The Technical Architecture document on Persistent Identifiers (PIDs) describes a high-level view on components and stakeholders relevant inside an architecture for persistent identification based on namespaces. It is generic in the sense that the components are described independently of a concrete technical implementation. The PID Technical Architecture document will additionally identify opportunities for how interoperability between PID services can be achieved within the framework of the European Open Science Cloud (EOSC). Drawing from the EOSC guidelines, it identifies stakeholders at different levels of PID namespaces, their roles and their ability to enforce policies. The PID Technical Architecture document is mainly targeted at PID and generic service providers and practitioners as guidelines on implementation of PIDs and related services compliant with PID Policy within the EOSC. But it may also be of interest for technically interested PID practitioners and for policy makers acting on an organisational level.