42 Providing on-line non-downloadable software for use as a cryptocurrency and security and utility tokens wallet; providing temporary use of web-based decentralized applications for connecting, operating, and managing networked houses, garages, vehicles, gates, doors, hotel rooms; technological consulting in the field of blockchain technology; providing user authentication services using blockchain-based software technology that automates transactions and actions between parties; providing on-line non-downloadable software for generating cryptographic keys for receiving and spending cryptocurrency, security tokens, utility tokens; providing on-line non-downloadable software for connecting, operating, and managing networked houses, buildings, garages, vehicles, gates, doors, hotel rooms, objects and devices in the internet of things; data authentication via blockchain technology in the field of financial transactions, internet of things; certification of data via blockchain, namely, data authentication in the field of financial transactions, internet of things; blockchain as a service, namely, providing online non-downloadable software for managing cryptocurrency transactions, for use in operating electronic devices and networks for implementing the internet of things; providing on-line non-downloadable software services for granting access to objects and devices, computer and information systems and restricted zones using blockchain technology