Table 2. Illustrates the research questions.
| Research questions | Motivations/Objectives |
|---|---|
| What are the applications and types of UAVs? | To know about the applications and types of UAVs. |
| What are the challenges of UAVs in smart cities? | To know about the different types of challenges of UAV-based systems in smart cities. |
| What are the solutions to key challenges with the of integration blockchain with UAVs? | To know about the solution to these challenges related to blockchain integration with UAVs. |