Getting ORCIDs by DOI Is there a web service that retrieves all of the ORCIDs for the authors associated with a DOI?  I've looked at crossref.org, but I can't seem to find information on how to do this with their service.

I am currently using their HTTP-based API to query information about a publication given its DOI.  It returns the names of the authors, but not their ORCIDs.

(An ORCID (Open Researcher and Contributor ID) is a unique identifier for an author of a publication.
A DOI (Digital Object Identifier) is the same thing, but for the publication itself)
For biomedical publications it is possible to do using Europe PMC API (I work for this database). You can query the database using the DOI like this and extract (authorId type="ORCID") field. Here is the same query using JSON is you prefer.