Certification of the executed service is a critical issue for an e-government infrastructure. In
fact, given the legal value that is often attached to data managed and exchanged by public
administrations, being able to document the actual execution of e-services is of the utmost
importance. This is made more complex in cases, as often happens in the public
administration sector, where e-services are based on legacy systems managed by
autonomous and independent organizations. In this paper we discuss, starting from real-life …