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Projects on Karma

5,240 projects found

Smart-Contract

Smart-Contract

Created on Nov 16, 2025

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.
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ChainShelf

ChainShelf

Created on Nov 16, 2025

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
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AbQuiz

AbQuiz

Created on Nov 16, 2025

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…
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aribaBank

aribaBank

Created on Nov 16, 2025

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
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student

student

Created on Nov 16, 2025

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.
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Celo-contract

Celo-contract

Created on Nov 16, 2025

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
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WEB3_CODE-CONTRACT

Created on Nov 16, 2025

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
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web3works

web3works

Created on Nov 16, 2025

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
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ChainPoll

ChainPoll

Created on Nov 16, 2025

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…
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PaisaSave

PaisaSave

Created on Nov 16, 2025

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
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contract-ticket.sol

contract-ticket.sol

Created on Nov 16, 2025

Ticket.sol is a Solidity-based smart contract that allows event organizers to issue, manage, and verify event tickets on the blockchain. Each ticket is represented as a token and recorded immutably, preventing counterfeiting or duplication. The goal is to bring trust and transparency to ticket distribution while giving event-goers verifiable ownership of their tickets.
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MyQuiz

Created on Nov 16, 2025

MyQuiz is a simple, beginner-friendly Solidity smart contract that stores and verifies users' quiz results on-chain. It saves each user's highest score with a timestamp so results are transparent, tamper-proof, and publicly verifiable. This repository is ideal for newcomers learning how to write, deploy, and interact with smart contracts using Remix and MetaMask. Github Project Link : https://github.com/soumik-27/MyQuiz
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quiz

quiz

Created on Nov 16, 2025

The On-Chain Quiz project demonstrates how blockchain can be used for decentralized learning and verification. Each question and answer is stored directly on-chain, and users can attempt quizzes knowing that results are tamper-proof and publicly verifiable. This smart contract is deployed on the Celo Sepolia Testnet and is ideal for learning purposes or as a foundation for more advanced quiz or educational dApps. GITHUB LINK : https://github.com/ayushman-c/quiz
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LibraryRecords

LibraryRecords

Created on Nov 16, 2025

LibraryRecords is a beginner-friendly Ethereum smart contract that manages a digital record of books in a library. It allows the library owner to add new books, while users can check out and return books transparently. All actions are permanently stored on the blockchain, ensuring open access to records without centralized control. https://github.com/ahilighosh03-a11y/Smart-Contract
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GuessFlow

Created on Nov 16, 2025

GuessFlow is a decentralized High-Low number guessing game built on the Ethereum blockchain. Players try to predict whether the next randomly generated number will be higher or lower than the previous one. This project demonstrates how to: Write and deploy a basic Solidity smart contract Use pseudo-randomness in smart contracts (for demo purposes) Handle Ether transactions (bets, payouts, and fees) Manage contract ownership and security It’s perfect for Solidity beginners learning how…
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Solidity Smart Contract Counter

Solidity Smart Contract Counter

Created on Nov 16, 2025

This repository contains a simple, production-ready setup for deploying a Solidity smart contract (a basic Counter) to the Celo Sepolia testnet using Hardhat. It’s tailored to be beginner-friendly while keeping a clean structure for real-world use.
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suitchain

Created on Nov 16, 2025

The Card Suit Guessing Game is a simple on-chain Ethereum/Celo smart contract designed for beginners to understand how blockchain randomness, events, and Ether transfers work. In this game, you guess a card suit — Clubs, Diamonds, Hearts, or Spades — and if your guess matches the randomly generated suit, you win double your money! 💰 ⚠️ Disclaimer: The randomness used here is not cryptographically secure and should be used for learning purposes only.
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PRANZ

PRANZ

Created on Nov 15, 2025

WheelFi is a decentralized "Spin & Win" game built on the Ethereum blockchain. Players can spin the wheel by sending ETH to the contract — if luck favors them, they instantly win a reward! The game operates without intermediaries, using smart contract logic to ensure transparency and fairness. WheelFi is designed as a fun, on-chain luck-based game where users can place small bets and potentially win multiples of their wager. This project demonstrates the core principles of decentralized gaming…
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hello ship celo

