I don't understand what problem is this system trying to solve, it just seems overcomplicated to me. > there should be economic incentive to only communicate v

I don't understand what problem is this system trying to solve, it just seems overcomplicated to me. > there should be economic incentive to only communicate valuable information. Sending an e-mail should cost "something". Why wouldn't this be solved by attaching a simple POW to every message? The trust thing is a non-issue, you'd just whitelist people or domains you trust.