Anthropic has introduced an identity verification mechanism in some use cases of Claude.

When users access specific features or trigger routine platform integrity checks, the system will require verification through Persona to prevent abuse, which involves providing a valid government-issued ID (passport, driver's license, or national ID) and taking a real-time selfie.
Officially, the verification data is only used to confirm identity, not for model training, nor for marketing or advertising.
In February of this year, Anthropic publicly accused DeepSeek, Moonshot, and MiniMax of launching a distillation attack on Claude using approximately 24,000 fake accounts, extracting over 16 million conversations. This is most likely the direct reason for the launch of the identity verification feature.
The Persona responsible for verification has also been controversial.
Also in February of this year, security researchers discovered that Persona's frontend code was openly exposed on a government-authorized endpoint, with 2,456 files directly accessible, showing it has 269 types of verification checks.
Persona later stated that this environment was non-production and did not involve customer data.
Discord subsequently terminated its partnership with Persona.