Theme Article: Special Section on Advances in Smart Cities Decentralized Video Input Authentication as an Edge Service for Smart Cities Ronghua Xu, Deeraj Nagothu, and Yu Chen Binghamton University Abstract-Situational awareness is essential for a safe and sustainable urban environment. While the wide deployment of Internet of Video Things (IoVT) enables efficient monitoring of the footage of the Smart Cities, it also attracts attackers and abusers. Disinformation injected into the IoVT can mislead the city administrations, policy makers, and emergency responders, and lead to disastrous consequences. It is very challenging to timely authenticate each video stream from pervasively deployed IoVT devices. This article presents a Blockchain Enhanced Video input Authentication (BEVA) scheme as an edge service to fight against the visual layer attacks on smart IoVT systems such as online false video injection and offline video streams tampering attacks. The BEVA scheme leverages the electrical network frequency (ENF) embedded in video recordings as an environmental fingerprint for online false frame detection. Blockchain is integrated to enable a decentralized security networking infrastructure, and it empowers an immutable, traceable, and auditable distributed ledger for ENF-based authentication scheme without relying on a third-party trust authority. This secure-by-design solution efficiently provides trust and secure services in IoVT in modern Smart Cities. Digital Object Identifier 10.1109/MCE.2021.3062564 Date ofpublication 26 February 2021; date ofcurrent version 6 October 2021. & THE FAST ADVANCEMENT in artificial intelligence (AI) and the Internet-of-Things (IoT) technologies brings the concept of " Smart Cites " into practice. With the exponential increase in the number of smart Internet-of-Video-Things (IoVT) 76 2162-2248 ß 2021 IEEE Published by the IEEE Consumer Technology Society IEEE Consumer Electronics Magazine