An attestation technique is provided for processing attestation data associated with a plurality of data processing systems. A first data processing system is operable for receiving a request for attestation from a requester. In response to receiving the request, the first data processing system is further operable for retrieving a list of one or more children, wherein the one or more children include the second data processing system; retrieving and storing attestation data associated with each of the one or more children; retrieving and storing attestation data associated with the first data processing system; and sending to the requester a concatenated response containing the attestation data associated with the first data processing system and the child attestation data associated with the one or more children.