diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index b2467e856c..bc782d15a9 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -569,6 +569,7 @@ Rohan Arun receives explicit mechanism credit for #987’s slot search and first
 - **Cinna Davis / 1337isnot1337:** [#1090](https://github.com/CrocSwap/integer-mult-bounds/pull/1090).
 - **David Breslauer / davidNbreslauer:** [#1072](https://github.com/CrocSwap/integer-mult-bounds/pull/1072).
 - **thakrarsagar / thakrarsagar:** [#1049](https://github.com/CrocSwap/integer-mult-bounds/pull/1049), [#1051](https://github.com/CrocSwap/integer-mult-bounds/pull/1051), [#1069](https://github.com/CrocSwap/integer-mult-bounds/pull/1069), [#1059](https://github.com/CrocSwap/integer-mult-bounds/pull/1059), [#1023](https://github.com/CrocSwap/integer-mult-bounds/pull/1023), [#1045](https://github.com/CrocSwap/integer-mult-bounds/pull/1045), [#1062](https://github.com/CrocSwap/integer-mult-bounds/pull/1062).
+- **Aaron Wang / navinor:** [#1015](https://github.com/CrocSwap/integer-mult-bounds/pull/1015) (open; own package pending review). Its nine phase-B multi-write block programs are retained verbatim in #1062 (`research/r439-bsection-stars-seed01/inputs/PR1015-CANDIDATE.json`) and supply 244 of #1062's 283 saved ADDs; see the [retention receipt](research/r439-pr1015-retention-seed95/README.md).
 - **steph4n / steph4n-gh:** [#1052](https://github.com/CrocSwap/integer-mult-bounds/pull/1052).
 - **Josie Elliston / JosieElliston:** [#1091](https://github.com/CrocSwap/integer-mult-bounds/pull/1091).
 - **flemhhh / flemhhh:** [#1048](https://github.com/CrocSwap/integer-mult-bounds/pull/1048) (reviewed; corrections pending).
diff --git a/research/r439-pr1015-retention-seed95/NOTICE-PR1015.md b/research/r439-pr1015-retention-seed95/NOTICE-PR1015.md
new file mode 100644
index 0000000000..727d5b5862
--- /dev/null
+++ b/research/r439-pr1015-retention-seed95/NOTICE-PR1015.md
@@ -0,0 +1,14 @@
+# Notice
+
+R439 phase-B multi-write block programs, 2026.
+
+Built on the PR555/PR589 R439 supplier and its retained notices (eumemic,
+DreamingOfClouds, Dylan Crow, Zhihao Chen and predecessors). The verifier
+uses the repository's pinned owning interface checker and record exporter.
+Block-level comparison credit: PR #891 (Aaron Wang), PR #880 (Krishnendu
+Purohit), PR #884 (martin Rv), PRs #857/#873/#906/#908/#914/#923 and the
+prefix-resynthesis line #904/#936/#952; none of their implementations or
+savings is imported.
+
+Prepared with help from opencode. New files are offered under the
+repository's Apache-2.0 license. No independent human review is claimed.
diff --git a/research/r439-pr1015-retention-seed95/README.md b/research/r439-pr1015-retention-seed95/README.md
new file mode 100644
index 0000000000..819e94e1a1
--- /dev/null
+++ b/research/r439-pr1015-retention-seed95/README.md
@@ -0,0 +1,62 @@
+# Retention receipt: #1015's block programs in main through #1062
+
+**Research consolidation (credit and provenance). No new κ; no ledger, disposition or construction change.**
+
+Main `c0e3631d` retains open PR #1015's work verbatim, but no ledger row, credit line or retained notice says so.
+This receipt records the fact with hashes and adds the missing credit. It corrects an omission in my own #1062,
+which copied the file.
+
+| fact | evidence |
+|---|---|
+| retained file | `research/r439-bsection-stars-seed01/inputs/PR1015-CANDIDATE.json` (merged with #1062) has git blob `16532f2d`, identical to `research/r439-bsection-multwrite/CANDIDATE.json` at #1015's open head `7588c797` |
+| what it contributes | 9 of the 10 phase-B block programs spliced into #1062's word |
+| share of #1062's saving | 11,783 → 11,500 ADDs: **PR1015 244**, PR923 24, rerun star pass 15 (recomputed from #1062's `CERTIFICATE.json`; each gate saved counts twice, block plus literal cleanup) |
+| ledger | `docs/research/pr-ledger.json` has a #1062 row whose scope names "nine PR1015 blocks", and no #1015 row |
+| credit | `CONTRIBUTORS.md` credited #1062 and had no #1015 entry |
+| notice | #1062's package has no NOTICE. #1015's `NOTICE.md` (blob `727d5b58`: Apache-2.0 offer, AI disclosure "Prepared with help from opencode", predecessor credits) was not retained beside the copied file. #1062's README and SOURCES.json do credit and pin #1015. |
+
+## Change
+
+- Adds `NOTICE-PR1015.md`, #1015's `NOTICE.md` byte for byte (blob `727d5b58`), so the license offer and AI
+  disclosure accompany the retained file in main.
