What is Blockchain?

Understanding Blockchain with a Story

Traditional vs Blockchain Accounting

Imagine you need to keep accounts with a group of friends:

Traditional Way (Centralized):

You chose Xiao Ming as accountant
All accounts are in Xiao Ming's book
Problem: What if Xiao Ming cheats?

Blockchain Way (Decentralized):

Everyone has a ledger
Every transaction is broadcast to everyone
Everyone records simultaneously
Problem: Who remembers most accurately? Everyone verifies together!

Core Principles of Blockchain

1. 🧱 What is a Block?

Like a row in an Excel spreadsheet, each block contains:

┌─────────────────────────────┐
│         Block #12345         │
├─────────────────────────────┤
│ Timestamp: 2026-03-30 10:00│
├─────────────────────────────┤
│ Tx1: Alice → Bob 1 BTC     │
│ Tx2: Charlie → Alice 0.5 BTC│
│ Tx3: ...                   │
├─────────────────────────────┤
│ Prev Block Hash: abc123... │
│ This Block Hash: def456... │
└─────────────────────────────┘

2. 🔗 How is the Chain Formed?

Block12345 → Block12346 → Block12347 → ...
     ↓            ↓            ↓
   Hash Ref    Hash Ref    Hash Ref

Each block contains the "fingerprint (hash) of the previous block", like DNA!

Blockchain Types

Type	Examples	Features	Speed
Public Chain	Bitcoin, Ethereum	Anyone can participate	Slow
Consortium Chain	BSC, Polygon	Permissioned nodes	Fast
Private Chain	Enterprise internal	Single party control	Fastest

What is BSC (Binance Smart Chain)?

BSC = Binance Smart Chain

Analogy:
- Ethereum = Toll highway
- BSC = Another highway built by Binance
  - Cheaper tolls
  - Faster
  - Compatible with Ethereum

PulsePay runs on BSC, like operating services on this highway.

Next Steps

• Crypto Basics - Learn about "currency" on blockchain
• What is DeFi? - Learn about decentralized finance