BitSignal

Inspiration

When natural disasters or conflicts hit, communication and money flow often collapse — people can’t ask for help or receive aid easily. I was inspired to create a tool that works even when the internet or banks are down. Using Bitcoin’s Lightning Network combined with offline mesh networks felt like a perfect fit to build a censorship-resistant, decentralized SOS and aid platform.

I wanted to show how Bitcoin can do real-world good beyond trading — saving lives, helping people in crisis instantly and directly.

What it does

BitSignal lets users send and receive emergency alerts offline via mesh technologies like Bluetooth or LoRa. People in trouble can broadcast SOS messages (like "need water" or "injured") even without the internet. Donors worldwide can instantly send Bitcoin micropayments via Lightning to those SOS signals. NGOs and helpers get real-time, verified alerts on a map to respond faster. It’s like a decentralized rescue network powered by Bitcoin and offline tech.

How we built it

I built this project using React with TypeScript for a robust and type-safe frontend experience. The UI components are styled with Tailwind CSS, which makes it easy to create responsive and modern designs. For the interactive parts like buttons and maps, I used a combination of custom components and popular libraries to ensure smooth performance and usability.

The project is bundled and served using Vite, which provides fast development builds and hot module replacement. I also integrated some handy tools for state management and UI feedback to make the app feel responsive and polished.

Technologies Used

React with TypeScript Tailwind CSS for styling Vite as the build tool and development server Radix UI components for accessible and customizable UI elements Lucide React for icons React Query for data fetching and state management Various utility libraries like clsx and date-fns

Challenges we ran into

• Mesh network reliability varies widely — it’s tough to keep messages flowing smoothly offline.

• Integrating Lightning payments in a way that’s seamless but secure took a lot of trial and error.

• Handling photo/video proof verification while keeping user identities pseudonymous was tricky.

• Making the UI clear and simple enough to use in stressful situations but still feature-rich was a challenge.

• Balancing privacy, decentralization, and data persistence required creative backend solutions.

Accomplishments that we're proud of

• Built a fully functional offline SOS messenger combined with Bitcoin Lightning payouts.

• Created a secure, pseudonymous way to verify and timestamp disaster alerts.

• Designed a real-time map of verified needs, helping rescuers prioritize aid.

• Demonstrated how Bitcoin’s Lightning Network can drive real, life-saving use cases beyond speculation

What we learned

Bitcoin is more than money; it can be a powerful tool for decentralized humanitarian aid.

What's next for BitSignal

-- Add voice-activated SOS and wearable sensor integrations for “proof of distress.”

-- Implement AI-powered photo verification to speed up aid approvals.

-- Expand aid routing to auto-match victims with nearby donors and NGOs.

Built With

• bitcoin-lightning-network
• javascript
• map
• pouchdb
• rust
• sqlite
• supabase
• typescript