Does Coinbase have its own chain?

Could you please clarify if Coinbase, a renowned cryptocurrency exchange platform, maintains its own blockchain network? This question arises given the significance of blockchain technology in the cryptocurrency landscape and the potential for exchanges to develop their own chains. Understanding whether Coinbase has its own chain would provide insights into the company's technological capabilities and its strategic positioning in the ever-evolving cryptocurrency market. If Coinbase does possess its own chain, it could suggest a deeper commitment to blockchain development and potentially novel services or products for its users.