What chain is Zil on?

Could you please elaborate on the blockchain network that Zil is built upon? As a cryptocurrency enthusiast, I'm curious to understand the technological foundation that Zil leverages to ensure its scalability, security, and overall performance. Is Zil leveraging an existing blockchain platform like Ethereum or Bitcoin, or has it developed its own proprietary blockchain? If it's the latter, what are the key distinguishing features that make Zil's blockchain unique? Your insights would be invaluable in helping me gain a deeper understanding of Zil's underlying technology.