Recently, Zhang Yifeng, Dean of China Banknote Blockchain Technology Research Institute, said at the first FinTech Day blockchain sub-forum of Weizhong Bank that the open license chain (public alliance chain) is the current stage to promote the wider application of blockchain. Path selection, and distributed identity is an important infrastructure for large-scale application of blockchain. Today, the number of real blockchain users is still limited. Therefore, the blockchain technology really needs to be applied on a large scale. An important problem is that it cannot be bypassed, that is, distributed identity.