Created on Nov 15, 2025

hello ship celo is a tiny, production-ready starter for shipping smart contracts on Celo. It includes a minimal HelloShip contract, Foundry tests, a deploy script, and clear commands for build, deploy, verify, and on-chain proofs. The goal is to give builders a “hello world for shipping” on Celo Mainnet: something you can fork, run forge test, deploy, and submit as a verifiable Proof of Ship for grants, hackathons, and experiments
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Card-Guess

Card-Guess

Created on Nov 15, 2025

Suit Prediction Game is a beginner-friendly Ethereum smart contract that lets players test their luck by predicting a card suit — Hearts, Diamonds, Clubs, or Spades. If the player’s prediction matches the randomly generated suit, they win double their bet! This project is designed to help new Solidity developers understand: How to write and deploy smart contracts How to handle Ether transactions The basics of pseudo-randomness in Solidity https://github.com/swastikamitra05-coder/Card-Guess
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ayushman

Created on Nov 15, 2025

FavoriteColorNFT is a fun and simple ERC-721 NFT smart contract that lets users mint a color (in HEX format) as their very own NFT. Each color can only be minted once, ensuring that every hue on-chain is truly unique — just like its owner.
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CertificateVerifier-NIT-web3

Created on Nov 15, 2025

The purpose of this project is to help developers understand how to: - Deploy smart contracts on the Celo network - Handle transactions and receive funds using Solidity - Explore blockchain transparency through Celo Blockscout It’s an excellent starting point for anyone new to Web3, Celo, or smart contract development. **GitHub Link :** https://github.com/webdevbysubha/CertificateVerifier-NIT-web3
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PROJECT-BLOCKNOTE

PROJECT-BLOCKNOTE

Created on Nov 15, 2025

BlockNote is a lightweight smart contract designed for people who want to keep personal notes in a decentralized way. Every wallet address has its own set of private notes — meaning your data is stored only under your account and cannot be viewed or edited by others. This project demonstrates how decentralized storage can be used for privacy-oriented personal tools.
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ReportVault

ReportVault

Created on Nov 15, 2025

ReportVault is a Solidity-based smart contract designed to securely store user-generated reports on the blockchain. Each report is permanently recorded with a title, content (or IPFS link), author address, and timestamp — making it transparent, immutable, and accessible to anyone. Built for learning, transparency, and decentralized record-keeping, ReportVault is ideal for beginner developers exploring Solidity and smart contract deployment.
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Warrentchain

Created on Nov 15, 2025

WarrentChain.sol is a Solidity smart contract that records and manages product warranties on a public or permissioned blockchain. Each warranty entry is stored immutably with a unique identifier, timestamps, product metadata (serial/model), warranty terms, issuer identity, and owner address. The contract exposes functions for issuing, transferring, and verifying warranties, emits events for off-chain indexers, and includes access control to restrict issuance and claim processing to authorized…
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celo-nit

Created on Nov 15, 2025

Github Link: https://github.com/choudhurirajashri-code/celo-nit
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RockPaperScissor

RockPaperScissor

Created on Nov 15, 2025

PattharGame is an educational and entertaining blockchain project that brings the classic “Rock Paper Scissors” game to the Ethereum network. It is written in Solidity, designed for fair, transparent, and trustless gameplay, where all actions and results are recorded on-chain.
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DonoChain

Created on Nov 15, 2025

A beginner-friendly Ethereum smart contract that enables transparent donation collection and distribution — every donation and withdrawal is recorded on-chain for full visibility.
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votex

Created on Nov 15, 2025

A beginner-friendly smart contract written in Solidity that demonstrates how a voting system can be built on the Ethereum blockchain. It allows the contract owner to add candidates, start and end elections, and voters to securely cast their votes — all in a transparent, decentralized manner.https://github.com/nehha414/votex
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game_spin

game_spin

Created on Nov 15, 2025

🧩 Project Description The SpinGame smart contract is a beginner-friendly decentralized game that demonstrates how to use Solidity to create a luck-based game with pseudo-random outcomes. It allows users to: Spin for rewards. Claim their winnings. Watch transactions and rewards on-chain for full transparency. This project is perfect for developers who are learning Solidity, randomness handling, and basic smart contract design patterns. my github link: https://github.com/Anusua-2005/game_spin
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BlOClatCh

