Blockchain Smart City Framework

I need a lightweight blockchain framework for smart city applications, implemented using iFogSim. The architecture should be three-layered: users/sensors/devices, fog nodes, and cloud. Incorporate interconnected fog node communication and secure transactions via blockchain.

Essential Features:
- Transaction logging
- Data privacy
- Consensus mechanisms

Ideal Skills and Experience:
- Expertise in blockchain technology
- Experience with iFogSim
- Proficiency in Java
- Knowledge of fog computing and cloud architecture