A service platform obtains order data of an order placed by a target user through a user interface and history data of the target user associated with one or more user interface operations for placing the order, where the history data includes page code of one or more pages of the user interface associated with the one or more user interface operations. The service platform generates, based on the history data and the order data, usage data of the target user. The service platform determines a digital digest of the usage data. The service platform sends the digital digest to a blockchain network associated with a blockchain, where the digital digest is verified by a blockchain node of the blockchain network, and where the digital digest is stored on the blockchain in response to a determination that the digital digest passes a verification.