A Digital Twin-Based Ship Reputation Value Management Scheme Over Blockchain in the Internet of Ships

Digital twin technology can offer support to ship intelligence by the elaboration of massive data. However, false data may hinder the expected functions and even lead to serious navigation accidents. Therefore, credibility of data is a crucial issue that demands urgent attention. To this end, we propose an information credibility determination scheme suitable for the digital twin framework. This scheme combines the subjective logic model with the Dempster-Shafer theory. Firstly, based on the historical reputation values and interaction records of broadcasting ships, this scheme generates an initial subjective logic model via a smart contract. Subsequently, the model undergoes dynamic updates by taking into account the viewpoints provided by other verified ships. Then, the Dempster-Shafer theory is employed to fuse viewpoints and obtain the final information credibility evaluation results. In addition, a Delegated Proof of Stake consensus algorithm is designed___combined with an evolutionary game mechanism. The aim is to incentivize witness vote ships to select witness ships with high reputation values____to obtain the right to create blocks, thus enhancing overall security and reliability. Simulation results show that the proposed scheme can effectively identify false information, resist the attack of malicious ships, and significantly improve robustness and credibility.