The rapid development of blockchain technology has prompted its application to e-commerce anti-counterfeiting, personal identity authentication, transparency of transaction information, and other aspects. Meanwhile, social communication has gradually tended to be dominated by electronic data. Against this background, electronic evidence storage on blockchain came into being. This paper, firstly, through a literature review, will address the extension of the concept of digital evidence in the new era of blockchain, relevant legal provisions of China on the legal effect of electronic evidence stored in the blockchain, as well as the significance of the application of blockchain in generating digital evidence in the Chinese legal system. Secondly, through case analysis, it will analyze the first case decided in China based on digital evidence preserved by blockchain technology. Including the storage, collection, and verification procedures of electronic evidence in the blockchain, as well as technical and legal issues of applying electronic evidence stored in the blockchain. Such as the technical risk of the password being cracked, the legal problem that the authenticity of the evidence is difficult to determine, and so on. Thirdly, through a comparative law perspective, it will analyze how the USA treats electronic evidence stored in the blockchain, the ways that they solve the above problems, and whether it can achieve cross-border blockchain electronic evidence assistance. Fourthly, it will be discussed the possibility that in the coming future, while increasing the credibility of the digital evidence generation system and strengthening the evidence preservation process, the generality of judicial entities could recognize the legal status of digital evidence preserved by blockchain technology.