ParikkhaChain: Blockchain-Based Result Processing and Privacy-Preserving Academic Record Management for the Complete Examination Lifecycle

2026-04-18

AI Summary

This study addresses the vulnerabilities of traditional centralized academic examination systems—such as certificate forgery, grade tampering, and grading bias—by proposing the first blockchain-based framework that supports the entire offline examination workflow. The system leverages cryptographic hashing to anonymize answer scripts, integrates zero-knowledge proofs with off-chain storage to preserve privacy, and employs smart contracts to enable on-chain auditability and transparent review processes. Implemented on Ethereum using four Solidity contracts, the framework successfully simulates large-scale examinations across hundreds of courses, demonstrating its capacity to efficiently manage trustworthy exam administration for hundreds of students and instructors while maintaining high throughput and minimizing storage and transaction costs.

Technology Category

• Data Mining & Knowledge Management: Representing, Reasoning, and Using Provenance, Trust
• Multiagent Systems: Mechanism Design
• Game Theory and Economic Paradigms: Auctions and Market-Based Systems

Application Category

• Security and Privacy: Blockchains and distributed ledgers
• Economics, Online Markets and Human Computation: Economic aspects of blockchain and cryptocurrencies
• Systems and Infrastructure for Web, Mobile and WoT: Experiences and lessons learnt from Web-based algorithms and system deployments

Abstract

Academic examination systems worldwide continue to rely on centralised, opaque record-keeping that is often vulnerable to credential forgery, result tampering, examiner bias, and the absence of transparent re-evaluation pathways. Existing blockchain-based approaches in education focus predominantly on post-hoc certificate storage or online-only examination portals, leaving the complete onsite examination lifecycle, from conducting exams through scrutiny, largely unaddressed. This paper proposes ParikkhaChain, a blockchain-based framework that covers the entire examination lifecycle of an onsite examination system with three distinguishing contributions: (i) anonymous script evaluation through cryptographic hashing of answer scripts before examiner access, thereby eliminating identity-based bias; (ii) a transparent evaluation and scrutiny workflow backed by an immutable on-chain audit trail that records every mark submission and grade revision; and (iii) inclusion of privacy-preserving verification using zero-knowledge proofs and off-chain storage mechanisms. The system is architected around four Solidity smart contracts deployed on the Ethereum blockchain. The proposed architecture is the first initiative to our knowledge to support physical examination process, anonymous marking, and re-evaluation transparency. We successfully simulate full exam cycles of an onsite exam to grade-sheet generation using a working prototype on a large scale of 100 courses and hundreds of teachers and students. The experimental results show that the system can manage online examinations of hundreds of courses, students and faculties efficiently with great throughput, low storage, and transaction cost. Our codebase is available in open source form at https://github.com/AhmedRumi/CSE6608-ParikkhaChain

Problem

• academic examination
• credential forgery
• result tampering
• examiner bias
• transparent re-evaluation

Innovation

• blockchain
• anonymous evaluation
• zero-knowledge proofs
• examination lifecycle
• privacy-preserving