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. 24 shown for “Oko (side-blown horn)” — 64 records examined, 12 dropped by the rights gate.
Archives queried 2026-09-06 17:34 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
Oko (side-blown horn)
Artist not stated in the record · 19th century
Hunting horn
Temne artist · Late 15th century
Oko
Artist not stated in the record · 19th century
Thymus sp.
Artist not stated in the record · 2 Sep 1965
Oliphant (side-blown horn)
Temne or Bullom artist(s) · ca. 1490–1530
Sapium glandulosum (L.) Morong
Artist not stated in the record · 21 Feb 1966
Oko (side-blown trumpet)
Ìgbèsànmwà (ivory- and wood- carving guild) artists · 18th–19th century
Gentiana punctata L.
Artist not stated in the record · 29 Jun 1937
Oko (side-blown trumpet)
Ìgbèsànmwà (ivory- and wood- carving guild) artists · 19th century
Nectomys rattus
Artist not stated in the record · 26 Apr 1937
Side-blown Trumpet
Artist not stated in the record · 19th century
Leptochilus ellipticus (Thunb.) Noot.
Artist not stated in the record · Aug 1913
Horn
Artist not stated in the record · late 19th century
Rourea sp.
Artist not stated in the record · 13 Jul 1933
Horn
Artist not stated in the record · late 19th century
Plukenetia polyadenia Müll. Arg.
Artist not stated in the record · 13 Jul 1933
Transverse Flute in E
Artist not stated in the record · late 18th or early 19th century
Trichostomum tenuirostre (Hook. & T. Taylor) Lindb.
Artist not stated in the record · 28 Aug 1956
Yuge
Artist not stated in the record · ca. 1890
Physcomitrella patens (Hedw.) Bruch & Schimp.
Artist not stated in the record · 18 Nov 2010
Horn
Artist not stated in the record · late 19th century
Erythroxylum citrifolium A. St.-Hil.
Artist not stated in the record · 19 Feb 1968
Horn
Artist not stated in the record · late 19th century
Stachytarpheta cayennensis (Rich.) Vahl
Artist not stated in the record · 21 Feb 1966
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. 32 matched · 24 examined · 6 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. 75 matched · 40 examined · 6 dropped by the rights gate. Kept only where metadata_usage.access === "CC0" and an image resource was published.12 shown
These figures describe the pass run at 2026-09-06 17:34 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.