What network is XDC on?

Could you please elaborate on the network that XDC, or XinFin Digital Contract, is currently operating on? I'm curious to understand the underlying infrastructure that supports this cryptocurrency and its transactions. Is it a public blockchain? If so, which consensus mechanism does it utilize? Additionally, how does it compare to other popular blockchain networks in terms of scalability, transaction speed, and cost-efficiency? Understanding the network foundation of XDC is crucial for assessing its potential and evaluating its position in the cryptocurrency market.