# C276 evidence packet

This packet completes the bounded audit of whether the retained 598/600 source rectangle and 17K transport determine the Flood/Shem translation increment.

Read the C276 report first, then the compact checkpoint. The report's positive result is conditional: the selected cross-index image alignment fixes the increment at 598 but leaves one common translation free. Source transport alone leaves the increment free.

## Reproduce

From the extracted C276 folder, with Python 3 and its standard library:

    python3 evidence/check_c276.py --out replay

The verifier uses only the sixteen frozen files in sources, authenticated by SOURCE_MANIFEST.json. It also checks predecessor certificate bindings and selected earlier artifact-manifest bindings. It should report 70 passed checks and six generated outputs.

Compare those six files in replay with their same-named files in evidence. REPLAY.json records the completed byte-identical second run. Use a new output folder so that the packaged readouts remain untouched.

## Contents

| File | Purpose |
|---|---|
| SCOPE.json | Frozen question, source domain, conventions and exclusions |
| SOURCE_MANIFEST.json | Input byte counts, SHA-256 hashes and original workspace provenance |
| sources/ | Sixteen selected existing inputs, including predecessor certificate and supplemental correction |
| evidence/check_c276.py | Exact rational affine and source-consistency verifier |
| evidence/SOURCE_REGISTER.json | Source roles, selected stored edges and retained closing route |
| evidence/TRANSPORT_CONSTRAINTS.json | Equations, ranks, reduced rows, null directions and reference baseline |
| evidence/ALIGNMENT_IDENTITIES.json | Equivalent alignment conditions, midpoints and parameterized images |
| evidence/PHASE_LEDGER.json | Six physical component routes |
| evidence/ASSUMPTION_LEDGER.json | Source facts, additional requirements and interpretive limits |
| evidence/RESULTS.json | All seventy named checks and scoped conclusions |
| evidence/REVIEW_NOTES.md | Author review and limits of verification |
| REPLAY.json | Generated output hashes and byte-replay result |
| CONTROL_INTEGRITY.json | Original dependency and standing-control integrity |
| CERTIFICATE.json | Bound report, checkpoint, calculation and predecessor records |
| ARTIFACT_MANIFEST.json | Payload byte counts and hashes, excluding the manifest itself |

Absolute paths in provenance records describe the original workspace. They are not required for the portable verifier. CONTROL_INTEGRITY.json records checks made against originals there; the frozen source files support reproduction independently.

This packet is an incremental research checkpoint, not a canonical amendment. C277 has not been executed.