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Projects on Karma
5,243 projects found
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 ā 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
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 ā without relying on intermediaries.
https://github.com/sumana067/SafeProof
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Synhealth
Created on Nov 15, 2025
Access to healthcare should be secure, transparent, and user-controlled. Our platform empowers individuals to fully own and manage their health information using decentralized technology. Each user receives an NFT that serves as a secure access key to their encrypted medical data, consultations, and verified hospital records.
By combining decentralized storage, encryption, and NFT-based access, the platform ensures that health data is protected from unauthorized use while remaining easilyā¦
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CertiScore
Created on Nov 15, 2025
Immutable Grade Ledger is a decentralized smart contract that allows educational institutions to record, verify, and publish student grades in an immutable and transparent way.
Once a grade is entered, it cannot be altered or deleted, ensuring complete trust and authenticity in academic records.
This project is ideal for learning Solidity, smart contract deployment, and blockchain-based credential verification.
https://github.com/MdAbuHumza/CertiScore
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MemoChain DApp on Celo
Created on Nov 15, 2025
MemoChain is a beginner-level Solidity smart contract built on the Celo testnet (Celo-Sepolia).
The idea behind MemoChain is to create an on-chain card matching memory game, where players can flip and match pairs of cards stored directly on the blockchain.
This project is meant to help newcomers to Solidity understand smart contract basics, events, and state management in a fun and interactive way.
GitHub Repo : https://github.com/RanitPal/MemoChain
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HalloApp
Created on Nov 15, 2025
HalloApp allows users to deposit, withdraw, and track their Ether savings directly on the blockchain.
Every transaction (deposit or withdrawal) is stored permanently on-chain with a timestamp ā ensuring complete transparency and security.
This project is designed for beginners learning Solidity and blockchain app development using the Celo network or EVM-compatible blockchains.
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PrizeFi1.sol
Created on Nov 15, 2025
PrizeFi is designed as an educational blockchain project for learning how decentralized lotteries work.
Participants can join by paying a small entry fee, and the contract randomly picks a winner who receives the entire prize pool.
ā ļø Note:
The randomness in this demo uses block data and is not secure for real-world use.
For true randomness, use Chainlink VRF or another oracle service.
Github link : https://github.com/drishyam27/PrizeFi1.sol
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GiveFi
Created on Nov 15, 2025
A simple and transparent blockchain donation platform built with Solidity.
GiveFi enables anyone to donate ETH to verified causes, while ensuring every transaction is recorded publicly on-chain.
It is an educational blockchain project that demonstrates how smart contracts can be used to bring transparency to donations.
It allows the contract owner to add verified NGOs or campaigns, and donors can send funds directly to these causes ā no intermediaries, no hidden fees.
All donations are storedā¦
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CELO1-project
Created on Nov 15, 2025
ChainToss is a simple demo smart contract built in Solidity that simulates a coin flip game directly on-chain. Players send a fixed bet amount (0.01 ETH) and guess Heads or Tails. The contract then generates a pseudo-random result ā if the player guesses correctly, they instantly win double their bet!
This project serves as an educational example, ideal for beginners learning:
Payable functions
Events
Randomness (and its limitations on-chain)
ETH transfers and balance handling
GitHub Linkā¦
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Jayjit-2025.sol
Created on Nov 15, 2025
The TransparentLottery contract allows users to enter a lottery by sending a small amount of Ether (minimum 0.01 ETH).
Once enough players have entered, the manager (the person who deployed the contract) can call a function to randomly select a winner, who automatically receives the entire prize pool.
All interactions are recorded on-chain, making the process fully transparent and verifiable by anyone.
https://github.com/Jay6949/Jayjit-2025.sol
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ChainLotto
Created on Nov 15, 2025
ChainLotto is a tiny, easy-to-read Solidity project that demonstrates how to:
1. accept ETH payments from users (lottery tickets),
2. store participants on-chain,
3. generate a (simple, insecure) pseudo-random winner selection using on-chain block data,
4. transfer the accumulated prize to a winner,
and reset the game for the next round.
