diff --git a/docs/contracts.md b/docs/contracts.md
index 2cf4e7f..8806c9e 100644
--- a/docs/contracts.md
+++ b/docs/contracts.md
@@ -230,6 +230,11 @@ The music data file of `nnnotes music-data`, `nnnotes.music-data/1`
 ([schema/music-data.schema.json](schema/music-data.schema.json)), names its format in a `format` field; it is
 described in [music-data.md](music-data.md).
 
+The metadata-only Sprite observation file, `nnnotes.observed-sprite-geometries/1`
+([schema/sprite-geometries.schema.json](schema/sprite-geometries.schema.json)),
+retains original geometry and input hashes independently of public artwork
+bitmaps; usage and evidence scope are in [sprite-geometries.md](sprite-geometries.md).
+
 ## Store
 
 The store is a directory, and the cache of all stage work:
diff --git a/docs/schema/sprite-geometries.schema.json b/docs/schema/sprite-geometries.schema.json
new file mode 100644
index 0000000..2f10905
--- /dev/null
+++ b/docs/schema/sprite-geometries.schema.json
@@ -0,0 +1,59 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "urn:nnnotes:schema:sprite-geometries",
+  "title": "nnnotes.observed-sprite-geometries/1",
+  "type": "object",
+  "required": ["schema", "region", "client", "catalogSha256", "source", "sprites"],
+  "properties": {
+    "schema": {"const": "nnnotes.observed-sprite-geometries/1"},
+    "region": {"type": "string", "minLength": 1},
+    "client": {"type": "object", "properties": {"versionName": {"type": "string"}, "versionCode": {"type": "integer"}}},
+    "catalogSha256": {"$ref": "#/$defs/sha"},
+    "source": {
+      "type": "object", "required": ["kind", "catalogs", "native", "runtimeVerified"],
+      "properties": {
+        "kind": {"const": "observed-nnnotes-sprite-metadata"},
+        "catalogs": {"type": "object", "required": ["remote"], "additionalProperties": {"$ref": "#/$defs/fingerprint"}},
+        "native": {"type": "object"},
+        "runtimeVerified": {"const": false},
+        "publicBitmaps": {"$ref": "#/$defs/file"}
+      }
+    },
+    "sprites": {
+      "type": "object", "minProperties": 1,
+      "additionalProperties": {
+        "type": "object", "required": ["geometry", "source"],
+        "properties": {
+          "geometry": {
+            "type": "object", "required": ["rect", "textureRect", "textureRectOffset", "pivot", "border", "pixelsPerUnit", "settingsRaw", "downscaleMultiplier"],
+            "properties": {
+              "rect": {"$ref": "#/$defs/rect"}, "textureRect": {"$ref": "#/$defs/rect"},
+              "textureRectOffset": {"$ref": "#/$defs/xy"}, "pivot": {"$ref": "#/$defs/xy"},
+              "border": {"type": "object", "required": ["x", "y", "z", "w"], "additionalProperties": {"type": "number"}},
+              "pixelsPerUnit": {"type": "number", "exclusiveMinimum": 0},
+              "settingsRaw": {"type": "integer", "minimum": 0},
+              "downscaleMultiplier": {"type": "number", "exclusiveMinimum": 0}
+            }
+          },
+          "source": {
+            "type": "object", "required": ["key", "name", "assetFile", "pathId", "catalogSha256", "bundles"],
+            "properties": {
+              "key": {"type": "string", "minLength": 1}, "name": {"type": "string"},
+              "assetFile": {"type": "string", "minLength": 1},
+              "pathId": {"type": "string", "pattern": "^-?[0-9]+$"},
+              "catalogSha256": {"$ref": "#/$defs/sha"},
+              "bundles": {"type": "array", "minItems": 1, "items": {"$ref": "#/$defs/file"}}
+            }
+          }
+        }
+      }
+    }
+  },
+  "$defs": {
+    "sha": {"type": "string", "pattern": "^[a-f0-9]{64}$"},
+    "fingerprint": {"type": "object", "required": ["sha256", "size"], "properties": {"sha256": {"$ref": "#/$defs/sha"}, "size": {"type": "integer", "minimum": 0}}},
+    "file": {"allOf": [{"$ref": "#/$defs/fingerprint"}, {"type": "object", "required": ["file"], "properties": {"file": {"type": "string", "minLength": 1}}}]},
+    "xy": {"type": "object", "required": ["x", "y"], "properties": {"x": {"type": "number"}, "y": {"type": "number"}}},
+    "rect": {"allOf": [{"$ref": "#/$defs/xy"}, {"type": "object", "required": ["width", "height"], "properties": {"width": {"type": "number", "minimum": 0}, "height": {"type": "number", "minimum": 0}}}]}
+  }
+}
diff --git a/docs/sprite-geometries.md b/docs/sprite-geometries.md
new file mode 100644
index 0000000..1ce9190
--- /dev/null
+++ b/docs/sprite-geometries.md
@@ -0,0 +1,37 @@
+# Original Sprite geometry
+
+`nnnotes sprite-geometries` reads actual Sprite metadata through the same nnnotes
+Exporter used for UI packs. It downloads only the explicitly selected bundle
+closures and never decodes textures or writes game artwork into the repository.
