Hi, Felipe
I am also a PhD student. Here is the
quote from the
Rules:
6. Students.
6.1 Eligibility.
(a) Requirements. To participate in the Program, a Student must:
(i) be eighteen (18) years of age or older upon registration for the Program;
(ii) be enrolled in or accepted into an accredited institution, including a college, university, masters program, PhD program and/or undergraduate program, as of the Acceptance Date;
So, it is not forbidden for PhD students to take part in the CSoC. Nevertheless, there are other terms and conditions in the Rules which you have to check.