Autonomous vehicles (AVs), drones, and other types of robots will revolutionize our way of traveling and understanding urban space. In order to operate, all of these devices are expected to collect, analyze, and share sensitive data about our daily activities. However, current approaches of handling these datasets relies on centralized models (e.g., corporate databases, cloud-based services, etc). Recently, it has been shown that the security and privacy-preserving capabilities of these centralized models present significant challenges for future deployments. For this reason, this project proposes BASIC, the Blockchained Agent-based Simulator for Cities. This tool aims to verify the feasibility of using blockchain as a communication layer between agents (e.g., citizens, robots, etc.) in simulated urban scenarios. In order to test the proposed tool, we propose a car-sharing scenario populated with AVs within the city of Cambridge (Massachusetts, USA).