A technique for attesting a plurality of data processing systems. The method includes: configuring a chain of data processing systems wherein a first data processing system is responsible for retrieving attestation data associated with a second data processing system; sending a request for attestation of the first data processing system; in response to receiving the request, retrieving a list of associated one or more children, wherein the one or more children comprise the second data processing system; retrieving and storing attestation data associated with each child; 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 and second data processing systems, such that the attestation data associated with the first and second data processing systems can be used to attest the first and second data processing systems, respectively.