US Patent 10193882 Provision of cross-device identification

Described are methods, systems, and apparatus, including computer program products for provision of cross-device identifiers. A cross-device ID is assigned by a computing entity matching system on a first domain to a browser and to one or more computing entities. A request for a webpage is sent by the browser to a server on a second domain. The webpage, including cross-device ID retrieval instructions, is received by the browser. The cross-device ID retrieval instructions are executed to send a request to the computing entity matching system including a matching system ID. The cross-device ID is determined based on the matching system ID. Cross-device ID storage instructions, including a distributed cross-device ID, are sent by the computing entity matching system. The cross-device ID storage instructions are executed by the browser. A request for a webpage, including the distributed cross-device ID, is sent by the browser to the server.