Definition
Web Authentication: An API for accessing Public Key Credentials - Level 3 defines AuthenticatorAttestationResponseJSON
dictionary AuthenticatorAttestationResponseJSON {
required Base64URLString clientDataJSON;
required Base64URLString authenticatorData;
required sequence<DOMString> transports;
// The publicKey field will be missing if pubKeyCredParams was used to
// negotiate a public-key algorithm that the user agent doesn't
// understand. (See section “Easily accessing credential data” for a
// list of which algorithms user agents must support.) If using such an
// algorithm then the public key must be parsed directly from
// attestationObject or authenticatorData.
Base64URLString publicKey;
required long long publicKeyAlgorithm;
// This value contains copies of some of the fields above. See
// section “Easily accessing credential data”.
required Base64URLString attestationObject;
};