Abstract: Methods and systems for setting first-party cookies are disclosed. A first request for a first webpage is sent by a user device to a first web server on a first domain. The first webpage includes first ad system call instructions. The first ad system call instructions are executed to send a second request to an ad system on a second domain to initiate determining a supply side platform (SSP) user ID. First SSP call instructions are received by the user device. The first SSP call instructions are executed to send a third request to an SSP server on a third domain. Second ad system call instructions including the SSP user ID are received by the user device. The second ad system call instructions are executed to send a fourth request comprising the SSP user ID to the ad system. First storing instructions for the SSP user ID are received.

Abstract: 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.

Abstract: 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.

Abstract: Methods and systems for setting first-party cookies are disclosed. A first request for a first webpage is sent by a user device to a first web server on a first domain. The first webpage includes first ad system call instructions. The first ad system call instructions are executed to send a second request to an ad system on a second domain to initiate determining a supply side platform (SSP) user ID. First SSP call instructions are received by the user device. The first SSP call instructions are executed to send a third request to an SSP server on a third domain. Second ad system call instructions including the SSP user ID are received by the user device. The second ad system call instructions are executed to send a fourth request comprising the SSP user ID to the ad system. First storing instructions for the SSP user ID are received.