High-value datasets on data.europa.eu: what a machine sees, and what Member States say
7 of the 27 Member States for which the European data portal identifies no high-value dataset n = 27 Member States, 27,972 HVD records
Studies
Original research that measures what practitioners take on faith. New studies are added as they are published.
11 studies
Do the registration numbers on Airbnb listings exist in the official registries? Spain and New York around 20 May 2026
6.6% of Airbnb listings in five Spanish areas with a well-formed tourist-dwelling number show one we could not trace to any registered dwelling n = 2,066 of 31,222
Past the static deadlines: NeTEx on five European access points, checked against open schemas
8 of 34 timetable datasets from five European national access points are fully valid against the NeTEx XSD, all of them French n = 34 datasets, 5 access points
What can a machine verify on Spain's public-sector websites?
32.9% of Spain's public-sector home pages on HTTPS send HSTS n = 1,688 of 5,130
Do Google's AI Overviews and AI Mode keep up with Spanish rule changes? About one answer in twenty did not
5.0% of Google AI Overview answers on recently changed Spanish rules were outdated or wrong n = 12 of 240
Do AI-generated images on Wikimedia Commons carry provenance marks?
50.2% of AI images uploaded to Wikimedia Commons in June–July 2026 carry a machine-readable AI mark n = 313 uploads
Who publishes attestations on PyPI and npm — and who stopped?
23.2% of the top PyPI projects attest their latest version n = 3,479 of 14,995
Multilingual quality of drug names in Wikidata
≈0.9% of Wikidata's multilingual drug labels are wrong, a lower bound n = 34,207 labels
Do AI provenance marks survive common image, video and audio pipelines?
124/124 pixel or container rewrites removed the embedded C2PA manifest n = 124 rewrites
Spoofed AI crawlers
39.3% of requests claiming to be an AI or search crawler were spoofed n = 16,548 claims, 3 sites
Conformance of open-source Verifactu implementations
28.6% of the files presented as valid Verifactu records contain an error n = 35 files
No study matches these filters.