Celo

Librichain is a decentralized, blockchain-based platform designed to record and manage book lending and borrowing activities on-chain. The system eliminates the need for centralized library authorities by using smart contracts to automate trust, ensure transparency, and maintain an immutable ledger of book transactions. In Librichain, every book is represented as a unique digital record (or token), and all lending, borrowing, and returning actions are securely stored on the blockchain. This…

Tomato is a lightweight Solidity smart contract that serves as an immutable repository for storing completed work references such as IPFS CIDs, GitHub links, or any verifiable identifiers. Once a submission is added, it is permanent, publicly viewable, and cannot be edited or deleted, ensuring full transparency and integrity. This project is perfect for: Developers and freelancers who want on-chain proof of work Students submitting projects or assignments immutably Teams tracking verified…

https://github.com/132anisoni-create/Contract-HireFi HireFi is a smart contract-based platform that enables trustless agreements between freelancers and clients. By leveraging blockchain technology, HireFi ensures transparent, secure, and automatic payments without intermediaries. Whether you're hiring a developer, a designer, or a consultant, HireFi makes freelancing safer and smarter.

🗓️ DailyCheckIn – Wallet-Based Attendance DApp DailyCheckIn allows users to mark their daily attendance through their crypto wallet. Each wallet address can check in once every 24 hours, and the record is stored permanently on-chain. This project is ideal for beginners learning Solidity and exploring wallet authentication, timestamp validation, and on-chain record keeping. It can easily be extended to build loyalty systems, streak trackers, or community engagement…

Traditional online games often hide their random number generation and outcomes, leaving players uncertain about fairness. chainspin solves that by putting the game logic on-chain, where every bet, random seed, and final result can be publicly verified. This project was built as a learning and demo project for beginners to explore: *Smart contract programming in Solidity. *Blockchain randomness using commit–reveal. *Event-driven architecture and provable outcome.

🩺 Patient Vitals On-Chain A simple and transparent Solidity smart contract for recording and updating patient vital signs (like heart rate, temperature, and blood pressure) directly on the blockchain. This project demonstrates how healthcare data can be made more secure, immutable, and decentralized using blockchain technology. 📘 Project Description The Patient Vitals smart contract allows patients to record their vital signs on-chain. Each patient is identified by their wallet address,…

This decentralized voting system is a blockchain-based application developed using Solidity to provide a secure, transparent, and tamper-resistant method for conducting elections. It allows users to cast votes that are permanently recorded on a distributed ledger, eliminating the risks associated with centralized databases. The system ensures fairness by preventing unauthorized access, duplicate voting, and data manipulation. Every action is validated through smart contracts, offering…

A simple and transparent attendance validation system built on the Ethereum blockchain using Solidity. This smart contract ensures that attendance records are immutable, tamper-proof, and verifiable — perfect for institutions that value integrity and transparency. Github repo link : https://github.com/Pmskabir1234/MyBlockChain

Higher or Lower, a fun and beginner-friendly Solidity smart contract game! This project helps you understand how to build, deploy, and interact with a simple on-chain guessing game using Ethereum smart contracts. it is a simple smart contract where players guess if the next randomly generated number will be higher or lower than the current one. project github link: https://github.com/aditisaha-ui/higherlower

🩺 Patient Vitals Record – On-Chain Healthcare Data System A simple and beginner-friendly Solidity smart contract that securely records and updates patient vitals (like heart rate, temperature, and blood pressure) on the blockchain. 🧠 Project Description This project demonstrates how blockchain technology can be used to make healthcare data transparent, secure, and immutable. Built on Celo Sepolia Testnet, this smart contract allows hospitals or authorized entities to record and update…

CertiChain is a Solidity-based smart contract designed for organizations (like universities, training centers, or certification bodies) that want to issue verifiable digital certificates on the blockchain. It ensures that certificates are authentic, immutable, and easy to verify by anyone — without relying on centralized systems. GitHub link: https://github.com/RBDevScripts/CeloRit

A simple Ethereum smart contract that simulates drawing random playing cards on the blockchain. Each draw is transparent, recorded on-chain, and linked to the user’s wallet address.