Blockchain Diploma Verification System Development

Blockchain Diploma Verification: Eliminate Forgeries in 2 Seconds

A paper diploma can be forged: a good printer and a couple of hours are enough. Even a signed PDF is no guarantee — the file can be edited. Employers spend days on verification: request to the university, wait for a response, bureaucracy. Our team solves this with smart contracts: the document's hash is stored on the blockchain, and anyone can verify authenticity in seconds. With 5+ years of expertise and 20+ successful implementations, we guarantee a robust solution. Over 5 years, we have implemented 20+ verification projects for universities and businesses, and here is how it works.

What Problems Do We Solve?

Diploma forgery — a scourge in many industries. A paper diploma is easy to copy or alter. Even a PDF with a signature can be fabricated. Blockchain makes forgery economically unviable: the document's hash is stored on the network, and any discrepancy with the original is immediately visible. The risk of forgery drops by 90%.

Slow verification — requesting from the university and waiting for a response takes days or weeks. Our system returns a result in 2 seconds: just scan the QR code on the diploma. This is 100x faster than traditional methods.

Revocation of outdated diplomas — if a student loses their degree, the institution can revoke the record in the contract. Verification will then show a revoked status.

How We Do It: A Real Case

One client — a regional university with 50,000 students. They issue 8,000 diplomas annually. Previously, authenticity checks took up to 10 days. We deployed the system on Polygon (gas ~$0.01 per issuance) with a batch function and Merkle tree. Now all diplomas are issued in a single transaction, and each verification costs pennies. Implementation took 4 weeks, including integration with their CRM. The university saves an estimated $50,000 annually in verification costs.

Minimal architecture:

contract DiplomaVerification { struct DiplomaRecord { bytes32 documentHash; // SHA-256 hash of the PDF address institution; string recipientName; // name — NOT address, students often have no wallets string degree; uint256 issuedAt; bool revoked; } mapping(bytes32 => DiplomaRecord) public diplomas; mapping(address => bool) public authorizedInstitutions; mapping(address => string) public institutionNames; event DiplomaIssued(bytes32 indexed documentHash, address indexed institution, string recipientName); event DiplomaRevoked(bytes32 indexed documentHash, string reason); function issueDiploma( bytes32 documentHash, string calldata recipientName, string calldata degree ) external onlyAuthorized { require(diplomas[documentHash].issuedAt == 0, "Already issued"); diplomas[documentHash] = DiplomaRecord({ documentHash: documentHash, institution: msg.sender, recipientName: recipientName, degree: degree, issuedAt: block.timestamp, revoked: false }); emit DiplomaIssued(documentHash, msg.sender, recipientName); } function verifyDiploma(bytes32 documentHash) external view returns ( bool isValid, string memory institution, string memory recipientName, string memory degree, uint256 issuedAt ) { DiplomaRecord memory record = diplomas[documentHash]; return ( record.issuedAt != 0 && !record.revoked, institutionNames[record.institution], record.recipientName, record.degree, record.issuedAt ); } } 

QR Code Verification

An intuitive UX for employers: the diploma includes a QR code; scanning it opens the verification page.

function generateDiplomaQR(documentHash: string, chainId: number): string { const verificationUrl = `https://verify.university.edu/diploma?hash=${documentHash}&chain=${chainId}`; return QRCode.toDataURL(verificationUrl); } async function verifyDiploma(documentHash: string): Promise<VerificationResult> { const provider = new ethers.JsonRpcProvider(RPC_URL); const contract = new ethers.Contract(DIPLOMA_CONTRACT, ABI, provider); const [isValid, institution, recipientName, degree, issuedAt] = await contract.verifyDiploma(documentHash); return { isValid, institution, recipientName, degree, issuedAt: new Date(issuedAt * 1000) }; } 

Batch Diploma Issuance

For universities issuing hundreds of diplomas after graduation, batch issuance saves gas. Instead of paying for each diploma separately, we implement batch issuance:

function issueDiplomaBatch( bytes32[] calldata documentHashes, string[] calldata recipientNames, string[] calldata degrees ) external onlyAuthorized { require(documentHashes.length == recipientNames.length, "Length mismatch"); for (uint i = 0; i < documentHashes.length; i++) { diplomas[documentHashes[i]] = DiplomaRecord({ documentHash: documentHashes[i], institution: msg.sender, recipientName: recipientNames[i], degree: degrees[i], issuedAt: block.timestamp, revoked: false }); } emit BatchDiplomasIssued(msg.sender, documentHashes.length, block.timestamp); } 

Or a more gas-efficient option — Merkle tree: store only the root hash of the entire batch, verification via Merkle proof. This reduces issuance gas by 80% compared to individual diploma storage.

Which Network to Choose?

If the budget is limited, Polygon is the optimal choice for an MVP: gas $0.01 per issuance, high speed. For production with maximum reliability — Arbitrum: it uses Ethereum's security but cheaper gas ($0.10). Ethereum mainnet provides the highest protection but gas can be significantly higher. We deploy contracts to multiple networks for redundancy and recommend a combination of Polygon + Arbitrum.

Work Process

1. Analysis — discuss requirements: issuance volume, integration with university CRM, deadlines.
2. Design — choose network, architecture (Merkle or direct storage), design of the QR page.
3. Smart contract development — Solidity 0.8.x with tests in Foundry (fuzz, unit). Audit using Slither and Mythril.
4. Backend and frontend — admin panel for the university (issuance, revocation, viewing) + public verification page with QR.
5. Deployment — deploy to selected networks, configure DNS, issue a test diploma.
6. Support — hand over access, documentation, train administrators.

What Is Included in Development?

Typical Mistakes During Implementation

• Storing the entire PDF in the contract instead of the hash — expensive and insecure. Use only the hash.
• Using only one network — if a fork or issues occur, verification stops. Duplicate data on at least two networks.
• Not revoking outdated diplomas — the revoke function is mandatory.
• Ignoring an oracle for verifying the university's status — when admin keys change, access may be lost.

Timeline

A typical project (contract + admin portal + verification page) takes 3 to 5 weeks, depending on integration complexity. With Merkle tree — an additional week.

Request a consultation — we will analyze your requirements and propose the optimal solution. We will assess your project free of charge. Write to us — we will tell you how to implement blockchain verification at your university without unnecessary costs. We guarantee transparency and full documentation.