Include observed per-record timing in the v0.7.0 release draft

CHANGELOG.md

@@ -11,6 +11,19 @@ This release freezes the verified content at `521f4ee62ee3843cf36394499c10bf33f0
 complete drawing sequences and one historical August 20 Rec02. The recordings
 add 68,125,363,425 bytes and 9,830.501363 seconds of encoded playback.
 
+### Per-record timing evidence
+
+- Added the optional Recording Timing v2 table for all 339 prospective recordings
+  across 33 owner-confirmed works. All 339 have retained MP4 format creation
+  timestamps; 316 also have matching retained video-stream tags. Filename-based
+  starts are available for 163 recordings, while 176 starts remain unknown.
+- Published a projection from 13 retained ingest audits, checksum-bound source
+  receipts, field definitions, a validator and regression tests. The validator
+  preserves the frozen cohort when unrelated later index rows are added.
+- Kept creation/finalization observations separate from filename-derived starts
+  and canonical group-finish labels. Observed intervals are not validated capture
+  durations. No model-estimated starts are inserted into this table.
+
 ### Work identity and compatibility
 
 - Added the optional `Work_Identity/` registry with opaque permanent work IDs,
@@ -30,9 +43,11 @@ add 68,125,363,425 bytes and 9,830.501363 seconds of encoded playback.
   the documented correction and verifies the later Rec02 exclusion when
   reconstructing the original pinned snapshot.
 
-Release preparation changes only `README.md`, `CHANGELOG.md`, and `VALIDATION.md`,
-then adds `RELEASE_MANIFEST_V0.7.0.json` bound to their exact preceding commit.
-It adds no media, index, registry, relationship, checksum, or schema changes.
+Release preparation adds the five-file Recording Timing v2 packet and its
+validator/tests, updates `README.md`, `CHANGELOG.md`, and `VALIDATION.md`, and
+binds them in `RELEASE_MANIFEST_V0.7.0.json`. It preserves all media, canonical
+indexes, work assignments, dated relationship packets and checksum entries.
+The final manifest is added alone after all other release bytes are fixed.
 The detailed entries below retain the scope and evidence of each earlier change.
 
 ### August 20 Rec02 historical backfill

README.md

@@ -459,6 +459,12 @@ not be flattened into the main 29-field table:
   identify 339 canonical fragments. They preserve grouping, order, completeness,
   and any noncanonical derivative relationship without adding derivative media
   to the active index.
+- [Recording Timing v2](Standard_Time_Lapses/Provenance/Recording_Timing_v2/README.md)
+  publishes observed MP4 creation timestamps for all 339 prospective recordings
+  across 33 confirmed works. Original device filenames support 163 local start
+  observations; 176 starts remain unknown. Creation/finalization timestamps and
+  filename-to-creation intervals do not establish exact capture duration or
+  active drawing time. This separate table preserves the canonical CSV schema.
 - [Recording Timing v1](Standard_Time_Lapses/Provenance/Recording_Timing/README.md)
   is an exploratory, revision-pinned layer for 186 fragments in six earlier
   dated manifests. It separates 22 direct filename-to-MP4-boundary observations

