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This issue of the Urbit Systems Technical Journal unveils technical descriptions of significant milestones in Urbit’s ongoing development:- The design and implementation of Urbit’s named data networking scheme, Directed Messaging, a core component of the 'Neo-Urbit' vision.- 'Subject knowledge analysis' for Hoon static analysis.- Comet cryptography, a portion of the Groundwire proposal for arevision of Urbit’s peer-to-peer schema beyond Azimuth.- The serialization mechanism for nouns.- Obelisk, a return to E. F. Codd’s relational algebra and SQL.The Urbit Systems Technical Journal publishes articles on the ongoingdevelopment of Urbit and on solid-state computing more. Like thefamous Bell System Technical Journal on which it is modeled, theUrbit Systems Technical Journal aims to document the engineering worknecessary to realize the vision of computing as sovereign, deterministic,and grounded on solid first principles. In so doing, we hope that thesetechnical problems come to interest and benefit the broader developercommunity. Functional (as in programming) engineers are often on theleading edge of software development, and the solutions they undertakehave required large-scale innovations in the field of computer sciencegenerally. The volume of USTJ which you hold in your hand highlightsdevelopments in the Nock computing system which underlies Urbit andNockchain. We welcome submissions from those engaged in makingcomputing more solid-state.