Contactless Authentication Using Decentralized Identifiers and Biometric Depth Verification

The patent replaces contact-type mechanical biometric authentication with contactless authentication using depth information from time-of-flight (ToF) sensors. This substitutes the mechanical contact system with an optical field-based system that measures distance and depth without physical contact, thereby maintaining authentication reliability while eliminating hygiene concerns.

The patent introduces depth information as an intermediary element in the authentication process. By using ToF sensor data that measures the distance between the user's face and the sensor, the system creates an indirect verification mechanism that doesn't require direct contact, thus resolving the contradiction between reliable authentication and hygiene requirements.

The patent segments the centralized identification system into distributed components using blockchain technology. Each user's biometric data and authentication records are stored as individual blocks on the blockchain, giving users control over their own data while maintaining system-wide authentication functionality. This segmentation preserves information sovereignty while keeping the authentication process accessible.

The patent implements self-service authentication where users independently manage their biometric information on the blockchain without requiring a centralized authority. Users can autonomously control access to their data through cryptographic keys, eliminating the need for centralized identification while maintaining operational simplicity through automated verification processes.

The patent creates a composite authentication system that combines multiple verification elements: traditional biometric data, depth information from ToF sensors, and blockchain-based cryptographic verification. This composite approach maintains fast authentication by using readily available biometric data while enhancing security through the addition of depth verification and immutable blockchain records that prevent copying and stealing.

The patent applies beforehand cushioning by pre-storing verified biometric templates and depth information on the blockchain before authentication is needed. This allows for rapid authentication since the verification data is already prepared and stored immutably, eliminating the need for real-time complex calculations while maintaining high security through cryptographic protection of the pre-stored data.