RELEASE_MANIFEST_V0.7.0.json

@@ -1,839 +0,0 @@
-{
-  "manifest_schema": "time-lapse-artifacts-release-manifest/v1",
-  "release_version": "v0.7.0",
-  "release_status": "final",
-  "release_tag": "v0.7.0",
-  "dataset_id": "maxwellinked/time-lapse-artifacts",
-  "created_date": "2026-09-19",
-  "validated_content_revision": "521f4ee62ee3843cf36394499c10bf33f07dcaae",
-  "critical_files_revision": "79a11f6029ed9f23a09542499120e7eb779bd5c6",
-  "prior_release": {
-    "tag": "v0.6.0",
-    "commit": "4fa4c34ed87ecc35747668abcdd58c91650349d0",
-    "annotated_tag_object": "b202e3e2e115cc2d7e5e15d345c73b2344e087c3"
-  },
-  "revision_roles": {
-    "validated_content_revision": "Verified main content after Rec02 ingest and confirmed work assignments.",
-    "critical_files_revision": "Commit A: final release-documentation bytes immediately before this manifest is added.",
-    "final_tag": "The tag must resolve to a tree differing from critical_files_revision only by addition of RELEASE_MANIFEST_V0.7.0.json."
-  },
-  "release_delta_from_prior_release": {
-    "active_rows_added": 74,
-    "active_rows_removed": 0,
-    "canonical_standard_rows_added": 74,
-    "active_video_bytes_added": 68125363425,
-    "encoded_playback_seconds_added": "9830.501363",
-    "existing_active_index_rows_modified": 24,
-    "finish_time_correction_rows": 12,
-    "repository_provenance_backfill_rows": 12,
-    "existing_record_ids_preserved": true,
-    "existing_media_bytes_preserved": true,
-    "existing_media_paths_renamed": 12,
-    "identity_preserving_renames": [
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-        "new_path": "Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec01.mp4",
-        "sha256": "d8e6df65eda81e16240d883ab6eb6f731a3d9b7fd6546959efdd6b1b43818393"
-      },
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-        "new_path": "Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec02.mp4",
-        "sha256": "26a535d47e54b828826023083374acfee2abd862da864b8c0ce4309cfaa84443"
-      },
-      {
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-        "old_path": "Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec03.mp4",
-        "new_path": "Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec03.mp4",
-        "sha256": "5b9a86a764216cbdd115b620d45a1d356b5797154df4021916bbccedbe8dbdad"
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-        "new_path": "Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec04.mp4",
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-        "new_path": "Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec05.mp4",
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-        "new_path": "Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec06.mp4",
-        "sha256": "8a011dacab8a873b1091ad3b06bf4114c29d8c8a6180070c17e3a79fa4cb6042"
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-        "new_path": "Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec07.mp4",
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-        "new_path": "Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec08.mp4",
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-        "old_path": "Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec09.mp4",
-        "new_path": "Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec09.mp4",
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+      "retention": "original audit retained locally; timing fields projected in observations.json",
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+      "included_rows": 39
+    },
+    {
+      "source_audit_id": "ingest_20260831",
+      "size_bytes": 46851,
+      "sha256": "91f15a43af2346a302b66dde18fa96f8583c61b6de6dfb1389bb4ed01a92a6c8",
+      "retention": "original audit retained locally; timing fields projected in observations.json",
+      "total_rows": 32,
+      "included_rows": 32
+    },
+    {
+      "source_audit_id": "ingest_20260901",
+      "size_bytes": 19217,
+      "sha256": "8df0d8eb9a329e9d60dab9db9c2e375df1bb99343f8f26eed214f3ba1f48137b",
+      "retention": "original audit retained locally; timing fields projected in observations.json",
+      "total_rows": 13,
+      "included_rows": 13
+    },
+    {
+      "source_audit_id": "ingest_20260902",
+      "size_bytes": 46844,
+      "sha256": "4a94d412299388bc88cafd5c0a33b3383be04e30d0b03ead997370945df47c1c",
+      "retention": "original audit retained locally; timing fields projected in observations.json",
+      "total_rows": 32,
+      "included_rows": 32
+    },
+    {
+      "source_audit_id": "ingest_20260902_evening",
+      "size_bytes": 42498,
+      "sha256": "f6fe34c60f8e2295c1cd9fa7a489aa82bb9b314009276e9b2ff10b7688631043",
+      "retention": "original audit retained locally; timing fields projected in observations.json",
+      "total_rows": 29,
+      "included_rows": 29
+    },
+    {
+      "source_audit_id": "ingest_20260914",
+      "size_bytes": 58154,
+      "sha256": "c19704937d6ae1dcf5dbdc6d4af8905742b7ec915dc62958af77afef66c365d3",
+      "retention": "original audit retained locally; timing fields projected in observations.json",
+      "total_rows": 32,
+      "included_rows": 32
+    },
+    {
+      "source_audit_id": "ingest_20260915",
+      "size_bytes": 41128,
+      "sha256": "948797b20449b9c9ff100b3d220aa59a1590916e4bba20f32baeed95d6a69d45",
+      "retention": "original audit retained locally; timing fields projected in observations.json",
