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An array of X.509 certificates DER encoded and PEM encoded one of which will be used to sign an attestation token. Also the "x5c" parameter in RFC 7517 section 4.7
OptionalkeyThe Key ID for the signer, as defined by the "kid" parameter in RFC 7517 section 4.5
An AttestationSigner represents a signing certificate chain/Key ID combination returned by the attestation service.