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𝗣𝗿𝗼𝗼𝗳 𝗼𝗳 𝗦𝘁𝗮𝗸𝗲 𝗰𝗹𝗶𝗰𝗸𝗲𝗱 𝗳𝗼𝗿 𝗺𝗲 𝘁𝗼𝗱𝗮𝘆
We started with hashes.
A hash is like a digital fingerprint for data. Same input always gives the same output. Change even one letter and the fingerprint becomes completely different. You also can't reverse it, you can't look at a hash and recover the original data. That's important, because that's how blockchains know when something has been touched.
Each block stores its own hash and the previous block's hash.
That's how the chain stays locked together. Change one block and the entire chain after it breaks. You don't 𝗳𝗶𝘅 it, you expose it.
Then we looked at how Ethereum handles this without mining.
In Proof of Stake, there's not puzzle to solve.
Instead, there are validators. Real people running nodes. They check transactions like balances, signatures, state changes. If everything makes sense, they create the block and 𝘀𝗶𝗴𝗻 it. so instead of mining, the work becomes verification and signing.
That signature matters.
If someone tampers with the block, the hash changes and the signature no longer matches. To fake it, they would have to re-sign the block and they can't, because they don't have the validator's private key.
Security comes from staking.
To become a validator, you lock 32 ETH in the system or to some smart contract. That's real money. If you act maliciously, part of your stake is destroyed. So honesty isn't just a rule, it's the cheapest option.
Validators are chosen randomly by the network.
Every 12 seconds a new block is proposed. After enough confirmation, the block becomes final.
At that point, it's not just unlikely to change, it's practically irreversible.
What I discovered is.
Proof of Stake doesn't replace work with nothing.
It replaces electricity with accountability.
You don't prove effort.
You prove alignment.
And the chain remembers.
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