Open Researcher and Contributor ID (ORCID) is an independent and the most widely used system that aims to create a single author registry. ORCID can thus be linked to other ResercherID/Publons identifiers (Web of Scinece database) and Scopus Author ID (Scopus) by default.

The principle of ORCID, short video here.
ORCID homepage here.
Where to get an ORCID identifier? Registration form.
A fictitious profile from ORCID can be found here.

Bc. Jiří Mašek