What chain is DOGE in?

Can you please clarify for me which blockchain network Dogecoin, or DOGE, is currently operating on? I'm curious to know if it's maintained on its own independent chain or if it's integrated into a larger ecosystem, and if so, which one specifically. Understanding the underlying technology and infrastructure of DOGE's blockchain can help inform investment decisions and gauge potential future developments. Thank you for your time and expertise in this matter.