Towards Trust and Reputation as a Service in a Blockchain-based Decentralized Marketplace (2403.04779v1)
Abstract: Motivated by the challenges inherent in implementing trusted services in the Society 5.0 initiative, we propose a novel trust and reputation service for a decentralized marketplace. We assume that a Smart Contract is associated with each transaction and that the Smart Contract is responsible for providing automatic feedback, replacing notoriously unreliable buyer feedback by a more objective assessment of how well the parties have fulfilled their obligations. Our trust and reputation service was inspired by Laplace Law of Succession, where trust in a seller is defined as the probability that she will fulfill her obligations on the next transaction. We offer three applications. First, we discuss an application to a multi-segment marketplace, where a malicious seller may establish a stellar reputation by selling cheap items, only to use their excellent reputation to defraud buyers in a different market segment. Next, we demonstrate how our trust and reputation service works in the context of sellers with time-varying performance by providing two discounting schemes wherein older reputation scores are given less weight than more recent ones. Finally, we show how to predict trust and reputation far in the future, based on incomplete information. Extensive simulations have confirmed our analytical results.
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