+      "total_rows": 23,
+      "included_rows": 23
+    },
+    {
+      "source_audit_id": "ingest_20260916",
+      "size_bytes": 38868,
+      "sha256": "3732b1e55ffd7ae0475583d0fb20a207e38f54d149f8301e9c03882a5ad156ee",
+      "retention": "original audit retained locally; timing fields projected in observations.json",
+      "total_rows": 25,
+      "included_rows": 25
+    },
+    {
+      "source_audit_id": "ingest_20260916_2043",
+      "size_bytes": 32933,
+      "sha256": "a0f696ed3db24af616af91b1e0b5158ee1310feaca2057dad8918b43e9e9fe2b",
+      "retention": "original audit retained locally; timing fields projected in observations.json",
+      "total_rows": 21,
+      "included_rows": 21
+    },
+    {
+      "source_audit_id": "ingest_20260917_1140",
+      "size_bytes": 37710,
+      "sha256": "d7a45836fd82f65abeec857a8ecfa1af22e846907bbd2e9a49f93c228a90c52a",
+      "retention": "original audit retained locally; timing fields projected in observations.json",
+      "total_rows": 23,
+      "included_rows": 23
+    },
+    {
+      "source_audit_id": "ingest_20260918",
+      "size_bytes": 42415,
+      "sha256": "c0fe98dce0e406ba21afedda7475f25a806445deeebd06b4e61bf49e35de4e58",
+      "retention": "original audit retained locally; timing fields projected in observations.json",
+      "total_rows": 29,
+      "included_rows": 29
+    }
+  ],
+  "source_files": [
+    {
+      "path": "metadata.csv",
+      "size_bytes": 569597,
+      "sha256": "5f2554c6ec20a137031bdfc180953530bcaef8d0baad35c7c222a42670b6ec6d"
+    },
+    {
+      "path": "SHA256SUMS",
+      "size_bytes": 121519,
+      "sha256": "c7eb7912698788eca2d64550f935e432106af2fb79c89fb778e946ccd46b06ff"
+    },
+    {
+      "path": "Work_Identity/works.csv",
+      "size_bytes": 18342,
+      "sha256": "a6b65ff2c0045d9e17861f9a7d06c86856a951a39e8edca7a67a4df1aeab311f"
+    },
+    {
+      "path": "Work_Identity/work_record_links.csv",
+      "size_bytes": 107157,
+      "sha256": "6fe0dace5366fda655e07c15a6370dcfb324f96a81eaebf973ad1282be559ded"
+    },
+    {
+      "path": "Standard_Time_Lapses/Provenance/2026-08-27/fragment_sequence_relationships.csv",
+      "size_bytes": 15322,
+      "sha256": "62b1fd9add3be03e3e7198df8f107a416741682c79878b7622c6ea1c34ec4ce8"
+    },
+    {
+      "path": "Standard_Time_Lapses/Provenance/2026-08-29/fragment_sequence_relationships.csv",
+      "size_bytes": 12748,
+      "sha256": "9648cf53ce35dd30b6c0c8c3c223c4ed68aea9a03d2e7f4843ad6f39e04c7bb7"
+    },
+    {
+      "path": "Standard_Time_Lapses/Provenance/2026-08-30/fragment_sequence_relationships.csv",
+      "size_bytes": 26023,
+      "sha256": "427b416c617c9bf9400ec574452902180fec94c8a0dbe8fc1526ece7a1bdb50c"
+    },
+    {
+      "path": "Standard_Time_Lapses/Provenance/2026-08-31/fragment_sequence_relationships.csv",
+      "size_bytes": 21413,
+      "sha256": "e006ba8b30f31b14f750992455c74459a88d50d40e9b4fe57623c5a8dd332272"
+    },
+    {
+      "path": "Standard_Time_Lapses/Provenance/2026-09-01/fragment_sequence_relationships.csv",
+      "size_bytes": 8821,
+      "sha256": "200d7f4e38d06caf7a472dbaec2b7bae62a3dd1b4fce808b638391b2060a957a"
+    },
+    {
+      "path": "Standard_Time_Lapses/Provenance/2026-09-02/fragment_sequence_relationships.csv",
+      "size_bytes": 40663,
+      "sha256": "066ababd2a40c2be23087588603dc680adadd54e7cbb6708ab238c22e216932e"
+    },
+    {
+      "path": "Standard_Time_Lapses/Provenance/2026-09-14/fragment_sequence_relationships.csv",
+      "size_bytes": 25195,
+      "sha256": "bbe3760b731134be34caaf70df463632578be1772ddbedf648889e0820f26195"
+    },
+    {
+      "path": "Standard_Time_Lapses/Provenance/2026-09-15/fragment_sequence_relationships.csv",
+      "size_bytes": 17572,
+      "sha256": "5c7d6a32ba3a9b2c3e6ab4da660da3e73601b0aa8a11067d75084a82c698c1ad"
+    },
+    {
+      "path": "Standard_Time_Lapses/Provenance/2026-09-16.2043/fragment_sequence_relationships.csv",
+      "size_bytes": 16585,
+      "sha256": "a0c8746421029d4ae53e03e9b58c32bfb37b61835b76239e95014629cf1e1d2e"
+    },
+    {
+      "path": "Standard_Time_Lapses/Provenance/2026-09-16/fragment_sequence_relationships.csv",
+      "size_bytes": 19653,
+      "sha256": "b54589508dea32461d793ab21e2f69d8b3fc2b708469e313b03f24017a46aa66"
+    },
+    {
+      "path": "Standard_Time_Lapses/Provenance/2026-09-17/fragment_sequence_relationships.csv",
+      "size_bytes": 18101,
+      "sha256": "018cbd288f151d5a770d96c1897bce9da6d0aff5afd1df10f1eb8c0c047aff4f"
+    },
+    {
+      "path": "Standard_Time_Lapses/Provenance/2026-09-18/fragment_sequence_relationships.csv",
+      "size_bytes": 19011,
+      "sha256": "927eac99a06556281824b1925f124e744f5b33684711b6d3a8851658a54504b7"
+    }
+  ],
+  "packet_files": [
+    {
+      "path": "README.md",
+      "size_bytes": 4396,
+      "sha256": "fc44f140c5c46f1980f72727a4413e687f7a6933a079dc8b899ea2bac7bc69d9"
+    },
+    {
+      "path": "SCHEMA.md",
+      "size_bytes": 3678,
+      "sha256": "0a62a408336573df2ce7011541ba68f3bfdd09317bdc53788713adf1b38db0b2"
+    },
+    {
+      "path": "observations.json",
+      "size_bytes": 147061,
+      "sha256": "aa2740a72b5068655e4d99e5c05c244a915ec22235293c970774d4fa936991d3"
+    },
+    {
+      "path": "recording_timing.csv",
+      "size_bytes": 207623,
+      "sha256": "c7258515aa3bc32e9336df7a17e0f4dd50e4060bc83acb54daaa803cc821f1d4"
+    }
+  ]
+}

