## 2 Data Network Infrastructure for HSS  
Following the acquired knowledge on previous works on a services enabler architecture for smart grid and smart living services providers under industry 4.0 [28], an added step into Industry x.0 [29, 30] is proposed with an innovative Data Network Infrastructure for HSS (DNIHSS) for Large Geographical Area Aerial Surveillance Systems. The DNIHSS supports several HSS from independent private and public companies in the same infrastructure. For large geographical area surveillance systems, the DNIHSS is supported by several autonomous tethered aerostat airships (ATAA). The ATAA work autonomously, supported by AI services, offering an aerial platform for the integration of wireless data network nodes called Data Network Infrastructure Blocks (DNIB), which are linked in a meshed fashion way to provide a wireless data network to support several sensors, actuators, and services. Several large wing gliders or aerostat airships designs exist in the market [31, 32, 33], and different layouts are to be tested in future works. Two examples of such shapes are shown in Figures 1 and 2. Figure 1: ATAA large wing glider shape. Although all ATAA rely on buoyant gas to float, in some environments, the use of lift forces of a wing and the control of a tail to govern the ATAA position may be necessary. So, several shapes are to be considered depending on the installation environment or portability needs. The ATAA wireless data network nodes mesh is connected to one or more Ground Connection Points (GCP) installed in one or more geographical areas or over a satellite, which provide a point of connection to the DNIHSS Network Managing Services (NMS). The NMS are responsible for managing the DNIHSS infrastructure's operation and security. The NMS also interconnects the HSS modules in its network to its corresponding managing systems in the cloud. Several goals were determined for the proposed DNIHSS and its components in order to ensure independence and security to the supported HSS:  
* Service type agnostic;
* Hardware and software agnostic;
* Support for several HSS at the same time;
* Security and independence of HSS services;
* Separate operability from maintenance/operation and HSS services;
* Automation of maintenance and operation tasks;
* Simplicity of components and services implementation, maintenance, and substitution;
* Separation of concerns on services and components;
* Visibility and transparency over maintenance/operation to assure the HSS services security. To ensure visibility and transparency over operation, maintenance, and security, a Blockchain system is implemented. The Blockchain is an architectural concept that offers open, secure, and distributed ledger transactional validation and verification. The entire ledger can record transactions between parties efficiently and in a verifiable and permanent way. In the DNIHSS, the Blockchain is a multi-party collaboration of software, hardware vendors, service operators, and network operators. The interoperability of these independent ledgers in transactional verification guarantees the transparency of all the operations, maintenance, and governability of the DNIHSS. It guarantees the transactions' immutability, security, transparency, and auditability. This foundation for building transactional applications that establish trust and transparency while streamlining the DNIHSS processes and services offers security to services operator supported by the DNIHSS. There are two types of DNIHSS: Permanent Installation (PI) and Temporary Installation (TI). In a PI, the ATAA are anchored in a static anchor platform. In a TI, the anchor platform is mobile and distributed as needed in geographical areas that only need the temporary installation of a DNIHSS. Two examples of the offered DNIHSS using ATAA are presented in Figures 3 and 4. Figure 2: ATAA blimp shaped.