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.

Crossref’s Board votes to adopt the Principles of Open Scholarly Infrastructure


On November 11th 2020, the Crossref Board voted to adopt the “Principles of Open Scholarly Infrastructure” (POSI). POSI is a list of sixteen commitments that will now guide the board, staff, and Crossref’s development as an organisation into the future. It is an important public statement to make in Crossref’s twentieth anniversary year. Crossref has followed principles since its founding, and meets most of the POSI, but publicly committing to a codified and measurable set of principles is a big step. If 2019 was a reflective turning point, and mid-2020 was about Crossref committing to open scholarly infrastructure and collaboration, this is now announcing a very deliberate path. And we’re just a little bit giddy about it.

Here is a picture of me being “giddy.”

If you just want to see the principles that the board has endorsed, you can see them here:

But if you also want some background and want to understand some of the implications of Crossref adopting the principles, read on…

Warning - this is a long post.

Helping researchers identify content they can text mine

Geoffrey Bilder

Geoffrey Bilder – 2020 April 16

In MetadataCommunityAPIs

TL;DR Many organizations are doing what they can to aid in the response to the COVID-19 pandemic. Crossref members can make it easier for researchers to identify, locate, and access content for text mining. In order to do this, members must include elements in their metadata that: Point to the full text of the content. Indicate that the content is available under an open access license or that it is being made available for free (gratis).

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.

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 (neĂ© 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.