overview of ways to enhance the security of video surveillance networks using blockchain

In recent decades, video surveillance systems have an increasing development that are used to prevent crime and manage facilities with rapid diffusion of  (CCTV)cameras to prevent crime and manage facilities. The video stored in the video surveillance system should be managed comfortably, but sometimes the movies are leaking out to unauthorized people or by unauthorized people, thus violating individual boundaries . CCTV cameras and video surveillance systems are needed today because of the increasing number of crimes, These cameras and video surveillance systems. but because of unsafe storage and data sharing methods, access to movies saved by unauthorized people is possible. The use of existing protocols and security techniques has already been defeated several times by the attackers. It requires an alternative system that should not only be highly secure but not changeable. Video stream generated by surveillance cameras play a crucial role in preventing crime in smart cities. CCTV cameras are necessary for a range of public applications in a smart city; they can become smart sensors that help ensure safety and safety. in this paper, we review the methods and articles presented in the context of blockchain application in visual surveillance systems and compare them.