More devices, fewer CAPTCHAs, happier users

What this post added

This post expands the Cryptographic Attestation of Personhood experiment to support a wider range of devices, including biometric authenticators (Apple's Face ID, Microsoft Hello, Android Biometric Authentication) and FIDO-certified USB and NFC keys. It introduces the use of Zero Knowledge Proofs (ZKP) to further enhance privacy by only revealing the fact that a valid security key is present without disclosing other information. The post also details user testing and production usage data demonstrating improved solve times and user preference for these new authentication methods.