Hosting of blockchain databases; Computer software development; Development of computer software application solutions; Development of computer software; Advisory services relating to computer software; Computer software advisory services; Computer support services (software advisory and information services); Design and development of computer software; Consultancy in the design and development of computer software; Design and development of computer software for others; Design of computer software; Information technology (IT) services (computer hardware, software and peripherals design and technical consultancy); Installation and maintenance of computer software; Cryptocurrency engineering