42 Providing on-line non-downloadable computer software for use as a cryptocurrency wallet, providing temporary use of non-downloadable web-based decentralized applications (dapps) for specify the function of the applications, e.g., cryptocurrency trading, cloud storage of data, web browsing, etc. and, if software is content- or field-specific, the field of use, providing a website featuring technology that enables users to generate printable cryptocurrency wallets, technological consulting in the field of cryptocurrency, providing technology information in the field of cryptocurrency, electronic storage of cryptocurrency for others, providing user authentication services using blockchain-based software technology for cryptocurrency transactions, providing on-line non-downloadable software for generating cryptographic keys for receiving and spending cryptocurrency