With Germany's largest international smart city startup challenge, the Ruhr Metropolis - City of Cities - is calling start-ups from across the globe to apply and solve the real-world challenges of four cities: Bochum, Bottrop, Hagen and Gelsenkirchen through a paid pilot. The application deadline has been extended due to the COVID-19 pandemic until May 3, 2020. In the following paragraphs, we will look more closely on the Bottrop and Gelsenkirchen challenges.

When it comes to public safety, smart city leaders recognize the importance of engaging with citizens and encouraging them to report safety problems. In this article, we present a perspective on public safety — and focus on Vizsafe, a U.S. startup firm which discovered opportunities to incentivize citizens and improve safety by creating a platform which connects the power of crowdsourcing and smartphone technologies with a blockchain-based rewards system.