🎓 Online Learning Platform with NFT Certificate Verification

A full-stack application that enables learners to join online courses and receive NFT-based certificates stored and verified on the Ethereum Sepolia testnet. This project was built as part of a graduation thesis at the University of Sciences, Hue University.

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📚 Overview

The platform aims to provide a reliable and interactive online learning experience, combining:

• Course management system for learners and instructors.
• NFT-based certification with verification on-chain.
• Use of blockchain (Sepolia), IPFS, and AI Assistant.
• Real-time updates and decentralized storage for integrity and transparency.

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✨ Features

Learners:

• Register & login securely
• Browse, enroll in courses
• Track learning progress
• Receive NFT certificates
• Validate certificate authenticity on-chain

Instructors:

• Apply to become an instructor
• Create, update, and publish courses & lessons

Admin:

• Manage users, courses, categories
• Review instructor applications
• View platform analytics

NFT Certification:

• Issued as ERC-721 tokens
• Metadata stored on IPFS
• Soulbound (non-transferable)
• Verifiable on the Sepolia blockchain

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🧰 Tech Stack

Layer	Technologies
Frontend	Next.js, Tailwind CSS, TypeScript
Backend	Spring Boot, PostgreSQL, Firestore
Blockchain	Solidity, Hardhat, Sepolia Testnet
Storage	AWS S3, IPFS (Pinata)
DevOps	Docker, Docker Compose
AI Assistant	Gemini Generative Language API

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🏠 System Architecture

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🚀 Quick Start

🌐 Local Development

docker-compose up --build

🔋 Deploy Smart Contracts

npx hardhat run scripts/deploy.js --network sepolia

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🖊️ Smart Contracts

Features:

• ERC-721 standard
• Metadata stored on IPFS
• Hash verification for integrity

Example:

function verifyMetadataHash(bytes32 hash) external view returns (bool) {
    return _usedHashes[hash];
}

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📅 Certificate Lifecycle

1. Learner completes course
2. System generates metadata + image
3. Uploads to IPFS via Pinata
4. Mints NFT using mint() in smart contract
5. Metadata hash stored on-chain
6. Learner receives certificate in wallet
7. Verifier hashes metadata & checks on-chain

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📖 Thesis Reference

"Xây dựng Website cung cấp khóa học trực tuyến và ứng dụng blockchain để lưu trữ chứng chỉ trên mạng lưới Sepolia"

• Author: Mai Tiến Dũng, K45 - IT
• Advisor: Dr. Nguyễn Văn Trung
• Hue University of Sciences, June 2025

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📄 License

This project is for educational purposes only and not intended for production use.

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✨ Acknowledgments

• Etherscan, Pinata, Alchemy
• Gemini API by Google
• Spring, Hardhat, Next.js communities