Standard_Time_Lapses/Provenance/Recording_Timing_v2/README.md

@@ -0,0 +1,79 @@
+# Recording Timing v2: observed timestamps
+
+This optional sidecar brings the retained per-record timing evidence into the
+repository for **339 prospective Standard recordings across 33 confirmed works**.
+It is a frozen snapshot of the cohort at `521f4ee62ee3843cf36394499c10bf33f07dcaae`.
+The canonical 29-field metadata schema and the historical
+[Recording Timing v1](../Recording_Timing/README.md) packet are unchanged.
+
+Use [recording_timing.csv](recording_timing.csv), joined by `record_id`.
+Its `work_id` comes from the owner-confirmed registry; it does not create work
+assignments. Current paths include the documented September 1 `14:13` correction.
+The original v1 packet retains its historical paths, estimates and conflict.
+
+| Observation | Coverage |
+| --- | ---: |
+| Literal MP4 format creation timestamp | 339 |
+| Literal video-stream creation timestamp | 316 |
+| Format/video timestamps agree, where both were retained | 316 |
+| Start interpreted from an original `VID_YYYYMMDD_HHMMSS.mp4` filename | 163 |
+| Start unknown | 176 |
+
+The 23 September 17 audits retained a format creation tag without a separate
+video-stream creation tag. Those video-stream fields stay blank. No observed
+format/video disagreement or negative filename-to-creation interval occurs in
+this snapshot; that is not proof that the device clock was accurate.
+
+## What the times mean
+
+The `VID_...` filename supplies a local clock observation interpreted as a
+recording start in `America/New_York`. The CSV includes the explicit UTC offset
+and its UTC conversion. This is filename evidence, not an independently calibrated
+capture clock. Other source filenames do not establish a start.
+
+The embedded MP4 `creation_time` is a literal creation/finalization observation.
+It is **not a guaranteed recording-stop timestamp**. Where a filename start
+exists, `filename_to_creation_seconds` subtracts that start from the format tag.
+It is an observed clock interval, not a validated capture duration or drawing time.
+Missing starts and intervals remain blank. No start estimates are carried forward
+from v1, and neither encoded frame rate nor `com.android.capture.fps` is used
+to reconstruct elapsed time.
+
+Creator-supplied canonical date/time labels describe drawing/group completion;
+they remain in `metadata.csv` and are not substituted for per-record start/end
+times. This packet does not establish continuous capture, time spent actively
+drawing, or pen contact. Complete group membership does not imply gapless capture.
+Historical recordings outside the prospective cohort, including August 20 Rec02,
+are outside this packet's scope. Packet PTS/DTS are not wall-clock timestamps.
+
+## Evidence and reproduction
+
+[observations.json](observations.json) publishes the selected raw fields, source
+filenames and media SHA-256/size bindings. [MANIFEST.json](MANIFEST.json) binds
+that projection, this table and documentation, all pinned repository join inputs,
+and the exact SHA-256/size receipts of the 13 retained local ingest audits.
+The seven older audit receipts match v1's historical source manifest. The original
+local audit files are not bundled; the published projection is an evidence export,
+not a fresh probe of every remote video. Local absolute paths are omitted.
+
+Each observation was matched by permanent record ID, ordinary SHA-256 and size
+to canonical metadata, published checksum and relationship records; Xet identities
+were checked against the revision-bound remote inventory. Twelve corrected paths
+are joined through unchanged record IDs and fixity, without rewriting history.
+
+Run from a checkout containing this packet:
+
+```sh
+python tools/validate_recording_timing_v2.py --root .
+```
+
+The default checks the frozen cohort against current identity joins and reports
+how many complete source-file receipts still match; unrelated later ingests do not
+expand this packet. To require every exact historical input byte, additionally
+provide `--source-root` pointing to a checkout of `521f4ee62ee3843cf36394499c10bf33f07dcaae`.
+The validator recomputes all table fields from the published observations and
+checks frozen cohort and group membership. It does not re-read private audits,
+download the videos, or repeat their original decode checks.
+
+Field definitions are in [SCHEMA.md](SCHEMA.md). Release fixity also binds the
+validator and the rest of the repository through the release manifest.

Standard_Time_Lapses/Provenance/Recording_Timing_v2/SCHEMA.md

@@ -0,0 +1,39 @@
+# Recording Timing v2 schema
+
+UTF-8 CSV with one row per prospective canonical recording. Empty strings mean
+unknown or not observed, never zero. Rows are sorted by current canonical path.
+The packet is frozen at the source revision declared in `MANIFEST.json`.
+
+| Fields | Definition |
+| --- | --- |
+| `record_id`, `work_id` | Existing permanent recording identity and owner-confirmed work membership at the pinned revision. |
+| `file_path`, `source_hub_revision` | Canonical media path and the exact repository snapshot used for current metadata, registry and checksum joins. |
+| `relationship_path`, `relationship_source_revision` | Published fragment sidecar and its declared source revision. Historical sidecar paths may precede documented identity-preserving corrections. |
+| `sequence_position`, `sequence_count` | One-based position and group size copied from the relationship sidecar; every work in this packet has the complete 1..N membership. |
+| `sha256`, `size_bytes`, `hub_xet_hash` | Ordinary source SHA-256, byte length and separately identified Xet hash. These are not interchangeable hash algorithms. |
+| `source_audit_id`, `source_filename` | Logical retained-audit identifier and original local basename, without its absolute path. |
+| `filename_start_local` | Strict `VID_YYYYMMDD_HHMMSS.mp4` date/time interpreted in the manifest's IANA timezone; ISO 8601 with explicit offset. Nonmatching names leave this empty. Ambiguous or nonexistent local clock times are rejected. |
+| `filename_start_utc` | UTC conversion of the filename observation. |
+| `filename_start_basis` | `device_filename_interpreted_in_declared_timezone` or `unknown`. No inferred or modeled start is substituted. |
+| `format_creation_time_utc` | Normalized literal MP4 format `creation_time`. Required in this frozen packet; creation/finalization observation, not guaranteed capture stop. |
+| `video_creation_time_utc` | Normalized literal video-stream creation tag, when retained. A missing tag remains empty. |
+| `creation_tag_agreement` | `match`, `mismatch`, or `not_observed` when no video-stream tag was retained. |
+| `filename_to_creation_seconds` | Exact decimal difference: format creation UTC minus filename-start UTC. Empty when the start is unknown. This is an observed clock interval, not a validated capture duration. Negative differences remain negative. |
+| `timing_status` | `filename_start_and_creation_observed`, `creation_only`, or `clock_conflict` for tag mismatch or a negative interval. |
+
+The `observations.json` projection preserves raw timestamp strings alongside
+`record_id`, `source_audit_id`, `source_filename`, `source_sha256` and
+`source_size_bytes`. Different audit formats used nested `format_tags`/`video_tags`
+or named timestamp fields; only the literal retained values are projected.
+The format field also appeared as `embedded_creation_time_utc` in the September 18
+audit. That audit's video field was `video_stream_creation_time_utc`.
+
+`MANIFEST.json` contains the frozen record IDs, snapshot revision, filename timezone, coverage counts,
+retained-audit receipts, source-file receipts and packet-file receipts. It does
+not hash itself; the enclosing release manifest binds it. Public validation proves
+consistency with the exported observations and recording-level repository joins.
+An explicit `--source-root` also requires all original source-file receipts;
+default validation reports those matches separately and permits unrelated later
+index additions without changing the frozen cohort. Verifying
+the projection against the private original audits requires those retained files.
+The builder verified all 13 originals when producing this packet.

