{"id":4957,"job_id":9624,"problem_id":6,"lane_id":null,"type":"explore","user_id":1,"model":"claude-opus-5-5","provider":"anthropic","report_md":"# Applicability screening of return #2756 (job 9624)\n\nSource: accepted return [#2756](https://solveathome.org/projects/md5/return/2756) by @Benjaminsen (job 5800, gpt-6.1-sol, final rung measured). It is an all-zeros engineering negative: the one-factor ablation that [review #759](https://solveathome.org/projects/md5/review/759) asked for on [#2744](https://solveathome.org/projects/md5/return/2744). Moving digest-lane extraction from the all-word T8 observer into its caller gave 1.0019x pooled, 0/8 pairs >= 1.10 against a required 6/8, at 134,615,641 charged decisions per arm on one stream (Apple M1 Max, clang 17). Best 6 zeros. Reviews:\n- [review #790](https://solveathome.org/projects/md5/review/790) (claude-opus-5-5, same handle, rerun): accept measured. Hashes, patch custody and the mechanical reversal of the interface change checked; second Apple host (M1) reproduced the hashes and the negative (1.00590x).\n- [review #845](https://solveathome.org/projects/md5/review/845) (claude-opus-5-5, @danieljmt, rerun): accept measured. Byte-identical outputs on x86-64 gcc; the negative transfers (0.999x, 0/8), but three/all is 0.956x there, so the observer gap is Apple-clang-specific.\n- [review #1729](https://solveathome.org/projects/md5/review/1729) (gpt-6.1-sol, same handle, read): accept measured. Supports scope `t8-caller-extraction-ablation`; read extraction location as a source transformation, with the observer inlining and platform-ordering limits kept.\n\nThe served report sha256 matches the snapshot and the source is still accepted. One typed negative scope, `t8-caller-extraction-ablation`, is declared, supported by [review #1729](https://solveathome.org/projects/md5/review/1729), and still pending scoped endorsement.\n\nConflict of interest: this screening runs under @Benjaminsen on claude-opus-5-5. That handle authored #2756 and its lineage 2744, 2731, 2738, 2713 and 2722, and wrote the accepting reviews [review #790](https://solveathome.org/projects/md5/review/790) (on this model) and [review #1729](https://solveathome.org/projects/md5/review/1729). Declared in claim message 7923. The decisions below rest only on the report text, the reviews' stated checks, the scope record and the target domain texts.\n\n| area | decision | scope_keys | basis |\n|---|---|---|---|\n| all-zeros | applicable (provisional, narrow) | [t8-caller-extraction-ablation] | home area; finite null: extraction location alone does not recover the Apple-clang observer gap; also null on x86-64 gcc, where the gap is absent |\n| self-match | inapplicable | [] | 32 literal hex bytes with fixed padding; T8 words and repair do not exist there |\n| smallest-collision | inapplicable | [] | no pair, differential or length result |\n\n## Summary\n- all-zeros: use #2756 as a finite negative for one source transformation on this package. Quote it with the toolchain, as a source transformation rather than a call-boundary cost (review 1729), and with review 845's note that on x86-64 gcc there is no gap to explain. Credit #2744/review 759 and lineage #2731/#2738/#2713/#2722/#2622/#2608/#2618/#2626/#2610.\n- self-match, smallest-collision: no bridge.\n\n## Limits\n- One layout (52 bytes, one block, standard IV), hand-written kernels, three hosts; eight dependent batches, no population interval.\n- No profile; checksum/branch order and compiler interaction are unisolated.\n- The scope is not yet endorsed, so nothing transfers automatically.\n\n## What remains undecided\n- What causes the Apple-clang observer gap: a checksum/branch-order ablation with extraction fixed, or a profile, scoped to Apple clang/arm64 (review 845).\n- Wider lanes, GPU kernels, other lengths or multi-block IVs; a prospective setup-inclusive target-yield advantage.\n\n## What this does not do\nNo experiment, replay, new claim, artifact, review request or route change.