Blockchain Builder

What is this?

This is a repository containing Node scripts that allow you to build your own blockchain from the terminal! It's meant to be used primarily as a tool to educate yourself or others about how blockchain technology operates. Feel free to explore the code, read the comments, and learn about the insanely cool world of blockchain tech!

Usage

# Install dependencies
$ npm i

# Run
$ npm start

Example run

$ npm start

Welcome to Blockchain Builder!
Creating new Blockchain...
Set Blockchain name: My Blockchain
Set level of difficulty: 3
Mining genesis block...
Genesis block created!
Specify number of blocks: 4
Mining...
Block 1 mined! Hashcode: 000905a4b526e5851707d9ed878c28b1786ac16821677de488aab991072bc1d9
Mining...
Block 2 mined! Hashcode: 000b8237a46fb07b64f24c3c3ccbe340b37779a51fdbbec44f2e1bc7473fe505
Mining...
Block 3 mined! Hashcode: 000f8e5c1965d03c2643720d20ef0b9ec442c7eb9abcf61758bbef07a2f451ca
Mining...
Block 4 mined! Hashcode: 000147f0681e8395a728786963427121dac58830c2e92becc8071968092c2bdf
Do you want to print this chain? yes        
Printing My Blockchain...
{
   "name": "My Blockchain",
   "difficulty": "3",
   "chain": [
      {
         "index": 0,
         "timestamp": "2019-08-13T00:09:57.480Z",
         "data": "Genesis Block",
         "previousHash": "0",
         "nonceVal": 7764793301979365,
         "hash": "000f996e8b719d37cb467623f915e422fbe8b3856532b58cd4d891ee9da830af"
      },
      {
         "index": 1,
         "timestamp": "2019-08-13T00:10:00.991Z",
         "data": {
            "val": 0
         },
         "previousHash": "000f996e8b719d37cb467623f915e422fbe8b3856532b58cd4d891ee9da830af",
         "nonceVal": 8962840235927367,
         "hash": "000905a4b526e5851707d9ed878c28b1786ac16821677de488aab991072bc1d9"
      },
      {
         "index": 2,
         "timestamp": "2019-08-13T00:10:01.664Z",
         "data": {
            "val": 1
         },
         "previousHash": "000905a4b526e5851707d9ed878c28b1786ac16821677de488aab991072bc1d9",
         "nonceVal": 6494732704838765,
         "hash": "000b8237a46fb07b64f24c3c3ccbe340b37779a51fdbbec44f2e1bc7473fe505"
      },
      {
         "index": 3,
         "timestamp": "2019-08-13T00:10:01.669Z",
         "data": {
            "val": 2
         },
         "previousHash": "000b8237a46fb07b64f24c3c3ccbe340b37779a51fdbbec44f2e1bc7473fe505",
         "nonceVal": 6122984295262343,
         "hash": "000f8e5c1965d03c2643720d20ef0b9ec442c7eb9abcf61758bbef07a2f451ca"
      },
      {
         "index": 4,
         "timestamp": "2019-08-13T00:10:01.673Z",
         "data": {
            "val": 3
         },
         "previousHash": "000f8e5c1965d03c2643720d20ef0b9ec442c7eb9abcf61758bbef07a2f451ca",
         "nonceVal": 56111241933455,
         "hash": "000147f0681e8395a728786963427121dac58830c2e92becc8071968092c2bdf"
      }
   ]
}
Do you want to validate this chain? yes
Blockchain Validity: true
Thanks for using Blockchain Builder!

Author

Created by Ibrahim Ali. Contact: ibrahim.ali@vanderbilt.edu