This document describes the reference architecture of the DPP system. This architecture is intended to bridge the gap between the intentions of the European regulators, as expressed in the ESPR, and the companies developing components of the DPP system. The purpose of this architecture is to elaborate, reason and illustrate what the DPP system could look like, and enables the specification of programming interfaces and development of software components in the next steps of the CIRPASS-2 project.