A liveness detection approach requiring explicit user participation — blinking, turning the head, reading a displayed prompt — to confirm a live person is present. More resistant to basic photo attacks but creates more friction than passive approaches.
Category: biometrics. Part of the Identity Technologist Glossary — 158+ practitioner-grade definitions covering identity verification, KYC/AML, biometrics, fraud prevention, and compliance. See all terms at https://identitytechnologist.com/glossary.