https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_gettransactionbyblockhashandindex

        :param bhash: Block hash
        :type bhash: str

        :param index: Index position (optional)
        :type index: int

def eth_getTransactionByBlockHashAndIndex(self, bhash, index=0):
        """https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_gettransactionbyblockhashandindex

        :param bhash: Block hash
        :type bhash: str

        :param index: Index position (optional)
        :type index: int
        """
        result = yield from self.rpc_call('eth_getTransactionByBlockHashAndIndex',
                                          [bhash, hex(index)])
        # TODO: Update result response
        return result