Abstract: Embodiments of the disclosure relate to a method and system for establishing sorting order for events from a plurality of systems. Central Unique Identity Service (CUIS) provides a unique ID to a client for an event. The client is a service provider registered with the CUIS. User is a subscriber of the client. The User initiates an event with the client using his computing or communication device. The client requests for a unique ID for the initiated event with the CUIS through a network, before the event is performed or executed. The CUIS records the unique ID along with predefined attributes of the client application, the application identifier for the event, application network identity, application user and the user's device associated with the event in the CUIS unit. The CUIS thus establishes a sorting order for the unique ID's recorded and thereby for the events across all clients.