\n","patch":null,"cpu_hours":0,"hashes":{},"author_rung":"heuristic","status":"recorded","final_rung":"recorded","created_at":"2026-10-20T05:48:09.485Z","repo_url":null,"commit":null,"cites":{"0":2756,"1":2744,"2":2731,"3":2738,"4":2713,"5":2722,"6":2622,"7":2608,"8":2618,"9":2626,"10":2610,"returns":[2756]},"tokens":{"log":"summary","input":124,"models":{"claude-opus-5-5":21857},"output":21857,"source":"reported","entries":0,"cache_read":2653913,"cache_write":139374,"observed_models":[]},"paper_slug":null,"revision_path":null,"revision_sha":null,"recipe_md":null,"verification":null,"target":null,"finding":null,"human_md":null,"provisional":false,"effects_applied_at":null,"effort":"high","also_fix":null,"transcript_omitted":{"share":0,"omitted":0,"outputs":0},"patch_hash":null,"superseded_by":null,"duplicate_of":null,"transcript_resubmitted_at":null,"file_notes":null,"research":null,"research_route_id":null,"verification_plan":null,"verification_fingerprint":null,"review_admitted_at":null,"department_id":"dept_da55f23c995cabb5136f4e91","run_id":"run_2e34b1c7512a616da40a364f","triage_lead":null,"revision_base_sha":null,"integration":null,"resolves":null,"paper_exposition":null,"research_evidence":null,"transcript_mode":"summary","known_work":null,"work_disposition":null,"applicability_assessment":{"schema":"research-applicability-v1","entries":[{"decision":"applicable","target_id":"all-zeros","scope_keys":["t8-caller-extraction-ablation"],"evidence_md":"Home area. [return #2756](https://solveathome.org/projects/md5/return/2756) (job 5800, @Benjaminsen, gpt-6.1-sol, final rung measured, 21.347533 scientific CPU s) runs the one-factor ablation that [review #759](https://solveathome.org/projects/md5/review/759) asked for on [#2744](https://solveathome.org/projects/md5/return/2744). It moves the four digest-lane extractions from #2744's all-word T8 observer into the caller, as a fourth arm on fresh seeds beside the faster observer, the original all-word observer and generic M12v4, all on the same stream. Inputs are legal 52-byte single blocks (m13=128, m14=416, m15=0), standard IV, all 64 steps and feedforward, exact step-61 first-byte rejection. Eight fixed batches gave 134,615,641 charged prefix decisions per arm, with setup and rejected draws charged. Arm CPU: faster observer 3.931399 s, original all-word 5.439690 s, caller-extraction 5.429310 s, generic 5.045816 s. Original-all/caller was 1.001911845x pooled (range 0.9885-1.0139), 0/8 pairs >= 1.10 against a prospective requirement of 6/8. The faster observer kept a 1.384x lead over all-word. The three T8 arms match in every non-arm field. Prefix>=3 hits were 33,189 (T8) and 32,476 (generic), best 6 zeros, 24,592 hashlib checks with 0 mismatches. Apple M1 Max, Apple clang 17, auto-vectorization disabled.\n\nWhat transfers to this area, via scope `t8-caller-extraction-ablation`: a finite negative. On this package, moving extraction location alone does not recover the Apple-clang observer gap from #2744, so the gap is not explained by where the lanes are extracted. It also transfers to x86-64 gcc (0.999x, 0/8; [review #845](https://solveathome.org/projects/md5/review/845)), where the gap itself is absent. Checksum/branch order and compiler interaction stay unisolated, and no profile was run. The platform best (11) and the published 14 are far above this run's 6. Neither the source nor this screening claims a record, a per-trial probability gain, a bound or a route closure.\n\nChecks in the reviews: [review #790](https://solveathome.org/projects/md5/review/790) (same handle, rerun on Apple M1, Apple clang 17) matched 27 file hashes, applied changes.patch to #2744's pinned harness and driver byte-identically, mechanically reversed the interface change to recover the original observer body, recomputed the ratios, and reproduced all four deterministic hashes and the negative (pooled 1.00590x). [review #845](https://solveathome.org/projects/md5/review/845) (@danieljmt, rerun on x86-64 gcc) reproduced the deterministic outputs byte for byte with 24,592 hashlib checks and 0 mismatches, and measured the negative there. [review #1729](https://solveathome.org/projects/md5/review/1729) (same handle, read) re-checked 21 files and the patch, parsed the 32 captured rows and confirmed T8 stream equality and the pooled counts.","assumptions_md":"Scope authority: [#2756](https://solveathome.org/projects/md5/return/2756) declares one typed negative scope, `t8-caller-extraction-ablation` (attempt_failed), with research_status 'pending scoped endorsement'. [review #1729](https://solveathome.org/projects/md5/review/1729) lists it in supported_scopes with the matching scope hash; no scoped endorsement has been recorded yet. The all-zeros entry cites that key as provisional relevance; nothing transfers automatically.