42 software development in the field of video chats and online chats; installation of computer software in the field of video chats and online chats; maintenance of computer software in the field of video chats and online chats; quality control; user authentication services using single sign-on technology for video chats and online software applications; user authentication services using blockchain technology for video chats and online software applications; computer software consultancy for digital transformation; data encryption services; electronic data storage