Geoffrey Bilder

Geoffrey Bilder has led the technical development and launch of a number of industry initiatives at Crossref, including Similarity Check (formerly CrossCheck), Crossmark, ORCID, and the Open Funder Registry (formerly FundRef). He co-founded Brown University’s Scholarly Technology Group in 1993, providing the Brown academic community with advanced technology consulting in support of their research, teaching, and scholarly communication. He was subsequently head of IT R&D at Monitor Group, a global management consulting firm. From 2002 to 2005, Geoffrey was Chief Technology Officer of scholarly publishing firm Ingenta, and just prior to joining Crossref, he was a Publishing Technology Consultant at Scholarly Information Strategies.

Read more about Geoffrey Bilder on their team page.

Accidental release of internal passwords, & API tokens for the Crossref system

TL;DR On Wednesday, October 2nd, 2019 we discovered that we had accidentally pushed the main Crossref system as part of a docker image into a developer’s account on Docker Hub. The binaries and configuration files that made up the docker image included embedded passwords and API tokens that could have been used to compromise our systems and infrastructure. When we discovered this, we immediately secured the repo, changed all the passwords and secrets, and redeployed the system code.

Underreporting of matched references in Crossref metadata

Geoffrey Bilder

Geoffrey Bilder – 2019 February 05

In APIsCitationMetadata


About 11% of available references in records in our OAI-PMH & REST API don’t have DOIs when they should. We have deployed a fix, but it is running on billions of records, and so we don’t expect it to be complete until mid-April.

Note that the Cited-by API that our members use appears to be unaffected by this problem.

Status, I am new

Hi, I’m Isaac. I’m new here. What better way to get to know me than through a blog post? Well, maybe a cocktail party, but this will have to do. In addition to giving you some details about myself in this post, I’ll be introducing our status page, too.

Redirecting redirection

Crossref has decided to change the HTTP redirect code used by our DOIs from 303 back to the more commonly used 302. Our implementation of 303 redirects back in 2010 was based on recommended best practice for supporting linked data identifiers. Unfortunately, very few other parties have adopted this practice.

Global Persistent Identifiers for grants, awards, and facilities

Crossref’s Open Funder Registry (neé FundRef) now includes over 15 thousand entries. Crossref has over 2 million metadata records that include funding information - 1.7 million of which include an Open Funder Identifier. The uptake of funder identifiers is already making it easier and more efficient for the scholarly community to directly link funding to research outputs, but lately we’ve been hearing from a number of people that the time is ripe for a global grant identifier as well.

To that end, Crossref convened its funder advisory group along with representatives from our collaborator organizations, ORCID and DataCite, to explore the creation of a global grant identifier system.

We thought you might like to know about what we’ve been discussing…

Taking the “con” out of conferences


Crossref and DataCite are forming a working group to explore conference identifiers and project identifiers. If you are interested in joining this working group and in doing some actual work for it, please contact us at and include the text conference identifiers WG in the subject heading.

Linking DOIs using HTTPs: the background to our new guidelines

Geoffrey Bilder

Geoffrey Bilder – 2017 January 17

In DOIsStandardsWeb

Recently we announced that we were making some new recommendations in our DOI display guidelines. One of them was to use the secure HTTPS protocol to link Crossref DOIs, instead of the insecure HTTP.

DOI-like strings and fake DOIs

TL;DR Crossref discourages our members from using DOI-like strings or fake DOIs. Details Recently we have seen quite a bit of debate around the use of so-called “fake-DOIs.” We have also been quoted as saying that we discourage the use of “fake DOIs” or “DOI-like strings”. This post outlines some of the cases in which we’ve seen fake DOIs used and why we recommend against doing so. Using DOI-like strings as internal identifiers Some of our members use DOI-like strings as internal identifiers for their manuscript tracking systems.

Distributing references via Crossref

Known unknowns If you follow this blog, you are going to notice a theme over the coming months- Crossref supports the deposit and distribution of a lot more kinds of metadata than people usually realise. We are in the process of completely revamping our web site, help documentation, and marketing to better promote our metadata distribution capabilities, but in the mean time we think it would be useful highlight one of our most under-promoted functions- the ability to distribute references via Crossref.

Members will soon be able to assign Crossref DOIs to preprints

Geoffrey Bilder

Geoffrey Bilder – 2016 May 05

In Preprints


By August 2016, Crossref will enable its members to assign Crossref DOIs to preprints. Preprint DOIs will be assigned by the Crossref member responsible for the preprint and that DOI will be different from the DOI assigned by the publisher to the accepted manuscript and version of record. Crossref’s display guidelines, tools and APIs will be modified in order to enable researchers to easily identify and link to the best available version of a document (BAV). We are doing this in order to support the changing publishing models of our members and in order to clarify the scholarly citation record.