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Things that we’re pretty sure about in the Architecture Document Message-oriented abstraction But messages can be short (100 bits) Some pressure to support streaming Store and forward operation with Custodial transfers (advancing the point of retransmission toward the destination) Network of internets Postal-like COS: Relative priorities and basic notifications Synchronized time (to some degree) and time-based message purge Fragmentation (proactive and reactive) Two-part endpoint identifiers (region, admin; admins opaque outside region; eventual reachability within a region) Taxonomy of contacts |