42 Data authentication via blockchain; Certification of data via blockchain; Data storage via blockchain; Computer programming of smart contracts on a blockchain; Programming of software for Internet platforms; Hosting of platforms on the Internet; Programming of software for information platforms on the Internet; Constructing an internet platform for electronic commerce; Development of computer platforms; Development of software for data and multimedia content conversion from and to different protocols; Design of software for data and multimedia content conversion from and to different protocols; Development of hardware for data and multimedia content conversion from and to different protocols; Mining of crypto assets; Design, software development, maintenance and hosting services of a software platform allowing developers to build decentralized applications in blockchain, on a decentralized and open internet platform or a distributed supercomputer; Design, software development, maintenance and hosting services of a non-downloadable B2B software platform which allows software developers and product managers to create new features and manage business on a decentralized and open internet platform in blockchain and to use specific software tools for building decentralized applications on the blockchain infrastructure; Application service provider services; Computer software customisation services; Software as a service (SAAS) services featuring software for decentralized finance and blockchain transactions; Software as a service (SaaS) services featuring software designed for the blockchain environment; Providing temporary use of non-downloadable computer software; Platform as a Service (PaaS) featuring software for decentralized finance and blockchain transactions; Configuration of computer software; Design and development of computer hardware and software; Providing online non-downloadable web application software for blockchain technology; advisory, information and consultancy services relating to the aforesaid services.