This document provides an introduction to disruptive blockchain technology. It discusses the history of bitcoin and how the first blockchain network was launched in 2008. It defines blockchain as a growing list of linked data blocks. Blockchain technology features include cutting out middlemen, building consensus across participants, and creating witnesses to published information. Key features include immutable transparent data storage without intermediaries and a consistent state across all participants. Challenges include high energy consumption, scalability issues, and risks of money laundering and personal responsibility. The document outlines potential applications of blockchain in digital currency, securities, record keeping, and smart contracts.