Obscura Catalog articles: catalogue raisonné, image metadata, exports.https://catalog.obscuraflow.app/en/blogenhttps://catalog.obscuraflow.app/en/blog/certificat-d-authenticite-photographiehttps://catalog.obscuraflow.app/en/blog/certificat-d-authenticite-photographieWho declares what, what an Ed25519 signature proves, what a date is worth, how to verify a certificate online, and what a certificate of authenticity does not replace: expertise, the law. With Obscura Catalog's certificate as an example.Fri, 16 Oct 2026 00:00:00 GMTcertificate of authenticitydigital signatureattributionverificationhttps://catalog.obscuraflow.app/en/blog/lido-cidoc-crm-csv-faire-voyager-un-cataloguehttps://catalog.obscuraflow.app/en/blog/lido-cidoc-crm-csv-faire-voyager-un-catalogueExchanging a catalogue raisonné with a museum or an archive: open versus proprietary formats, CSV, LIDO and CIDOC CRM, authority identifiers, and EXIF and XMP metadata written without touching the image's pixels.Fri, 09 Oct 2026 00:00:00 GMTinteroperabilityLIDOCIDOC CRMCSVXMPopen formatshttps://catalog.obscuraflow.app/en/blog/tirages-editions-epreuves-d-artistehttps://catalog.obscuraflow.app/en/blog/tirages-editions-epreuves-d-artisteDeclared edition size and copies actually printed, print numbering, artist's and printer's proofs, provenance with its gaps, exhibition history: what a photographic catalogue raisonné must say, and what collectors, galleries and estates expect from it.Fri, 02 Oct 2026 00:00:00 GMTprinteditionartist's proofprovenanceexhibitionshttps://catalog.obscuraflow.app/en/blog/qu-est-ce-qu-un-catalogue-raisonnehttps://catalog.obscuraflow.app/en/blog/qu-est-ce-qu-un-catalogue-raisonneWork, print, file: why a photographic work is not its file, why its number must never be reassigned, and what makes a record complete. The basics of the catalogue raisonné, applied to photography.Fri, 25 Sep 2026 00:00:00 GMTcatalogue raisonnéworknumberingrecord