Wikisource:ORCID
ORCID iDs are identifiers for authors and other content creators.
Anyone, including Wikisource editors, can register for their own ORCID iD.
ORCID iDs can be displayed on Author: or User: pages, by using {{Authority control}}. For Author: pages, it will call values from Wikidata's Property:P496.
For more details, see en:Wikipedia:ORCID, or contact ORCID's Wikimedian in Residence, Andy Mabbett