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Revocation of outdated diplomas — if a student loses their degree, the institution can revoke the record in the contract.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.