Providing temporary use of on-line non-downloadable software for authenticating user identification; Providing user authentication using software technology for accessing protected accounts over the internet; Providing on-line non-downloadable software for authenticating digital signature identification; Providing user authentication services using single sign-on and biometric software technology for a blockchain authentication system in the field of user identity management, cryptographic authentication, and verification of personal identification information; Providing on-line non-downloadable software for authenticating users' biometric identification using biometric software technology for restricting unauthorized access to computer networks via a decentralized application; Providing temporary use of on-line non-downloadable software development tools for computer user identification and authentication for use with decentralized applications, decentralized internet services, and blockchain-based transactions across different devices; authentication of data in the field of computer security, namely, user authentication services using blockchain technology to verify personal identification information