Coins are held as group data and maintained by that group, so not distributed like immutable chunks, but managed more like structured_data_versions. Lots to document on that. Fraser and myself have managed to get out into a different office to get time to get some of the final design parts in place. The new system with Jira should allow all this to speed up considerably now. 8 YEars later I can design stuff that then just gets implemented, great. The drive and rudp stuff is looking to be shaping up nicely to (as you know :D) but we need to formalise there a little as well in case it diverges to much.