ScrutinX

Scrutinx : Gasless Voting with Meta Transactions & Relayer

Overview

In Scrutinx Vote Polygon, we implemented a *gasless voting mechanism using *meta transactions and a relayer. This enables users to vote on the blockchain without directly paying gas fees, significantly improving **accessibility, **transparency, and **user experience.

Meta Transactions

What Are Meta Transactions?

Meta transactions allow users to interact with the blockchain without directly paying gas fees. A third-party service, called a relayer, pays the gas on the user’s behalf.

How Meta Transactions Work

User Signs a Message: The user signs a message (like their vote) using their wallet (e.g., MetaMask). This message proves their intent.
Relayer Submits the Transaction: The relayer receives the signed message, constructs the transaction, and submits it while paying the gas fee.
Smart Contract Verifies: The smart contract verifies the signature and executes the vote if valid.

Relayer

Role of the Relayer

The relayer is a backend service that:

Accepts signed messages from users.
Verifies signature authenticity.
Constructs and submits the actual blockchain transaction.
Pays for the transaction's gas.

Relayer Implementation in Scrutinx

Listens for incoming signed vote messages from the frontend.
Validates signatures.
Builds the transaction using the vote data.
Submits the transaction to the Polygon network.

Gasless Voting

Benefits

Accessibility: No crypto? No problem—users without MATIC can still vote.
Improved UX: Removes gas fee complexity for non-technical users.
Inclusivity: Encourages broader democratic participation.

How We Implemented It

Frontend: Captures the vote and signs the data via wallet.
API Communication: Sends signed message to relayer via REST API.
Blockchain Execution: Relayer processes and submits the transaction to Polygon.
User Feedback: Once confirmed, the frontend shows a success message to the user.

Challenges and Considerations

Security: Ensuring only authorized votes are submitted and preventing misuse of the relayer.
Scalability: Handling thousands of vote submissions under heavy load.
Cost Management: Strategizing how to sustainably fund relayer gas payments.

Scrutinx : Hackathon Project Story

Inspiration

We were driven by the challenges in traditional voting—fraud, lack of transparency, and accessibility. Scrutinx was envisioned as a platform to make digital democracy real, powered by blockchain.

What We Learned

Blockchain Fundamentals: Transparent and tamper-proof systems.
Smart Contracts: Writing and deploying election logic on **Polygon using Solidity.
*Frontend Integration: Connecting smart contracts with *web3.js and ethers.js.
UX for Web3: Making blockchain easy for non-crypto users.

How We Built It

Ideation: Voter registration, secure voting, result tracking, and audit logs.
Smart Contracts: Created and deployed on **Polygon manniet.
Frontend: Built in **React with wallet login and voting UI.
Backend: Lightweight APIs for off-chain processes and alerts.
Testing: Continuous user testing and contract audits ensured reliability.

Challenges We Faced

Smart Contract Security: Required careful planning and testing.
Gas Optimization: Reduced transaction costs by refining logic.
User Onboarding: Made wallet interactions beginner-friendly.
Time Constraints: Rapid MVP development during hackathon deadlines.

javascript // Simple pseudocode of the voting flow userSignsMessage(voteData); relayerReceives(message); relayerSubmitsToBlockchain(); smartContractVerifiesAndRecordsVote(); frontendShowsConfirmation();

Conclusion

Scrutinx Vote Polygon stands as a proof of concept that secure, gasless, and inclusive voting can be achieved using blockchain. We hope it sparks future innovation in the digital voting space.