def extract_secs(self, tx, tx_in_idx):
        """
        For a given script solution, iterate yield its sec blobs
        """
        sc = tx.SolutionChecker(tx)
        tx_context = sc.tx_context_for_idx(tx_in_idx)
        # set solution_stack in case there are no results from puzzle_and_solution_iterator
        solution_stack = []
        for puzzle_script, solution_stack, flags, sighash_f in sc.puzzle_and_solution_iterator(tx_context):
            for opcode, data, pc, new_pc in self._script_tools.get_opcodes(puzzle_script):
                if data and is_sec(data):
                    yield data
            for data in solution_stack:
                if is_sec(data):
                    yield data
For a given script solution, iterate yield its sec blobs