VALIDATION.md

@@ -21,10 +21,13 @@ commit-history provenance backfills. Pre-Standard metadata is byte-identical.
 | Revision-pinned work-record joins | 360 verified across 10 source revisions |
 | Work-identity evidence | 23 checksum-pinned confirmation files and 27 revision-pinned evidence files |
 | Recording Timing v1 | 186 fragments / 25 groups; historical packet unchanged |
+| Recording Timing v2 | 339 observations / 33 works; 163 filename starts / 176 unknown starts |
+| Timing v2 creation tags | 339 format tags; 316 retained video tags, all matching |
+| Timing v2 evidence | 13 exact local audit receipts; 16 pinned repository input files; all media identities matched |
 | Physical-reference relationships | 309; checked against their declared source revision |
 | Published payloads / SHA256SUMS coverage | 836 MP4 + 1 ZIP / 837 of 837 |
 | Payload inventory bytes | 2,193,547,379,973 |
-| Repository tests | 74 of 74 passed |
+| Repository tests | 86 of 86 passed, including 12 new timing-observation tests |
 | Prior v0.6.0 critical-file receipts | 71 of 71 matched its immutable snapshot |
 
 Ordinary SHA-256 and byte-size bindings were checked against the remote LFS
@@ -35,16 +38,28 @@ Dataset Viewer row and aggregate checks are recorded separately at the exact
 validated content revision in the release manifest. The Viewer is a derived
 current-main cache, not an immutable-tag fixity service.
 
-Commit A changes only these three release documents. Commit B adds only
-`RELEASE_MANIFEST_V0.7.0.json`, which lists all **123** non-MP4/non-ZIP files at
-Commit A with exact byte sizes and SHA-256 values. Its own bytes are excluded
-from that preceding revision, avoiding a self-referential checksum. The final
-release tree must contain **961** paths and differ from Commit A only by that
-manifest. Post-merge/tag receipts must bind the actual published revisions.
+The release draft adds Recording Timing v2 as five packet files and two tool/test
+files, alongside the three updated release documents. The revised manifest lists
+all **130** non-MP4/non-ZIP files at the final content/documentation commit with
+exact byte sizes and SHA-256 values. That commit excludes the draft's earlier
+manifest; the regenerated `RELEASE_MANIFEST_V0.7.0.json` is then added alone.
+The final release tree must contain **968** paths and differ from the declared
+critical-files revision only by the manifest. Post-merge/tag receipts must bind
+the actual published revisions.
+
+The timing table is derived from the literal retained audit fields. Every one of
+the 339 observations joins by existing record ID, ordinary SHA-256 and size;
+canonical metadata, sidecars, checksum entries and revision-bound remote Xet
+identities agree. All seven older audit hashes still match the v1 source manifest.
+Twelve September 1 path corrections resolve through stable IDs and fixity.
+The strict timing validation checks all 16 original input-file receipts and
+recomputes the table. Default future validation keeps this cohort frozen and
+reports input-file receipts separately, permitting unrelated later index additions.
+No video is re-read for this projection and no exact capture-stop claim is made.
 
 The release preparation preserves every media object, active index, checksum
-entry, work assignment, confirmation, historical sidecar, schema, previous
-release manifest, and existing tag. The DOI `10.57967/hf/10449` remains attached
+entry, work assignment, confirmation, historical sidecar, canonical schema,
+previous release manifest, and existing tag. The DOI `10.57967/hf/10449` remains attached
 to the historical 709-record v0.5.1 snapshot. Website publication is separate.
 
