SigText

Dahsboard
QR code scanner
Testnet connect
Supabase connection test
Organization List
Add organization
Message List
Setting Screen

🧠 Inspiration

With SMS phishing attacks costing over $12.5 billion annually, we saw a major gap in how users verify the authenticity of messages. People are bombarded with links and codes from banks, ecommerce platforms, and health agencies — but have no idea if they’re real or not.

I was inspired to create a privacy-first solution where users could verify messages without ever revealing personal data, using blockchain and AI — and that's how SigText was born.

🔍 What it does

SigText is a decentralized Web3 mobile first message verification platform that lets users:

✅ Verify signed SMS messages and QR codes
✅ Get real-time verification via blockchain
✅ Hear verification results through natural voice feedback
✅ Use the app offline — privacy is never compromised

No accounts, no data collection, no middlemen — just instant trust.

🛠️ How I have built it

I have built SigText entirely using Bolt.new, which enabled us to go from prototype to production quickly.

Technology Stack:

Frontend: React Native (Expo), TypeScript, Expo Router
Backend: Supabase for real-time data and auth
Blockchain: Algorand via Nodely.io for cryptographic checks
Voice AI: ElevenLabs for accessibility & feedback
Security: Row-Level Security (RLS), no PII storage, end-to-end encryption

The app is modular, scalable, and built with performance and accessibility in mind.

🧱 Challenges we ran into

🔐 Integrating cryptographic verification with a friendly UI
🌐 Learning how to interact with the Algorand blockchain efficiently
🧪 Testing real-time voice synthesis across various devices
🔄 Ensuring the system works offline without storing any sensitive user data

Every challenge pushed me closer to a more secure and inclusive product.

🏆 Accomplishments that we're proud of

✅ Built a production-ready, decentralized app in record time using Bolt.new
✅ Achieved zero-PII verification with end-to-end privacy
✅ Integrated voice feedback for accessibility (a first for message verification apps)
✅ Seamlessly connected blockchain, Supabase, and AI in one unified platform