The ORCID (Open Researcher and Contributor ID) has become the standard identification method used by researchers.
ORCID is a non-profit agency that provides a unique alphanumeric code used to identify scholars. ORCIDs are valuable because they connect all of a researcher’s output regardless of changes to the author’s name or affiliation. By having all of the scholar’s output linked together their output is more easily quantifiable. Anyone can create an ORCID for free.