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Introduction to blockchain technology and cryptocurrency

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This document provides clear and well-structured class notes on Blockchain and Cryptocurrency. It covers basic concepts, working principles, types of cryptocurrencies, advantages, limitations, and real-world applications. Suitable for undergraduate students, especially 3rd and 4th year learners. Easy language with organized headings for quick understanding.

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Blockchain and digital currencies
The introduction
The way we live and work in today's digital world is being transformed by technology.
Blockchain, the technology that underpins cryptocurrencies, is one of the most significant
innovations. Cryptocurrency is a digital form of money that makes use of the secure blockchain
technology. What exactly is blockchain?
Blockchain is a secure and transparent digital record book that stores information.
The data is distributed across a large number of computers, or nodes, rather than being stored
in one location. A block is created for each new piece of information or transaction, and these
blocks are linked together like a chain—hence the name Blockchain.
Key Characteristics of Blockchain
Decentralization
It is not managed by a single authority. The system is jointly controlled by many users (nodes).
Transparency
The transactions are open and transparent because anyone can see them.
Security
A unique code known as a hash is contained in each block. The system will reject any attempt
to alter the data if the hash changes.
Immutability
Once information is added, it cannot be changed or deleted.
How Blockchain Works
A transaction is made (for example, sending money).
The deal is sent to the network. The transaction is validated by the network using specific rules.
The transaction is added to a block once it has been verified. The chain gets a new block. The
transaction is now final.
What exactly is cryptocurrency?
Blockchain-based digital money is known as cryptocurrency. It is not governed by any bank or
government. Bitcoin is the most well-known cryptocurrency, but there are numerous others,
including Ethereum, Litecoin, and Ripple.
The Workings of Cryptocurrency
Cryptocurrency is used for investments and online payments. Transactions are verified by
computers called miners.
In order to verify transactions, miners solve intricate math problems. The transaction is recorded
in the blockchain once it is confirmed.
Advantages of Cryptocurrency and Blockchain
Low Transaction Fees
Compared to bank transfers, cryptocurrency transfers typically cost less.
Transaction Speed
Money can be sent to another country immediately.
Private and safe
Transactions are safe and the identity of users can stay private
No Third Party
There is no need for financial institutions or banks.
Financial Freedom for All

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Uploaded on
January 21, 2026
Number of pages
2
Written in
2025/2026
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Class notes
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