Post

Everyone says, “Blockchain is immutable.” But the real question is: What exactly prevents manipulation? How are blocks actually locked together? The answer is one word: hashing Hashing means: You take any kind of data — text, image, video, anything — run it through a mathematical function, and it always outputs a fixed-length string 📌 It doesn’t matter how big or small the input is 📌 The output length is always the same 📌 Even a tiny change in the input completely changes the output So what happens in a blockchain? Each block has its own unique hash — like a fingerprint. When a new block is created: 🔗 The previous block’s hash is included inside the new block. That means if someone tries to modify an old block, its hash changes — and that breaks the entire chain after it That’s why we say: Blocks are locked together through hashes An even more important point: The probability that two different pieces of data, produce the exact same hash is practically zero, This rare event is called a hash collision, Resistance to collisions is what gives blockchain its security, Blockchain didn’t become secure because of locks or guards, It became secure because of mathematics Not because someone is watching — but because tampering with it isn’t worth the effort. #BlockchainExplainedSimple