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Old February 10th, 2010
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Gnutella only supports searches by hashes via the DHT, because these cannot be routing-optimized as well as keyword seaarches (and with millions of simultaneous users these optimisations are crucial - they save about 90% bandwidth - Info:QRP ).

The DHT is a Kademlia-network (optimized for exact match retrieval) which is based on sha1 hashes (though you could just sha1 hash a tth to make it searcheable via DHT).
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