Providing temporary use of on-line non-downloadable software for user login, identification, and authentication; Providing user authentication using software technology for accessing protected accounts over the internet; Providing on-line non-downloadable software for digital signature identification; Providing user authentication services using single sign-on and biometric technology for a blockchain authentication system, namely, providing user identity management, cryptographic authentication, and verification of personal identification information; Providing on-line non-downloadable software for biometric identification for user authentication, fraud prevention, tracking prevention, and restricting access to computer networks via a decentralized application (dapps); Providing temporary use of on-line non-downloadable software development tools for computer user identification and authentication for use with decentralized applications (dapps), web3 internet services, and blockchain-based transactions across different devices; authentication of data in the field of computer security using blockchain technology