Design, development, and implementation of computer software; platform as a service (PaaS) services featuring computer software platforms for secure file sharing; platform as a service (PaaS) services featuring computer software platforms for direct communication between users; platform as a service (PaaS) services featuring computer software platforms for providing decentralized secure access to and revision control and auditing of online documents; software as a service (SaaS) services featuring software for enforcing, restricting, and controlling access privileges of users of computing resources and online documents; software as a service (SaaS) services featuring software for optimizing machine-to-machine communications; software as a service (SaaS) services featuring software for securely managing digital keys; software as a service (SaaS) services featuring software and applications used to facilitate submitting transactions, downloading transaction logs, and verifying transaction receipts in the field of secure online access to computing resources and online documents, using private blockchain ecosystems; software as a service (SaaS) services featuring software and applications for data integration, business logic, and event-driven functions; software as a service (SaaS) services featuring software and applications for performing autonomous data discoveries, business intelligence, data analytics, and business analytics; technological research, consultation, and implementation services in the field of blockchain-based software technologies, decentralized secure access control of online resources, secure digital key management, machine learning, and data analytics; blockchain as a service in the nature of providing user authentication services using blockchain-based software technology