This document discusses open identifier infrastructure and describes the ARK (Archival Resource Key) scheme and N2T (Name-to-Thing) resolver. It notes that while URL infrastructure is open, persistent identifier infrastructure is mostly closed. It then outlines how ARKs break with tradition by having a decentralized resolution that allows metadata and relationships without conflict. The document concludes by describing how N2T provides centralized but id-agnostic resolution for ARKs and other identifiers while following open principles for scholarly infrastructures.