from it. If you provide the correct sha1 hash for every linked website (which in turn includes the hashes of all linked websites from it...), you would form some kind of merkle-tree of wikipedia pages. Except that the graph of wikipedia pages is certainly highly cyclic (thus no tree), so this isn't feasible. And all the pages change all the time. So this naive approach has already two strikes against it and does certainly not work. I will try to have a look at the source code at some later point, I guess.