What network does XDC use?

Could you elaborate on the network utilized by XDC? I'm curious to understand the underlying technology and infrastructure that powers this particular cryptocurrency. Specifically, is it a fork of an existing blockchain, or does it utilize a novel consensus mechanism? Additionally, how does the network handle scalability, security, and transaction speed? I'm interested in gaining a deeper insight into the technical aspects of XDC and how it differs from other crypto projects.