What network is Oasis on?

Excuse me, I'm a bit unfamiliar with the specifics of the Oasis project. Could you please elaborate on what network Oasis is built upon? I've heard it mentioned in a few blockchain discussions, but I'm not entirely clear on its underlying infrastructure. Is Oasis utilizing an existing blockchain network, or has it developed its own proprietary blockchain solution? Understanding this fundamental aspect of Oasis's operation would greatly assist me in assessing its potential and implications for the broader cryptocurrency and finance landscape. Thank you for your time and clarification.