As the identity landscape continues to evolve, email addresses are emerging as a primary key for identity integrations across the board. One example to illustrate this is the prevalence of an email address as the primary key of many universal ID solutions, such as The Trade Desk's UID 2.0, LiveIntent, ID5, and many others. As a result, buyers in the AdTech space have started to center their first-party Identity strategy around scaling their programs to collect or license email addresses. In response, FreeWheel has added Hashed Email Addresses (HEMs) to the FreeWheel Identity Network. This solution offers a shortcut for clients to skip Personal Identifiable Information-based (PII) ID onboarding, and go straight to segment uploading and clean-room-based measurement. The FreeWheel Identity Network has over 400 million distinct hashed emails at both the person and household levels. This page focuses on uploading Hashed Email Addresses into segments directly.