Fantom is a distributed ledger technology stack. At its foundation, it is a DAG-based distributed ledger incorporating new methods of scalability, combined with a high-performance virtual machine and safe, secure smart contract execution. FANTOM DAG platform is uniquely positioned to become the IT infrastructure backbone for smart cities. With the ability to collect large quantity high speed data transmission with scalable solutions across multiple smart city service providers. By 2020 it is estimated that smart cities will have 90 Billion IoT devices sending data that needs to be stored securely whilst also being accessible to stakeholders for smart city data-driven smart contracts and decentralized applications.