42 Computer software design in the field of cryptocurrency exchange; updating of computer software in the field of cryptocurrency exchange; maintenance of computer software in the field of cryptocurrency exchange; installation of computer software in the field of cryptocurrency exchange; monitoring of computer systems by remote access to ensure proper functioning in the field of cryptocurrency exchange; internet security consultancy in the field of cryptocurrency exchange; data security consultancy in the field of cryptocurrency exchange; platform as a service (PaaS) featuring computer software platforms for trading, storing, sending, receiving, accepting, transmitting and managing digital currency and payment exchange for cryptocurrency and non-fungible tokens; software as a service (SaaS) featuring computer software for trading, storing, sending, receiving, accepting, transmitting and managing digital currency and payment exchange for cryptocurrency and non-fungible tokens; cryptocurrency mining co-location services, namely, providing facilities for the location of computer hardware for cryptocurrency mining with the equipment of others; cryptocurrency staking, namely, locking digital tokens to a network to earn rewards; providing use of online non-downloadable software for use in trading and storing of cryptocurrency; data cryptology services, namely, encryption and decryption; design and development of computer hardware and software for cryptocurrency and non-fungible tokens; technical data analysis services; electronic monitoring of transaction and device activity to detect fraud via the Internet; authentication services for computer security, namely, providing user authentication services using blockchain-based software technology for cryptocurrency transactions; user authentication services using blockchain technology, namely, providing user authentication services using blockchain-based software technology for cryptocurrency transactions; providing user authentication services using single sign-on technology for online software applications; creation of a virtual environment in the nature of computer services, namely, creating an on-line virtual environment for a cryptocurrency wallet.