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Hence, why do we connect to IP addresses, rather than connecting to public key hashes? Granted, public key hashes are not routable, but there could be a service to provide the mapping from hashes to addresses [...]

As I understand it, this is already an issue with the IP protocol. Here's a Google Tech Talk from 2007 discussing the issue with having both the unique ID and location identifier be a single thing (IP address): https://www.youtube.com/watch?v=QIGSMLrU4Xw and the solution: https://en.wikipedia.org/wiki/Locator/Identifier_Separation_...

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