What Is Blockchain?

Blockchain is a secure, decentralized digital ledger that records transactions across many computers. It’s tamper-proof, transparent, and doesn’t need a middleman like a bank.

How It Works:

1. A transaction (e.g., sending cryptocurrency) is broadcast to a network.

2. Computers (nodes) verify it using rules.

3. Verified transactions form a block with a unique code (hash).

4. Blocks link to form a chain, secured by cryptography.

5. Nodes agree on validity using methods like Proof of Work or Proof of Stake.

Why It’s Secure:

- Cryptography locks data.

- Decentralization prevents single-point hacks.

- Once added, data can’t be changed easily.

Uses:

- Cryptocurrencies ($BTC Bitcoin, $ETH Ethereum)

- Smart contracts (self-running agreements)

- Supply chain tracking

- Secure digital IDs

- Fraud-proof voting

Why It Matters:

Blockchain makes transactions faster, cheaper, and trustworthy, transforming finance, supply chains, and more.