Abstract

Decentralized delivery of physical or digital items via a sequence of handover actions is common in telecommunication, supply chains, snail mail, email, etc. In decentralized delivery systems, items are passed between carriers, from source to destination, without a central control, and often, by carriers that belong to different organizations. Delivery failures could be due to faults or the result of malicious actions like fraud, e.g., in International Revenue Share Fraud (IRSF), international phone calls are dropped by fraudulent telecommunication carriers. Tracking item delivery can help detect faults and fraudulent behavior. But the sequence of carriers used for delivery of a specific item is often business confidential, and should be revealed only in case of fraud. In this paper, we demonstrate a blockchain-based system, Fraud Buster, for confidential tracking of routes in a decentralized delivery system. In particular, we illustrate the ability to track handover of calls while preserving business confidentiality when detecting where calls were dropped. The paper makes the use of a permissioned blockchain for tracking the required information yet revealing only the necessary information, when a fraud occurs.