According to the regulations of doctoral schools in the University of Gdańsk, Appendix to the Resolution of the Senate of the University of Gdańsk no. 86/19 as amended, section 7 paragraph 3, entitled “Doctoral students responsibilities”, doctoral students are obligated to obtain a researcher’s digital identifier (an ORCID iD), which may be done here: https://orcid.org/.
Instructions of registration can be found below.