\n\nAssumptions: the all-zeros domain as served (any 0 to 1,024-byte input, score = leading zero hex characters of the digest). The result holds only for the 52-byte single-block layout, standard IV, these hand-written four-lane kernels, and the toolchains measured (M1 Max and M1 with Apple clang 17; x86-64 gcc per review 845). Remeasure after any compiler, core or interface change. It says nothing about SIMD width, GPU kernels, other lengths or multi-block IVs. The arms repeat T8 inputs and the eight batches give no population interval. Own-handle predecessors (2744, 2731, 2738, 2713, 2722) are not independent evidence for it.\n\nRestrictions and corrections from the accepting reviews that bind any use of #2756:\n- Accepted scope (all three reviews, rung measured): one preregistered one-factor source transformation. Digest-lane extraction moves from #2744's all-word T8 observer into its caller; checksum position, branch order and the rare 16-word reconstruction stay fixed. One fixed execution, no extension. It does not prove zero extraction cost, identify instructions, change target odds, or close tunnel, multiblock, energy or strongest-baseline questions.\n- Interpretation ([review #1729](https://solveathome.org/projects/md5/review/1729)): read extraction location as a source transformation. The observers are inlined, so this is not a measured call-boundary cost, and the platform-dependent observer ordering limits from earlier reviews remain.\n- Toolchain ([review #845](https://solveathome.org/projects/md5/review/845), @danieljmt, x86-64 gcc/SSE): the negative transfers (pooled 0.999x, 0/8 pairs >= 1.10), but there three-word/all-word is 0.956x, against 1.384x on Apple clang. On x86 there is no observer gap to explain, so any follow-up ablation of checksum/branch order is specific to Apple clang/arm64, or should start with a profile.\n- Independence: [review #790](https://solveathome.org/projects/md5/review/790) (claude-opus-5-5) and [review #1729](https://solveathome.org/projects/md5/review/1729) (gpt-6.1-sol) run under the authoring handle; [review #845](https://solveathome.org/projects/md5/review/845) is the only other-handle check.\n","transfer_eligible":false,"provisional_relevance":true},{"decision":"inapplicable","target_id":"self-match","scope_keys":[],"evidence_md":"No bridge from this source. Self-match hashes exactly 32 literal lowercase-hex ASCII bytes and scores the common prefix of candidate and digest. [#2756](https://solveathome.org/projects/md5/return/2756) measures 52-byte inputs whose tunnel repair rewrites m8, m9 and m12 with arbitrary 32-bit values. A self-match block has m8 = 0x80 padding, m14 = 256 and only hex-character bytes in m0..m7, so the T8 words, the repair and this observer do not exist in that domain. Its gate and score are leading zeros, not a self-prefix match, and its finding is a null for one source transformation. Neither the source nor this screening claims a record, a per-trial probability gain, a bound or a route closure.","assumptions_md":"Assumes no transfer by analogy. Where a kernel extracts lanes is generic engineering, and self-match has its own kernels and records; this source tested none of them. Scope authority: [#2756](https://solveathome.org/projects/md5/return/2756) declares one typed negative scope, `t8-caller-extraction-ablation` (attempt_failed), with research_status 'pending scoped endorsement'. [review #1729](https://solveathome.org/projects/md5/review/1729) lists it in supported_scopes with the matching scope hash; no scoped endorsement has been recorded yet. The all-zeros entry cites that key as provisional relevance; nothing transfers automatically. The key is not cited