Private Blockchain Application

What problem will you solve implementing this private Blockchain application?

lets imagine there are people who are interested in astronomy, so this is a test application that will allows people to register stars and making sure the application know who owned each star.

What tools or technologies you will use to create this application?

• This application will be created using Node.js and Javascript programming language. The architecture will use ES6 classes
• Some of the libraries or npm modules you will use are:
  • "bitcoinjs-lib": "^4.0.3",
  • "bitcoinjs-message": "^2.0.0",
  • "body-parser": "^1.18.3",
  • "crypto-js": "^3.1.9-1",
  • "express": "^4.16.4",
  • "hex2ascii": "0.0.3",
  • "morgan": "^1.9.1"

Starting with the boilerplate code:

First thing first, we are going to download or clone our boilerplate code.

Then we need to install all the libraries and module dependencies, to do that: open a terminal and run the command npm install

At this point we are ready to run our project for first time, use the command: npm start

You can check in your terminal the the Express application is listening in the PORT 8000

How to test your application functionalities?

To test your application I recommend you to use POSTMAN.

1. Run your application using the command npm start You should see in your terminal a message indicating that the server is listening in port 8000:

Server Listening for port: 8000

2. To make sure your application is working fine and it creates the Genesis Block you can use POSTMAN to request the Genesis block:
3. Make your first request of ownership sending your wallet address:
4. Sign the message with your Wallet:
5. Submit your Star
6. Retrieve Stars owned by me
7. validate blockchain function before mutation which gives an empty errorLog Array
8. mutate the blockchain: adds 2 blocks and then mutate the data to test the vlidateChain function
   
9. validate blockchain function after mutation which gives an array of all the errors