What chain is Ocean on?

As a cryptocurrency enthusiast and investor, I'm keen on exploring new projects and their underlying technologies. Could you please elaborate on the blockchain platform that Ocean Protocol is built upon? Understanding the chain Ocean resides on is crucial in assessing its scalability, security, and overall network efficiency. I'm particularly interested in knowing if it's a widely adopted chain, or if it's a specialized, niche solution tailored specifically for Ocean's decentralized data exchange. This information will help me make informed decisions about potential investments and collaborations.