Persistent Identifiers & Identity Infrastructure
Persistent identifiers (PIDs) are the addressing layer beneath research information management: unique, long-lived, machine-resolvable strings that point to a person, an organization, a dataset, a publication, or a grant regardless of where that record moves online. This sub-cluster covers what makes an identifier "persistent" (a resolution service, a governance body, and a commitment to keep the pointer alive even when the underlying URL changes), how identifiers are registered and claimed, how they are looked up or resolved back to metadata, and how different identifier schemes interoperate so that a single researcher's ORCID iD, a funder's grant ID, and an institution's ROR record can all be linked into one connected graph. The pages here reflect the working division of labor among the major PID providers: ORCID for individual researchers, DataCite for datasets and other non-article outputs, ROR (the Research Organization Registry) for institutional affiliation, and Crossref for journal articles and DOIs generally. These organizations, along with the Research Data Alliance's PID-focused interest groups, coordinate on shared infrastructure and metadata schemas rather than each running an isolated silo — a coalition model rather than a single central registry. NISO's recommended practices for persistent identifiers in scholarly communications provide the closest thing to a cross-cutting technical standard for how these systems should behave. Research administrators use this layer daily: verifying an ORCID iD on a grant application, resolving a DOI to check a publication record, or confirming an institution's ROR ID for a funder submission.
Guides
RDA PID Kernel Information: Embedding Machine-Actionable Metadata in the PID Record
The RDA Recommendation on PID Kernel Information (2019) defines how to embed a small, stable, publicly available set of attributes directly inside a persistent identifier record, so software can make decisions without first resolving the PID and fetching a separate metadata record. This guide explains the principle, the recommendation itself, and how it underpins FAIR Digital Objects and the PID graph.
FAIR Signposting Profile: HTTP Link Headers for PID, Metadata, and Content Discovery
How the FAIR Signposting Profile uses typed HTTP Link headers to make persistent identifiers, metadata, and content on repository landing pages discoverable by machines, without HTML scraping.
DataCite Commons: Searching the PID Graph Across DOIs, ORCID, and ROR
How to search DataCite Commons for works, people, organizations, and repositories connected across the PID Graph of DOIs, ORCID iDs, and ROR IDs.
Wikidata as a PID Hub for Research Entities: QIDs Alongside ORCID, ROR, and ISNI
Wikidata’s QIDs are not a fifth PID registry competing with ORCID, ROR, and ISNI. Here is how its open, crowdsourced property model actually cross-references those authoritative registries, and where it helps versus where it can’t substitute for them.
Darwin Core occurrenceID: Persistent IDs for Specimens
How Darwin Core’s occurrenceID uniquely and persistently identifies individual biological and museum specimen records within GBIF, and why that granularity matters for biodiversity-data reuse.
CIÊNCIAVITAE: Portugal’s National Researcher CV and Identifier Platform
CIÊNCIAVITAE is FCT’s national platform for a standardized Portuguese researcher CV, tied to Ciência ID, mandatory for FCT funding calls since 2019, and synchronized with ORCID.
IdRef: France’s National Researcher Identifier and Its ORCID/ISNI/VIAF Links
IdRef is ABES’s national authority-identifier system for French higher education and research, linking researcher and institution records across Sudoc, HAL, and international identifiers including ORCID, ISNI, VIAF, and Wikidata.
GND (Gemeinsame Normdatei): Germany’s Integrated Authority File and Its Bridge to ORCID and Wikidata
GND (Gemeinsame Normdatei) is Germany’s integrated authority file, run by the DNB, that identifies researchers and organizations and links to ORCID and Wikidata.
e-Rad Researcher Number: Japan’s Cross-Ministerial R&D Management System Identifier
e-Rad (府省共通研究開発管理システム) is Japan’s cross-ministerial R&D management system. This guide explains its researcher number identifier, how it’s assigned, and its role across MEXT, JSPS, JST, and other national funding agencies.
Lattes Platform: Brazil’s National Researcher CV and Identifier System
What the Lattes Platform is, how CNPq maintains Brazil’s national researcher CV and identifier system, why it’s near-mandatory for Brazilian academic and funding processes, and how it relates to ORCID.
The Handle System: The Resolution Infrastructure Behind Every DOI
The Handle System is the resolution infrastructure DOI is built on top of — governed by the DONA Foundation (formerly CNRI), it resolves identifiers through a distributed Global Handle Registry, Multi-Primary Administrators, and Local Handle Services.
VIDWAN: India’s National Expert Database and Researcher ID (INFLIBNET)
VIDWAN is India’s national database of expert and researcher profiles, developed and maintained by INFLIBNET (a UGC-affiliated centre). This guide covers what it does, how registration works, and how it relates to ORCID.
ORCID Trust Markers: Institution-Asserted Affiliations and Verified Email Domains
ORCID Trust Markers distinguish institution-verified affiliations and verified email domains from self-asserted profile data. This guide covers how institution-asserted affiliations flow through the ORCID Member API and Affiliation Manager, how verified email domains work via ROR, and why the distinction matters for institutional research visibility and CRIS data quality.
Scholix: The Framework for Linking Publications and Datasets
Scholix is the RDA/WDS-originated interoperability framework that lets DataCite, Crossref, and OpenAIRE exchange machine-readable links between publications and datasets. This guide explains the information model, governance, and what CRIS managers and repository operators need to do to be part of it.
