In today’s world, most financial and personal transactions happen online. This makes data security a big concern. To address risks like data breaches, hacking, and identity theft, our project “Blockchain Secure Transaction” aims to create a dependable and decentralized system for secure digital payments.
The system uses blockchain technology to ensure transparency and immutability in each transaction, eliminating the need for a central authority. The process starts with user registration, where details are securely stored along with a picture password for better recognition. During login, users must pass both the picture password and a biometric check. This ensures that only the account. Once verified, the user enters the dashboard, where transactions begin through Zero-Knowledge Proof (ZKP) for privacy-preserving verification.
Every transaction is validated with smart contracts. If there’s any mismatch or automatically blocks or freezes the transaction.
The backend uses Java, while Firebase stores user data securely, and 2 factor.in enables OTP-based authentication. The frontend interface, designed in React (app.jsx), allows smooth navigation across pages. By combining blockchain, smart contracts, biometric authentication, and ZKP, this project provides a secure and user-friendly platform that prevents unauthorized access and builds user trust in digital payment systems
The Blockchain Secure Transaction system effectively exemplifies the application of blockchain technology in building a secure, transparent, and decentralized online financial platform. Through the combination of Zero-Knowledge Proofs (ZKP), smart contracts, biometric verification, and picture password authentication, the system provides a multi- layered security mechanism against unauthorized access and data leakage. Each transaction is authenticated, recorded in an immutable form on the blockchain, and secured against tampering or manipulation.The employment of Firebase for data storage and 2 factor.in OTP verification adds to the reliability and access of the system.
privacy and maintains data integrity but also simplifies the process of transaction and makes it user-friendly. The integration of these technologies forms a solid basis for developing a future-proof digital payment environment that caters to security as well as usability. Broadly, this project demonstrates that blockchain is not limited to cryptocurrencies — it can be an accepted platform for secure and transparent digital transactions in various sectors.
References
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How to Cite This Paper
Ananya.N, Greeshma.M.S, Panchami.G, Vandhana.K.M, Rakshitha.P (2025). Secure Blockchain Transaction. International Journal of Computer Techniques, 12(6). ISSN: 2394-2231.
