✅ Lesson 93: What Is a Hash in Blockchain? 🔢🔐
Let’s talk about one of the most important parts of how blockchain works — the hash.
It sounds technical, but I’ll keep it simple.
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🔍 What is a Hash?
A hash is a special code that represents data.
Think of it like a fingerprint — no two are ever the same.
It takes all the info inside a block and turns it into a unique string of numbers and letters.
Once that hash is created, it becomes the ID of the block.
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🧱 Why It’s So Powerful:
🧩 It links blocks together (each block contains the previous block’s hash)
🔒 It keeps everything secure — if someone tries to change something, the hash changes too
🚫 That instantly breaks the chain, and the network rejects it
In short: the hash is what makes blockchain tamper-proof.
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🧠 Real-Life Example:
Imagine sealing a letter with a wax stamp — if someone opens it, the seal breaks.
That’s exactly how hashes work. They protect every block like a digital seal.
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💡 Every block has a hash. Every transaction depends on it.
Without hashing, blockchain wouldn’t be secure — and crypto wouldn’t work.
Follow me if you're serious about learning how this technology really works — step by step.
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