Are there two versions of the European Student Identifier (ESI) now? Why? And which one do I need for Erasmus Services?

The European Student Card (ESC) project did pilot the initial version of the ESI. The MyAcademicID project partners have considered the use cases and requirements for such an identifier and agreed upon new specifications for the ESI to make it future-proof and speed-up uptake by the higher education community. The specifications of this new ESI format are defined in the blueprint architecture document and are the ones to be used for the Erasmus services. The platform implementing the ESC agreed to strive for the adoption of the new format after going through a transition phase. Eventually, higher education institutions will be asked to issue only one identifier per student for the different platforms/networks.