Once upon a time, there was a magical technology called blockchain. It was a special kind of ledger that kept track of things like money, contracts, and even ownership of property. But what made blockchain so special was that it was completely decentralized, meaning that no single person or group controlled it. One day, a group of friends named Alice, Bob, and Charlie wanted to make a bet on who could run the fastest. They decided to use blockchain to keep track of their bet. They each put so...