Created on Nov 15, 2025

BlOClatCh is a simple, educational Solidity smart contract designed to explore one of the most fundamental challenges in blockchain development: generating verifiable randomness for games. It simulates a basic "flip and match" game where players try to match two hidden "cards" (numbers) drawn by the contract. While it's a fun, lightweight concept, it serves as a critical demonstration of why relying on simple on-chain data for randomness is risky! https://github.com/sohagbanik/BlOClatCh
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PollLedger

Created on Nov 15, 2025

https://github.com/aniket-wott/PollLedger
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checkFi

checkFi

Created on Nov 15, 2025

This project is a decentralized checklist and progress-tracking system built using a Solidity smart contract. It allows users to create, manage, and complete their personal tasks directly on the blockchain, without relying on any centralized application or database. Each user, identified by their wallet address, receives their own secure on-chain task list where they can add new tasks, mark tasks as completed, and monitor their overall progress through an automatically calculated completion…
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ChainMemory

ChainMemory

Created on Nov 15, 2025

ChainMemory is a beginner-friendly Solidity smart contract designed to store, track, and retrieve game states and match results directly on the blockchain. It’s perfect for developers or learners exploring how to build decentralized applications (dApps) that record game data in a secure, transparent, and tamper-proof way. This project serves as a foundational example of blockchain-based game data storage, paving the way for more advanced concepts like multiplayer matches, leaderboards, and…
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checkFi

checkFi

Created on Nov 15, 2025

This project is a decentralized checklist and progress-tracking system built using a Solidity smart contract. It allows users to create, manage, and complete their personal tasks directly on the blockchain, without relying on any centralized application or database. Each user, identified by their wallet address, receives their own secure on-chain task list where they can add new tasks, mark tasks as completed, and monitor their overall progress through an automatically calculated completion…
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WORDFI

WORDFI

Created on Nov 15, 2025

WordFi is a simple decentralized application (dApp) built using Solidity and deployed on the Celo Sepolia test network. The contract stores inspirational quotes on the blockchain, allowing anyone to submit and view quotes. The quotes are immutable and can be accessed by anyone in the world, providing a transparent and public record of inspiring lines https://github.com/aryangupta-codes/WORDFI.git
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VibeCoding

VibeCoding

Created on Nov 15, 2025

VibeCoding is a smart contract–based concentration challenge where users can test their focus by joining a “vibe challenge.” Players deposit a small entry fee to participate, and upon completion, they can claim rewards if they succeed. Think of it as a “focus-to-earn” experiment — powered by blockchain transparency. Github repo link: https://github.com/shubhajeet26/VibeCoding
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ScoreChain

Created on Nov 15, 2025

ScoreChain is a blockchain-based smart contract built using Solidity that enables secure, transparent, and tamper-proof publication of student exam results. Unlike traditional centralized result systems, ScoreChain leverages blockchain immutability to ensure that once a result is published, it can never be altered or deleted. This helps educational institutions build trust and transparency, while allowing students to verify their scores publicly without revealing personal information.
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Immutable Education

Immutable Education

Created on Nov 15, 2025

ImmutableEducationRecords is a decentralized application (dApp) designed to maintain academic integrity and trust in educational records. Once a record is added by the admin, it becomes immutable — meaning no one can modify or delete it. This ensures transparency, permanence, and verifiability of all student academic data. Built on Celo, this project demonstrates how blockchain technology can transform traditional systems into verifiable digital ledgers that empower both institutions and…
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DrawChain

DrawChain

Created on Nov 15, 2025

DrawChain is a decentralized, provably fair on-chain draw system that uses a commit–reveal mechanism to ensure transparent and tamper-proof winner selection. GitHub Link:https://github.com/rupsaaa/DrawChain.git
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OnChainNotebook