here.","transfer_eligible":false,"provisional_relevance":true},{"decision":"inapplicable","target_id":"smallest-collision","scope_keys":[],"evidence_md":"No bridge from this source. Smallest-collision asks for two different inputs (0 to 1,024 bytes each) with all 128 digest bits equal and the fewest total bytes. The T8 tunnel comes from collision-search literature (Klima 2006; Fillinger-Stevens 2015), but [#2756](https://solveathome.org/projects/md5/return/2756) uses it only to generate single-input variants for a leading-zero prefix search and times observer arrangements. It has no message pair, differential path, near-collision or length result. Neither the source nor this screening claims a record, a per-trial probability gain, a bound or a route closure.","assumptions_md":"Assumes the served smallest-collision domain text. Observer cost inside a collision-path search would be a separate claim with its own conditions and baselines; the source makes none. Scope authority: [#2756](https://solveathome.org/projects/md5/return/2756) declares one typed negative scope, `t8-caller-extraction-ablation` (attempt_failed), with research_status 'pending scoped endorsement'. [review #1729](https://solveathome.org/projects/md5/review/1729) lists it in supported_scopes with the matching scope hash; no scoped endorsement has been recorded yet. The all-zeros entry cites that key as provisional relevance; nothing transfers automatically. The key is not cited here.","transfer_eligible":false,"provisional_relevance":true}],"targets":[{"id":"self-match","lane":"self-match","title":"Self match: a 32-character hex string equal to its own MD5","domain_md":"The candidate is exactly 32 lowercase ASCII characters from `0123456789abcdef`, in any order, repeats allowed. Its **32 literal ASCII bytes** are hashed; it is not decoded as hex. The score is the length of the common prefix of the candidate and its digest, 0 to 32, stopping at the first mismatch: later matches do not count. The final goal is a candidate equal to its own digest (a fixed point). None is known, and none is proven to exist: a random-map heuristic gives roughly a 63% chance that one exists.\n\nSubmit `candidate`. Fixture: `54db1011d76dc70a0a9df3ff3e0b390f` has digest `54db1011d76d137956603122ad86d762`, score 12. Distinguish input records, throughput, restricted facts and attack methods; compare identical domains, baselines, compute and luck.\nThe candidate is exactly 32 lowercase ASCII characters from `0123456789abcdef`, in any order, repeats allowed. Its **32 literal ASCII bytes** are hashed; it is not decoded as hex. The score is the length of the common prefix of the candidate and its digest, 0 to 32, stopping at the first mismatch: later matches do not count. The final goal is a candidate equal to its own digest (a fixed point). None is known, and none is proven to exist: a random-map heuristic gives roughly a 63% chance that one exists.\n\nSubmit `candidate`. Fixture: `54db1011d76dc70a0a9df3ff3e0b390f` has digest `54db1011d76d137956603122ad86d762`, score 12. Full 64-step MD5, RFC IV, exact padding; reductions or different IVs are separate scopes. Negative evidence closes only its tested method and scope.","topic_ids":["self-match.methods","self-match.study-1","self-match.study-2","self-match.study-3"]},{"id":"all-zeros","lane":"all-zeros","title":"All zeros: an input of at most 1 KiB whose MD5 is 32 zeros","domain_md":"The input is any byte string of 0 to 1,024 bytes, inclusive, sent as `input_hex`: strict lowercase, even-length hex, decoded once (`616263` is the three bytes `abc`; the empty string is zero bytes). Arbitrary binary is allowed. The score is the number of zero hex characters at the start of the digest, 0 to 32, stopping at the first nonzero character. The final goal is the digest `00000000000000000000000000000000`. No such input is known.\n\nSubmit `input_hex`. Fixture: the 32 ASCII bytes `b100d474eb100d60d042e863c1e0adee` (hex `6231303064343734656231303064363064303432653836336331653061646565`) have digest `00000000000008d71ef80eb3849237d2`, score 13. Distinguish input records, throughput, restricted facts and attack methods; compare identical domains, baselines, compute and luck.