Tencent's Internet business institute, researchers said zheng-hua zhou thunderbolt with block chain technology combined with the CDN service to calculate the second tier, it is difficult to become a mainstream in the CDN Market, according to Gartner's latest "global CDN service Market Guide" (Market Guide for CDN Services), select the 18 leading CDN companies around the world, among them, the Chinese company has five, respectively is web host technology, tencent cloud, ali cloud, blue sin, baishan,