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

def initial_security_hash(self, 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)
