Blockchain for the Average Person

Imagine a notebook 📓 where you write down all transactions, like who gave money to whom.

📍 The problem in the normal world: this notebook is with one guy, who can erase something or add to it.

Blockchain does it differently:

This notebook is copied to thousands of people at once 🌍.

When you add a new page (block), everyone gets an identical copy.

Each page has a special code (hash) that only matches its content. If you change something – the code does not match and it is immediately clear that you are tampering.

📦 A simple example:

Imagine there are 10 neighbors in a village.

1️⃣ Janek gives Kasia 100 PLN 💸.

2️⃣ Janek shouts to everyone: “Hey! I gave Kasia 100 PLN!”

3️⃣ Everyone writes it down in their notebook (copy of the blockchain).

4️⃣ The village checks if Janek actually had that money.

5️⃣ If it matches → the entry goes into the notebooks of all the neighbors.

The effect?

No neighbor can deny that the transaction occurred.

You cannot change history without the knowledge of the entire village.

Why is this powerful?

✅ There is no single boss – no one can change the rules alone.

✅ Forgery is practically impossible.

✅ Everything is visible publicly – zero “black boxes”.

What is it used for?

💰 Cryptocurrencies (Bitcoin, Ethereum)

📦 Tracking goods in the supply chain

🎨 NFTs – digital artworks and collections

🏦 DeFi – banking without a bank

Curiosities:

🔹 Blocks in Bitcoin are created on average every 10 minutes, in Solana – every 0.4 seconds.

🔹 Blockchain has no “delete” button – what you write stays forever.

🔹 Anyone can join the network – you just need a computer and the internet.