One of the main challenges we faced was ensuring a stable power supply for our solar-powered nodes, especially during periods of low sunlight. To overcome this, we developed a robust energy storage system that efficiently manages power consumption and reserves. Another challenge was optimizing lightweight blockchain clients like Helios for Ethereum to run on limited-resource hardware such as Raspberry Pi 400. Additionally, integrating multiple blockchains, including Ethereum and Polygon, posed compatibility issues that we resolved through careful configuration and iterative development. These challenges pushed us to innovate and refine our approach, ultimately leading to a more resilient and efficient solution.TBA