# C269 evidence packet

Completed 24 September 2026. Continues the existing 490d Unified Chronology research after C268.

Read `490d_C269_LXX_Closing_Sources_and_17K_Paths_20260924.md`, then `490d_Mirror_Checkpoint_After_C269_20260924.md`. C270 is proposed, not executed.

## Reproduce the calculation

From this directory, using Python 3 and its standard library:

```sh
python evidence/check_c269.py --output /tmp/490d_c269_replay
```

The verifier uses sixteen frozen inputs in `sources/`, listed with sizes and SHA-256 values in `SOURCE_MANIFEST.json`. It passes 145 assertions and writes six files:

- `SOURCE_PATHS.json`: N02/N04 subdivisions, the bilateral source link, inherited C254 closing route and C09 limit.
- `GRAPH_INCIDENCE.json`: actual selected C127 nodes and directed edges, with absent closing-node status explicit.
- `CLOSING_RECTANGLE.json`: four source identities, the 600/8993 sides and the intermediate 598+2 split.
- `OPERATOR_COMPARISON.json`: source translations versus C268 affine charts and their anchor/phase differences.
- `RESULTS.json`: assertion ledger and bounded conclusion.
- `SOURCE_PATHS.csv`: compact ordered interval table.

`REPLAY.json` records byte-identical reproduction of these six files. The authored report and checkpoint are not replay outputs. Independent mathematical, graph/source and final reviews are in `evidence/`.

## Integrity and scope

`SCOPE.json` records the finite domain and selective recovery of C254's already completed closing route. `CONTROL_INTEGRITY.json` records unchanged original inputs, the 208-node/382-duration-edge C127 graph and the C265 certificate at publication. Absolute original paths are provenance references; they are not required for reproduction elsewhere.

`CERTIFICATE.json` links to C268 and binds the report, checkpoint, source manifest, results, replay and control-integrity record. `ARTIFACT_MANIFEST.json` inventories all other payload files, excluding itself to avoid a circular hash.

The new attachment subdivisions are source-supported comparisons, not stored graph additions. C254's closing route is inherited, not a new C269 discovery. No canonical source or graph was edited, earlier campaign rerun, new event search executed, or additional Gear authorized. Regular Gears remain Noah/Shem/Flood only.