US Patent 10038968 Branching mobile-device to system-namespace identifier mappings

Provided is a process of merging data from feeds from multiple sources of computing device network activity data having heterogenous device identifier namespaces and device identifier to device mappings that change over time, the process including: accessing three or more sources of network activity log data from three or more different sources of network activity data, wherein: for each of the sources of network activity log data, based the respective network activity log data, updating a multi-namespace mapping that maps the external-namespace device identifiers to internal-namespace device identifiers in an internal namespace of a system configured to profile mobile computing devices based on logged network activity data of the mobile computing devices, wherein: the namespace mapping comprises a plurality of external-namespace-specific mappings each mapping a respective type of device identifier in a respective external namespace used in the network activity log data to one or more internal-namespace device identifiers.