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Attestation allows the IdP (acting as a WebAutun WebAuthn RP) to verify the provenance of the authenticator used when registering a FIDO2 credential. This is provided in the form of an attestation statement. Attestation is optional as it can provide a poor user experience (the user must consent to the release of the attestation statement during registration), has an unclear meaning if the credential is synchronised around multiple devices (what created it might not be the same as what eventually uses it), and is a possible privacy concern (adds another data point for fingerprinting).
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