no it is not linked list , as for every merkel data in original blockchain it is different .

for more info check blockchain transactions and the height of the trees there is change in the number of front zero very time ..

starting was done with 00000 zero now it reached a height of 21 zeros .

I just wanted to mention (for anyone who is getting the Error: Cannot find module 'sha256' function) that NPM is not needed for the Crypto module because it is a native module that is available via Node.js. To include Crypto and to create the hash, all that is needed is this code:

‘use strict’;

const crypto = require(‘crypto’);

const secret = ‘abcdefg’;
const sha1 = crypto.createHmac(‘sha256’, secret)//create the hash
.update(‘I love cupcakes’)
.digest(‘hex’);
console.log(sha1);

Then in the constructor function that is within the Block class, instead of calling the getHash() function to create the hash simply append sha1 (hash) to the constructor like so:

this.hash = this.sha1;
…instead of this.hash = this.getHash();

This is what worked for me.

Thanks for helping me to gain a better understanding of what Blockchain is!

Cheers!

Juliette

Yes, you are right!
Sorry I forgot to mention