US Patent 11018874 Digital signature verification for asynchronous responses

A client obtains, in response to a request to a server, a response that includes data for fulfillment of the request, a digital signature that can be verified using a digital certificate, and location information that specifies a location where the digital certificate can be obtained. The client uses the location information to access the location and obtains the digital certificate. Using the digital certificate, the client evaluates the digital signature provided in the response to determine whether the digital signature is valid. If the digital signature is valid, the client accepts the data included in the response for fulfillment of the request.