Description of the project 1: Private Blockchain Application

As a student of the Udacity Nanodegree program, I am starting my journey as a Blockchain Developer, this project allows me to demonstrate that I am familiarized with the fundamentals concepts of a Blockchain platform. Concepts like: - Block - Blockchain - Wallet - Blockchain Identity - Proof of Existance

In this project I will have a boilerplate code with a REST Api already setup to expose some of the functionalities I will implement in my private blockchain.

Dependencies

• 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"

How to test your application functionalities?

Using POSTMAN and debug code using VSCode.

1. Run your application using the command node app.js 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:

   This command is probably outdated so I used instead

   Message in Postman:

   {
       "hash": "a6bab81e354dd7d0894f7f2647b5fb1dd5b95cbd5648ecc21880e5534cea1df2",
       "height": 0,
       "body": "7b2264617461223a2247656e6573697320426c6f636b227d",
       "time": "1629140281",
       "previousBlockHash": null
   }   

3. Make your first request of ownership sending your wallet address:

4. Sign the message with your Wallet:

   In order to post signature , I generate legacy address as default wallet in electrum is sigwit. I followed instructions from this blog: https://bitcointalk.org/index.php?topic=5338687.0

   Message in Postman:

       {
           "address":"1BnBZxjZS8FuvAmYryhNv9pjNrywuLCemn"
       }

5. Submit your Star

   Message in postman:

       {
           "address":"1BnBZxjZS8FuvAmYryhNv9pjNrywuLCemn",
           "signature":"IGSRH8PzJRpom3YU03klzZ4soF5bvt/hHeDKNjmnGQ+fA4Q1nRMigDZdfDjvYUs52dpvRg1PoXUBodmg3Mgg5u0=",
           "message":"1BnBZxjZS8FuvAmYryhNv9pjNrywuLCemn:1629140445:startRegistr",
           "star": {
               "dec": "68° 52' 56.9",
               "ra": "16h 29m 1.0s",
               "story": "Testing the story 2"
           }
       }

6. Retrieve Stars owned by me

   Message in postman:

       [
           {
               "owner": "1BnBZxjZS8FuvAmYryhNv9pjNrywuLCemn",
               "data": {
                   "dec": "68° 52' 56.9",
                   "ra": "16h 29m 1.0s",
                   "story": "Testing the story 2"
               }
           }
       ]