+
+```sh
+nnnotes --config private.toml --catalog saved-catalog.bin sprite-geometries \
+  --keys selected-keys.json -o ../private-ui/sprite-geometries.json
+```
+
+`selected-keys.json` is a JSON array of exact Addressables keys. `--key` is also
+repeatable. The output follows
+[sprite-geometries.schema.json](schema/sprite-geometries.schema.json).
+Each `sprites["key[actual Sprite name]"]` entry contains the original `rect`,
+`textureRect`, `textureRectOffset`, pivot, border, pixels per unit, packing flags
+and downscale multiplier. Its source records the actual asset file, decimal
+string path ID and SHA-256/size of every decrypted bundle read. Catalog hashes
+identify the saved input; resource version/hash is included when known.
+
+An APK adds its observed manifest fingerprint and client version. Missing client
+fields remain absent. `--native-fingerprints` additionally hashes native
+libraries from the supplied APK set. These observations do not certify current
+runtime patches or pixel parity. No endpoint or session credentials are exported.
+
+A public bitmap can be a tight integer crop while Unity Image still uses the
+original logical Sprite rectangle. For `ournotes-player/ui`, bind that bitmap
+with `_previewSource` and its original geometry with `_previewSpriteGeometry`.
+The trimmed preview expects `floor(textureRect.min)..ceil(textureRect.max)` and
+supports unrotated, unscaled crops; other bitmap contracts require explicit
+conversion. Full textures already containing the logical Sprite rectangle must
+not be labeled as a trimmed crop.
+
+`--public-bitmaps observed-bitmaps.json` fingerprints a separate observation
+file. A public URL, dimensions or file hash alone does not prove that its pixels
+were generated from the native Sprite. Keep the native metadata and public
+bitmap evidence distinct, and pin/verify both when publishing a UI library.
diff --git a/docs/ui.md b/docs/ui.md
index 57c1686..8e7a5fb 100644
--- a/docs/ui.md
+++ b/docs/ui.md
@@ -1,5 +1,9 @@
 # Serialized UI libraries (experimental)
 
+For external artwork binding, use the separate
+[original Sprite geometry producer](sprite-geometries.md) to preserve the
+logical rectangle and transparent trim offsets without decoding textures.
+
 `nnnotes ui` exports an offline prefab library for the optional `ournotes-player/ui` preview module. It reads the
 embedded Addressables catalog and bundle closure of the APK set you supply; it does not contact a game API. Keep
 outputs outside the nnnotes and ournotes-player source repositories. The export contains game data that these
diff --git a/src/nnnotes/cli.py b/src/nnnotes/cli.py
index 5bc0f2a..89097c3 100644
--- a/src/nnnotes/cli.py
+++ b/src/nnnotes/cli.py
@@ -43,6 +43,7 @@
     nnnotes run-stage <task.json> [...]
