Described systems and techniques enable anonymous collection of sensor data related to vehicle driving events of a vehicle. A start event of the vehicle may be detected, and an anonymous name may be generated, based on the start event. A subset of the sensor data related to a start-specific event of the vehicle may be extracted. The subset of the sensor data may be stored in an event file for the start-specific event that is designated using the anonymous name, and the event file may be uploaded from the vehicle to an external network.