One point that’s useful to understand about sponsors is that while Urbit IDs always need a sponsor, or parent node on the network (primarily for peer discovery), it’s always possible to change sponsors and sponsors can always reject children. This means bad actors can be banned and abusive sponsors can be ignored. We think this strikes a nice balance between accountability and freedom.

Third, governance: galaxies (the top of the sponsorship tree) form a senate that can upgrade the logic of the Urbit ID system by majority vote. We think Urbit ID will last for quite a long time, but if it ever needs to be updated, the galaxies can vote to approve, reject, or propose changes to the contracts. Code may be law, but ultimately we acknowledge that human judgment can’t be factored out.

The Urbit ID sponsorship tree is not intended to be a social system in any way. Interactions between people and communities on the Urbit network are peer-to-peer, entirely organic and completely...