Jimmy Song is a Bitcoin advocate, developer, educator, and author.  He has been contributing to open-source Bitcoin projects since 2013 and has written several books on the digital asset and its underlying technology, including The Little Bitcoin Book: Why Bitcoin Matters for Your Freedom, Finances, and Future , Thank God for Bitcoin: The Creation, Corruption and Redemption of Money and Programming Bitcoin: Learn How to Program Bitcoin From Scratch.  He argues that the blockchain’s sole use case is for sound money, which Bitcoin fulfills perfectly.