Shared identity frameworks built to work across publishers and platforms without relying on third-party cookies. The Unified ID 2.0 consortium approach uses hashed email addresses as the persistent identifier. Adoption requires publishers to implement and users to consent. Both are real constraints. The solutions that have gained the most ground are those with the broadest publisher participation, which still leaves significant gaps, particularly in environments where email capture is low.
Ad tech glossary
Unified ID Solutions
Technical definition
Identity resolution frameworks that aim to provide consistent user identification across different platforms and environments while respecting privacy.
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