Celo

AuctionFi is a Solidity-based smart contract designed to enable transparent, time-bound auctions directly on the blockchain. It allows users to participate in fair, verifiable bidding without relying on central authorities or off-chain systems. All bids, timestamps, and auction rules are enforced and recorded on-chain, ensuring complete transparency and preventing manipulation. AuctionFi serves as a simple yet practical introduction to decentralized auction mechanisms in Web3. GitHub…

This project is a simple Solidity smart contract designed to record borrower–lender relationships immutably on the Celo blockchain. It provides a transparent and permanent on-chain ledger where lending interactions can be stored securely without relying on centralized systems. By recording each relationship directly on the blockchain, the contract ensures that the lending history remains verifiable, tamper-proof, and accessible to all parties involved. GitHub Repository:…

FitLedger is a beginner-friendly Solidity smart contract designed to store daily fitness logs securely and immutably on the blockchain. Each user’s workout data is linked directly to their wallet address, ensuring that logs remain private, tamper-proof, and permanently accessible. By recording fitness information on-chain, the system demonstrates how personal tracking applications can be decentralized, transparent, and fully user-owned. GitHub Repository:…

The On-Chain Attendance Smart Contract is a Solidity-based system designed to securely record and verify attendance directly on the blockchain. Suitable for students, employees, and organizational use-cases, it provides a permanent and transparent way to track presence without relying on centralized logs or manual records. The repository includes both the smart contract code and the usage guide, making it easy for beginners to deploy, test, and integrate the system into real-world…

ChainShelf is a blockchain-powered book management system that brings transparency, fairness, and verifiability to library-style operations. Built using Solidity, it showcases how real-world systems—such as book lending and tracking—can be recreated on-chain with complete tamper-proof accuracy. The project is beginner-friendly and demonstrates the fundamentals of smart contracts, decentralized record-keeping, and transparent resource management. GitHub Repository:…

This repository provides a clean, beginner-friendly, and production-ready setup for deploying a simple Solidity smart contract—specifically a basic Counter—to the Celo Sepolia testnet using Hardhat. It offers a structured and professional project layout that mirrors real-world development practices, making it ideal for anyone learning how to build, compile, test, and deploy smart contracts efficiently. The setup streamlines the entire workflow, helping developers quickly understand how to…

This project is a simple and transparent on-chain voting system built using Solidity, designed to let users create polls, cast votes, and view real-time results with complete trust. Every action—from poll creation to the final tally—is permanently stored on the blockchain, ensuring full transparency and preventing any form of tampering or manipulation. The system demonstrates how decentralized governance mechanisms can be deployed using smart contracts while remaining user-friendly and…

ChainShelf is a Solidity-powered smart contract built to bring full transparency and accountability to book lending systems. Designed for libraries, institutions, and community spaces, it enables books to be checked out and returned with every action permanently recorded on the blockchain. By making all lending activity tamper-proof and publicly verifiable, ChainShelf ensures fairness, trust, and secure management of book inventories. GitHub Repository:…

Amrita Ki Sarkar is a decentralized blockchain-based voting system designed to make elections transparent, trustworthy, and accessible. Built using Solidity and deployed on the Celo Sepolia Testnet, it enables the creation of tamper-proof elections where every participant can vote only once, and all results are permanently stored on the blockchain. By allowing anyone to verify votes and candidate data on-chain, the system eliminates the risks of manipulation, hidden results, or administrative…

The Transparent Decentralized On-Chain Banking System is a Solidity-based smart contract that demonstrates how blockchain can be used to build a secure, transparent, and trustless banking model. Instead of relying on a centralized authority, users interact directly with the smart contract to create accounts, deposit funds, withdraw balance, and track their financial activity. Every action is recorded permanently on the blockchain, ensuring complete transparency and eliminating the possibility…

VIBE CODE is a beginner-friendly Solidity smart contract designed to bring transparency, trust, and accountability to simple financial interactions on the blockchain. It allows users to deposit, withdraw, and transfer Ether with each action recorded permanently on-chain, making every transaction publicly verifiable. By storing user balances and logging all activity through events, the project demonstrates the foundational principles of decentralized finance while remaining simple enough for…

RedCard is a Solidity-based smart contract designed to bring full transparency and accountability to sports officiating. It enables referees or league authorities to record yellow and red card violations directly on the blockchain, ensuring that every foul is stored permanently and cannot be altered or deleted. By keeping all player violations publicly visible and timestamped, RedCard creates an immutable and trustworthy match history where disputes, manipulation, or loss of records are…