In order to provide improved matching of records between different sources, systems and methods include generating a data link between a stored interaction profile of the user and activity data records that identify activities performed by the user. Online interaction data associated with the user is received, including tracking data indicative of online interactions with content. The online interaction data is stored in the stored interaction profile associated with the user. An activity model is used to predict correlation parameters representing groupings of online interactions of the online interaction data with activities performed by the user, where the prediction is based on the tracking data and each activity in the interaction profile. The interaction profile is updated with the groupings and user activities are authenticated based on the interaction profile.