42 Design, development, implementation and operation of software in the field of blockchain, cryptocurrency and digital tokens; advice on software development and product development in the field of blockchain technology, cryptocurrency and digital tokens; Providing user authentication services using blockchain-based software technology for cryptocurrency; Certification of data by means of blockchains, namely, authentication, issuance and validation of digital certificates using blockchain technology; Electronic data storage by means of blockchain technology; authentication of data in the field of health financing, health project implementation and healthcare by means of blockchain technology; User authentication services by means of blockchain technology for health financing, health project implementation and healthcare