What chain is synthetix on?

Could you please clarify which blockchain network Synthetix is currently operating on? As the crypto industry evolves rapidly, it's important to stay updated on the specific chains and networks that various projects utilize. I'm interested in understanding the underlying infrastructure that Synthetix leverages for its decentralized financial products and services. Knowing this information will help me better assess the project's scalability, security, and overall viability in the long term. Thank you for your assistance in clarifying this matter.