The goal is educational: to show core Solidity patterns (storage, payable functions, events, modifiers) in a compact, readableā¦
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RockPaperScissors Smart Contract
Created on Nov 15, 2025
RockPaperScissors is a decentralized, trustless version of the classic RockāPaperāScissors game ā built entirely on the Ethereum blockchain using Solidity.
This contract ensures fairness by using a commitāreveal mechanism, preventing cheating or front-running during gameplay.
Players commit to a hashed move first (without revealing it), and later reveal the move with their secret to determine the winner on-chain.
https://github.com/swastika02-git/Swastika
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oreo-web3
Created on Nov 15, 2025
Oreo is a blockchain-based record system designed for schools and universities to securely store and verify student results.
Instead of keeping grades or certificates in centralized databases, Oreo stores cryptographic proofs (hashes) of those results on-chain ā ensuring that they cannot be tampered with or forged.
Itās a simple, transparent, and beginner-friendly implementation built using Solidity and deployable on EVM-compatible chains such as Ethereum, Polygon, orā¦
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BlockEdu
Created on Nov 15, 2025
BlockEdu is a blockchain-based transcript management system that allows educational institutions to securely store and verify academic records on-chain.
By using blockchain, transcripts become tamper-proof, publicly verifiable, and accessible anytime ā eliminating the risk of fake certificates or manual verification delays.
https://github.com/sagnikchaudhuri2006-jpg/BlockEdu
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SimpleAuction
Created on Nov 15, 2025
SimpleAuction is a beginner-friendly smart contract that demonstrates the fundamentals of building a decentralized auction system on Ethereum.
It allows users to place bids in ETH, tracks the highest bidder, manages refunds for overbid participants, and automatically ends after a set duration.
This project is ideal for developers who want to understand:
> ETH transactions within smart contracts
> Safe fund withdrawal patterns
> Event-driven design in Solidity
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EduQuiz
Created on Nov 15, 2025
**EduQuiz** demonstrates how blockchain can make learning decentralized, transparent, and rewarding.
The contract allows a quiz creator (teacher) to add questions with correct answers, while students (players) can participate by submitting their responses.
Each correct answer earns the student points that are securely stored on-chain.
This project is ideal for beginners who want to learn:
How smart contracts work in Solidity
How to use structs, arrays, and mappings
Ownership control usingā¦
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workshop-doodle-trivia
Created on Nov 15, 2025
Doodle Trivia is a blockchain-based quiz application that leverages the immutability and transparency of smart contracts to create a fair and permanent trivia game. Built with Solidity, this dApp ensures that all quiz questions and player scores are stored on-chain, making them tamper-proof and verifiable by anyone.
Perfect for developers learning Web3, educators creating decentralized learning platforms, or anyone interested in blockchain gaming!
Githubā¦
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jayendra
Created on Nov 15, 2025
A decentralized smart contract built on Celo Sepolia Testnet, designed to collect and preserve public opinions permanently on the blockchain.
This project demonstrates how blockchain immutability can be used for transparency, trust, and open participation.
Project Github link : https://github.com/jayendra08/jayendra
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KindChain
Created on Nov 15, 2025
KindChain allows anyone to log their good deeds ā whether helping someone, donating, or spreading positivity ā so that each act is stored permanently on the blockchain. It shows how blockchain can be used for good causes and community transparency.
[Github link ](https://github.com/Rounak-webdev/Cello_Web3)
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Smart Warranty Registration & Validation System
Created on Nov 15, 2025
A simple Solidity smart contract that enables manufacturers to register product warranties on the blockchain and allows users to verify or transfer those warranties easily and transparently.
The Smart Warranty Registration & Validation System is a blockchain-based solution for securely recording and verifying product warranties.
