Is Oasis Rose a layer 1?

Could you please clarify for me whether Oasis Rose qualifies as a layer 1? I've been hearing different opinions about this, and I'm trying to get a more definitive answer. Is it considered a fundamental, standalone blockchain that operates independently, or does it rely on another layer for its core functionalities? If it's the former, could you elaborate on the unique characteristics or advantages it offers as a layer 1? And if not, how does it fit into the larger blockchain ecosystem? I'm really interested in understanding this more deeply. Thank you for your time and expertise.