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+# Phase 1.7: PDF Structural Fingerprint — Coordinator Close Summary
+
+## Overview
+Phase 1.7 (PDF Structural Fingerprint) is complete. All 4 child beads have been closed, implementing a reproducible 256-bit content hash that identifies the semantic content of a PDF independent of metadata churn, byte ordering, and producer-tool re-saves.
+
+## Child Beads Closed
+
+1. **pdftract-q15sh** — Fingerprint algorithm implementation (Merkle SHA-256 over canonicalized inputs)
+   - Location: `crates/pdftract-core/src/fingerprint/mod.rs`
+   - See: `notes/pdftract-q15sh.md`
+
+2. **pdftract-154mz** — Per-page input canonicalization (geometry rounding, content stream normalization)
+   - Location: `crates/pdftract-core/src/fingerprint/canonicalize.rs`
+   - See: `notes/pdftract-154mz.md`
+
+3. **pdftract-3954u** — `pdftract hash` CLI subcommand with exit codes 0/2/3/4/5/6
+   - Location: `crates/pdftract-cli/src/main.rs`
+   - See: `notes/pdftract-3954u.md`
+
+4. **pdftract-ef6xz** — Fingerprint reproducibility test corpus
+   - Location: `tests/fingerprint/fixtures/`
+   - See: `notes/pdftract-ef6xz.md`
+
+## Acceptance Criteria Verification
+
+### ✅ All 4 child beads closed
+All child beads show Status: closed in `bf show`.
+
+### ✅ Algorithm v1 stable and documented
+Documentation exists at `crates/pdftract-core/src/fingerprint/algorithm.md` (5.1 KB).
+Algorithm version prefix is `pdftract-v1:` (INV-13 compliant).
+
+### ✅ All 5 Critical tests pass (73 total fingerprint tests)
+Test run on 2025-06-03:
+```
+cargo nextest run -j 4 --package pdftract-core fingerprint
+Summary: 73 tests run: 73 passed, 3083 skipped
+```
+
+Critical tests verified:
+- `test_fixture_acrobat_resave` — Acrobat re-saves produce identical fingerprint ✅
+- `test_fixture_pdftk_resave` — pdftk re-saves produce identical fingerprint ✅
+- `test_fixture_metadata_only` — CreationDate-only changes preserve fingerprint ✅
+- `test_fixture_content_edit_one_glyph` — Content edits change fingerprint ✅
+- `test_fixture_linearization_toggle` — Linearization toggle preserves fingerprint (KU-7) ✅
+
+### ✅ INV-3 (byte-stable across runs)
+Test: `test_inv3_reproducibility_100_invocations`
+Verifies 100 invocations on the same PDF produce identical fingerprint output.
+Result: PASS (0.011s runtime)
+
+### ✅ INV-13 (version prefix on every emission)
+Tests: `test_inv13_fingerprint_format`, `test_inv13_multiple_outputs_match_format`
+Verifies output matches regex `^pdftract-v1:[0-9a-f]{64}$`
+Result: PASS
+
+### ✅ CLI command functional
+```bash
+$ ./target/release/pdftract hash tests/fingerprint/fixtures/acrobat_resave/v1.pdf
+pdftract-v1:ab24a95f44ceca5d2aed4b6d056adddd8539f44c6cd6ca506534e830c82ea8a8
+```
+
+## Implementation Summary
+
+### Algorithm (Merkle-style SHA-256)
+Inputs in deterministic order:
+1. Page count (u32, big-endian)
+2. Per page (in page_index order):
+   a. SHA-256 of decoded, token-normalized content streams
+   b. SHA-256 of resolved resource dict (sorted by namespace/key)
+   c. Page geometry: MediaBox, CropBox, Rotate (4-decimal fixed-point)
+3. Structure tree SHA-256 (if tagged; all-zero hash otherwise)
+4. Catalog feature flag byte (encrypted, javascript, XFA, OCG bits)
+
+Deliberately excluded (per ADR-008):
+- `/Producer`, `/Creator`, `/CreationDate`, `/ModDate`, `/Author`, `/Title`, `/Subject`, `/Keywords`
+- `/ID` array, XMP `/Metadata` stream
+- xref byte layout, object number assignment
+- Inline whitespace (lexer-normalized before hashing)
+
+### CLI Interface
+- Command: `pdftract hash <INPUT>` (file path or URL)
+- Output: `pdftract-v1:<64-hex-chars>\n`
+- Exit codes: 0 success, 2 corrupt, 3 encrypted-no-password, 4 cannot read, 5 network failure, 6 TLS handshake failure
+
+## Downstream Dependencies
+
+This fingerprint is now available for:
+- **Phase 6.8 receipts** — binding identity for receipt verification
+- **Phase 6.9 cache** — content-addressed cache key for extraction results
+- **Users** — identify PDFs across re-saves via `pdftract hash`
+
+## Related Plan References
+- Plan: Phase 1.7 PDF Structural Fingerprint (lines 1182-1219)
+- ADR-008 (fingerprint excludes metadata)
+- INV-3, INV-13 (byte-stability, version prefix)
+- KU-7 (linearization toggle test)
+
+## Git Commits
+This coordinator bead did not introduce new code commits; its child beads each produced their own commits.
+See child bead verification notes for individual commit details.