FAIR Digital Object (FDO): The Emerging Machine-Actionable PID and Metadata Framework
FAIR Digital Objects (FDOs) bind data, machine-actionable metadata, a type definition, and a resolvable PID into one interoperable unit. This guide explains the FDO model, the Digital Object Interface Protocol (DOIP), who is building it (FDO Forum, DONA Foundation, GO FAIR, RDA), and how it relates to existing PID and CRIS infrastructure.
ISNI Explained: What It Is and How It Differs From ORCID
ISNI is the ISO 27729 identifier for any public identity, covering individuals and organizations across research, publishing, and creative industries. Learn how it differs from the researcher-specific ORCID iD, how the two interoperate, and how to look one up.
How to Link ORCID to SciENcv for NIH Biosketches
A step-by-step walkthrough for connecting an ORCID iD to both eRA Commons and My NCBI/SciENcv, the two linked-account checks NIH now requires before a Biographical Sketch, Current and Pending Support, or Biographical Sketch Supplement can pass Common Forms submission validation.
DMPTool’s ROR and Funder Registry Integration: What Auto-Fills in Your DMP
DMPTool matches your institution and funder against the ROR and Crossref Funder Registry identifier systems. Here’s exactly what that integration auto-fills, what’s confirmed versus unconfirmed, and why the identifiers matter beyond convenience.
Why ORCID Auto-Update Isn’t Working: A Troubleshooting Guide for Crossref and DataCite
ORCID auto-update from Crossref or DataCite not adding your works? A step-by-step diagnostic checklist covering trusted-party permissions, missing ORCID iDs in deposits, stuck notifications, timing delays, and visibility settings.
Author Name Disambiguation: How ORCID, Algorithmic Matching, and CRIS Systems Resolve Identity Collisions
How ORCID’s claimed persistent identifier, algorithmic name-matching in Scopus and Web of Science, and CRIS person records each solve author name collisions differently—and how they work together in practice.
How to Link Your Scopus Author ID to Your ORCID Record
Connecting a Scopus Author ID to an ORCID record is a five-minute step, but it’s not the always-on automatic sync many assume. Here’s the documented Connect to ORCID process, what happens with duplicate Scopus profiles, and how to troubleshoot it.
How ROR, ISNI, Ringgold, and GRID Cross-Reference Each Other
How ROR, ISNI, Ringgold, and GRID actually map to each other: what ROR’s external_ids schema formally supports, why Ringgold needs an ISNI or Wikidata bridge, and practical lookup workflows for research administrators.
RRIDs Explained: Citing Antibodies, Model Organisms, and Software So They’re Findable
How to find, register, and cite RRIDs for antibodies, cell lines, model organisms, and software in a methods section, and why journals increasingly ask for them.
OCLC WorldCat Institutional Identifiers and CRIS Records
What OCLC Symbols, WorldCat Registry IDs, and ISIL codes are, how the WorldCat Registry works, and how (and how not) they relate to CRIS institutional-identity records.
ARK Identifiers Explained: Persistent IDs Beyond DOI, ORCID, and ROR
What ARK (Archival Resource Key) identifiers are, who governs the specification via the ARK Alliance, how they differ from DOI in cost and registration, and where research administrators actually encounter them.
ORCID Profile Optimization for Research Discoverability
How to configure an existing ORCID record for real discoverability: profile completeness, deliberate visibility settings, Crossref/DataCite auto-update, and featured works.
How to Add Google Scholar Publications to Your ORCID Profile
There is no automatic sync between Google Scholar and ORCID. This guide walks through the two real methods researchers use to move publications from a Google Scholar profile into an ORCID record: BibTeX export/import and the DOI-based Search & Link wizards, plus the duplicate and metadata pitfalls to check for afterward.
DOI Registration Agency: What It Is and Why the DOI System Is Federated
A DOI Registration Agency is an organization licensed by the International DOI Foundation to assign DOI prefixes, accept metadata, and guarantee resolvability. Twelve RAs currently operate, including Crossref, DataCite, mEDRA, JaLC, and the Korean DOI Center, each scoped to a content type or region.
Identifier Crosswalk: Connecting DOI, ORCID, ROR, and Institutional IDs in Practice
A practical, systems-level look at how DOI, ORCID, and ROR identifiers actually link in real Crossref/DataCite metadata records, how an institutional CRIS resolves and cross-references them, and the specific points where the crosswalk most often breaks.
Persistent Identifier Federation Across Research Infrastructure
How DOI, ORCID, ROR, and RAiD registries interconnect through the PID Graph and current RDA/NISO standards work, and why machine-actionable federation matters for research administration.
Persistent Identifiers and Citation for AI Models and Training Datasets
How to mint a persistent identifier for a trained AI model or training dataset, what a model card needs to document to make that identifier meaningful, and why both matter for provenance, reproducibility, and research credit.
How to Register, Find, and Search for ORCID iDs: A Practical Guide
A practical, task-focused walkthrough of registering an ORCID iD, recovering one you forgot, searching the public registry for someone else’s, and connecting ORCID to NIH, NSF, and institutional CRIS systems.
How to Find, Cite, and Use a DOI (Digital Object Identifier)
A practical guide to finding a DOI (digital object identifier) for an article, dataset, or book, resolving it via doi.org, and citing it correctly in APA, MLA, Chicago, Vancouver, and IEEE style.
