Urbit is a network where you can, by default, trust the other party you're communicating with. It does this by making identities hierarchically controlled; if y

Urbit is a network where you can, by default, trust the other party you're communicating with. It does this by making identities hierarchically controlled; if you behave badly, the rest of the network will blacklist you and your master. Thus, your master has a strong incentive to police your behavior. tl;dr; it should be a spam free network. Note that this is already a mechanism used in the public stock markets; your broker polices your behavior because if you screw up, the broker is on the hook for your losses, and the clearinghouse is on the line for the broker's losses.