Is Oasis built on Ethereum?

Could you please clarify for me if Oasis is indeed constructed on the Ethereum blockchain? I'm curious to know if it leverages the security, scalability, and decentralization features that Ethereum is renowned for. I'm also interested in understanding if Oasis' architecture allows for seamless interoperability with other Ethereum-based projects and tools. Could you provide more insights into this matter? I'm eager to learn more about Oasis' technological foundation and its potential within the cryptocurrency and finance landscape. Thank you for your assistance in addressing my query.