## 3 Prototype Description and Implementation  
The system put forward in this manuscript comes with several advantages compared to the reviewed literature, as it can be inferred from the contributions that were described in Section 1.1. These advantages are as follows:  
1. Cybersecurity implementations. In most of the reviewed proposals cybersecurity has not been considered as a serious requirement at any stage of the development, even when sensitive information about living beings or locations was collected. Our proposal integrates specific security solutions derived from the components that have been chosen to build the required subsystems and how they have been integrated. 2. Tailored development. Many of the proposals that have been described do not consider the specific needs of the environment of smart farming (distances from one place to another, easiness to repair damaged components, First Person View or FPV of cattle, enhanced radio control subsystem, etc.). As it will be explained in further sections of the paper, the subsystems that our proposal consists of are built according to the feedback obtained by farmers that work with sheep and the foodstuffs derived from them, so the proposed system is also making use of the information obtained from experts in this area of knowledge. 3. Subsystems built for integration. In most of the reviewed proposals, there is no clear information of the components used to build the UAV (partially since most of them offer commercial, closed solutions from manufacturers) or any other systems that are used in a supportive role. We have described not only such subsystems, but also have explained each of the components used to build them internally, so the technological foundations of the presented CPS are crystal clear. The advantages that this proposal offers compared to the reviewed literature has been depicted in Table 2. The technologies used to obtain an advantage over the existing literature have been made explicit in the rightmost column of this table. In addition to Table 2, Table 3 shows a comparative analysis on the advantages that our proposed solution offers when compared to the ones that have been reviewed in Section 2. It must be noted that some of the previously reviewed solutions fall out of the scope of the paper, and others might be directed towards other kind of goals. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Open Issue** & **Proposed Solution** & **Means Used for the Solution** \\ \hline Lack of focus on & Incorporating components & Usage of security-enabled \\ cybersecurity implementation & and protocols with & wireless communication \\ security capabilities & security capabilities & protocols, blockchain and \\ IPFS for data distribution & Building the UAV used from & IPSF for data distribution \\ Lack of UAV tailoring for the purpose of cattle monitoring & Sexth according to the & Usage of components that enable FPV within the range of kilometers \\ Lack of description in & Usage of components that can & Description of the subsystems and the components that have been implemented/mounted \\ hardware and software component interweaving & Sexth without difficulty & Sexth to create them. \\ and integration & Sexth & Sexth \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Advantages of the proposed system compared to the open issues identified.