Lightning-safety app with documented data provenance and latency

What lightning detection network or data provider supplies the lightning-strike data displayed in My Lightning Tracker Pro in the United States? Specifically, does the app use NLDN/Vaisala, Earth Networks, Blitzortung, another detection network, or a proprietary/aggregated source? We are evaluating the app for organizational occupational-safety use and need to understand the data source, typical latency, detection type, and location accuracy.