Ehor is a permission-based Blockchain network, which holds the references of electronic health records, exchanged with permissions, between multiple EHRs. Patient's control access to their records via their EHRs mobile app, and can grant permission to any provider whose EHR joins the network. The network allows providers to then synchronize data on that patient securely over blockchain to all connected EHR records they've been given permission to, while data is traditionally stored on their associated EHRs database. The network is open for any EHR to join through Ehor.