A method of and a system for user authentication in an electronic service for transmitting digital objects, the electronic service accessible by a client device via a client application, the client application associated with at least one native network protocol. The method includes receiving a request for access to a user profile in the electronic service, including user account data and at least one user behavior parameter; responsive to at least one user behavior parameter being different from the user behavior parameters stored in the user profile, creating a digital object with an indication of a verification routine; transmitting the digital object via the native network protocol to the client application, the digital object configured to cause the client device to perform the verification routine via at least one non-native network protocol; responsive to the verification routine rendering a positive outcome, granting access to the user profile.