A computer-implemented method, medium, and system are disclosed. In one computer-implemented method performed by a blockchain node in a blockchain network, a traffic access request triggered by event tracking is received at the blockchain node. In response to receiving the traffic access request, traffic recording logic in a smart contract published on a blockchain is invoked at the blockchain node. Traffic statistic information of current traffic access is recorded in response to invoking the traffic recording logic. The traffic statistic information is published to the blockchain.