Computer security services in the nature of administering digital certificates; Computer security services in the nature of administering digital keys; Computer security services in the nature of providing authentication, issuance, validation and revocation of digital certificates; Design and implementation of software and technology solutions for the purpose of product and document authentication and tracking, and brand monitoring and protection, to protect against counterfeiting, tampering, and diversion, and to ensure the integrity of genuine products and documents; Design, development, and implementation of software for paperless and authentication procedures; Electronic signature verification services using technology to authenticate user identity; Providing user authentication services using biometric hardware and software technology for e-commerce transactions; Providing user authentication services using blockchain-based software technology for cryptocurrency transactions; Providing user authentication services using single sign-on technology for online software applications; User authentication services using single sign-on technology for online software applications; User authentication services using technology for e-commerce transactions