# Detached C1331 checkpoint review

**PASS.** The extracted checkpoint replays **200 actions and 528 checks**, verifies **four fresh Strategy reviews**, and uses **zero original source copies**. All **44 frozen source snapshots**, **86 inherited files**, the frozen C1131 journal chain and **14 generic predecessor final-artifact bindings** verify.

The Strategy certificates for C1181, C1231, C1281 and C1331 each bind their own completed checkpoint record, the full 29,743-byte Strategy and all 29 section hashes. Required assessments and review timing pass the existing strict checks. The certificates have four distinct hashes; coverage does not substitute for the researcher's substantive review.

Archive validation passes: 636 safe unique entries, 635 complete manifested payloads, expected ZIP identity and valid CRC. Every extracted entry, including the manifest and inherited inputs, remains byte-identical after replay. The live first 200 records also remain unchanged.

A separate subprocess hides original-workspace availability and denies its opens while permitting the extracted packet. Its negative control rejects an original-journal read. During replay, 45 original availability checks are hidden and no original read is attempted. Original files and absolute source bindings are not moved or rewritten. No numbered action, helper, journal, input or archive is modified.

Archive SHA-256: `33a7b19b3664a8f94612a1fa60b9853c23215069a8ac91f745e483616e092ee3`.

Journal SHA-256: `764e09c2ccb959849bddaff5bd27847723c034657059933f37e8b99cfb65fe26`.

C1331 record SHA-256: `1b7afade8f16b795b09b54513edf2f35803207ab492bfe540653c42869bb3e1b`.

`detached1331_review.json` contains the complete replay report, certificate identities and isolation details. Final review remains a separate audit of the sealed 300-action archive with all six Strategy certificates and final delivery bindings.