The Universal ID For The Advertising Industry
Coverage of a 3rd party ID
and persistence of 1st party
1st and 3rd Party
Publishers can write the SharedID common identifier as either a first-party or third-party value. SharedID includes Publisher Common ID, a widely used first-party identifier that stores a unique user ID in the first party domain and makes it accessible to all bid adapters.
SharedID improves user matching, including iOS and MacOS browsers, and is compatible with ITP (Intelligent Tracking Prevention). SharedID has a single-point opt-out to give consumers full control over their privacy and their advertising preferences.
Replace your proprietary value and use SharedID for sandboxing.