 ## August 20 Rec02 ingest, reviewed September 19

tools/test_recording_timing_v2.py

@@ -0,0 +1,95 @@
+import copy
+import json
+import shutil
+import tempfile
+import unittest
+from pathlib import Path
+
+from validate_recording_timing_v2 import PREFIX, build_rows, filename_start, timing_values, validate
+
+ROOT = Path(__file__).resolve().parents[1]
+
+
+class TimingObservationTests(unittest.TestCase):
+    def observation(self, name='VID_20260917_211605.mp4', fmt='2026-09-18T01:23:18.000000Z', video=''):
+        return dict(source_filename=name, format_creation_time_raw=fmt, video_creation_time_raw=video)
+
+    def test_start_uses_explicit_timezone(self):
+        row = timing_values(self.observation())
+        self.assertEqual(row['filename_start_local'], '2026-09-17T21:16:05-04:00')
+        self.assertEqual(row['filename_start_utc'], '2026-09-18T01:16:05Z')
+        self.assertEqual(row['filename_to_creation_seconds'], '433')
+
+    def test_shared_finish_name_is_not_a_start(self):
+        row = timing_values(self.observation('2026-09-18.0244.BallpointPen.Ink.Paper.9x12.Rec01.mp4'))
+        self.assertEqual(row['filename_start_utc'], '')
+        self.assertEqual(row['filename_to_creation_seconds'], '')
+        self.assertEqual(row['timing_status'], 'creation_only')
+
+    def test_missing_video_tag_is_not_inferred(self):
+        row = timing_values(self.observation())
+        self.assertEqual(row['video_creation_time_utc'], '')
+        self.assertEqual(row['creation_tag_agreement'], 'not_observed')
+
+    def test_tag_conflict_is_retained(self):
+        row = timing_values(self.observation(video='2026-09-18T01:23:19Z'))
+        self.assertEqual(row['creation_tag_agreement'], 'mismatch')
+        self.assertEqual(row['timing_status'], 'clock_conflict')
+
+    def test_negative_interval_is_not_clamped(self):
+        row = timing_values(self.observation(fmt='2026-09-18T01:16:04Z'))
+        self.assertEqual(row['filename_to_creation_seconds'], '-1')
+        self.assertEqual(row['timing_status'], 'clock_conflict')
+
+    def test_naive_embedded_time_is_rejected(self):
+        with self.assertRaisesRegex(ValueError, 'timezone'):
+            timing_values(self.observation(fmt='2026-09-18T01:23:18'))
+
+    def test_dst_ambiguous_and_missing_times_are_rejected(self):
+        for name in ['VID_20261101_013000.mp4', 'VID_20260308_023000.mp4']:
+            with self.subTest(name=name), self.assertRaises(ValueError):
+                filename_start(name, 'America/New_York')
+
+    def test_private_source_path_is_rejected(self):
+        with self.assertRaisesRegex(ValueError, 'basename'):
+            filename_start('C:\\private\\VID_20260917_211605.mp4', 'America/New_York')
+
+    def test_published_packet(self):
+        result = validate(ROOT)
+        self.assertEqual(result['counts']['recordings'], 339)
+        self.assertEqual(result['counts']['unknown_starts'], 176)
+
+    def test_identity_mismatch_is_rejected(self):
+        packet = json.loads((ROOT / PREFIX / 'observations.json').read_text(encoding='utf-8'))
+        obs = copy.deepcopy(packet['observations'])
+        obs[0]['source_sha256'] = '0' * 64
+        with self.assertRaisesRegex(ValueError, 'SHA-256'):
+            build_rows(obs, ROOT, 'unused')
+
+    def test_missing_observation_is_rejected(self):
+        packet = json.loads((ROOT / PREFIX / 'observations.json').read_text(encoding='utf-8'))
+        with self.assertRaisesRegex(ValueError, 'coverage'):
+            build_rows(packet['observations'][:-1], ROOT, 'unused')
+
+    def test_later_unrelated_append_does_not_expand_frozen_scope(self):
+        with tempfile.TemporaryDirectory() as temp:
+            target = Path(temp)
+            shutil.copytree(ROOT / PREFIX, target / PREFIX)
+            manifest = json.loads((target / PREFIX / 'MANIFEST.json').read_text(encoding='utf-8'))
+            for receipt in manifest['source_files']:
+                p = target / receipt['path']
+                p.parent.mkdir(parents=True, exist_ok=True)
+                shutil.copyfile(ROOT / receipt['path'], p)
+            metadata = target / 'metadata.csv'
+            text = metadata.read_text(encoding='utf-8')
+            first = text.splitlines()[1].replace('tla-3f49a8917fe22676', 'tla-0000000000000000')
+            metadata.write_text(text + first + '\n', encoding='utf-8')
+            result = validate(target)
+            self.assertEqual(result['counts']['recordings'], 339)
+            self.assertEqual(result['matching_source_file_receipts'], 15)
+            with self.assertRaisesRegex(ValueError, 'Size mismatch|Checksum mismatch'):
+                validate(target, target)
+
+
+if __name__ == '__main__':
+    unittest.main()

