What chain is Osmosis on?

Could you please elaborate on the underlying blockchain technology that Osmosis is built upon? Given the growing interest in interoperability and cross-chain solutions, it's crucial to understand the foundational layer that enables Osmosis to facilitate seamless transactions and asset swaps across different blockchains. Is Osmosis leveraging an existing blockchain infrastructure, or has it developed a proprietary solution? Clarifying this aspect would greatly assist in evaluating the potential impact and scalability of Osmosis within the broader cryptocurrency and decentralized finance ecosystem.