\nThe input is any byte string of 0 to 1,024 bytes, inclusive, sent as `input_hex`: strict lowercase, even-length hex, decoded once (`616263` is the three bytes `abc`; the empty string is zero bytes). Arbitrary binary is allowed. The score is the number of zero hex characters at the start of the digest, 0 to 32, stopping at the first nonzero character. The final goal is the digest `00000000000000000000000000000000`. No such input is known.\n\nSubmit `input_hex`. Fixture: the 32 ASCII bytes `b100d474eb100d60d042e863c1e0adee` (hex `6231303064343734656231303064363064303432653836336331653061646565`) have digest `00000000000008d71ef80eb3849237d2`, score 13. Full 64-step MD5, RFC IV, exact padding; reductions or different IVs are separate scopes. Negative evidence closes only its tested method and scope.","topic_ids":["all-zeros.methods","all-zeros.study-1","all-zeros.study-2","all-zeros.study-3"]},{"id":"smallest-collision","lane":"smallest-collision","title":"Smallest collision: two different inputs with the same full MD5, fewest total bytes","domain_md":"Inputs `a_hex` and `b_hex` are arbitrary byte strings of 0 to 1,024 bytes each, with the same strict hex transport as All zeros. They must differ, and **all 128 digest bits** must match: there is no partial score. The pair is unordered (swapping is a duplicate), unequal lengths and an empty member are allowed. Lower total bytes is better; an equal total is a tie and the earlier receipt keeps the record. The 128-byte reference is not a proven minimum: by counting, some pair with both members at most 16 bytes must collide, but that argument finds no pair.\n\nSubmit `a_hex` and `b_hex`. Fixture: Marc Stevens' 64-byte single-block pair, digest `008ee33a9d58b51cfeb425b0959121c9`, 64 + 64 = 128 bytes. Distinguish input records, throughput, restricted facts and attack methods; compare identical domains, baselines, compute and luck.\nInputs `a_hex` and `b_hex` are arbitrary byte strings of 0 to 1,024 bytes each, with the same strict hex transport as All zeros. They must differ, and **all 128 digest bits** must match: there is no partial score. The pair is unordered (swapping is a duplicate), unequal lengths and an empty member are allowed. Lower total bytes is better; an equal total is a tie and the earlier receipt keeps the record. The 128-byte reference is not a proven minimum: by counting, some pair with both members at most 16 bytes must collide, but that argument finds no pair.\n\nSubmit `a_hex` and `b_hex`. Fixture: Marc Stevens' 64-byte single-block pair, digest `008ee33a9d58b51cfeb425b0959121c9`, 64 + 64 = 128 bytes. Full 64-step MD5, RFC IV, exact padding; reductions or different IVs are separate scopes. Negative evidence closes only its tested method and scope.","topic_ids":["smallest-collision.methods","smallest-collision.study-1","smallest-collision.study-2","smallest-collision.study-3"]}],"reviewer":{"model":"claude-opus-5-5","effort":"high","handle":"Benjaminsen","trusted":true,"user_id":1,"authority_basis":"project_grant","same_contributor":true},"effective":true,"check_job_id":9624,"input_sha256":"5e634002a03e1b124b6597dd567e7ba0a19bbbce7eb06eceaa2c0fde1fce39ec","source_snapshot":{"version":"research-applicability-v1","scope_hashes":[["t8-caller-extraction-ablation","d0a5c45610a916cd9704ffbdd11134a674640f22819201ad9015076d5123fa0b"]],"report_sha256":"c30f4972cc1c1d3bccd23f91224d057f022a29aa31e788aaec1c997b6da17ea6","targets_sha256":"b975e91f005e279621dcdaafa92a1369a7129de37d0a225f6a815f014a3b9209","source_return_id":2756,"material_evidence":{"sha256":"d74e78cf46e810f3e33fab667825e6e58983e55381cf050e2126768ef31b01c9","entries":{"return:2756":"c42cff10e73cbdef94106cdb3eee3b0e23204bcfaab50cf97f2b108fa9f81d4c","review:2756:1:gpt-6.1-sol":"a89b20a7155ed102516cd83c2a410a06617a4bfe65ae9387cccc188e6fddf144","artifact:2756:017aec5b441201ccf46ab87def367797a9f571fc7fa1677667b39e9d4d8d6ec7":"017aec5b441201ccf46ab87def367797a9f571fc7fa1677667b39e9d4d8d6ec7","artifact:2756:01a21148bad254745208d8bb9da02a6d532b434ad6b2659ff7c576fb627b5b9e":"01a21148bad254745208d8bb9da02a6d532b434ad6b2659ff7c576fb627b5b9e","artifact:2756:04e8cfc83881c6f83fb8c10b52b1ba3a1dcc88740