What chain is Metis on?

As a keen observer of the cryptocurrency landscape, I must ask: what chain does Metis operate on? Given the plethora of blockchain solutions out there, from Ethereum to Solana and beyond, it's crucial to understand the underlying infrastructure that powers a project like Metis. Its choice of chain could determine its scalability, transaction speeds, and ultimately, its success in the crowded crypto space. So, could you elaborate on the chain that Metis utilizes and how it fits into the project's overall vision and goals?