This is not to be confused with "subnets" that Hiro Systems is building. This is my own stab at building an off-chain causally-consistent asset trading system.
Disclaimer: I'm trying to flesh out a system that has only been described at a very high level. The purpose of this document is to write down notes on how I currently and tentatively believe subnets will work. This document is not authoritative, and may be significantly revised or even deleted.
All the credit for this approach goes to Aaron Blankstein. This document is based off of a conversation I had with him. I'm merely filling in the gaps.