This part introduction presents an overview of key concepts covered in the subsequent chapters of this first part of this book. The part discusses the main characteristics of the blockchain and the resulting changes in uses, focusing the analysis on non‐centralization, disintermediation, and prospects for the evolution and improvement of the blockchain. As a secure, non‐centralized, peer‐to‐peer ... [Show full abstract] ledger technology, the blockchain makes it possible to restructure entire parts of socioeconomic operating modes. Since the creation of the Bitcoin protocol in 2009, the blockchain technology has already undergone several phases of evolution. Initially, the blockchain with Bitcoin mainly allowed a timestamping mechanism for non‐centralized transactions using a peer‐to‐peer network and it was only with the appearance of the second generation of blockchain, focused on the deployment of smart contracts, such as the Ethereum blockchain created in 2014, that the prospects for disintermediation were really felt.