What chain does dYdX use?

As a keen observer of the cryptocurrency and decentralized finance landscape, I'm curious to know the underlying technology that powers the innovative trading platform, dYdX. Could you elaborate on the specific blockchain network that dYdX utilizes? Understanding the chain's capabilities and features is crucial for assessing the platform's scalability, security, and overall performance. Additionally, it would be interesting to know if dYdX has plans to explore other blockchain options in the future, given the rapidly evolving nature of this technology.