+- Adds one `CONTRIBUTORS.md` line in the batch #1099 section, crediting Aaron Wang / navinor for #1015's retained
+  programs. This follows the precedent of #946, "credited as pending integration".
+- Does not edit `pr-ledger.*`, any batch disposition, the #1062 package or the selected record. #1015 stays open for
+  its own review. Whether the ledger records it as "partially retained via #1062" is a maintainer decision.
+
+```sh
+python3 -I -B research/r439-pr1015-retention-seed95/verify.py
+```
+
+Expected (read-only, no network, standard library only):
+
+```text
+base ledger: #1015 row absent (gap recorded)
+PASS_R439_PR1015_RETENTION blob=16532f2d saving=PR1015:244+PR923:24+star15=283 controls=2
+```
+
+The script recomputes both blob ids and the per-source split, and checks the credit line. It asserts the missing
+ledger row only while the ledger is still the base blob; after a maintainer update it reports the new state
+instead. Two negative controls must fail: a block misattributed to PR923, and a one-byte change to the retained
+file.
+
+## Reviewer notes for related open PRs
+
+These were observed read-only at the stated heads and are not checked by `verify.py`.
+
+- **#1122** (`a2551e70`, compose R439 A/B/star D to 10,652 ADDs) is a strict superset of merged #1062 plus merged
+  #980's A part. Its `vendor/pr1062` files are byte-identical to main's merged files, so its "pending PR1062"
+  wording is now stale. Its 848-not-872 accounting for #980 is forced: #980's B edits fall in frames 507–509 and
+  519–523, inside the ten blocks #1062 replaces.
+- **#1127** (`2e9dc9d3`, 3→2 z-program rewrites) is not additive to #1062 or #1122 as packaged. All 330 of its A
+  moves fall in frames already rewritten by PR904–980, and all 75 of its B moves fall inside the ten replaced blocks.
+
+## Provenance
+
+Selected by a consolidation-track task card (`overlap-receipt`) from `scripts/choose_research_task.py --track
+consolidation`. The track came from OS-random seed 95 under the user's sprint assignment. Base `c0e3631d`;
+heads observed on 2026-10-14. Five explorer subagents evaluated alternative consolidation scopes and three judges
+scored them. The scope was then narrowed to this credit gap, which is new and hash-checkable.
+
+`NOTICE-PR1015.md` is Aaron Wang's text, retained under the repository's Apache-2.0 license. Everything else here was
+prepared by Sagar Thakrar with substantial assistance from Anthropic Claude (Claude Code). Apache-2.0.
diff --git a/research/r439-pr1015-retention-seed95/RECEIPT.json b/research/r439-pr1015-retention-seed95/RECEIPT.json
new file mode 100644
index 0000000000..8e86126144
--- /dev/null
+++ b/research/r439-pr1015-retention-seed95/RECEIPT.json
@@ -0,0 +1,67 @@
+{
+ "status": "PR1015_RETAINED_VIA_PR1062_RECEIPT_NO_NEW_KAPPA",
+ "base_commit": "c0e3631dc24e3c24a861f7d3d79e0608481cccec",
+ "observed_on": "2026-10-14",
+ "pr1015": {
+  "state": "OPEN",
+  "head": "7588c797f4a4e9f2b9fc663cfa6e35afcac05e06",
+  "author": "navinor (Aaron Wang)",
+  "package": "research/r439-bsection-multwrite/"
+ },
+ "pr1062": {
+  "state": "MERGED",
+  "reviewed_head": "cd016e5dcd5ba28dafa3f3b4eeef003a38e6a11b",
+  "package": "research/r439-bsection-stars-seed01/",
+  "integrated_by": "0a31ad88 (batch1099 checkpoint 1)"
+ },
+ "retained_file": {
+  "path": "research/r439-bsection-stars-seed01/inputs/PR1015-CANDIDATE.json",
+  "pr1015_head_path": "research/r439-bsection-multwrite/CANDIDATE.json",
+  "pr1015_head_blob": "16532f2d8d4fb16fde803cecf32e3ce11369ea56",
+  "sha256": "388c2a0db00dbe77b67649af7293e577cf3869da7ae0d0341e17ecff2b16c84c"
+ },
