42 Authentication services; designing and developing computer software for authentication and authorization, for accessing the Internet and Intranet, for electronic proof of identity and for electronic signature; user authentication services using technology for e-commerce transactions; user authentication services by means of blockchain technology; designing and developing software for digital commercial transactions; designing and developing software for digital identification; designing and developing software for digital signature; designing and developing computer software and data processing software for electronic proof of identity and electronic signature; electronic monitoring of personal identification information for the detection of identity theft via the Internet; designing and developing computer software and data processing software for portals on the Internet, e-commerce portals, Internet platforms and e-commerce platforms, in particular for digital commercial transactions, digital identifications, customer identifications, authentications and authorizations, electronic proof of identity and electronic signatures; rental of computer software; providing software for authentication and verification; providing software for digital identification and electronic proof of identity; technological services for authentication of identity and digital signatures in electronic transactions; encryption, decryption and authentication of information, messages and data, in particular for electronic proof of identity and for electronic signature; consultant services with respect to data security; development (design) and development of electronic data security systems; customizing software for digital commercial transactions, for digital identification, for digital signature, for electronic proof of identity and for electronic signature; software as a service (SaaS) with software for digital commercial transactions, for digital identification, for digital signature, for electronic proof of identity and for electronic signature; computer platform as a service (PaaS) with software for digital commercial transactions, for digital identification, for digital signature, for electronic proof of identity and for electronic signature; technological services for sending signed and/or encrypted email; technological services for sending authenticated and authorized email, electronic proof of identity and electronic signatures; computer security services for protection against unauthorized network access in the field of identification, authenticatiion and entity authentication; technological services for user authentication, user authentication and identity checking, especially in e-commerce stores; technological services and computer security services for protection against unauthorized access to networks for securing computer data as well as personal and financial information and for detecting unauthorized access to data and information; advice relating to all the aforesaid services