Voting System using Smart contract

This is a decentralized voting system based on Blockchain technology, which is distributed over a network using smart contracts.

Setup

Additionnal step on Windows:

If you get the following error while running any script:

You'll need to run Set-ExecutionPolicy -Scope Process -ExecutionPolicy Bypass.

Building the smart contract

1. First, you'll need truffle to interact with the smart contract :

npm i -g truffle

2. Truffle gives you a development environment with 10 accounts with Ethereum so you can interact with the contract, under the /contracts directory, run:

truffle develop

3. Also, to compile the smart contract, under the /contracts directory, run:

truffle migration

4. Update the backend.py file with the contract address that truffle migrate generates you. Also, update the private key list to the private keys given by truffle develop environment.

Here's some screenshots to help you with this step:

truffle migration	Verify private keys

Backend

For the backend, you'll need Python and pip. If you don't have it, follow the instructions on https://www.python.org/downloads/.

1. Let's create a virtual env for our project's dependencies on the root of the project:

pip install virtualenv
virtualenv venv
source venv/bin/activate -> .\Scripts\activate on Windows
pip install -r requirements.txt

2. You can now run the backend by running:

python backend.py

Frontend

The frontend is a React app. To run it, first go to the /frontend directory and run:

yarn install
yarn start

You should see the login screen :

You can also access the voting results by accessing the http://localhost:3000/admin link. Username is test and password is test123:

Possible improvements

• Add Metamask integration in the login page, currently to login, you simply enter a number from 0 to 9 that links to the proper account from the truffle environment.
• Improve overall security of the React app/smart contract
• Clean the frontend code, many components could be reused.
• Add methods to the smart contract other than vote (vote delegation for example).
• Integrate this smart contract in the Ropsten test network. You'll also need to use the Ropsten Ethereum Faucet to add test Ethereum to your accounts.