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Learn Blockchain Programming with JavaScript

You're reading from  Learn Blockchain Programming with JavaScript

Product type Book
Published in Nov 2018
Publisher Packt
ISBN-13 9781789618822
Pages 252 pages
Edition 1st Edition
Languages
Concepts
Author (1):
Eric Traub Eric Traub
Profile icon Eric Traub

Table of Contents (10) Chapters

Preface 1. Setting up the Project 2. Building a Blockchain 3. Accessing the Blockchain through an API 4. Creating a Decentralized Blockchain Network 5. Synchronizing the Network 6. Consensus Algorithms 7. Block Explorer 8. In conclusion... 9. Other Books You May Enjoy

Creating a genesis block

One more thing that we would have to add to our blockchain data structure is the genesis block. But what is a genesis block? Well, a genesis block is simply the first block in any blockchain.

To create our genesis block, we are going to use the createNewBlock method inside of the Blockchain() constructor function. Go to the dev/blockchain.js file, and inside of the blockchain constructor function type in the following highlighted lines of code:

function Blockchain () {
this.chain = [];
this.pendingTransactions =[];
this.createNewBlock();
}

As we observed in the previous section, the createNewBlock method takes in the value of a nonce, a previousBlockHash, and a hash as parameters. Since we're using the createNewBlock method over here to create the genesis block, we are not going to have any of those mentioned parameters. Instead...

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