OpenTwo archives, queried live.
Every record below comes from The Met or Smithsonian Open Access and was filtered on that archive’s own rights field before it reached this page. 23 shown for “Christian Gottlob Hammer” — 64 records examined, 32 dropped by the rights gate.
Archives queried 2026-08-27 15:34 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
View of Dresden from the West
Christian Gottlob Hammer · 1833
Christian Gottlob Dieze
Artist not stated in the record · 1798
Clavichord
Christian Kintzing · 1763
Portrait of Abraham Gottlob Werner (1749-1817)
Mitchell, Edward 1773-1852 · 1852
Design for a Mantlepiece
Christian Gottlob Mietzsch · mid-18th–late 18th century
Bromus racemosus L.
Artist not stated in the record · Ende Juni 1901
Pianoforte Guittar (Keyed cittern/English Guittar)
Christian Claus · ca. 1785
Bromus arvensis L.
Artist not stated in the record · Ende Juni 1901
Pianoforte Guittar (Keyed cittern/English guittar)
Christian Claus · 1783–89
Lobed ladle with floral scrolls
Artist not stated in the record · late 7th-early 8th century
Court Official with Hammer and Staff
Ìgùn Ẹ́rọ̀nwwọ̀n (brass-casting guild) artists · Late 19th–early 20th century
Passer domesticus
Artist not stated in the record · 22 Mar 2008
Jacob and the Angel
Johann Jacob Eybelwieser · late 17th–mid-18th century
Passer domesticus domesticus
Artist not stated in the record · 22 Mar 2008
Standing Buddha
Artist not stated in the record · early 9th century
Hirundo rustica rustica
Artist not stated in the record · 22 Mar 2008
The Martyrdom of Saint Barbara
Lucas Cranach the Elder · ca. 1510
Hirundo rustica rustica
Artist not stated in the record · 22 Mar 2008
Square Piano
Johann Christoph Jaeckel and Christian Jaeckel · 1790
Passer domesticus domesticus
Artist not stated in the record · 22 Mar 2008
Francesco d'Este (born ca. 1429, died after 1486)
Rogier van der Weyden · ca. 1460
Clock with Chinoiserie Pattern
Meissen Porcelain Manufactory, German, active from 1710 to the present · 1730–1733
Fortepiano
Conrad Graf · ca. 1838
Where these records came from.
Two archives are wired, and only two. Each one is filtered on its own rights field — never on a title match, and never on the presence of an image file.
- The Met Collection API (Open Access)Rights field:
isPublicDomain. 35 matched · 24 examined · 3 dropped by the rights gate. Kept only where isPublicDomain === true and a file URL was published.12 shown - Smithsonian Open Access API (api.si.edu)Rights field:
content.descriptiveNonRepeating.metadata_usage.access. 22191 matched · 40 examined · 29 dropped by the rights gate. Kept only where metadata_usage.access === "CC0" and an image resource was published.11 shown
These figures describe the pass run at 2026-08-27 15:34 UTC, during this request. A completed pass is kept for 24 hours and replayed for an identical search, which is what keeps repeated queries inside Smithsonian’s 30-requests-per-hour allowance. A pass in which either archive failed to answer is never kept — an outage must not be replayed as though it were a finding about the catalogue.
Wikimedia Commons and the Library of Congress are deliberately not wired. Wikimedia was confirmed, on a live query, to return CC-BY material inside the same result set as genuine public domain works, and filtering it safely has not been designed yet. loc.gov was blocked by bot detection during the source evaluation, so its rights vocabulary has never been observed — and nothing here is built on a field nobody has read.
An image file is a rights claim. It never travels without its field.