I would love an open-behind-the-scenes-source Hubski! Just found Pyski, wondered if I should fork it, but then I saw that the API prototype is down (hasn't been here for about a year or so); so when the API is up server-side, I'm ready to help with the client-side bindings :) Again all the respect for your work!
Anyway, as a hobbyist cryptographer, may I ask if there is a plan/option to upgrade to SHA3 (Keccak) - I would like to see that feature, although I don't know much about Arc programming? Nevertheless, SHA2 is still treated as secure but with the slow rise of quantum giants, it wouldn't be anymore impossible to break it. Although it's a rather silly, paranoid idea, I know.