What is proof of reserve in toobit?

Can you elaborate on what proof of reserve in toobit entails? I'm curious about how it functions as a means of ensuring transparency and trustworthiness for users and investors. Is it a unique feature to toobit, or is it a common practice in the cryptocurrency industry? Additionally, how does it help to mitigate potential risks associated with holding digital assets? I'd appreciate a clear and concise explanation of the concept and its significance within the platform.