Blockchain Guide ⛓️💰

1. What is Blockchain?

Blockchain is a distributed digital ledger where data is stored in blocks and linked in a chain securely.

2. How It Works

Block → Data + Hash → Previous Hash → Chain ⛓️

3. Key Features

Decentralized → No central authority
Immutable → Cannot be changed
Transparent → Visible transactions
Secure → Cryptography-based

4. Types of Blockchain

Public → Bitcoin, Ethereum
Private → Company internal
Consortium → Group controlled
Hybrid → Mix of both

5. Components

Blocks
Nodes
Ledger
Consensus (PoW, PoS)

6. Consensus Mechanisms

Proof of Work (PoW) → Mining
Proof of Stake (PoS) → Staking

7. Use Cases

• Cryptocurrency 💰
• Smart contracts 📜
• Supply chain tracking 🚚
• Identity verification 🪪

8. Smart Contracts

Self-executing code
Runs on blockchain
No middleman