docs: 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)