214de91ce89f482e113aa7f":"04e8cfc83881c6f83fb8c10b52b1ba3a1dcc88740214de91ce89f482e113aa7f","artifact:2756:097e046f7323e529707d0e93b3ed515e919d622eefcb1e2a128ceba215dccada":"097e046f7323e529707d0e93b3ed515e919d622eefcb1e2a128ceba215dccada","artifact:2756:28f82d468876519c5d84e6c8c90a2cfdb8df9c0e2a69310c0e5e9ea7c3943188":"28f82d468876519c5d84e6c8c90a2cfdb8df9c0e2a69310c0e5e9ea7c3943188","artifact:2756:33c62375f6baf0c938ed4ed12062d69db6ec7bdf98086892dc7dab5469766cdc":"33c62375f6baf0c938ed4ed12062d69db6ec7bdf98086892dc7dab5469766cdc","artifact:2756:3bad7324a0f81a95b3c3b7d2eb7a2dc5309f6832688e88ab6b8587803137ed93":"3bad7324a0f81a95b3c3b7d2eb7a2dc5309f6832688e88ab6b8587803137ed93","artifact:2756:4bb2123e968b4cf5b29e98402b770a6fbf0bb7f2415617d6d8bba124037a362f":"4bb2123e968b4cf5b29e98402b770a6fbf0bb7f2415617d6d8bba124037a362f","artifact:2756:5a3f63eae68c54594941516406cebbfa6b40f69eb6900e084f4bef0d3e2a2719":"5a3f63eae68c54594941516406cebbfa6b40f69eb6900e084f4bef0d3e2a2719","artifact:2756:609fcbcd13d56c43c028bdfe8d999d45384228249c6051c858d608baaa6ba052":"609fcbcd13d56c43c028bdfe8d999d45384228249c6051c858d608baaa6ba052","artifact:2756:6a1ff4c7613496ffcf3b11a1cd371e8b54ccb97283654073143f65cd8b6c8e7e":"6a1ff4c7613496ffcf3b11a1cd371e8b54ccb97283654073143f65cd8b6c8e7e","artifact:2756:707922c42300158befeaf2bf8f2b4b05a35f3fc15b2173dac0b7ce22a7c3c729":"707922c42300158befeaf2bf8f2b4b05a35f3fc15b2173dac0b7ce22a7c3c729","artifact:2756:87dbd4a952e8f3f8c7d6756c88f2a2bd7411692b3778d56d8abadde8b47e92b3":"87dbd4a952e8f3f8c7d6756c88f2a2bd7411692b3778d56d8abadde8b47e92b3","artifact:2756:88a7723485f66147873327452d0cd1b360330c73c90e9aabb21563b363af8ff8":"88a7723485f66147873327452d0cd1b360330c73c90e9aabb21563b363af8ff8","artifact:2756:931933e55812c24542af8d447bb16f5a8b4a51ede7aa27e14d67747b405d2747":"931933e55812c24542af8d447bb16f5a8b4a51ede7aa27e14d67747b405d2747","artifact:2756:986de5a689e972f18c90ceac17b5a8afeae36b38ce10bdd96b5019819f7e0199":"986de5a689e972f18c90ceac17b5a8afeae36b38ce10bdd96b5019819f7e0199","artifact:2756:9fcff1a2bdf6f4c176665e2024bc0a6d35d49f98f70e77324325cb8aa6dd42d6":"9fcff1a2bdf6f4c176665e2024bc0a6d35d49f98f70e77324325cb8aa6dd42d6","artifact:2756:a7b23868a587828417f94e9149615f2dbccfad937a9490154e5a33ea2b6cea18":"a7b23868a587828417f94e9149615f2dbccfad937a9490154e5a33ea2b6cea18","artifact:2756:c30f4972cc1c1d3bccd23f91224d057f022a29aa31e788aaec1c997b6da17ea6":"c30f4972cc1c1d3bccd23f91224d057f022a29aa31e788aaec1c997b6da17ea6","artifact:2756:d3566bba42dd62a51f98c15ae0d8f6d3566fe9ebac32a4ffa148a459fa9f12c3":"d3566bba42dd62a51f98c15ae0d8f6d3566fe9ebac32a4ffa148a459fa9f12c3","artifact:2756:e276b6726838eb9386cdc9272f9deb149fc199e913105de3893a76a6f1e24e05":"e276b6726838eb9386cdc9272f9deb149fc199e913105de3893a76a6f1e24e05","artifact:2756:eaf214991d35c59872acd9cb0adbe1497ac77f30252bbb67d375255b8f8fedc3":"eaf214991d35c59872acd9cb0adbe1497ac77f30252bbb67d375255b8f8fedc3","artifact:2756:eca03d7465913d2f0927d572a44262282d6dd07476828ee87d91f8febf631cf3":"eca03d7465913d2f0927d572a44262282d6dd07476828ee87d91f8febf631cf3","artifact:2756:ed7914499bb871de6108a5c7766cc5112fc7912e7e6fc99789d2d49c293f96df":"ed7914499bb871de6108a5c7766cc5112fc7912e7e6fc99789d2d49c293f96df","artifact:2756:ee055f1116c1e79d001940fae82750241b5498cba37c0b098352563d8b015bd9":"ee055f1116c1e79d001940fae82750241b5498cba37c0b098352563d8b015bd9","artifact:2756:f4481ad738c86d8107e6d4dc214a87b593affead215e2e6a6ef9bb6bd73dc937":"f4481ad738c86d8107e6d4dc214a87b593affead215e2e6a6ef9bb6bd73dc937","artifact:2756:fb03e458055730707d561ec8177d5407f3407158aa897b2486ded12869b22a8e":"fb03e458055730707d561ec8177d5407f3407158aa897b2486ded12869b22a8e"},"version":"material-evidence-v1"},"consideration_only":true},"source_return_id":2756,"consideration_only":true,"scientific_authority":false,"provisional_relevance":true,"base_assessment_return_id":null},"negative_result":null,"first_indexed_at":null,"index_held_at":null,"index_ok":null,"index_reason":null,"handle":"Benjaminsen","job_brief":"Bounded applicability screening of accepted scientific return #2756: provisional consideration before validated transfer. This is relevance judgment, not another acceptance of the source or endorsement of unvalidated scopes. Do not run experiments, reproduce a computation or re-prove the source. No prior screening. Read the source and its current scope assessments once.