A secure, blockchain-powered academic credential verification platform designed to eliminate certificate fraud, streamline verification workflows, and establish institutional trust across Bangladesh.
CredChain-Nexus enables universities, employers, and graduates to issue, manage, and verify academic credentials in a decentralized, tamper-proof environment. By combining blockchain technology, SHA-256 cryptographic hashing, and Solidity smart contracts, the system guarantees integrity, transparency, and instant verification of academic records.
This solution directly addresses the manual, paper-based verification bottlenecks at institutions such as the University of Dhaka, BUET, and CUET.
Academic credential verification in Bangladesh faces systemic challenges:
| Challenge | Impact |
|---|---|
| Widespread forged certificates and transcripts | Undermines institutional trust |
| Manual, paper-based verification | Slow processing, high administrative cost |
| No unified digital infrastructure | Fragmented, inconsistent records |
| Limited international accessibility | Barriers for overseas employment and admissions |
Instead of storing raw certificate data on-chain, CredChain-Nexus stores a SHA-256 cryptographic hash of each credential on the blockchain — ensuring:
- Data immutability — records cannot be altered after issuance
- Tamper resistance — any modification breaks the hash match
- Decentralized verification — no single point of failure or control
- Privacy protection — sensitive data never leaves the institution
[ University Admin Panel ]
│
▼ SHA-256 Hash Generation
[ Smart Contract ] ──► [ Blockchain Layer ] (Ethereum / Private Network)
│
├──► [ Student Portal ] Signed certificate + QR code wallet
│
└──► [ Employer Portal ] QR scan → Hash comparison → ✅ Authenticated
Administrative Panel — University authority inputs and validates credential data, generates the cryptographic hash, and deploys the transaction via smart contract.
Blockchain Layer — Ethereum-based or private blockchain network running Solidity smart contracts. Provides public verification access without exposing raw sensitive data.
Student Portal — Secure credential dashboard with downloadable digital certificate and a shareable QR verification code.
Verification Portal — Employers upload a credential or scan a QR code. The system performs automatic hash comparison against the blockchain record and returns a real-time authenticity result.
| Layer | Technology |
|---|---|
| Backend | Java 17 (Spring Boot) |
| Frontend | HTML, CSS, JavaScript |
| Blockchain | Ethereum / Private Blockchain |
| Smart Contracts | Solidity |
| Database | MySQL |
| Local Blockchain Testing | Ganache |
| Wallet / Chain Interaction | MetaMask |
| API Testing | Postman |
| IDE | IntelliJ IDEA |
1. University uploads verified academic credential data
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2. System generates a SHA-256 hash of the credential
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▼
3. Hash is recorded on-chain via a deployed smart contract
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▼
4. Student receives a digitally signed certificate with embedded QR code
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▼
5. Employer scans QR code or uploads credential to the verification portal
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▼
6. System compares generated hash against the blockchain record
│
▼
7. ✅ Match confirmed → Credential is authentic
❌ Mismatch → Credential flagged as invalid
- Tamper-proof credential records via cryptographic hashing
- Real-time authentication with no administrative delay
- Privacy-preserving — raw data never stored on-chain
- QR code verification for instant employer validation
- Scalable architecture suitable for nationwide institutional rollout
- Compatible with both public and private institutions
| Traditional System | CredChain-Nexus |
|---|---|
| Manual, paper-based verification | Instant blockchain verification |
| Vulnerable to forgery | Cryptographically secured |
| High administrative overhead | Fully automated pipeline |
| Limited to local institutions | Global verification access |
| No audit trail | Immutable on-chain record |
- Overseas employment credential validation
- International higher education admissions
- Public sector recruitment authentication
- Private sector hiring verification
- Scholarship and visa documentation support
- Java 17 or higher
- MySQL
- Node.js
- MetaMask — for Ethereum wallet interaction
- Ganache — for local blockchain testing
# Clone the repository
git clone https://github.com/your-username/CredChain-Nexus.git
cd CredChain-Nexus
# Start the backend service
cd backend
mvn spring-boot:run
# Start the frontend application
cd ../frontend
npm install
npm startConfigure your .env or application.properties with your MySQL credentials and local Ganache RPC URL before starting.
- Integration with the Bangladesh Education Board
- Mobile application (Android / iOS)
- NFT-based academic credential representation
- Government digital service integration
- Cross-border verification compatibility
Kareeb Sadab
B.Sc. in Computer Science & Engineering
Chittagong University of Engineering and Technology
Rohan Singh B.Sc. in Computer Science & Engineering Chittagong University of Engineering and Technology
Specialization: Blockchain and Distributed Systems
This project is developed for academic research and educational purposes. Licensing terms will be updated upon production deployment.
Contributions are welcome. Please open an issue to discuss proposed changes before submitting a pull request.
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