VideoChain: Trusted Video Surveillance Based on Blockchain for Campus

We are living in the age that crisis events happen everywhere and every day. Video evidence plays an important role in restoring the truth of the incident. The credibility of video evidence is gradually declining. On the one hand, the credibility of the government has been questioned. On the other hand, malicious attackers will distort the video and publish it on the Internet to mislead public. Inspired by the blockchain, this paper proposes a model based on blockchain to ensure the credibility of video evidence, which is called VideoChain. VideoChain is essentially a blockchain system, but different from digital currency such as Bitcoin. It records the hash of the surveillance video. This paper takes the campus Video Surveillance as an example to describe the architecture and operation of VideoChain. We also give a consensus protocol based on the proof of stake according to the application scenario. The analysis shows that VideoChain is traceable and non-tampering, which can effectively ensure the credibility of video surveillance data. It also has good operational efficiency. This research is of great significance to enhance the trust between the government and citizens, which will improve the credibility of the government.