Elon Musk is a technology entrepreneur and engineer. He is the founder and CEO of Tesla and Spacex. As of 2019, he is the 40th richest person in the world with a net worth of $19.4 billion. Elon Musk has been an advocate of cryptocurrencies, reiterating numerous times that he believes blockchain is a much more advanced way of conducting transactions than paper money. Additionally, in 2017 he refuted rumors that he is the inventor of Bitcoin, Satoshi Nakamoto. In 2019, Elon Musk sent a tweet saying that his favorite cryptocurrency is Dogecoin.