Celo

This project demonstrates how to record attendance or presence data on-chain using Solidity. Each check-in is stored immutably on the blockchain with a timestamp. Github Link: https://github.com/ArnabKrPal/Presence-Tracker

memochain is a decentralized, Solidity-based smart contract that functions as a permanent on-chain memory vault. It enables users to store short text-based “memories” directly on the blockchain, ensuring that each entry is securely timestamped, author-verified, and publicly transparent. Every memory written to the contract becomes part of an immutable chain of thoughts — preserving user-generated content in a trustless and censorship-resistant manner. The project demonstrates how blockchain…

BlockQuiz is an educational and entertaining blockchain application designed for beginners exploring Solidity and smart contract development. With BlockQuiz, you can: Learn how to write and deploy smart contracts. Understand how data (like quiz questions and answers) is stored on-chain. Experiment with reward systems, ownership logic, and blockchain transparency.

In traditional library systems, book borrow and return records are stored in centralized databases — which can be altered, lost, or corrupted. ChainShelf uses blockchain technology to create a decentralized record-keeping system where every book checkout and return is logged permanently and transparently. This project is built for Solidity beginners who want to understand: Smart contract logic Access control (owner vs. users) Event logging for transparency Real-world blockchain applications

AbQuiz is a simple smart contract that introduces new developers to core blockchain concepts such as: 1. Ownership control (onlyOwner modifier) 2. Data immutability and transparency 3. Hashing for secure answer storage (keccak256) 4. Event emission (QuizWon) for on-chain notifications Once deployed, the contract lets the quiz owner set a question and store a hashed version of the correct answer (so nobody can read it directly from the blockchain). Participants then submit answers — the…

aribaBank is a simple yet powerful example of a transparent, decentralized banking system built entirely on the blockchain. It allows users to deposit, withdraw, and transfer ETH securely — all actions are recorded on-chain for full transparency. This project aims to teach Solidity beginners how to handle Ether transactions, mappings, modifiers, events, and security mechanisms such as reentrancy protection. https://github.com/AribaRazi/aribaBank

The Student Record smart contract provides a transparent and tamper-proof way to record and verify student achievements on the blockchain. Each student (identified by their Ethereum address) can add achievements — such as course completions, certifications, or awards — to their personal record. These achievements are stored permanently on-chain and can be retrieved or verified by anyone.

Medichain is a blockchain-based decentralized application (dApp) that provides a secure, transparent, and immutable way to store health reports. Built on the Celo blockchain, this smart contract ensures that once a medical report is added, it cannot be modified or deleted, preserving the integrity of health data forever. This project is perfect for learning how to use Solidity for real-world applications in healthcare data security. problem and solution

StudentRecords is a simple Ethereum-based smart contract written in Solidity that securely stores and verifies student academic records on the blockchain. It ensures transparency and trust — once data is stored, it cannot be tampered with, making it perfect for decentralized academic record management. github:https://github.com/arya21t/web3works

LoanChain is a beginner-friendly Solidity smart contract designed to keep an immutable on-chain record of all borrowed and repaid funds. It acts as a transparent ledger where every loan and repayment is permanently stored on the blockchain — ensuring trust, transparency, and immutability between parties. This project is perfect for developers learning how to: Use structs, arrays, and events in Solidity Store and retrieve on-chain data Create transparent and auditable financial records

ChainPoll is a minimal on-chain polling system where users can create polls with multiple options, cast one vote per address, and view results at any time. It focuses on clarity, safety, and transparency, making it ideal for first projects and tutorials. What it does Create polls 📝 with a question and 2–10 options, emitting events for easy tracking. Allow addresses to vote 🗳️ exactly once per poll, preventing duplicates. View poll info and results 📊 via public read functions for frontend or…

PaisaSave enables users to securely store and manage funds with smart contracts. It is a simple Ethereum smart contract written in Solidity. It lets users deposit ETH, check their balance, and withdraw their own funds. It keeps a mapping of addresses to balance. The project's public github link : https://github.com/sourashreemukherjeenit-web/PaisaSave