# C274 evidence packet

Read the C274 report, then the smaller checkpoint. This packet continues the existing 490d Mirror/529 study.

SCOPE.json freezes the four cases and exclusions. SOURCE_MANIFEST.json records fifteen immediate inputs with original paths, sizes and SHA-256 digests; their bytes are included under sources/.

The portable verifier uses Python's standard library only. From this extracted directory, run:

    python3 evidence/check_c274.py --out /absolute/path/to/new-output

It validates frozen inputs and C273 bindings, solves all four systems with exact rational row reduction, and writes six files:

- EQUATION_SOLUTIONS.json: ranks, null directions, translations and equation residuals.
- FIELD_AND_SYMMETRY_LEDGER.json: parameterized fields, J1 and full-field radius formulas.
- RADIUS_LEDGER.json: selected radii and released-condition residuals.
- REGULAR_MAPS.json: induced maps, fixed source families and parameterized local images.
- INVARIANT_MATRIX.csv: compact case comparison.
- RESULTS.json: the 139 assertion names and scope flags.

Compare the generated bytes with the corresponding evidence/ files. REPLAY.json records a completed byte-identical replay. CONTROL_INTEGRITY.json records unchanged original dependencies, File_18, File_09, C127 and C265 controls. These standing canonical files are not duplicated in this bounded packet.

CERTIFICATE.json links the predecessor and major current artifacts. ARTIFACT_MANIFEST.json inventories every payload except itself, avoiding a circular hash.

C275 is proposed only. The packet does not authorize new research or amend canonical files.