Title: Blockchain-based Smart Advertising Network with Privacy-preserving Accountability
Date: July 28, 2020
Time: 1:30 PM
Place: REMOTE PARTICIPATION
Supervisor(s): Shen, Sherman
In a smart advertising network (SAN), a broker builds user profiles from its wealth of user data, manages advertisements for retailers, and disseminates the advertisements through multiple channels. However, the broker often provides insufficient transparency explanations of advertising activities, which may result in the increasing popularity of ad-blocking software and lower advertising investments from retailers. In this seminar, we propose a blockchain-based Smart Advertising Network with Privacy-preserving Accountability (SANPA). Specifically, we design a composite Succinct Non-interactive Argument (SNARG) system, that commits advertising policies as cryptographic authenticators in a smart contract. By doing so, SANPA is compatible with the existing SAN without posing prohibitive implementation cost over the blockchain architecture. Users or retailers can require explanations of an advertising activity by sending a challenge to the smart contract. With the succinctness and privacy preservation of the SNARG system, the smart contract can efficiently verify whether the challenged advertising activity follows committed advertising policies without exposing user profile privacy. If any misconduct is identified, the contract enforces public accountability on the broker by confiscating its cryptocurrency deposits. We conduct extensive experiments to provide both on-chain and off-chain benchmarks, which demonstrates the application feasibility of SANPA.