I was reading some information about this project and I got a simple question, how is the ReapChain system designed? I would like to know some information about this, maybe I missed something interesting

ReapChain system is designed with a system architecture consisting of ReapChain Main Net Layer, ReapMiddleChain Layer, and DApp Layer
The hierarchical architecture has the advantage that it is easy to improve the performance or performance of a particular tier without modifying the entire system.