Blockchain has the potential to change the way that the world approaches data. Develop Blockchain skills by understanding the data model behind Blockchain by developing your own simplified private blockchain.
These instructions will get you a copy of the project up and running on your local machine for development and testing purposes.
Installing Node and NPM is pretty straightforward using the installer package available from the (Node.js® web site)[https://nodejs.org/en/].
- Use NPM to initialize your project and create package.json to store project dependencies.
npm init
- Install crypto-js with --save flag to save dependency to our package.json file
npm install crypto-js --save
- Install level with --save flag
npm install level --save
To test code: 1: Open a command prompt or shell terminal after install node.js. 2: Enter a node session, also known as 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();