a technologist and serial entrepreneur who has become one of the most well-known and well-respected figures in bitcoin. He is the author of “Mastering Bitcoin”, published by O’Reilly Media and considered by many to be the best technical guide to bitcoin. As an engaging public speaker, teacher and writer, Andreas makes complex subjects accessible and easy to understand. As an advisor, he helps startups recognize, evaluate, and navigate security and business risks. Andreas was also one of the first to use the phrase “The Internet of Money”, as early as 2013, to describe bitcoin as part of his speaking business. As a bitcoin entrepreneur, Andreas has founded a number of bitcoin businesses and launched several community open-source projects. He is a widely published author of articles and blog posts on bitcoin, is a permanent host on the popular Let’s Talk Bitcoin Podcast, and a frequent speaker at technology and security conferences worldwide. You can follow him on Twitter at @aantonop. His website is Antonopoulos.com.