It replaces traditional paper or centralized warranty systems with a decentralized ledger that ensures transparency, security, and trust between manufacturers andā¦
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web3-workshop
Created on Nov 15, 2025
AuctionFi is a blockchain-based auction system designed for transparency, fairness, and simplicity.
The smart contract allows users to bid using Ether, automatically handle refunds for losing bids, and ensure no further bids are accepted after the auction time ends.
Itās perfect for beginners who want to learn how decentralized auctions work on Ethereum!
github: https://github.com/adityabanerjee510-bit/web3-workshop.git
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Dominator
Created on Nov 15, 2025
The Transparent On-Chain Polling System is a blockchain-based voting platform that ensures secure, transparent, and tamper-proof polling. Using smart contracts, the system handles poll creation, voter registration, vote casting, and automatic result calculation. Every vote is stored on the blockchain as an immutable record, preventing fraud or manipulation. The system maintains voter anonymity while allowing anyone to verify the results, making it a reliable and decentralized solution forā¦
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HEALTHWITHCHAIN
Created on Nov 15, 2025
HealthwithChain is a simple decentralized health record management system built using Solidity.
It allows patients to securely store, update, and share their medical records on the Ethereum blockchain, ensuring transparency, security, and immutability.
This project is beginner-friendly and serves as a great starting point for learning how to handle access control, data privacy, and smart contract design in Solidity.
Github link : https://github.com/NIRBANMANNA/healthchain
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MarksheetVerification
Created on Nov 15, 2025
Github Link : https://github.com/kuNA78-hub/MarksheetVerification
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LendLedger1
Created on Nov 15, 2025
LendLedger is designed to demonstrate the core mechanics of decentralized lending. It provides a minimal yet functional framework for:
- Requesting loans with custom terms
- Approving loans by the contract owner
- Repaying loans with interest
- Emitting events for transparency and tracking
This project is ideal for beginners exploring smart contract development, Solidity basics, and blockchain-based financial workflows.
https://github.com/grenite07/LendLedger1
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CELO-project
Created on Nov 15, 2025
The SimpleVoting smart contract provides a decentralized and tamper-proof voting mechanism built on the Ethereum blockchain.
It allows the contract owner to add candidates, and voters (unique wallet addresses) to cast one vote per account.
This project is ideal for learning:
1.Solidity fundamentals
2.Smart contract deployment using Remix IDE
3.Blockchain voting logic (without a centralized database)
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BorrowBlock
Created on Nov 15, 2025
BorrowBlock is a simple and transparent blockchain-based ledger for recording credit agreements between lenders and borrowers.
It enables trustless, verifiable, and decentralized lending ā where all transactions and agreements are permanently stored on the blockchain.
This project is designed as a beginner-friendly Solidity smart contract for learning how to create, fund, repay, and manage small on-chain loan agreements securely.
Github Project Link:-ā¦
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MemoVault
Created on Nov 15, 2025
MemoVault is a beginner-friendly Solidity smart contract that allows users to securely store, update, and delete text entries directly on the blockchain.
Each text (called a memo) is permanently recorded on-chain, giving users full ownership and transparency over their data.
Github Link: https://github.com/Debrup-Chatterjee/MemoVault
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Fitledger
Created on Nov 15, 2025
FitLedger is a simple beginner-friendly Solidity smart contract that allows users to store their daily fitness logs immutably on the blockchain.
Each userās workout records are securely tied to their wallet address ā ensuring privacy, transparency, and permanence.
Perfect for anyone learning how to build decentralized applications (dApps) and exploring how blockchain can be used for personal data tracking.
**GitHub link:https://github.com/Pritamhaldar2006/Fitledger**
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gpy
Created on Nov 15, 2025
*BlockDare* is a decentralized application (dApp) built to function as an *on-chain challenge tracker, enabling individuals to create, view, and complete both personal and public challenges directly on the blockchain. By leveraging smart contracts written in Solidity and deployed on the Celo Sepolia Testnet, BlockDare ensures that every challenge is permanently recorded with a timestamp and the creatorās wallet address, making the process **transparent, immutable, and resistant to tampering*.ā¦
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MediTrack
Created on Nov 15, 2025
MediTrack is a decentralized application (dApp) designed to securely store patient vital information on the Ethereum blockchain.
