A URL's fidelity score is calculated via the mathematical formula \(\text{Fidelity} = \frac{|\text{survived}|}{|\text{survived}| + |\text{lost}| + |\text{distortions}|} \times 100\), which defaults to \(100.0\%\) when no claims exist and persists the result rounded to one decimal place in veracity_urls.fidelity_score.