[{"constant":true,"inputs":[{"name":"broker","type":"address"},{"name":"orderHash","type":"bytes32"}],"name":"isOrderHashRegistered","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"orderHash","type":"bytes32"}],"name":"registerOrderHash","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]