+ "pr1062_saving": {
+  "per_source": {
+   "PR1015": 244,
+   "PR923": 24
+  },
+  "star_rerun": 15,
+  "total": 283,
+  "words": {
+   "helper_star": 11783,
+   "composition": 11515,
+   "candidate": 11500
+  },
+  "rule": "2 x (original_gates - new_gates) per spliced block (block plus literal cleanup); star rerun = composition - candidate"
+ },
+ "pr1015_notice": {
+  "path": "research/r439-bsection-multwrite/NOTICE.md",
+  "blob": "727d5b586299ff1615b749f9f273c823b26e711d",
+  "retained_here_as": "NOTICE-PR1015.md",
+  "content": "Apache-2.0 offer of new files; AI disclosure 'Prepared with help from opencode'; predecessor credits"
+ },
+ "gaps_before_this_change": {
+  "pr_ledger": "docs/research/pr-ledger.json pull_requests has a #1062 row (scope names 'nine PR1015 blocks') and no #1015 row (blob 4b08a8e6 at base)",
+  "contributors": "CONTRIBUTORS.md (blob b2467e85 at base) credits #1062 under thakrarsagar in the batch #1099 section and has no #1015 entry",
+  "notice": "research/r439-bsection-stars-seed01/ has no NOTICE or LICENSE and does not carry #1015's NOTICE.md; its README and SOURCES.json do credit and pin #1015",
+  "batch1099": "#1015 appears in research/community-batch1099-audit only as an open queue entry; CONTENT-COVERAGE.json lists the copied file as retained without linking #1015"
+ },
+ "change": {
+  "added": "research/r439-pr1015-retention-seed95/ (README.md, RECEIPT.json, NOTICE-PR1015.md, verify.py)",
+  "contributors_md": "one credit line in the batch #1099 section, following the #946 'credited as pending integration' precedent"
+ },
+ "contributors_line": "- **Aaron Wang / navinor:** [#1015](https://github.com/CrocSwap/integer-mult-bounds/pull/1015) (open; own package pending review). Its nine phase-B multi-write block programs are retained verbatim in #1062 (`research/r439-bsection-stars-seed01/inputs/PR1015-CANDIDATE.json`) and supply 244 of #1062's 283 saved ADDs; see the [retention receipt](research/r439-pr1015-retention-seed95/README.md).",
+ "reviewer_notes_not_checked_by_verify": {
+  "pr1122": {
+   "head": "a2551e70fce0cc34348f50f1a94e7cc4c80bbcbf",
+   "note": "Composes merged #1062 (B 800, D 5548) with merged #980's A part (A 1706): corner 7 = 10,652 ADDs. Its vendor/pr1062 files are byte-identical to main's merged #1062 files, so its 'pending PR1062' wording is stale. Its 848-not-872 accounting for #980 is forced: #980's B edits fall in frames 507-509 and 519-523, inside the ten blocks #1062 replaces."
+  },
+  "pr1127": {
+   "head": "2e9dc9d3356a6b7258ed869ddcee46352907f746",
+   "note": "Its 405 moves are not additive to #1062/#1122 as packaged: 330/330 A moves fall in frames already rewritten by PR904-980 and 75/75 B moves fall inside the ten blocks #1062 replaces."
+  }
+ },
+ "not_done": "No ledger, disposition or batch-record edits; no change to the #1062 package; #1015 stays open for its own review; no closures; no kappa change (the selected #1094 uses the PR589 bit word and the bit side does not bind).",
+ "ledger_blob_at_base": "4b08a8e68cb73f693732cd74363c7974dfd38607",
+ "contributors_blob_at_base": "b2467e856c543881ce5b2315bc7897329f9ec2fb"
+}
diff --git a/research/r439-pr1015-retention-seed95/verify.py b/research/r439-pr1015-retention-seed95/verify.py
new file mode 100644
index 0000000000..8fa4f37b43
--- /dev/null
+++ b/research/r439-pr1015-retention-seed95/verify.py
@@ -0,0 +1,90 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: Apache-2.0
+# Prepared by Sagar Thakrar with substantial Anthropic Claude assistance.
+"""Read-only check of the #1015 retention receipt against files in this checkout (no network).
