First yard
Key Unchanging Concepts in Software Engineering

Step 1 - Equip your eyes to see the system
Analyzing the system by separating it into layers and aspects

Step 2 - See the Big Picture
What is software architecture and how does it relate to blockchain?

Step 3 - The Enormous Potential of P2P Systems
How will P2P systems change the world?

Second yard
Why do we need blockchain?

Step 4 - The Mission for Blockchain
Create a group of independent computers

Step 5 - So what is blockchain?
Four Ways to Define Blockchain

Step 6 - Understanding the Nature of Ownership
How do I prove that what I have is mine?

Step 7: Dual Spending: Blockchain Solves It
Preventing crimes that exploit vulnerabilities in P2P systems

Third yard
How does blockchain work?

Step 8 - Drawing the Blockchain Blueprint
A blueprint for managing ownership with blockchain

Step 9 - It all starts with ownership records.
Find out current ownership status through history

Step 10 - Hashing the Data
Identifying data by making it like a fingerprint

Step 11 - Where and how will the hash value be used?
Five Stories of Comparing Data and Creating Calculation Puzzles

Step 12 - Introducing Encryption Techniques
How to identify and protect user accounts

Step 13 - Nodes, do you approve the transaction?
Create a digital signature and use it for verification

Step 14 - Let's create a blockchain data structure.
Building and maintaining complete transaction data

Step 15 - How to Change a Well-Knitted Blockchain?
Adding and changing new transactions

Step 16 - How Blockchain Protects Data
Make it so that the cost of operation is high that it causes people to give up

Step 17 - How Computers Distribute Information
Did you hear the news? We got a new peer!

Step 18: A Society of Unlimited Competition in Blockchain
Verifying and adding new transactions using carrots and sticks

Step 19 - Computers must also play the line well to survive.
How nodes consistently choose at forks in the road

Step 20 - Well done.
The reward is Bitcoin
Terms of payment method for compensation

Step 21 - Completing the Blockchain Puzzle
Summary of what we learned in the previous steps

Fourth yard
What are the limitations of blockchain and how can we overcome them?

Step 22 - Look Calmly at Your Limits
Technical and non-technical limitations of blockchain

Step 23 - Blockchain Reborn
Four variations emerge to overcome limitations.

Fifth yard
Blockchain Today and Tomorrow

Step 24 - Should we try blockchain too?
Identify promising applications and verify their feasibility.

Step 25 - Envisioning the Future of Blockchain
Blockchain's evolution, achievements, and potential weaknesses

▷ Features of this book
- No prior knowledge of computer science, mathematics, programming, etc. is required.
- There are no mathematical formulas, mathematical notations, or programming codes whatsoever.
- It did not focus on specific applications such as Bitcoin, and explained from a neutral standpoint.
- Concepts were explained through everyday stories using metaphors and analogies.
- It explains the concept and working principles of blockchain and how it will evolve over 25 steps.

▷ Target audience for this book
- People who ask, 'What on earth is blockchain?'
- General public who want to understand blockchain-related discussions
- Government administrative officials who must prepare blockchain-related laws
- Developers who want to develop applications based on blockchain operating principles
- Entrepreneurs who need to understand blockchain-based businesses
- People in the financial and insurance sectors who worry that their jobs will disappear because of blockchain.

Now that Bitcoin has taken over, it's time to look at the true nature of blockchain.
Blockchain, Bitcoin, Cryptocurrency.
What is it that makes people so excited?
To put it simply, blockchain is a 'concept' implemented through a cryptocurrency called Bitcoin.
While the Bitcoin speculation phenomenon has made blockchain known to people as the "underlying technology of cryptocurrency," it actually has the potential to transform not only financial transactions but also everyday life.
Just as the Internet has completely changed our lives.

*Teaching the 'Basics of Blockchain' in 25 steps from a neutral perspective.
Some people are trying to deceive people by saying that 'blockchain will make you a lot of money'.
But what we really need to know is the 'basic principles of blockchain'.
Without this foundation, it's like building a castle on sand.

This book calmly explains the fundamental principles of blockchain without exaggeration or speculation.
We are neither obsessed with Bitcoin nor focused on specific technical details.
It covers the 'basics of blockchain that the next generation needs to know', no more, no less.
The fundamental principles of blockchain that will not be shaken even if Bitcoin and Ethereum disappear.
In the future, only those who understand this principle will be able to understand how future society operates.

*Understand operating principles through everyday stories even if you don't know math or coding.
Blockchain started with a nine-page paper by Satoshi Nakamoto.
Although the amount is not large, the barrier to understanding this paper is high due to prior knowledge.
However, anyone who reads this book can fully understand this thesis.
The reason this book makes it possible for even the average person to understand the workings of blockchain is because it explains it using everyday stories instead of complex and difficult words.
He explains software engineering with the question, "Have you ever bought a car?" and explains the underlying technology of blockchain with mailboxes and knitting.
At first, you might wonder, "What does this have to do with blockchain?" But after a while, you'll slap your knee and say, "This is a perfect analogy."
As you can see from the Amazon reader reviews, many people have already praised the unforgettable metaphor.
I hope you too will experience the incredible experience of understanding blockchain without any knowledge of mathematics, coding, or cryptography.