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 “2c Shanghai China surcharge on 1c Washington single” — 64 records examined, 10 dropped by the rights gate.
Archives queried 2026-09-01 01:22 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
Night-Shining White
Han Gan · ca. 750
2c Shanghai China surcharge on 1c Washington single
Artist not stated in the record · 1919
Old Trees, Level Distance
Guo Xi · ca. 1080
4c Shanghai China surcharge on 2c Washington single
Artist not stated in the record · 1919
Wine container (zun)
Artist not stated in the record · 13th century BCE
4c Shanghai China surcharge on 2c Washington single
Artist not stated in the record · 1919
Summer Mountains
Qu Ding · ca. 1050
8c Shanghai China surcharge on 4c Washington single
Artist not stated in the record · 1919
Biographies of Lian Po and Lin Xiangru
Huang Tingjian · ca. 1095
6c Shanghai China surcharge on 3c Washington single
Artist not stated in the record · 1919
'Otua fefine (deity figure)
Ha'apai Islands artist · Early 19th century
14c Shanghai China surcharge on 7c Washington single
Artist not stated in the record · 1919
The Classic of Filial Piety
Li Gonglin · ca. 1085
12c Shanghai China surcharge on 6c Washington single
Artist not stated in the record · 1919
Self-Portrait
George Chinnery · 1825–28
10c Shanghai China surcharge on 5c Washington single
Artist not stated in the record · 1919
Wangchuan Villa
Wang Yuanqi · dated 1711
30c Shanghai China surcharge on 15c Franklin single
Artist not stated in the record · 1919
Figures, flowers, and landscapes
Chen Hongshou · one leaf dated 1627
24c Shanghai China surcharge on 12c Franklin single
Artist not stated in the record · 1919
Dragon Pine on Mount Huang
Unidentified artist · ca. 1660
$2 Shanghai China surcharge on $1 Franklin single
Artist not stated in the record · 1919
Pear Blossoms
Unidentified · ca. 1280
16c Shanghai China surcharge on 8c Franklin single
Artist not stated in the record · 1919
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. 37 matched · 24 examined · 5 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. 1273613 matched · 40 examined · 5 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 2026-09-01 01:22 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.