01 Preface It has been almost 50 years since the birth of the TCP/IP protocol in 1974. Now that the regulatory system is becoming stricter and the Internet infrastructure is increasingly complete, the anonymity that was widely publicized on the Internet is no longer vulnerable. The blockchain is very similar to the early Internet, emphasizing privacy and anonymity. In 1991, the concept of blockchain was first proposed. In 2008, Satoshi Nakamoto applied blockchain technology to Bitcoin for the...