https://github.com/bittricky/simplechain

Blockchain Example
https://github.com/bittricky/simplechain

crypto-js javascript leveldb

Last synced: 4 days ago
JSON representation

Blockchain Example

• Host: GitHub
• URL: https://github.com/bittricky/simplechain
• Owner: bittricky
• Created: 2018-11-12T22:00:43.000Z (about 6 years ago)
• Default Branch: master
• Last Pushed: 2024-05-23T01:59:50.000Z (6 months ago)
• Last Synced: 2024-05-28T16:11:26.327Z (6 months ago)
• Topics: crypto-js, javascript, leveldb
• Language: JavaScript
• Homepage:
• Size: 39.1 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 6
• Metadata Files:
  • Readme: README.md

Awesome Lists containing this project

README

        
# Simple Chain

Example of how to implement a blockchain

## Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes.

### Prerequisites

Installing Node and NPM is pretty straightforward using the installer package available from the [Node.js](https://nodejs.org/en/).

### Install

To install the project dependencies run the following command

```

$ npm install

```

## Testing

Testing is very important

To test this code:

1: Open a command prompt or terminal shell after installing node.js.

2: Enter a node session, also known as a REPL (Read-Evaluate-Print-Loop).

```

node

```

3: Copy and paste your code into your node session

4: Instantiate blockchain with blockchain variable

```

let blockchain = new Blockchain();

```

5: Generate 10 blocks using a for loop

```

for (var i = 0; i <= 10; i++) {

  blockchain.addBlock(new Block("test data "+i));

}

```

6: Validate blockchain

```

blockchain.validateChain();

```

7: Induce errors by changing block data

```

let inducedErrorBlocks = [2,4,7];

for (var i = 0; i < inducedErrorBlocks.length; i++) {

  blockchain.chain[inducedErrorBlocks[i]].data='induced chain error';

}

```

8: Validate blockchain. The chain should now fail with blocks 2,4, and 7.

```

blockchain.validateChain();

```

#### Credit

- [Udacity](https://www.udacity.com/course/blockchain-developer-nanodegree--nd1309)