Gain insights into blockchain technology, delve into cryptography, explore Hyperledger Fabric, and learn to deploy networks, chaincode, and manage user identities through hands-on development.

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In this course, we will build blockchain concepts from the ground up. We will start with basic cryptography constructs, like hash functions and PKI encryption, to first build a solid base for understanding blockchain and appreciate its value. Then, we will explore the Hyperledger Fabric technology by IBM using hands-on development environment within your browser. This course is a great starting point for engineers looking to develop expertise in blockchain technology with Hyperledger Fabric specialty. In this course, you will deploy your own blockchain network, deploy chaincode on it and create an application that invokes your chaincode running in fabric network. You will also learn to manage fabric user identities in your application using wallets.

Become a Blockchain Developer

# What is blockchain?
In a blockchain system, data is stored in blocks of transactions. The most common definition is as follows:

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> A timestamped log of transactions that is replicated on multiple peers.
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# Distributed Consensus
Now, some of these peers might be evil and intentionally report a tampered version of blockchain data. The entire network uses democracy to come to a consensus on the current state of data and any non-conformant or outlier peers are ignored/blocked.

This means that in order for a blockchain network to be fair and valid, most of the nodes have to be fair. If 51% of the nodes are compromised the network is hacked. Since the networks are globally distributed, this is not a possibility.

# Data Storage in Blocks
Let's see how blockchain stores data in blocks. Each block stores a data blob(which is usually a list of transactions), its block number, and hash of the previous block:

Each block is represented by a json object here for better understanding:

![](/api/collection/5178686537990144/5741031244955648/page/5676830073815040/image/5725202142986240)

In this lesson, we well discuss the data structure of blockchain

Introduction - Understanding Blockchain

The technology pre-reqs for understanding blockchain

Blockchain data storage

Understanding the value of blockchain (Bitcoin example)

Hyperledger Fabric - Concepts

STEP 1: Deploy first Fabric Network

STEP 2: Write and deploy Chaincode

STEP 3: Create a Client Application

Blockchain Data Structure

What is blockchain? #

Distributed Consensus