Abstract: This application provides a method for issuing a digital certificate performed by a digital certificate issuing center that includes a public-private key generation module and an authentication module. The method includes: receiving a public-private key request from a node in a blockchain network; generating a public key and a private key of the node by using the public-private key generation module, and transmitting the public and private keys to the node; receiving the public key of the node and registration information of the node, and authenticating the registration information by using the authentication module; and generating, in accordance with a determination that the authentication succeeds, a digital certificate of the node by using the authentication module, and transmitting the digital certificate to the node. The embodiments of this application can improve the probative value of an issued digital certificate, thereby improving the security of data exchange in a blockchain network.

Abstract: Embodiments of this application disclose methods, systems, and devices for electronic note identifier allocation and electronic note generation. In one aspect, an electronic note identifier allocation method is performed by a processing node of a distributed computer system. The processing node receives an electronic note identifier application request initiated by a service node. The processing node generates an electronic note identifier set in response to the electronic note identifier application request. The processing node also synchronizes the electronic note identifier in the electronic note identifier set. After the synchronizing, the processing node further the electronic note identifier in the electronic note identifier set to the service node.

Abstract: Embodiments of this application disclose methods, systems, and devices for electronic note identifier allocation and electronic note generation. In one aspect, an electronic note identifier allocation method is performed by a processing node of a distributed computer system. The processing node receives an electronic note identifier application request initiated by a service node. The processing node generates an electronic note identifier set in response to the electronic note identifier application request. The processing node also synchronizes the electronic note identifier in the electronic note identifier set. After the synchronizing, the processing node further the electronic note identifier in the electronic note identifier set to the service node.

Abstract: This application provides a method for issuing a digital certificate performed by a digital certificate issuing center that includes a public-private key generation module and an authentication module. The method includes: receiving a public-private key request from a node in a blockchain network; generating a public key and a private key of the node by using the public-private key generation module, and transmitting the public and private keys to the node; receiving the public key of the node and registration information of the node, and authenticating the registration information by using the authentication module; and generating, in accordance with a determination that the authentication succeeds, a digital certificate of the node by using the authentication module, and transmitting the digital certificate to the node. The embodiments of this application can improve the probative value of an issued digital certificate, thereby improving the security of data exchange in a blockchain network.