[{"constant":true,"inputs":[{"name":"hash","type":"string"}],"name":"getBlockNumber","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"hash","type":"string"}],"name":"write","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]