tools/validate_recording_timing_v2.py

@@ -0,0 +1,225 @@
+#!/usr/bin/env python3
+"""Validate the frozen observation-only timing packet against its pinned inputs."""
+import argparse
+import csv
+import hashlib
+import io
+import json
+import re
+from collections import Counter
+from datetime import datetime, timezone
+from decimal import Decimal
+from pathlib import Path
+from zoneinfo import ZoneInfo
+
+PREFIX = 'Standard_Time_Lapses/Provenance/Recording_Timing_v2'
+FIELDS = [
+    'record_id', 'work_id', 'file_path', 'source_hub_revision',
+    'relationship_path', 'relationship_source_revision', 'sequence_position',
+    'sequence_count', 'sha256', 'size_bytes', 'hub_xet_hash', 'source_audit_id',
+    'source_filename', 'filename_start_local', 'filename_start_utc',
+    'filename_start_basis', 'format_creation_time_utc', 'video_creation_time_utc',
+    'creation_tag_agreement', 'filename_to_creation_seconds', 'timing_status',
+]
+UTC = timezone.utc
+
+
+def require(condition, message):
+    if not condition:
+        raise ValueError(message)
+
+
+def csv_rows(path):
+    return list(csv.DictReader(Path(path).read_text(encoding='utf-8-sig').splitlines()))
+
+
+def iso(value):
+    return value.isoformat().replace('+00:00', 'Z')
+
+
+def utc_tag(raw):
+    if not raw:
+        return None
+    result = datetime.fromisoformat(raw)
+    require(result.tzinfo is not None, 'Embedded timestamp lacks a timezone')
+    require(result.utcoffset().total_seconds() == 0, 'Expected literal UTC creation tag')
+    return result.astimezone(UTC)
+
+
+def filename_start(name, zone_name):
+    require(not any(c in name for c in '/\\:'), 'Source filename must be a basename')
+    match = re.fullmatch(r'VID_(\d{8})_(\d{6})\.mp4', name)
+    if not match:
+        return None
+    naive = datetime.strptime(''.join(match.groups()), '%Y%m%d%H%M%S')
+    zone = ZoneInfo(zone_name)
+    early, late = naive.replace(tzinfo=zone, fold=0), naive.replace(tzinfo=zone, fold=1)
+    require(early.utcoffset() == late.utcoffset(), 'Ambiguous or nonexistent local filename time')
+    require(early.astimezone(UTC).astimezone(zone).replace(tzinfo=None) == naive,
+            'Nonexistent local filename time')
+    return early
+
+
+def seconds(delta):
+    value = Decimal(delta.days * 86400 + delta.seconds) + Decimal(delta.microseconds) / 1000000
+    return format(value, 'f')
+
+
+def timing_values(observation, zone_name='America/New_York'):
+    start = filename_start(observation['source_filename'], zone_name)
+    boundary = utc_tag(observation['format_creation_time_raw'])
+    video = utc_tag(observation['video_creation_time_raw'])
+    require(boundary is not None, 'Format creation tag is required for this packet')
+    interval = seconds(boundary - start.astimezone(UTC)) if start else ''
+    agreement = 'not_observed' if video is None else ('match' if video == boundary else 'mismatch')
+    conflict = agreement == 'mismatch' or (interval != '' and Decimal(interval) < 0)
+    return dict(
+        filename_start_local=start.isoformat() if start else '',
+        filename_start_utc=iso(start.astimezone(UTC)) if start else '',
+        filename_start_basis='device_filename_interpreted_in_declared_timezone' if start else 'unknown',
+        format_creation_time_utc=iso(boundary),
+        video_creation_time_utc=iso(video) if video else '',
+        creation_tag_agreement=agreement,
+        filename_to_creation_seconds=interval,
+        timing_status='clock_conflict' if conflict else ('filename_start_and_creation_observed' if start else 'creation_only'),
+    )
+
+
+def build_rows(observations, source_root, revision, zone_name='America/New_York', expected_ids=None):
+    source_root = Path(source_root)
+    metadata_rows = csv_rows(source_root / 'metadata.csv')
+    metadata = {r['record_id']: r for r in metadata_rows}
+    require(len(metadata) == len(metadata_rows), 'Duplicate metadata record IDs')
+    links = {}
+    for r in csv_rows(source_root / 'Work_Identity/work_record_links.csv'):
+        require(r['record_id'] not in links, 'Duplicate work membership')
+        require(r['owner_confirmation_state'] == 'owner_confirmed', 'Unconfirmed work membership')
+        links[r['record_id']] = r
+    works = {r['work_id'] for r in csv_rows(source_root / 'Work_Identity/works.csv')}
+    relationships = {}
+    for p in sorted((source_root / 'Standard_Time_Lapses/Provenance').glob('*/fragment_sequence_relationships.csv')):
+        for r in csv_rows(p):
+            if r['object_role'] != 'canonical_fragment':
+                continue
+            require(r['record_id'] not in relationships, 'Duplicate fragment relationship')
+            relationships[r['record_id']] = (p.relative_to(source_root).as_posix(), r)
+    checksums = {}
+    for line in (source_root / 'SHA256SUMS').read_text(encoding='utf-8').splitlines():
+        digest, name = line.split(maxsplit=1)
+        checksums[name.lstrip('*')] = digest
+    result = []
+    seen = set()
+    for o in observations:
+        rid = o['record_id']
+        require(rid not in seen, 'Duplicate observation ID')
+        seen.add(rid)
+        m, link = metadata[rid], links[rid]
+        path, s = relationships[rid]
+        require(m['acquisition_protocol_version'] == 'standard-2026-08-27', 'Outside prospective cohort')
+        require(link['work_id'] in works, 'Unknown work ID')
+        require(o['source_sha256'] == s['sha256'] == checksums[m['file_name']], 'SHA-256 identity mismatch')
+        require(int(o['source_size_bytes']) == int(m['size_bytes']) == int(s['size_bytes']), 'Byte-size identity mismatch')
+        require(m['hub_xet_hash'] == s['hub_xet_hash'], 'Xet identity mismatch')
+        require(s['sequence_completeness'] == 'owner_confirmed_complete', 'Unexpected sequence status')
+        row = dict(record_id=rid, work_id=link['work_id'], file_path=m['file_name'],