It eliminates reliance on centralized medical record systems and empowers patients with complete ownership and access to their personal health data.
LINK: https://github.com/Ritesh-Gupta-op/lop.sol
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Simple-Solidity-Coin-Toss-Wager-Contract
Created on Nov 15, 2025
The ColorRegistry smart contract allows anyone to claim ownership of a color code by registering it on the blockchain.
Once a color (e.g., #FF5733 or rgb(255,87,51)) is registered, no other user can register the same color again.
This demonstrates how decentralized applications (dApps) can manage ownership of unique digital assets ā even something as simple as a color!
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CertiChain
Created on Nov 15, 2025
CertiChain is a beginner-friendly Solidity smart contract that demonstrates how to issue and verify digital certificates on the blockchain.
This project showcases how blockchain can be used for education, credential verification, and trustless record-keeping ā ensuring certificates are authentic, immutable, and publicly verifiable.
Github link: https://github.com/sachinnit25/CERTICHAIN/blob/main/README.md
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GUESSFI
Created on Nov 15, 2025
š Description
GUESSFI is an on-chain number-guessing game built using Solidity. It provides a transparent, provably fair gaming experience where players submit their guesses, and the smart contract autonomously determines the correct number using secure randomness. All game logic and payouts are verified on the blockchain, ensuring complete fairness and zero manipulation.
Players interact directly with the contract, making GUESSFI a simple yet powerful demonstration of decentralizedā¦
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Chromachain
Created on Nov 15, 2025
Github Repo - https://github.com/DeepSaha25/Chromachain
Welcome to Chromachain, a simple and playful decentralized registry built with Solidity.
The project demonstrates how to store and manage unique digital assets on-chain ā in this case, colors.
Each color is represented as a number (for example, a HEX color converted to a decimal value).
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A Simple On-Chain Game of Numeric Prediction
Created on Nov 15, 2025
This project demonstrates how to build an interactive blockchain game using Solidity, where players compete to guess a hidden number. Itās perfect for developers who are new to Ethereum smart contracts and want to explore concepts like:
contract ownership
state variables
Ether transfers
events
simple game logic
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CardVault ā Blockchain Digital Collectible Cards
Created on Nov 15, 2025
CardVault is a beginner-friendly blockchain project that allows users to mint, store, and reveal digital collectible cards using on-chain randomness. Each card starts hidden, like a mystery pack, and gets a random number when revealed. This randomness makes every collectible unique and unpredictable. CardVault helps showcase how blockchain can be used to create transparent, tamper-proof digital collectibles where card ownership, randomness, and reveal events are all verifiable on-chain.
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BequestBlock1
Created on Nov 15, 2025
In traditional systems, inheritance documentation can be lost, forged, or disputed.
BequestBlock solves this by leveraging blockchain technology to create a trustless and permanent record of inheritance wishes.
Every entry is securely stored on-chain and cannot be modified once recorded.
GitHub link :- https://github.com/sayandey-10/BequestBlock1.git
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NFT-Minter
Created on Nov 15, 2025
The NFT-Minter Project is an open-source, blockchain-based application designed to simplify the NFT creation process. It allows users to upload their NFT images, generate JSON metadata for the NFT, and interact with a dynamic NFT marketplace. Beginners can contribute to the project while learning how to develop decentralized applications (dApps). By offering easy integration with blockchain technology, the project aims to empower users to engage in the world of NFTs, regardless of technicalā¦
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VotingApp
Created on Nov 15, 2025
The Voting DApp allows users to vote for their favorite candidates in a transparent and verifiable way.
Each voter can vote only once, and every vote is stored on-chain, ensuring it cannot be modified or deleted.
