This service provider receives an identifier for you known as an eduPersonPrincipalName (or eppn) from your login provider. Within GraceDB, this eppn functions as your username. If you are outside the LIGO/Virgo community, the eppn is also used to look you up in the Gravitational Wave Astronomy Community Registry to find your group membership information (which determines read and edit permissions). None of this information about you is shared with any service or tools outside of those supporting collaboration across the gravitational wave astronomy community.