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Fact-checking real-world claims often requires complex, multi-step reasoningdue to the absence of direct evidence to support or refute them. However,existing fact-checking systems often lack transparency in theirdecision-making, making it challenging for users to comprehend their reasoningprocess. To address this, we propose the Question-guided Multi-hopFact-Checking (QACHECK) system, which guides the model's reasoning process byasking a series of questions critical for verifying a claim. QACHECK has fivekey modules: a claim verifier, a question generator, a question-answeringmodule, a QA validator, and a reasoner. Users can input a claim into QACHECK,which then predicts its veracity and provides a comprehensive report detailingits reasoning process, guided by a sequence of (question, answer) pairs.QACHECK also provides the source of evidence supporting each question,fostering a transparent, explainable, and user-friendly fact-checking process.A recorded video of QACHECK is at https://www.youtube.com/watch?v=ju8kxSldM64

QACHECK: A Demonstration System for Question-Guided Multi-Hop Fact-Checking