What chain is DigiByte on?

Could you please clarify which chain DigiByte operates on? As a cryptocurrency enthusiast, I'm curious about the underlying technology that supports DigiByte's transactions and how it fits into the broader blockchain ecosystem. Does DigiByte utilize its own unique blockchain, or is it built upon an existing platform like Ethereum or Bitcoin? Understanding the specifics of DigiByte's blockchain will help me better assess its potential and evaluate its place in the cryptocurrency market.