+                   source_hub_revision=revision, relationship_path=path,
+                   relationship_source_revision=s['source_hub_revision'],
+                   sequence_position=s['sequence_position'], sequence_count=s['sequence_count'],
+                   sha256=o['source_sha256'], size_bytes=str(o['source_size_bytes']),
+                   hub_xet_hash=m['hub_xet_hash'], source_audit_id=o['source_audit_id'],
+                   source_filename=o['source_filename'])
+        row.update(timing_values(o, zone_name))
+        result.append(row)
+    expected = set(expected_ids) if expected_ids is not None else {r['record_id'] for r in metadata_rows if r['acquisition_protocol_version'] == 'standard-2026-08-27'}
+    require(seen == expected, 'Prospective cohort coverage mismatch')
+    groups = {}
+    for row in result:
+        groups.setdefault(row['work_id'], []).append(row)
+    for group in groups.values():
+        require({int(r['sequence_count']) for r in group} == {len(group)}, 'Group count mismatch')
+        require(sorted(int(r['sequence_position']) for r in group) == list(range(1, len(group) + 1)),
+                'Group sequence is incomplete or duplicated')
+    return sorted(result, key=lambda r: r['file_path'])
+
+
+def encode_rows(rows):
+    out = io.StringIO(newline='')
+    writer = csv.DictWriter(out, fieldnames=FIELDS, lineterminator='\n')
+    writer.writeheader()
+    writer.writerows(rows)
+    return out.getvalue().encode('utf-8')
+
+
+def summary(rows):
+    return dict(recordings=len(rows), work_ids=len({r['work_id'] for r in rows}),
+                filename_starts=sum(bool(r['filename_start_utc']) for r in rows),
+                unknown_starts=sum(not r['filename_start_utc'] for r in rows),
+                format_creation_tags=sum(bool(r['format_creation_time_utc']) for r in rows),
+                video_creation_tags=sum(bool(r['video_creation_time_utc']) for r in rows),
+                creation_tag_matches=sum(r['creation_tag_agreement'] == 'match' for r in rows),
+                creation_tag_mismatches=sum(r['creation_tag_agreement'] == 'mismatch' for r in rows),
+                clock_conflicts=sum(r['timing_status'] == 'clock_conflict' for r in rows))
+
+
+def check_receipt(root, receipt):
+    p = Path(receipt['path'])
+    require(not p.is_absolute() and '..' not in p.parts, 'Unsafe receipt path')
+    data = (Path(root) / p).read_bytes()
+    require(len(data) == receipt['size_bytes'], f'Size mismatch: {p}')
+    require(hashlib.sha256(data).hexdigest() == receipt['sha256'], f'Checksum mismatch: {p}')
+
+
+def validate(root, source_root=None):
+    root = Path(root)
+    strict_source = source_root is not None
+    source_root = Path(source_root or root)
+    packet = root / PREFIX
+    manifest = json.loads((packet / 'MANIFEST.json').read_text(encoding='utf-8'))
+    require(manifest['schema'] == 'recording-timing-observations/v2', 'Wrong timing schema')
+    for receipt in manifest['packet_files']:
+        check_receipt(packet, receipt)
+    matching_source_receipts = 0
+    for receipt in manifest['source_files']:
+        try:
+            check_receipt(source_root, receipt)
+            matching_source_receipts += 1
+        except ValueError:
+            if strict_source:
+                raise
+    evidence = json.loads((packet / 'observations.json').read_text(encoding='utf-8'))
+    require(evidence['schema'] == 'recording-timing-source-projection/v1', 'Wrong observation schema')
+    observations = evidence['observations']
+    counts = Counter(o['source_audit_id'] for o in observations)
+    audits = manifest['retained_local_audits']
+    require(len(audits) == len({a['source_audit_id'] for a in audits}), 'Duplicate audit receipt')
+    require(counts == {a['source_audit_id']: a['included_rows'] for a in audits}, 'Audit projection counts mismatch')
+    for audit in audits:
+        require(bool(re.fullmatch(r'[0-9a-f]{64}', audit['sha256'])), 'Invalid source audit digest')
+        require(audit['total_rows'] >= audit['included_rows'] > 0 and audit['size_bytes'] > 0, 'Invalid audit receipt')
+    require(len(manifest['record_ids']) == len(set(manifest['record_ids'])), 'Duplicate frozen cohort ID')
+    expected = build_rows(observations, source_root, manifest['source_hub_revision'], manifest['filename_timezone'], manifest['record_ids'])
+    require((packet / 'recording_timing.csv').read_bytes() == encode_rows(expected), 'Timing table differs from evidence and pinned joins')
+    result = summary(expected)
+    require(result == manifest['counts'], 'Timing coverage counts mismatch')
+    return dict(status='passed', schema=manifest['schema'], source_hub_revision=manifest['source_hub_revision'],
+                counts=result, source_file_receipts=len(manifest['source_files']),
+                matching_source_file_receipts=matching_source_receipts, strict_pinned_source=strict_source,
+                retained_local_audit_receipts=len(audits),
+                verification_scope='Published projection, frozen cohort identity joins and recomputed timing fields. Input file receipts are reported separately; --source-root additionally requires all pinned input bytes. Original local audits and video bytes are not re-read.')
+
+
+def main():
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument('--root', type=Path, default=Path(__file__).resolve().parents[1])
+    parser.add_argument('--source-root', type=Path, help='Require exact pinned source-file receipts from this checkout; otherwise check frozen IDs against current --root inputs')
+    parser.add_argument('--output', type=Path)
+    args = parser.parse_args()
+    result = validate(args.root, args.source_root)
+    text = json.dumps(result, indent=2) + '\n'
+    if args.output:
+        args.output.write_text(text, encoding='utf-8')
+    print(text, end='')
+
+
+if __name__ == '__main__':
+    main()