What are the 3 levels of masks?

Could you elaborate on the three distinct levels of masks within the realm of cryptocurrency and finance? In this context, I'm referring to the various degrees of anonymity and security measures employed by users to protect their identity and transactions. Understanding these levels is crucial for investors and enthusiasts alike, as it allows for informed decisions regarding privacy, risk mitigation, and compliance with regulatory requirements. Could you provide a concise yet comprehensive description of these three mask levels?