Decentralized election aplication built on Ethereum blockchain

This project is an Ethereum-based application which allows to hold an election. Smart contract is written in Solidity, front-end is built with Next.js framework and uses The Graph to read data from the blockchain. Here are the main features of this app:

• The contract sets deployer as an election admin.
• Election admin control election process. He can add voters, candidates, start and stop election.
• Only authorised voters have right to vote.
• Election admin control when election is open.

This Dapp goal is to allow some centralized entity to hold en election with easily verifiable results. Thanks to blockchain technology any attems of fraud are impossible.

This repository contains only frontend code. For smart contract and subgraph code see links below

• Election smart contract code

• Subgraph code

Getting Started

1. Deploy to goerli

Deploy election contract to goerli. Code is in this repository.

yarn hardhat deploy --network goerli

2. Create your subgraph via Subgraph Studio

If you need help check The Graph Docs

You need to write your subgraph before deploying it. Copy necessary files from subgraph repository.

3. Add .env file

Create a .env file and place your temporary query URL into it as NEXT_PUBLIC_SUBGRAPH_URL. You can find temporary query url in subgraph studio

4. Start your UI

Make sure that:

• You have constants folder with Election ABI and networkMapping.json
• In your networkMapping.json you have an entry for Election on the goerli network.
• You have a NEXT_PUBLIC_SUBGRAPH_URL in your .env file.

Files in constants folder will update automatically as long as frontend and smart contract repository are in the same folder

Then you can run frontend

yarn dev

License

MIT