the appearance data of a target entity is collected as appearance data, where the target entity comprises a physical entity capable of accessing, as a member, a trusted protocol. appearance data is recorded in a distributed database associated with the trust protocol as an identity of the target entity. a target transaction initiated by a member node device in the trust protocol is received, where the target transaction comprises the appearance data of the target entity that is collected by the member node device and a service event that is related to the entity that is detected by the member node device. a smart contract that corresponds to the service event is invoked. based on the identity indicated by the target entity's appearance data, a service logic determined in the smart contract is executed.
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