Networks are external from an architecture perspective and provide security guarantees based on the level of decentralization and other factors.
Proofs produced upon the successful execution of an off-chain workstep are written to Provide Privacy, where they are submitted to the configured Layer 3 rollup network. The selection of the Layer 3 network is important as it inherently configures the available n-tier settlement networks (i.e., the Layer 2 and its inherent Layer 1 support, etc.).
Settlement occurs on the selected rollup network. The selected settlement network may or may not include a given proof in an upstream rollup based on the workstep configuration. The ability to specify an optional settlement network reduces transaction costs and increases throughput for enterprise scale.
Shuttle uses a third network layer the,
PRVD Network, a rollup network that can be configured during onboarding by an ecosystem operator.