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What is a Blockchain?


A blockchain is a shared digital record that thousands of computers keep at the same time. Transactions are grouped into "blocks", and each block is linked to the one before it, which is where the "chain" comes from.
🔒 Every computer holds a copy, so no single person can quietly change the history.
💡 Key takeaway: blockchain swaps trust in a bank for trust in maths and the network.
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