electronic storage of data; electronic data storage and data back-up services; computer security services; data storage via blockchain technology; data authentication via blockchain technology; data encryption and decoding services using blockchain technology; data certification services using blockchain technology; data authentication services via blockchain technology; user authentication services using blockchain technology; data storage via blockchain; data authentication services via blockchain; certification of data via blockchain technology; certification of data provided via blockchain technology; certification of data via blockchain; authentication of data in the field of works of art using blockchain technology; provision of online non-downloadable web-based applications; software as a service [SaaS] featuring software for use in application and database integration; software as a service [SaaS] featuring software for use in database management; software as a service [SaaS] featuring software for creating, analysing and running programs for quantum computers; software as a service [SaaS] for analysing property and location data for detecting, modelling and predicting environmental changes and defensible spaces; hosting of software as a service [SaaS]; software as a service [SaaS] featuring database management software