Celo

OnChainQuiz is an Ethereum smart contract that brings quizzes directly to the blockchain. Designed for learning, fun, and transparency, this contract lets the owner create questions and anyone on the network submit answers. The correctness of responses is checked on-chain, making the process secure, trustless, and tamper-proof... Repository: https://github.com/arijitdas1/OnChainQuiz.git

Github Link : https://github.com/kuNA78-hub/MarksheetVerification

LendLedger is designed to demonstrate the core mechanics of decentralized lending. It provides a minimal yet functional framework for: - Requesting loans with custom terms - Approving loans by the contract owner - Repaying loans with interest - Emitting events for transparency and tracking This project is ideal for beginners exploring smart contract development, Solidity basics, and blockchain-based financial workflows. https://github.com/grenite07/LendLedger1

The SimpleVoting smart contract provides a decentralized and tamper-proof voting mechanism built on the Ethereum blockchain. It allows the contract owner to add candidates, and voters (unique wallet addresses) to cast one vote per account. This project is ideal for learning: 1.Solidity fundamentals 2.Smart contract deployment using Remix IDE 3.Blockchain voting logic (without a centralized database)

MemoVault is a beginner-friendly Solidity smart contract that allows users to securely store, update, and delete text entries directly on the blockchain. Each text (called a memo) is permanently recorded on-chain, giving users full ownership and transparency over their data. Github Link: https://github.com/Debrup-Chatterjee/MemoVault

FitLedger is a simple beginner-friendly Solidity smart contract that allows users to store their daily fitness logs immutably on the blockchain. Each user’s workout records are securely tied to their wallet address — ensuring privacy, transparency, and permanence. Perfect for anyone learning how to build decentralized applications (dApps) and exploring how blockchain can be used for personal data tracking. **GitHub link:https://github.com/Pritamhaldar2006/Fitledger**

*BlockDare* is a decentralized application (dApp) built to function as an *on-chain challenge tracker, enabling individuals to create, view, and complete both personal and public challenges directly on the blockchain. By leveraging smart contracts written in Solidity and deployed on the Celo Sepolia Testnet, BlockDare ensures that every challenge is permanently recorded with a timestamp and the creator’s wallet address, making the process **transparent, immutable, and resistant to tampering*.…

MediTrack is a decentralized application (dApp) designed to securely store patient vital information on the Ethereum blockchain. It eliminates reliance on centralized medical record systems and empowers patients with complete ownership and access to their personal health data. LINK: https://github.com/Ritesh-Gupta-op/lop.sol

BlockEdu is a blockchain-based transcript management system that allows educational institutions to securely store and verify academic records on-chain. By using blockchain, transcripts become tamper-proof, publicly verifiable, and accessible anytime — eliminating the risk of fake certificates or manual verification delays. https://github.com/sagnikchaudhuri2006-jpg/BlockEdu

The ColorRegistry smart contract allows anyone to claim ownership of a color code by registering it on the blockchain. Once a color (e.g., #FF5733 or rgb(255,87,51)) is registered, no other user can register the same color again. This demonstrates how decentralized applications (dApps) can manage ownership of unique digital assets — even something as simple as a color!

CertiChain is a beginner-friendly Solidity smart contract that demonstrates how to issue and verify digital certificates on the blockchain. This project showcases how blockchain can be used for education, credential verification, and trustless record-keeping — ensuring certificates are authentic, immutable, and publicly verifiable. Github link: https://github.com/sachinnit25/CERTICHAIN/blob/main/README.md

📌 Description GUESSFI is an on-chain number-guessing game built using Solidity. It provides a transparent, provably fair gaming experience where players submit their guesses, and the smart contract autonomously determines the correct number using secure randomness. All game logic and payouts are verified on the blockchain, ensuring complete fairness and zero manipulation. Players interact directly with the contract, making GUESSFI a simple yet powerful demonstration of decentralized…