Q: Passage: The key principle is that the Court only has jurisdiction on the basis of consent. The court has no true compulsory jurisdiction. Jurisdiction is often a key question for the Court, because it is challenged by the respondent. At the Preliminary Objections phase, a respondent may challenge (i) jurisdiction and / or (ii) admissibility of the case. Article 36 outlines four bases on which the Court's jurisdiction may be founded.

Question: Based on this passage, what is the contentious jurisdiction of the icj? Let's give stream of consciousness first:
The relevant information is: The key principle is that the Court only has jurisdiction on the basis of consent. Therefore, the final answer is jurisdiction on the basis of consent.