this book introduces blockchain from bitcoin and expounds it from 50 problems.It has six chapters:Chapter 1, the afterlife and present life of bitcoin;Chapter 2, what is a blockchain;Chapter 3, do you really know Facebook's Diem;Chapter 4, why blockchain is a financial revolution first;Chapter 5, how blockchain will change all walks of life;Chapter 6, what is the relationship between blockchain and me.50 lectures on blockchain general education, combined with news, interesting stories an...