## 5 Conclusions and Future Works
Blockchain as a way to store multimedia information collected from UAVs in a distributed manner is, at the moment of composing this manuscript in the application domain of agriculture, a technology that has not been used to a significant extent. It provides features that are desirable for end users at farms, like data redundancy, immutability transparency that are hard to provide combined in a reliable manner. It has been previously justified, along with the other used technologies, why the addition of blockchain is a suitable idea, and how it can provide benefits to any farmer looking to prove that their cattle have been well-treated, the same way that blockchain is used in developments related to the production of foodstuffs in the supply chain and other manufacturing procedures. 3. Usage of IPFS for information sharing at the data level. In order to enhance security and availability of the data shown, an infrastructure to share the files containing blockchain information has been provided, so that once the information added is verified and validated (which is done by the consensus algorithm used in the blockchain development) can be shared among a plethora of participants in a fully decentralized manner and without requiring any centralized repository that would question the legitimacy of the decentralization of the system (if the information provided is kept in a repository controlled by a single party, regardless of what kind of data structure is used to save the information). Usage of IPFS is unknown to us in the context that this manuscript describes. 4. Lastly, this list of functional and non-functional requirements (as depicted in Tables 4 and 5 and developed in Table 6) establishes a starting point for similar deployments that can be reused for application domains that are comparable to the one that has been presented here. The advantage of having this list to give design and implementation for hardware and software components should not be underestimated. It was also proven that through the image offered to the operator by the camera on board the UAV, it is possible to control the facilities of the livestock farm and its status. For example, a farmer can see if the animals have water in the drinkers and food in the feeders. Controlling the state of the salt stones scattered on the farm used by the animals to get additional minerals can be done by using the UAV as well. Finally, using IPFS/blockchain as the means of information storage is useful to provide timestamped information that, with the consensus algorithm used, would require the spurious party to modify such a significant number of blocks that it could not go unnoticed, thus providing another tool for the assessment of cattle living conditions that ensures that the provided multimedia information is authentic and legitimate. Although the tests had favorable results, there are still some challenges that could be proposed as future works. In the first place and considering the reviewed literature, the animals will diminish their reaction to this stimulus after a prolonged exposure; while that would be good for purely monitoring activities (they will behave in a more natural way) it will make harder controlling the herd by just using the UAV. Another of the challenges to consider is the difficulty that the UAV operator may have to face when trying to handle it in weather conditions that are not as favorable as those of the days on which the tests were carried out. Although using a regular UAV during rain is generally discouraged, it would be necessary to study how the wind or fast temperature changes can affect the flight, and up to what speed of sudden drifts of wind the UAV can maintain its stability. While IPFS provides an additional layer to make data tampering or alteration more difficult, its dependence on the number of online peers to be effective is still an issue.