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. 15 shown for “Nitella formosa Allen” — 43 records examined, 0 dropped by the rights gate.
Archives queried 2026-09-08 16:10 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
Pluto and Cerberus
Tiziano Aspetti · ca. 1588
Nitella formosa Allen
Artist not stated in the record · Dec 1892
Doorknocker with a Triton and a Nereid
Artist not stated in the record · late 16th century
Nitella blankinshipii var. occidentalis (Allen) van Raam
Artist not stated in the record · 30 Jun 1894
Saint Peter Martyr Healing the Leg of a Young Man
Antonio Vivarini · ca. 1450
Nitella blankinshipii var. occidentalis (Allen) van Raam
Artist not stated in the record · 30 Jun 1894
Nitella multipartita var. suberecta Allen
Artist not stated in the record
Nitella paucicostata Allen
Artist not stated in the record · 10 Jul 1894
Nitella capitulifera Allen
Artist not stated in the record · Sep 1895
Nitella blankinshipii var. missouriensis (Allen) van Raam, nom. inval.
Artist not stated in the record · Jun 1895
Nitella morongii Allen
Artist not stated in the record · 15 Jul 1893
Nitella japonica Allen
Artist not stated in the record
Nitella orientalis Allen
Artist not stated in the record
Nitella orientalis Allen
Artist not stated in the record
Nitella orientalis Allen
Artist not stated in the record
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. 3 matched · 3 examined · 0 dropped by the rights gate. Kept only where isPublicDomain === true and a file URL was published.3 shown - Smithsonian Open Access API (api.si.edu)Rights field:
content.descriptiveNonRepeating.metadata_usage.access. 29298 matched · 40 examined · 0 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 2026-09-08 16:10 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.