42 Platform as a service (PAAS) featuring computer software platforms for accounting, accessing, reviewing, analyzing, organizing and managing financial and cryptocurrency transactions, smart contracts, and information and for securing and preserving confidentiality of user data; Authentication of data in the field of financial and cryptocurrency transactions using blockchain technology; Providing on-line non-downloadable computer software for use as a cryptocurrency wallet; Providing temporary use of on-line non-downloadable software for accessing, reading, and tracking information in the field of contracts and agreements and financial and cryptocurrency transactions on a blockchain; Providing user authentication services using blockchain technology for e-commerce transactions; Providing user authentication services using blockchain-based software technology for cryptocurrency transactions; Software as a service (SAAS) services featuring software for creating, accessing, reviewing, analyzing, organizing and managing contracts and agreements and software for preserving confidentiality of user data; Software as a service (SAAS) services, namely, hosting software for use by others for accounting, accessing, reviewing, analyzing, organizing and managing financial and cryptocurrency transactions, smart contracts and information and for preserving confidentiality of user data; Software as a service (SAAS) services featuring software for accounting, accessing, reviewing, analyzing, organizing and managing financial and cryptocurrency transactions, smart contracts and information and software for preserving confidentiality of user data; User authentication services using technology for e-commerce transactions; User authentication services using blockchain technology for financial and cryptocurrency transactions and smart contracts