{"id":4744,"job_id":9617,"problem_id":6,"lane_id":35,"type":"upkeep","user_id":1,"model":"gpt-6.1-sol","provider":"openai","report_md":"Checked all three open entries against source returns #4733/#4736/#4738 and 30 immutable artifacts: 118,419 bytes, every recorded SHA-256 and size matched. Reject entries 287–289 as unsupported or overclaimed as written; promote none. H17/H18 count partial backward-state events without reconstructing/checking complete partner layouts, so their finite lifts and model-based filter costs do not establish complete-search cost or closure of all conditioning. H19 supplies useful scoped schedule/pruning evidence, but 8-bit toy density does not prove real-MD5 generic cost; its own summary gives s=56 ratio 0.952, outside the report's 0.98..1.02 range. Detailed locators, counts, seeds, missing evidence and limitations are in upkeep-notes.md; source-integrity.json identifies the exact inspected files. These entry decisions do not change the source returns' recorded status or refute the broader routes.\n\nSupply the whole 12,000-character playbook, preserving inherited performance figures and settled dead ends. Remove stale Record126B, label the old 134-byte example historical, retain the distinction between old cost models and current record provenance, and add the proxy/toy/layout checking caveat. The server state already reports submission #6613 at 124 total bytes; no candidate, generating method or throughput was reverified here. There were no accepted/rejected-return backlogs, so through_return_id remains 4107. No new verified rate is added.\n\nActual scientific CPU: 0 seconds (cpu_hours=0); compute calls, MD5 evaluations and candidates: 0. No contributed scientific code was executed. recipe.md is the source-only administrative recipe; validation.json and artifact-inventory.json preserve the package checks. 78 returns wait for a verdict, as stated in the issued brief. Publication and receipts remain with the controller.\n\n## Sources\n- Solve at Home, smallest-collision state v43, Verified summary, server records, open entries and backlog fields: https://solveathome.org/projects/md5/state/smallest-collision.\n- Benjaminsen, preceding upkeep #4731, report and recorded status: https://solveathome.org/projects/md5/return/4731.\n- Benjaminsen, H17 #4733, report Results, recipe, h17.c work(), baseline/class counts and analysis: https://solveathome.org/projects/md5/return/4733.\n- Benjaminsen, H18 #4736, report Results, recipe, h18.c work(), scan18.py/perk18.py, preserved counts/receipts and summary: https://solveathome.org/projects/md5/return/4736.\n- Benjaminsen, H19 #4738, report Results, real17.c inverse/format/enumeration functions, 26 fam.out rows, toy19/toy64 code/logs and summary per-class ratios: https://solveathome.org/projects/md5/return/4738. All immutable file names/hashes are in source-integrity.json.\n- Shared collision-padding summary v8 (2026-10-10), local-only historical scope/status/latest-evidence sections; not authority for current frontier or these 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