OnChainNotebook

Created on Nov 15, 2025

On-Chain Notebook is a blockchain-powered journaling app that stores your notes immutably on the Celo network. Each wallet address acts as its own notebook — where every note you write is safely recorded with a timestamp. Think of it as a digital diary, but instead of living on a central server, it lives on-chain — forever accessible and owned by you. https://github.com/riyaahere28/OnChainNotebook
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VoteBhakti

VoteBhakti

Created on Nov 15, 2025

VoteBhakti is a decentralized application (dApp) that allows anyone to create and participate in transparent, tamper-proof voting events. It eliminates the need for a central authority by using smart contracts on the blockchain, ensuring that votes are secure, public, and verifiable. This project is ideal for beginners learning Solidity, as it covers the fundamental concepts of: Smart contract structure Data storage (mappings, structs, arrays) Access control (admin functions) Event…
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WorkChain Records

WorkChain Records

Created on Nov 15, 2025

WorkChain Records is a foundational Solidity smart contract designed for beginners to understand how to store structured data immutably on the blockchain. It implements a decentralized, tamper-proof ledger for tracking completed job assignments and maintaining a permanent, verifiable history of contributions. This project is an excellent starting point for learning about structs, mappings, and basic write/read functions in Solidity.
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Readvault

Readvault

Created on Nov 15, 2025

ReadVault is a beginner-friendly Solidity smart contract that tracks the ownership and borrowing history of both digital and physical books on the Ethereum blockchain. My github link: https://github.com/srijitag448-jpg/Readvault
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FlipCoin

FlipCoin

Created on Nov 15, 2025

FlipCoin DApp allows users to bet ETH (or CELO on testnet) on a coin flip — choosing Heads (true) or Tails (false). If the player wins, they receive double their bet. All bets and results are stored on-chain. The game logic is fully transparent and open for everyone to inspect. GITHUB : https://github.com/sumedhachowdhury-03-05/FlipCoin
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Railway Reservation System

Created on Nov 15, 2025

The Railway Reservation System is a software application designed to automate and simplify the process of booking train tickets, managing schedules, and handling passenger information. The system provides an efficient and user-friendly platform for passengers to search trains, check seat availability, make reservations, and cancel bookings. It also supports administrative functions such as adding train details, updating schedules, managing fares, and generating reports. This project aims to…
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PresenceLedger

PresenceLedger

Created on Nov 15, 2025

The Blockchain Attendance Registry is a secure, transparent, and tamper-proof on-chain attendance management system built using Solidity for EVM-compatible networks such as Ethereum, Polygon, and BNB Smart Chain. It allows institutions—such as universities, companies, and event organizers—to register participants and record attendance immutably on the blockchain. Every attendance action is logged as an on-chain event, creating a verifiable audit trail accessible to anyone.
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Immutable Donation Tracker

Created on Nov 15, 2025

Donation Tracker is an immutable and transparent donation-tracking system built on Ethereum. It lets anyone donate ETH to any wallet while permanently recording all donation history on-chain. Every transaction is timestamped, publicly visible, and stored forever, ensuring complete trust in the donation flow. GitHub Repository: https://github.com/bubbl3sss/Donation-Tracker
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web.sol

Created on Nov 15, 2025

CoinToss is a simple blockchain-based wagering game built using Solidity. Players can wager ETH (or the native token on a network like CELO) on the outcome of a virtual coin toss — Heads or Tails. If they guess correctly, they win double their wager. If not, their wager stays in the contract. This project demonstrates how to: Accept and send Ether in Solidity. Use pseudo-randomness (for learning purposes). Manage ownership and withdrawals securely. https://github.com/pragati-shaw/web.sol.git
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SafeProof

SafeProof

Created on Nov 15, 2025

SafeProof is a beginner-friendly Solidity smart contract that brings product authenticity, ownership history, and warranty tracking to the blockchain. Manufacturers can register their products on-chain, while buyers can transfer ownership and verify warranty validity anytime — without relying on intermediaries. https://github.com/sumana067/SafeProof
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