     nnnotes catalogs list | import <catalog.bin> | fetch | diff <old> <new>
     nnnotes store verify
+    nnnotes sprite-geometries --keys selected-keys.json -o out/sprite-geometries.json
 """
 from __future__ import annotations
 
@@ -764,6 +765,11 @@ def cmd_ui(args, cfg):
     ui.command(args, cfg)
 
 
+def cmd_sprite_geometries(args, cfg):
+    from . import spritegeometry
+    spritegeometry.command(args, cfg)
+
+
 def build_parser() -> argparse.ArgumentParser:
     p = argparse.ArgumentParser(prog="nnnotes", description="BanG Dream! Our Notes data toolkit")
     p.add_argument("--version", action="version", version=f"nnnotes {__version__}")
@@ -1018,6 +1024,13 @@ def target(m, what):
     c.add_argument("--no-dependencies", action="store_true", help="omit additional prefab roots and controllers")
     c.add_argument("--force", action="store_true", help="re-export the selected keys")
     c.set_defaults(func=cmd_ui, usage=c.error)
+    c = sub.add_parser("sprite-geometries", help="observe original Sprite geometry without decoding textures")
+    c.add_argument("--key", action="append", help="exact catalog key (repeatable)")
+    c.add_argument("--keys", metavar="JSON", help="JSON array of exact catalog key strings")
+    c.add_argument("--native-fingerprints", action="store_true", help="also hash the configured APK's native libraries")
+    c.add_argument("--public-bitmaps", metavar="JSON", help="fingerprint a separately observed public bitmap listing")
+    _out(c, "Sprite metadata JSON outside the source repositories")
+    c.set_defaults(func=cmd_sprite_geometries, usage=c.error)
     return p
 
 
diff --git a/src/nnnotes/spritegeometry.py b/src/nnnotes/spritegeometry.py
new file mode 100644
index 0000000..0707f99
--- /dev/null
+++ b/src/nnnotes/spritegeometry.py
@@ -0,0 +1,118 @@
+"""Original Sprite geometry observations, without decoding or publishing textures.
+
+The output is game data and belongs outside source repositories. It preserves
+the logical Sprite rectangle independently of a published bitmap's trim.
+"""
+from __future__ import annotations
+
+import hashlib
+import json
+from pathlib import Path
+
+from .cache import write_atomic
+from .export import Exporter
+from .jsonio import dumps
+
+SCHEMA = "nnnotes.observed-sprite-geometries/1"
+
+
+def fingerprint(data: bytes) -> dict:
+    return {"sha256": hashlib.sha256(data).hexdigest(), "size": len(data)}
+
+
+def observe(cat, keys, *, region, client=None, native=None, out=None) -> dict:
+    """Read every actual Sprite in the explicitly selected bundle closures.
+
+    Catalog and decrypted bundle hashes identify the inputs actually read.
+    `client`/`native` are observed APK identity, never inferred from a catalog.
+    Public bitmap evidence is deliberately independent of these native records.
+    """
+    keys = list(keys)
+    if not keys or any(not isinstance(key, str) or not key for key in keys):
+        raise ValueError("at least one exact nonempty catalog key is required")
+    keys = sorted(set(keys))
+    unknown = [key for key in keys if not cat.has(key)]
+    if unknown:
+        raise ValueError("Sprite key not in catalog: " + ", ".join(unknown))
+    sources = {name: fingerprint(data) for name, data in cat.sources().items()}
+    document = {"schema": SCHEMA, "region": region, "client": client or {},
+                "catalogSha256": sources["remote"]["sha256"],
+                "source": {"kind": "observed-nnnotes-sprite-metadata", "catalogs": sources,
+                           "native": native or {}, "runtimeVerified": False}, "sprites": {}}
+    source = getattr(cat, "source", None)
+    if source is not None:
+        # Do not serialize endpoint/session settings or authentication state.
