This presentation will focus on the topic of Digital Twin & Blockchain technologies. That consist of some fundamental concepts that are shared between these two digital networks. A comparison between the digital twin and blockchain digital networks is also elaborated in this presentation. The subtopics of this presentation consist of Evolution of Digital Networks, What is a Digital Network, Evolution of Digital Twin, What is a Blockchain, The Birth of a Blockchain, The Main Chain, Digital Twin & Blockchain, The Orphan Blocks, and Common Features of such digital networks.