Creation and Consumption of Transient User Profiles

Transient user profiles are generated and broadcast to nearby recipient devices. In some implementations, a transient user profile is generated from a master user profile that includes user information. The master user profile can be stored in encrypted form on the user's mobile device or on a network-based computer system where it can be accessed upon authentication. The master user profile can include information provided by the user or retrieved from other network-based computer systems. The master user profile can include information that is labeled with security tags that indicate the class of users that may receive the user information. From the master user profile, a transient user profile can be generated in response to a sharing event and broadcast to other nearby recipient devices.