Blockchain, the key to the world of cryptocurrencies-a phrase that sounds like a promise of wealth. But what exactly is Blockchain? Unfortunately, in most books, articles, and discussions, it is either explained in a way that’s hard to understand or oversimplified with unnecessary emotional baggage, presented either technically or ideologically. Some see Blockchain as a savior from greedy bankers, while others view it as a tool for building cryptocurrencies that undermine central banks. Which image is closer to reality? The story of Blockchain is not just a tale of mathematical experiments. It’s primarily a story of the age-old attempt to record human activities and the value that flows from them. This time, however, the goal is to make it accessible to everyone on equal terms.