DOI (Digital Object Identifier) are assigned to journal articles, datasets, software, images and other research outputs. The DOIs enables it to be linked to an author profile like ORCiD.
ORCID (Open Researcher and Contributor Identifier) provides you with a unique, 16-digit ID.
It is a lifelong digital identifier
Scopus Author ID is automatically generated if you have an article indexed by Scopus.
With Scopus Author ID you can:
A Researcher ID is generated if you have at least one publication indexed in the Web of Science.
You can create your own profile using Researcher ID on Publons.
In Publons you can:
For further information on creating and maintaining profiles see Researcher Profile