struct GuardConstState {
  bytes tokenScript;
  int[6] inputTokenAmountArray;
}

library GuardProto {
  static function stateHash(GuardConstState _state) : bytes {
    bytes inputOutpointAll = _state.tokenScript;
    loop (6) : i {
        inputOutpointAll += pack(_state.inputTokenAmountArray[i]);
      }
    return hash160(inputOutpointAll);
  }
}