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Verifying human uniqueness requires distinguishing new users from all existing network participants, creating an exponential entropy problem that breaks traditional 1-to-1 biometric authentication.

Impact: Legacy facial and fingerprint systems will fail at scale, forcing a migration to high-entropy biometrics like iris scanning paired with distributed cryptographic verification.

— from Proof of Human: Securing Digital Trust in the AI Era · a16z Podcast· Apr 02, 2026