Canada was up-front in political and technical support. The Court can be established after signature has been followed by formal ratification by 60 countries. The Court will have jurisdiction over genocide, war crimes and crimes against humanity. It may eventually also handle some forms of aggression, to be determined later by the ratifying States. It will try individuals, maximum sentence life in prison.
States have first go at prosecution.
If they can't or won't, the International can. This is a streamlined summary. It will be a few years before this Court begins operating. A strong and sophisticated citizens NGO network made a significant contribution to getting the Convention adopted in Rome. This is recognized in the open door for continued NGO participation in the Preparatory Commission.