Generate the initial security hash from self.content_object
        and a (unix) timestamp.

def initial_security_hash(self, timestamp):
        """
        Generate the initial security hash from self.content_object
        and a (unix) timestamp.
        """

        initial_security_dict = {
            'content_type': str(self.target_object._meta),
            'object_pk': str(self.target_object._get_pk_val()),
            'timestamp': str(timestamp),
        }
        return self.generate_security_hash(**initial_security_dict)