The ledger & the double-spend problem
“A ledger everyone holds is a ledger no one can forge.”
Strip away the jargon and a blockchain is a receipt book: pages (blocks) of transactions, each page cryptographically sealed and chained to the one before. Change any old entry and every seal after it visibly breaks. That's the "immutability" you hear about — not magic, just math that makes tampering loud.
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Education only — not financial, investment, legal, or tax advice. Never share your seed phrase with anyone.