This book explains a big idea in a simple way. It's about boxes that keep things safe-like coins and messages-and how those boxes can stick together in a line to make a strong chain. You'll learn how keys keep boxes locked, how friends can add their own boxes, and how everyone works together to keep the chain safe and fair. A clear, calm way to explore how we stay safe and share with others. No buzzwords. Just boxes, chains, and a smart little story.
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