sdks and node.
The sdks repository includes types, methods, and interfaces used in both frontend and backend. It contains most of what you need to interact with the Demos Network from a dApp, plus the building blocks for a custom client. See the SDK Getting Started guide for an introduction, or the WebSDK overview for the main client surface.
The node repository contains the official implementation of Demos Network specifications for a backend client (commonly known as a node). Nodes form the core of the network and can act either as validators or as synced read-only nodes. For an in-depth tour of node-side mechanisms, start with Internal Mechanisms, Consensus Mechanism, and the Global Change Registry.