If the certReq field is present and set to true, the TSA's public key certificate that is referenced by the ESSCertID identifier inside a SigningCertificate attribute in the response MUST be provided by the TSA in the certificates field from the SignedData structure in that response. That field may also contain other certificates.
If the certReq field is missing or if the certReq field is present and set to false then the certificates field from the SignedData structure MUST not be present in the response.
The extensions field is a generic way to add additional information to the request in the future.
Contains the hash of the datum to be time-stamped
The nonce, if included, allows the client to verify the timeliness of the response when no local clock is available. The nonce is a large random number with a high probability that the client generates it only once.
Indicates the TSA policy under which the TimeStampToken SHOULD be provided.
Version of the Time-Stamp request. Should be version 1.