What is proof of reserve Coinbase?

As a cryptocurrency enthusiast, I'm often intrigued by the various mechanisms employed by exchanges to ensure transparency and trust. One such concept that has piqued my interest is the proof of reserve utilized by Coinbase. Could you elaborate on what proof of reserve Coinbase entails? How does it work, and what are the key benefits it provides to users? Additionally, how does Coinbase ensure the accuracy and reliability of its reserve disclosures? Understanding the intricacies of this system would help me gain a deeper insight into the exchange's operations and financial stability.