Passkey Credential Info
@Serializable
Standard passkey credential information for backup metadata.
This follows the industry-standard WebAuthn credential structure used by Google, Apple, GitHub, and other major implementations.
SECURITY: This structure contains only PUBLIC information. The PRF secret (encryption key) is NEVER stored here.
Properties
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ISO8601 timestamp when credential was last used
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JWK-format public key for signature verification
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Supported transport methods (e.g., "internal", "usb", "nfc")
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Opaque user identifier (backend-generated)