Alright, imagine you have a magical notebook that you share with your friends. In this notebook, you can write down promises or agreements, like "I will give you my toy for five candies." Now, instead of just keeping the notebook with you, you let all your friends have a copy of it. Now, here comes the cool part: this notebook is so special that it doesn't belong to any one person. It's like a super special notebook that everyone can see, and it's always there for anyone to che...
