Blockchain based Banking System

This paper presented the design and development of a Blockchain-Based Banking System that integrates blockchain technology and smart contracts with conventional web application technologies. The proposed system combines a React frontend, a Node.js and Express.js backend, MongoDB for customer and application records, and Solidity smart contracts for managing financial account balances and banking operations. It supports account management, KYC processing, deposits, withdrawals, fund transfers, and transaction history tracking through role-based access for administrators, cashiers, and customers.   The system uses Web3.js to communicate with deployed smart contracts and associates blockchain transaction hashes and block numbers with application-level records to support transaction traceability and verification. A transaction-status management mechanism distinguishes Pending, Completed, and Failed operations and supports reconciliation when blockchain execution succeeds but the corresponding database update fails. By maintaining customer information off-chain and financial account state on the blockchain, the proposed architecture combines conventional data management with blockchain-based transaction processing.   The current implementation is developed and tested using Ganache as a local blockchain environment. Further evaluation is required to assess transaction correctness, access-control enforcement, database–blockchain consistency, processing latency, and failure recovery. As the system is still a research prototype, no claims of improved security, scalability, or performance are made without completed experimental results. Future work will focus on broader testing, smart-contract security analysis, and evaluation using Ethereum Sepolia to investigate the system's behavior under more realistic blockchain network conditions.

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