Web 3.0 apps (Ðapp) now-a-days need to store/retrieve data just like Web 2.0 (conventional/centralized) apps. But it is extremely costly (computationally and hence monetarily) to store data (> few bytes) for eg PDF, images, etc on EVM. The EVM allow us to save variables/state in permanent storage cheaply. So a possible solution to store large data is to save the data off-chain using options such as: IPFS and Swarm. In this Ðapp, IPFS has been used for off-chain storage!

• (Use of virtualenv is strongly recommended!) pip install requirements.txt
• MetaMask extension
• Remix - Solidity IDE

• Create ethereum account using MetaMask. Make sure to choose "Ropsten Test Network"
• Request few ethers from the test faucet
• Go to Remix solidity IDE and copy-paste the contents of opinion.sol file in the IDE.
• Click on "Start to compile" from the Compile tab in the top right corner.
• After compiling it, go to Run tab and click on "deploy". Metamask should bring up a popup asking you to confirm the transaction. If not, just open the Metamask extension and do it there.
• A message at the bottom of the Remix console will notify you when the contract is deployed. You can click on the link to explore the transaction on ropsten.etherscan.io. Note the contracts address!
• Download Django source code.
• Now open the root folder of the source code in terminal:

  $ mkvirtualenv --python=python3 venv
  $ pip install requirements.txt
  $ ./manage.py makemigrations
  $ ./manage.py migrate
  $ ./manage.py runserver

• Now navigate to localhost:8000/ipfsLink