+        document["source"]["resource"] = {"provider": source.provider, "version": source.version,
+                                          "hash": source.hash, "platform": source.platform}
+    for key in keys:
+        exporter = Exporter(cat, Path(out or "."), textures="deferred")
+        environment, _ = exporter.load(key)
+        bundles = [{"file": bundle.name, **fingerprint(cat.fetch(bundle).read_bytes())}
+                   for bundle in sorted(cat.resolve(key), key=lambda value: value.name)]
+        found = False
+        for obj in environment.objects:
+            if obj.type.name != "Sprite":
+                continue
+            tree = obj.read_typetree()
+            render, _, _ = exporter.sprite_render_data(obj, tree)
+            name = tree["m_Name"]
+            sprite_key = f"{key}[{name}]"
+            if sprite_key in document["sprites"]:
+                raise ValueError("Ambiguous Sprite name in one closure: " + sprite_key)
+            geometry = {"rect": tree["m_Rect"], "pivot": tree["m_Pivot"], "border": tree["m_Border"],
+                        "pixelsPerUnit": tree["m_PixelsToUnits"], "textureRect": render["textureRect"],
+                        "textureRectOffset": render["textureRectOffset"], "settingsRaw": render["settingsRaw"],
+                        "downscaleMultiplier": render.get("downscaleMultiplier", 1)}
+            document["sprites"][sprite_key] = {"geometry": geometry, "source": {
+                "key": key, "name": name, "assetFile": obj.assets_file.name, "pathId": str(obj.path_id),
+                "catalogSha256": sources["remote"]["sha256"], "bundles": bundles}}
+            found = True
+        if not found:
+            raise ValueError("No actual Sprite in requested key: " + key)
+    return document
+
+
+def apk_identity(apk, *, native_fingerprints=False):
+    from .apkset import ApkSet
+    from .deckdata import apk_client
+    from .player import MANIFEST_IN_APK
+    client = {key: value for key, value in apk_client(apk).items() if value is not None}
+    native = {}
+    with ApkSet(apk) as archive:
+        if MANIFEST_IN_APK in archive.namelist():
+            native["manifest"] = {"file": MANIFEST_IN_APK, **fingerprint(archive.read(MANIFEST_IN_APK))}
+        if native_fingerprints:
+            native["libraries"] = [{"file": name, **fingerprint(archive.read(name))}
+                for name in sorted(archive.namelist())
+                if name.startswith("lib/") and name.rsplit("/", 1)[-1] in ("libil2cpp.so", "libanort.so")]
+    return client, native
+
+
+def command(args, cfg):
+    from .cli import open_catalog
+    from .config import ConfigError
+    keys = list(args.key or [])
+    try:
+        if args.keys:
+            value = json.loads(Path(args.keys).read_text(encoding="utf-8"))
+            if not isinstance(value, list) or any(not isinstance(key, str) or not key for key in value):
+                raise ValueError("--keys must contain a JSON array of exact catalog key strings")
+            keys.extend(value)
+        client, native = ({}, {})
+        apk = cfg.path("paths", "apk")
+        if apk is not None:
+            client, native = apk_identity(apk, native_fingerprints=args.native_fingerprints)
+        elif args.native_fingerprints:
+            raise ValueError("--native-fingerprints requires a configured APK set")
+        document = observe(open_catalog(cfg), keys, region=cfg.region(), client=client, native=native, out=args.out)
+        if args.public_bitmaps:
+            path = Path(args.public_bitmaps)
+            # A separately observed public listing is not native Sprite data.
+            document["source"]["publicBitmaps"] = {"file": path.name, **fingerprint(path.read_bytes())}
+        encoded = dumps(document, indent=1, ensure_ascii=False).encode("utf-8")
+        Path(args.out).parent.mkdir(parents=True, exist_ok=True)
+        write_atomic(Path(args.out), encoded)
+    except (ValueError, OSError, KeyError) as exc:
+        raise ConfigError(str(exc)) from None
+    print(json.dumps({"file": str(Path(args.out).resolve()), "keys": len(set(keys)),
+                      "sprites": len(document["sprites"]), **fingerprint(encoded)}))
diff --git a/tests/test_spritegeometry.py b/tests/test_spritegeometry.py
new file mode 100644
index 0000000..32e1b93
--- /dev/null
+++ b/tests/test_spritegeometry.py
@@ -0,0 +1,102 @@
+"""Synthetic metadata only. The producer never decodes or exports artwork."""
+import hashlib
+import json
+from pathlib import Path
+from types import SimpleNamespace as NS
+
+import jsonschema
+import pytest
+
+from nnnotes import cli, spritegeometry
+
+
+KEY = "Example/Trimmed"
+TREE = {"m_Name": "portrait", "m_Rect": {"x": 9, "y": 7, "width": 120.5, "height": 200.25},
+        "m_Pivot": {"x": .5, "y": .5}, "m_Border": {"x": 0, "y": 0, "z": 0, "w": 0}, "m_PixelsToUnits": 100}
+RENDER = {"textureRect": {"x": 30.25, "y": 40.5, "width": 60.5, "height": 140.25},
+          "textureRectOffset": {"x": 20.75, "y": 10.5}, "settingsRaw": 64}
+
+
+@pytest.fixture
+def observed(tmp_path, monkeypatch):
+    bundle_path = tmp_path / "example.bundle"
+    bundle_path.write_bytes(b"synthetic bundle")
+    sprite = NS(type=NS(name="Sprite"), assets_file=NS(name="synthetic-CAB"),
+                path_id=-(1 << 62) + 13, read_typetree=lambda: TREE)
+    # Accessing texture pixel data is a regression. It must remain unread.
