想像一下，你和朋友們共用一本日記。每天有人寫下發生的事情，然後大家都在旁邊簽名確認。這樣一來，任何人都不能偷偷擦掉或修改內容，因為所有人都能看見，也都有簽名為證。
區塊鏈 BlockChain：一本大家的日記
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