Computer software design; Creation, design, development and maintenance of web sites for third parties; Design and development of software in the field of mobile applications; Platform as a service (PAAS) featuring computer software platforms for use in database management, for use as a spreadsheet, for word processing; Providing online non-downloadable software development tools for creating blockchain-based applications provided by a blockchain as a service (BAAS) provider; Rental of software for Internet access; Software as a service (SAAS) services featuring software for use in database management, for use as a spreadsheet, for word processing; User authentication services using blockchain technology for online software applications; User authentication services using single sign-on technology for online software applications; User authentication services using technology for e-commerce transactions