Jeevan-Kiran-Lenka / Medblock-V1.0.0

A blockchain application to store EHR data

Medblock-V1.0.0 - Blockchain for Health Data Management

Introduction

The aims of this application are:-

• To implement blockchain technology for storing, updating, and retriving EHR.
• To provide secure storage of electronic records by defining granular access rules for the users of the proposed application.
• This application also discusses the scalability problem faced by the blockchain technology in general via use of off-chain storage of the records. This application provides the EHR system with the benefits of having a scalable, secure and integral blockchain-based solution.

Video Demo: Link

Installation Procdure

This application requires NodeJS, npm, Truffle, Ganache, and IPFS to work. Instruction to install all, and setup dependencies are given below.

Node Modules

1. Move to the project directory cd app
2. Run npm install to install project dependencies.

Ganache

1. Go to Ganache homepage and download.
2. If you are on Linux, you must have received an .appimage file. Follow installation instructions available here.

IPFS (Inter Planatery File System)

1. Go to the github page of IPFS and install IPFS Desktop.

Local Server

1. Install Node lite-server by running the following command on your terminal from project root directory npm install -g lite-server.

Metamask

1. Metamask is a browser extension available for Google Chrome, Mozilla Firefox and Brave Browser.
2. Add Metamask to your browser by clicking here.

Getting the DApp running

1. Ganache

• Open Ganache and create a new Workspace.
• Add truffle_config.js in Add Project Section
• Under Server tab:
  • Set Hostname to 127.0.0.1 -lo.
  • Set Port Number to 8545.
  • Enable Automine.
• Under Accounts & Keys tab:
  • Enable Autogenerate HD Mnemonic

2. IPFS

• Fire up your terminal and run ipfs init. If it says command not found then follow this link
• Then type the following command from your project root directory.

ipfs config --json API.HTTPHeaders.Access-Control-Allow-Origin "['*']"
ipfs config --json API.HTTPHeaders.Access-Control-Allow-Credentials "['true']"
ipfs config --json API.HTTPHeaders.Access-Control-Allow-Methods "['PUT', 'POST', 'GET']"

Note - If you face any issues with the above command on windows, try using command prompt and escape sequences or git bash, same goes for Linux, Mac and other machines.

3. Metamask

• After installing Metamask, click on the metamask icon on your browser.
• Click on continue and accept all the terms and conditions after reading them.
• Stop when Metamask asks you to create a new password. We will come back to this after deploying the contract in the next section.

4. Smart Contract

• Install Truffle using npm install truffle -g.

• Compile Contracts using truffle compile.

  1. Starting your local development blockchain

  • Open Ganache.
  • Make sure to configure it the way mentioned above.
  • Open new Terminal and deploy contracts using truffle migrate.
  • Open Remix, upload MedBloack.sol and then deploy it.
  • Copy deployed contract address to src/js/app.js

  // app/src/app.js  line number 11
  var agentContractAddress = '0x75E115394aacC7c6063E593B9292CB9417E4cbeC';

  • If you change contents of any contract , replace existing deployment using truffle migrate --reset.
  • Deploy the modified contract on remix and change the ABI in src/js/app/js to the deploted contract ABI.

5. Running the DApp.

1. Connecting Metamask to our local blockchain

- Connect metamask to localhost:8485
- Click on `Import Account`.
- Select any account from ganache and copy the private key to import account into metaMask.

2. Starting IPFS

- Start the IPFS Desktop Application

3. Starting Local Server

- Open a new terminal window and navigate to `/YOUR_PROJECT_DIRECTORY/app/`.
- Run `npm start`.
- Open `localhost:3000` on your browser.

Eureka! Eureka ! The DApp is up and running locally

Contribution

We have added a new FurtherImprovement.md file please go ahead, read it, review it and drop your suggestions as a PR 😃.