This project is designed for beginners learning Solidity and Celo smart contract development.
Github link: https://github.com/Anamika-kumari-pandey/VotingApp
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Vote-ka-mamla
Created on Nov 15, 2025
In traditional voting systems, votes are managed by centralized authorities, which can lead to bias or manipulation.
Vote Ka Mamla solves this by allowing anyone to deploy and manage elections directly on the Celo blockchain ā ensuring fairness, transparency, and security.
This project runs on the Celo Sepolia Testnet, making it perfect for testing and learning.
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vote:-
Created on Nov 15, 2025
PROJECT DESCRIPTION:-
The Digital Voting System is a computer-based application designed to make the election process faster, secure, and more reliable. Traditional voting methods often involve long queues, manual counting, and a high risk of human errors or tampering. To overcome these challenges, this project introduces an automated voting solution.
In this system, each voter is provided with a unique login or voter ID to ensure secure authentication. After successful login, the voter canā¦
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debojit
Created on Nov 15, 2025
ToneChain is a simple, beginner-friendly Solidity project that demonstrates how immutable ownership can be represented directly on-chain.
Each unique HEX colour (e.g., #FF0000) can be claimed by one Ethereum address ā forever.
Once a colour is claimed, it cannot be changed, transferred, or reclaimed ā making the blockchain an unalterable registry of colour ownership.
ToneChain is designed to help new developers understand Solidity fundamentals such as:
State variables
Mappings
Events
Basicā¦
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Majama
Created on Nov 15, 2025
Majama is a beginner-friendly Solidity project that demonstrates how to build a decentralized event ticketing system on the blockchain.
It allows organizers to create events, users to buy tickets securely using crypto, and provides a transparent on-chain proof of purchase for every buyer.
Github Link: https://github.com/Ramesh-0/Majama
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CELO-PROJECT
Created on Nov 15, 2025
ChainGuess is a decentralized number guessing game designed to help beginners learn how to:
Build smart contracts using Solidity.
Deploy on the Celo blockchain.
Interact with on-chain events and ETH-based rewards.
The goal is to create a fun, transparent, and educational blockchain mini-game that showcases basic Solidity concepts like state variables, events, and randomness.
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vote-choori
Created on Nov 15, 2025
Vote choori refers to any illegal activity done to manipulate or steal votes during an election. It is a form of electoral fraud where individuals or groups try to change the election results unfairly. This can happen in many waysāsuch as casting fake votes, tampering with voting machines, pressuring voters, buying votes, or altering vote counts.
Vote choori destroys the fairness of democracy, because leaders are chosen without the true consent of the people. It creates mistrust in the electionā¦
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VoteKaCharcha
Created on Nov 15, 2025
Vote Ka Charcha is a beginner-friendly blockchain project where people can vote securely and transparently without relying on a central authority.
It demonstrates how voting systems can be made trustless, verifiable, and decentralized using Ethereum smart contracts.
The project can be easily deployed, tested, or extended for educational or real-world use cases such as:
Club or community elections
DAO-style governance
Polling systems for decentralized platforms
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meow
Created on Nov 15, 2025
This is a beginner-friendly Solidity smart contract that creates a decentralized library system on the blockchain. Users can add books, borrow them, and return themāwithout needing a central authority. The blockchain keeps everything transparent and secure.
GitHub Link: https://github.com/greenPenguin012/meow
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Celorefer SDK
Created on Nov 15, 2025
CeloRefer is a decentralized referral and reputation infrastructure built for the Celo blockchain. It features Solidity smart contracts powering quests, seasons, and soulbound Reputation NFTs with dynamic metadata. The celorefer-sdk, a production-ready TypeScript SDK with 70+ methods, enables type-safe integration for developers. Its live Frontend Demo DApp showcases referral tracking, seasonal leaderboards, animated NFT badges, staking, and admin controls. Comprehensive documentation,ā¦
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