In this presentation, we explore the concept of the National Persistent Identifier (PID) graph. Connections between ORCID, ROR, DOI, RAID, and other PIDs provide a valuable source of information about the digital footprint of research and the collaboration network of researchers. We provide insights into these connections across the Australian research ecosystem such as the role of ORCID in connecting researchers to nationally funded grants by Australian Research Council (ARC), the coverage of ROR in Australia, and the scope of FunderID in connecting research outputs to Australian research institutions.