Doesn't this tie into the idea of a reputation economy? I think the darknet (there are others/purse.io as well) is out in front on this again. When you have completed your obligations, it's customary for the buyer to upvote you, boosting your reputation. When you screw around, the opposite happens.
Wouldn't this be simpler than a formal, snapshot audit? Possibly this reputation facility already exists somewhere for DASH proposals and I missed it.
The Shrem thing is particularly baffling. My hunch is, he has absconded. I'm left to wonder what his motivations are.