+
+1. main's research/r439-bsection-stars-seed01/inputs/PR1015-CANDIDATE.json has the git blob id of
+   research/r439-bsection-multwrite/CANDIDATE.json at open #1015's head 7588c797 (pinned below);
+2. NOTICE-PR1015.md here is #1015's NOTICE.md at that head, byte for byte (pinned blob id);
+3. #1062's saving splits as PR1015 244 + PR923 24 + rerun star pass 15 = 283 ADDs, recomputed from
+   research/r439-bsection-stars-seed01/CERTIFICATE.json (gate deltas count twice: block plus literal cleanup);
+4. CONTRIBUTORS.md carries the #1015 credit line added with this receipt; the ledger's missing #1015 row is asserted
+   only while docs/research/pr-ledger.json is still the base blob, and otherwise reported.
+Two negative controls must fail: a block misattributed to PR923, and a one-byte change to the retained file.
+"""
+import copy
+import hashlib
+import json
+import sys
+from pathlib import Path
+
+HERE = Path(__file__).resolve().parent
+ROOT = HERE.parents[1]
+RECEIPT = json.loads((HERE / 'RECEIPT.json').read_text())
+
+
+def need(ok, msg):
+    if not ok:
+        raise SystemExit('FAIL ' + msg)
+
+
+def blob(data):
+    return hashlib.sha1(b'blob %d\0' % len(data) + data).hexdigest()
+
+
+def attribution(cert):
+    per = {}
+    for b in cert['blocks']:
+        per[b['source']] = per.get(b['source'], 0) + 2 * (b['original_gates'] - b['new_gates'])
+    words = {k: v['literal']['native_ADDs'] for k, v in cert['words'].items()}
+    return dict(per_source=per, star_rerun=words['composition'] - words['candidate'],
+                total=words['helper_star'] - words['candidate'], words=words)
+
+
+def check(cert, retained, notice):
+    r = RECEIPT
+    need(blob(retained) == r['retained_file']['pr1015_head_blob'], 'retained file is not #1015 CANDIDATE.json at its head')
+    need(blob(notice) == r['pr1015_notice']['blob'], 'NOTICE-PR1015.md differs from #1015 NOTICE.md')
+    a = attribution(cert)
+    want = r['pr1062_saving']
+    need(a['per_source'] == want['per_source'] and a['star_rerun'] == want['star_rerun'] and a['total'] == want['total'],
+         'saving attribution %s' % a)
+    need(sum(a['per_source'].values()) + a['star_rerun'] == a['total'], 'saving does not add up')
+    return a
+
+
+def main():
+    cert = json.loads((ROOT / 'research/r439-bsection-stars-seed01/CERTIFICATE.json').read_text())
+    retained = (ROOT / RECEIPT['retained_file']['path']).read_bytes()
+    notice = (HERE / 'NOTICE-PR1015.md').read_bytes()
+    a = check(cert, retained, notice)
+    raw = (ROOT / 'docs/research/pr-ledger.json').read_bytes()
+    numbers = {row['number'] for row in json.loads(raw)['pull_requests']}
+    need(1062 in numbers, 'ledger row for #1062')
+    if blob(raw) == RECEIPT['ledger_blob_at_base']:     # the recorded gap holds only for the base ledger
+        need(1015 not in numbers, 'base ledger unexpectedly has a #1015 row')
+        ledger = 'base ledger: #1015 row absent (gap recorded)'
+    else:
+        ledger = 'ledger changed since base: #1015 row %s' % ('present' if 1015 in numbers else 'still absent')
+    contributors = (ROOT / 'CONTRIBUTORS.md').read_text()
+    need(RECEIPT['contributors_line'] in contributors, 'CONTRIBUTORS.md lacks the #1015 credit line')
+    controls = []
+    bad = copy.deepcopy(cert)
+    next(b for b in bad['blocks'] if b['source'] == 'PR1015')['source'] = 'PR923'
+    try:
+        check(bad, retained, notice)
+    except SystemExit:
+        controls.append('misattributed block rejected')
+    try:
+        check(cert, retained[:-1] + bytes([retained[-1] ^ 1]), notice)
+    except SystemExit:
+        controls.append('modified retained file rejected')
+    need(len(controls) == 2, 'negative controls: %s' % controls)
+    print(ledger)
+    print('PASS_R439_PR1015_RETENTION blob=%s saving=PR1015:%d+PR923:%d+star%d=%d controls=%d' % (
+        RECEIPT['retained_file']['pr1015_head_blob'][:8], a['per_source']['PR1015'], a['per_source']['PR923'],
+        a['star_rerun'], a['total'], len(controls)))
+
+
+if __name__ == '__main__':
+    main()