Understanding Blockchain Consensus Mechanisms: PoW vs PoS

“How do we know which transactions are valid? 🤔”
Explain: “Proof of Work = miners solve puzzles (Bitcoin). Proof of Stake = validators lock coins to verify (Ethereum 2.0).”
Close: “Both keep blockchain safe 🔐, but PoS is faster & eco-friendly 🌱

For Educational purpose only.

- Proof of Work (PoW)

Used by Bitcoin and early blockchains.

Miners solve complex puzzles to validate transactions.

Requires huge electricity & hardware (energy intensive).

More tested & secure, but slower and costly.

🔑 Proof of Stake (PoS)

Used by Ethereum 2.0, Cardano, Solana etc.

Validators are chosen based on how much crypto they stake (lock).

Energy efficient, no heavy hardware needed.

Faster and cheaper, but some fear it favors the rich (big stakers).

👉 Simple difference:

PoW = Work hard with electricity ⚡

PoS = Lock coins and get selected 🔒

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