ctscout research

Measured properties of Certificate Transparency as an entity-resolution source, from deterministic scripts over public data. Pages regenerate weekly from the live warehouse.

• From crt.sh to CTScout — the post: why the collector exists, what the validation measures, and how the failures turned into a second dataset.
• Who Is Behind a Domain? — what six months of organization-validated certificates can and cannot say about which legal entity stands behind a domain.
• Who Runs Your Website? — vendors whose certificates sit on other companies' domains, confirmed with DNS, with precision per vendor.
• Who Uses What? — the customers of each confirmed vendor: how many, in which countries, how many issue securities, which vendors travel together, and the share of domains carrying only a vendor's certificate. One page per vendor: Salesforce, Microsoft, Adobe Systems, Criteo Technology, Thomson Reuters, Hong Kong Sar Government, Tessitura Network, Cdnetworks, Powerschool Group, Yahoo Holdings.

Data behind each note: coverage, matching difficulty, GLEIF join, decomposition, vendor footprint, vendor series, vendor customers profile.