Happy weekend guys.

🔗 What Is Blockchain (Deeper Explanation)
Blockchain is a distributed database shared across many computers (called nodes).
Instead of one central server controlling data (like a bank), thousands of computers store the same copy of the records.
This makes it:
Decentralized
Secure
Transparent
Resistant to censorship

🧱 Structure of a Block
Each block contains:
Transaction Data
Example:
Wallet A sends 0.5 BTC to Wallet B
Wallet C sends 100 USDT
Timestamp
The exact time the block was created.
Hash
A unique digital fingerprint of the block.
Previous Block Hash
This connects the block to the one before it.

👉 Because each block contains the previous block’s hash, changing one block would break the entire chain.
That’s why blockchain is very hard to hack.

🌍 How Transactions Are Verified
This depends on the blockchain type. The two most common systems are:

1️⃣ Proof of Work (PoW)
Used by Bitcoin
Miners solve complex math problems
Requires powerful computers
Very secure but uses high electricity

2️⃣ Proof of Stake (PoS)
Used by Ethereum (now)
Validators lock up crypto (stake it)
More energy efficient
Faster transactions

🔐 Why Blockchain Is Secure
Data is encrypted
Thousands of nodes confirm transactions
No single point of failure
Extremely difficult to alter past data
To hack Bitcoin, you would need to control over 50% of the entire network (almost impossible).