The blockchain became the biggest gainer in November, with 12 stocks rising more than 10%, with Wanda Information (300168) and Sifang Jingchuang (300468) rising more than 30%. At present, there are 140 stocks involved in the blockchain concept. Among them, cryptography is one of the underlying technologies and core technologies in the blockchain. It is now more important and more concerned in the practical application of blockchain. According to statistics of the same flush, in the current A-share listed companies, there are both cryptographic technology (network security) and blockchain technology, including Zhongke Information (300678), Hengjiu Technology (002808), Shenzhou Taiyue (300002), etc. 5 At home, 4 of them have been applied to the market. Only Hengjiu has blockchain application and security software hardware technology, and has been widely recognized by government customers. According to IDC's latest global semi-annual blockchain expenditure guide, it is pointed out that the global blockchain spending will reach nearly 2.9 billion U.S. dollars in 2019, which is expected to increase by 88.7% from 201.8 billion in 2018. It is expected to reach 2022. $12.4 billion.