Celo

TimeKeeper is a minimal smart contract built in Solidity that creates an immutable, timestamped record of submissions (called deliverables). Each submission is stored permanently on the blockchain with the submitter’s wallet address, a custom description, and the exact time of submission

The XYZ Smart Contract is a beginner-friendly Solidity project designed to demonstrate the fundamentals of Ethereum smart contract development. It showcases how to deploy a contract, manage ownership, and securely store on-chain data. The contract allows the owner to set and update a message while making it publicly readable for anyone. This simple yet practical project serves as an ideal starting point for developers exploring blockchain technology.

It is a beginner-friendly Solidity smart contract that allows players to join a simple number prediction game. Players choose a number between 1–10, pay a small entry fee, and wait for the game owner to reveal the winning number. If their prediction matches, they share the prize pool! Features : - 1. Join the game by paying a fixed entry fee (0.01 ETH). 2. Guess a number between 1 and 10. 3. Owner reveals the winning number. 4. Winners are rewarded automatically from the contract…

Traditional certificates can be lost, forged, or manipulated. EduProof solves this by keeping all verified certificates directly on-chain — making them easily verifiable and immutable. Institutions can issue certificates, and anyone can later verify them using a unique Certificate ID.

https://github.com/AKr3106/ChainRise_contract

Khazaana+ (meaning Treasure Chest) is a decentralized note-storing dApp built on blockchain technology. It allows users to store, update, and manage personal notes directly on the blockchain — no central servers, no third parties, and complete ownership of your data. Each user (wallet address) has their own note space, and all operations — adding, editing, deleting — are securely recorded on-chain. Github link: https://github.com/mushtaqsaqlain2004-code/KhazaanaPlus/tree/main

In today’s digital world, managing what happens to your online assets after death or long inactivity is a real concern. Trustchain provides an on-chain solution that automates this process using smart contracts. The contract allows an owner to: Register heirs and assign each a percentage of their estate. Periodically send a “heartbeat” to signal activity. Automatically release the assets to heirs if the owner remains inactive for a defined period. This eliminates reliance on centralized…

Welcome to the Transparent Guessing Game, a beginner-friendly Solidity smart contract project built to demonstrate how commit–reveal randomness works in a decentralized and transparent way. This game ensures fairness — even the owner can’t cheat — and all players can verify every step on the blockchain.

Transparent Guessing Game using Smart Randomness

In traditional healthcare systems, medical reports are often stored on centralized databases that are vulnerable to tampering, loss, or unauthorized access. HealthProof addresses this problem by leveraging blockchain technology to ensure data integrity, privacy, and verification of medical records. Each medical report is stored off-chain (e.g., on IPFS or cloud) and only its cryptographic hash is saved on the blockchain. This allows for verification without exposing sensitive data on the…

Checklist is an immutable daily productivity tracker built with Solidity. It allows each Ethereum user to maintain their own on-chain checklist of tasks. Once you add a task, it becomes part of your permanent blockchain record — promoting accountability and transparency in your productivity habits. This project is great for beginners learning how to: Work with structs and mappings in Solidity Understand storage and immutability Deploy and interact with smart contracts on EVM-compatible…

VotePoll is a simple and transparent decentralized voting system built on the Celo Sepolia Testnet. It allows anyone to vote for one of three candidates — Alice, Bob, or Charlie — directly on the blockchain. Every vote is stored immutably, ensuring fairness, transparency, and no double voting. This project demonstrates the power of Solidity smart contracts for governance or polling applications, making it perfect for blockchain beginners and learners.