Xiaokuan Zhang

Understanding and Detecting Mobile Ad Fraud Through the Lens of Invalid Traffic

2021

Along with gaining popularity of Real-Time Bidding (RTB) based programmatic advertising, the click farm based invalid traffic, which leverages massive real smartphones to carry out large-scale ad fraud campaigns, is becoming one of the major …

Demystifying Private Transactions and Their Impact in PoW and PoS Ethereum

2025 · arXiv (Cornell University)

In Ethereum, private transactions, a specialized transaction type employed to evade public Peer-to-Peer (P2P) network broadcasting, remain largely unexplored, particularly in the context of the transition from Proof-of-Work (PoW) to Proof-of-Stake (PoS) consensus mechanisms. To …