+    def no_texture_read():
+        raise AssertionError("texture decode is forbidden in metadata producer")
+    texture = NS(type=NS(name="Texture2D"), read=no_texture_read, read_typetree=no_texture_read)
+    environment = NS(objects=[sprite, texture])
+    class Exporter:
+        def __init__(self, cat, out, **options):
+            assert options == {"textures": "deferred"}
+        def load(self, key):
+            assert key == KEY
+            return environment, None
+        def sprite_render_data(self, obj, tree):
+            assert obj is sprite and tree is TREE
+            return RENDER, obj, None
+    class Catalog:
+        source = None
+        def has(self, key):
+            return key == KEY
+        def sources(self):
+            return {"remote": b"synthetic catalog"}
+        def resolve(self, key):
+            return [NS(name=bundle_path.name)]
+        def fetch(self, bundle):
+            return bundle_path
+    monkeypatch.setattr(spritegeometry, "Exporter", Exporter)
+    return Catalog(), environment
+
+
+def test_exact_rect_trim_source_and_int64_identity(observed):
+    cat, _ = observed
+    document = spritegeometry.observe(cat, [KEY, KEY], region="example")
+    entry = document["sprites"][KEY + "[portrait]"]
+    assert entry["geometry"]["rect"] == TREE["m_Rect"]
+    assert entry["geometry"]["textureRectOffset"] == RENDER["textureRectOffset"]
+    assert entry["geometry"]["downscaleMultiplier"] == 1
+    assert entry["source"]["pathId"] == str(-(1 << 62) + 13)
+    assert entry["source"]["bundles"][0]["sha256"] == hashlib.sha256(b"synthetic bundle").hexdigest()
+    assert document["client"] == {} and document["source"]["runtimeVerified"] is False
+    schema = json.loads((Path(__file__).parents[1] / "docs/schema/sprite-geometries.schema.json").read_text())
+    jsonschema.validate(document, schema)
+
+
+def test_unknown_or_empty_keys_never_produce_guessed_records(observed):
+    cat, _ = observed
+    for keys in [[], ["Example/Unknown"]]:
+        with pytest.raises(ValueError):
+            spritegeometry.observe(cat, keys, region="example")
+
+
+def test_duplicate_sprite_names_are_an_explicit_error(observed):
+    cat, env = observed
+    env.objects.append(env.objects[0])
+    with pytest.raises(ValueError, match="Ambiguous Sprite"):
+        spritegeometry.observe(cat, [KEY], region="example")
+
+
+def test_cli_keys_file_and_separate_public_bitmap_fingerprint(observed, tmp_path, monkeypatch, capsys):
+    cat, _ = observed
+    monkeypatch.setattr(cli, "open_catalog", lambda cfg: cat)
+    keys = tmp_path / "keys.json"
+    keys.write_text(json.dumps([KEY]))
+    public = tmp_path / "public.json"
+    public.write_bytes(b'{"observed":"synthetic bitmap listing"}')
+    out = tmp_path / "private" / "sprite-geometries.json"
+    cli.main(["--region", "example", "sprite-geometries", "--keys", str(keys), "--public-bitmaps", str(public), "-o", str(out)])
+    document = json.loads(out.read_text())
+    assert document["region"] == "example"
+    assert document["source"]["publicBitmaps"]["sha256"] == hashlib.sha256(public.read_bytes()).hexdigest()
+    assert "publicBitmaps" not in document["sprites"][KEY + "[portrait]"]["source"]
+    assert json.loads(capsys.readouterr().out)["sprites"] == 1
+
+
+def test_native_fingerprint_request_without_apk_is_rejected(tmp_path, capsys):
+    with pytest.raises(SystemExit) as result:
+        cli.main(["sprite-geometries", "--key", KEY, "--native-fingerprints", "-o", str(tmp_path / "x.json")])
+    assert result.value.code == 2
+    assert "requires a configured APK" in capsys.readouterr().err