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A proof of concept for secure offline mobile payments: peer-to-peer transfers over NFC that work without internet connectivity, on Android and iOS.
Fintech · Offline mobile paymentsPayments that work without the internet.
Moneytak wanted to validate a unique approach to offline payments: secure peer-to-peer transactions between mobile devices, conducted without internet connectivity while maintaining transaction integrity and security.
Sender Sending −€25.00 NFC Receiver Received +€25.00 No internet needed Encrypted & dual-signed Syncs on reconnect Illustrative offline transferA comprehensive solution on a modern stack.
Our team designed and implemented a comprehensive solution using a modern tech stack and innovative approaches to solve these challenges:
The team chose React Native for cross-platform mobile development, ensuring a consistent user experience across both Android and iOS devices.
The backend was built using Java Spring Boot, providing a scalable and secure foundation for transaction processing and user management.
For offline transactions, we implemented a sophisticated NFC-based communication system using Host Card Emulation (HCE) services
Developed a secure local storage system using encrypted flash memory to store transaction data and encryption keys
Implemented a dual signature system using one-time keys for enhanced security
Created a robust synchronization mechanism for processing offline transactions when devices reconnect
Everything a secure wallet needs, online or off.
Secure offline peer-to-peer transfers using NFC Local encrypted storage for transaction data Real-time balance updates and transaction history Biometric authentication for secure access Virtual card payments integration Automatic synchronization of offline transactions Comprehensive transaction validation systemSecure offline payments, proven feasible.
The PoC successfully demonstrated the feasibility of secure offline mobile payments, particularly the innovative NFC-based transaction system. The client was able to validate their unique approach to offline payments, proving that secure peer-to-peer transactions could be conducted without internet connectivity while maintaining transaction integrity and security.
The project showcased several technical achievements Successful implementation of offline-to-offline data transfer Secure local data storage and encryption Efficient synchronization mechanism User-friendly interface for complex financial transactions