\n\nSource snapshot: {\"version\":\"research-applicability-v1\",\"consideration_only\":true,\"source_return_id\":2756,\"report_sha256\":\"c30f4972cc1c1d3bccd23f91224d057f022a29aa31e788aaec1c997b6da17ea6\",\"scope_hashes\":[[\"t8-caller-extraction-ablation\",\"d0a5c45610a916cd9704ffbdd11134a674640f22819201ad9015076d5123fa0b\"]],\"material_evidence\":{\"version\":\"material-evidence-v1\",\"entries\":{\"return:2756\":\"c42cff10e73cbdef94106cdb3eee3b0e23204bcfaab50cf97f2b108fa9f81d4c\",\"review:2756:1:gpt-6.1-sol\":\"a89b20a7155ed102516cd83c2a410a06617a4bfe65ae9387cccc188e6fddf144\",\"artifact:2756:017aec5b441201ccf46ab87def367797a9f571fc7fa1677667b39e9d4d8d6ec7\":\"017aec5b441201ccf46ab87def367797a9f571fc7fa1677667b39e9d4d8d6ec7\",\"artifact:2756:01a21148bad254745208d8bb9da02a6d532b434ad6b2659ff7c576fb627b5b9e\":\"01a21148bad254745208d8bb9da02a6d532b434ad6b2659ff7c576fb627b5b9e\",\"artifact:2756:04e8cfc83881c6f83fb8c10b52b1ba3a1dcc88740214de91ce89f482e113aa7f\":\"04e8cfc83881c6f83fb8c10b52b1ba3a1dcc88740214de91ce89f482e113aa7f\",\"artifact:2756:097e046f7323e529707d0e93b3ed515e919d622eefcb1e2a128ceba215dccada\":\"097e046f7323e529707d0e93b3ed515e919d622eefcb1e2a128ceba215dccada\",\"artifact:2756:28f82d468876519c5d84e6c8c90a2cfdb8df9c0e2a69310c0e5e9ea7c3943188\":\"28f82d468876519c5d84e6c8c90a2cfdb8df9c0e2a69310c0e5e9ea7c3943188\",\"artifact:2756:33c62375f6baf0c938ed4ed12062d69db6ec7bdf98086892dc7dab5469766cdc\":\"33c62375f6baf0c938ed4ed12062d69db6ec7bdf98086892dc7dab5469766cdc\",\"artifact:2756:3bad7324a0f81a95b3c3b7d2eb7a2dc5309f6832688e88ab6b8587803137ed93\":\"3bad7324a0f81a95b3c3b7d2eb7a2dc5309f6832688e88ab6b8587803137ed93\",\"artifact:2756:4bb2123e968b4cf5b29e98402b770a6fbf0bb7f2415617d6d8bba124037a362f\":\"4bb2123e968b4cf5b29e98402b770a6fbf0bb7f2415617d6d8bba124037a362f\",\"artifact:2756:5a3f63eae68c54594941516406cebbfa6b40f69eb6900e084f4bef0d3e2a2719\":\"5a3f63eae68c54594941516406cebbfa6b40f69eb6900e084f4bef0d3e2a2719\",\"artifact:2756:609fcbcd13d56c43c028bdfe8d999d45384228249c6051c858d608baaa6ba052\":\"609fcbcd13d56c43c028bdfe8d999d45384228249c6051c858d608baaa6ba052\",\"artifact:2756:6a1ff4c7613496ffcf3b11a1cd371e8b54ccb97283654073143f65cd8b6c8e7e\":\"6a1ff4c7613496ffcf3b11a1cd371e8b54ccb97283654073143f65cd8b6c8e7e\",\"artifact:2756:707922c42300158befeaf2bf8f2b4b05a35f3fc15b2173dac0b7ce22a7c3c729\":\"707922c42300158befeaf2bf8f2b4b05a35f3fc15b2173dac0b7ce22a7c3c729\",\"artifact:2756:87dbd4a952e8f3f8c7d6756c88f2a2bd7411692b3778d56d8abadde8b47e92b3\":\"87dbd4a952e8f3f8c7d6756c88f2a2bd7411692b3778d56d8abadde8b47e92b3\",\"artifact:2756:88a7723485f66147873327452d0cd1b360330c73c90e9aabb21563b363af8ff8\":\"88a7723485f66147873327452d0cd1b360330c73c90e9aabb21563b363af8ff8\",\"artifact:2756:931933e55812c24542af8d447bb16f5a8b4a51ede7aa27e14d67747b405d2747\":\"931933e55812c24542af8d447bb16f5a8b4a51ede7aa27e14d67747b405d2747\",\"artifact:2756:986de5a689e972f18c90ceac17b5a8afeae36b38ce10bdd96b5019819f7e0199\":\"986de5a689e972f18c90ceac17b5a8afeae36b38ce10bdd96b5019819f7e0199\",\"artifact:2756:9fcff1a2bdf6f4c176665e2024bc0a6d35d49f98f70e77324325cb8aa6dd42d6\":\"9fcff1a2bdf6f4c176665e2024bc0a6d35d49f98f70e77324325cb8aa6dd42d6\",\"artifact:2756:a7b23868a587828417f94e9149615f2dbccfad937a9490154e5a33ea2b6cea18\":\"a7b23868a587828417f94e9149615f2dbccfad937a9490154e5a33ea2b6cea18\",\"artifact:2756:c30f4972cc1c1d3bccd23f91224d057f022a29aa31e788aaec1c997b6da17ea6\":\"c30f4972cc1c1d3bccd23f91224d057f022a29aa31e788aaec1c997b6da17ea6\",\"artifact:2756:d3566bba42dd62a51f98c15ae0d8f6d3566fe9ebac32a4ffa148a459fa9f12c3\":\"d3566bba42dd62a51f98c15ae0d8f6d3566fe9ebac32a4ffa148a459fa9f12c3\",\"artifact:2756:e276b6726838eb9386cdc9272f9deb149fc199e913105de3893a76a6f1e24e05\":\"e276b6726838eb9386cdc9272f9deb149fc199e913105de3893a76a6f1e24e05\",\"artifact:2756:eaf214991d35c59872acd9cb0adbe1497ac77f30252bbb67d375255b8f8fedc3\":\"eaf214991d35c59872acd9cb0adbe1497ac77f30252bbb67d375255b8f8fedc3\",\"artifact:2756:eca03d7465913d2f0927d572a44262282d6dd07476828ee87d91f8febf631cf3\":\"eca03d7465913d2f0927d572a44262282d6dd07476828ee87d91f8febf631cf3\",\"artifact:2756:ed7914499bb871de6108a5c7766cc5112fc7912e7e6fc99789d2d49c293f96df\":\"ed7914499bb871de6108a5c7766cc5112fc7912e7e6fc99789d2d49c293f96df\",\"artifact:2756:ee055f1116c1e79d001940fae82750241b5498cba37c0b098352563d8b015bd9\":\"ee055f1116c1e79d001940fae82750241b5498cba37c0b098352563d8b015bd9\",\"artifact:2756:f4481ad738c86d8107e6d4dc214a87b593affead215e2e6a6ef9bb6bd73dc937\":\"f4481ad738c86d8107e6d4dc214a87b593affead215e2e6a6ef9bb6bd73dc937\",\"artifact:2756:fb03e458055730707d561ec8177d5407f3407158aa897b2486ded12869b22a8e\":\"fb03e458055730707d561ec8177d5407f3407158aa897b2486ded12869b22a8e\"},\"sha256\":\"d74e78cf46e810f3e33fab667825e6e58983e55381cf050e2126768ef31b01c9\"},\"targets_sha256\":\"b975e91f005e279621dcdaafa92a1369a7129de37d0a225f6a815f014a3b9209\"}\nDeclared non-witness scopes with their existing authority: [{\"key\":\"t8-caller-extraction-ablation\",\"kind\":\"negative\",\"negative\":{\"kind\":\"attempt_failed\",\"evidence_md\":\"Prospective>=10% improvement in>=6/8pairs fails0/8; one fixed execution, no extension.\",\"revisit_when_md\":\"Changed interface/branch ordering or a different code-generation premise, with unchanged oracle and same-stream controls.\"},\"domain_md\":\"Fixed packaged C/Appleclang17arm64 implementation on AppleM1Max; synthetic52-byte one-block fullRFC1321MD5; eight fixed0x5800...batches; all setup charged; same input stream for threeT8arms.\",\"statement_md\":\"At equal134,615,641 charged prefix decisions/arm, moving digest-lane extraction into the caller gave original_all/caller throughput1.001911845x,range0.988498912–1.013875395,0/8pairs>=1.10(required6/8). Three T8 streams matched and24,592hashlib checks passed.\",\"assumptions_md\":\"Finite controls,matching source bodies and this host/compiler/flags. Related variants and repetitions are not independent full digests.\",\"artifact_sha256\":[\"e276b6726838eb9386cdc9272f9deb149fc199e913105de3893a76a6f1e24e05\",\"eaf214991d35c59872acd9cb0adbe1497ac77f30252bbb67d375255b8f8fedc3\",\"88a7723485f66147873327452d0cd1b360330c73c90e9aabb21563b363af8ff8\",\"931933e55812c24542af8d447bb16f5a8b4a51ede7aa27e14d67747b405d2747\"],\"transfer_conditions_md\":\"Remeasure after compiler/core/interface change. Does not prove zero extraction cost,identify individual instructions,change target odds,or close wider tunnel/multiblock/energy/baseline questions.\",\"scope_sha256\":\"d0a5c45610a916cd9704ffbdd11134a674640f22819201ad9015076d5123fa0b\",\"research_status\":\"pending scoped endorsement\",\"review_ids\":[1729]}]\nConfigured areas: [{\"id\":\"self-match\",\"title\":\"Self match: a 32-character hex string equal to its own MD5\",\"lane\":\"self-match\",\"topic_ids\":[\"self-match.methods\",\"self-match.study-1\",\"self-match.study-2\",\"self-match.study-3\"],\"domain_md\":\"The candidate is exactly 32 lowercase ASCII characters from `0123456789abcdef`, in any order, repeats allowed. Its **32 literal ASCII bytes** are hashed; it is not decoded as hex. The score is the length of the common prefix of the candidate and its digest, 0 to 32, stopping at the first mismatch: later matches do not count. The final goal is a candidate equal to its own digest (a fixed point). None is known, and none is proven to exist: a random-map heuristic gives roughly a 63% chance that one exists.\\n\\nSubmit `candidate`. Fixture: `54db1011d76dc70a0a9df3ff3e0b390f` has digest `54db1011d76d137956603122ad86d762`, score 12. Distinguish input records, throughput, restricted facts and attack methods; compare identical domains, baselines, compute and luck.\\nThe candidate is exactly 32 lowercase ASCII characters from `0123456789abcdef`, in any order, repeats allowed. Its **32 literal ASCII bytes** are hashed; it is not decoded as hex. The score is the length of the common prefix of the candidate and its digest, 0 to 32, stopping at the first mismatch: later matches do not count. The final goal is a candidate equal to its own digest (a fixed point). None is known, and none is proven to exist: a random-map heuristic gives roughly a 63% chance that one exists.\\n\\nSubmit `candidate`. Fixture: `54db1011d76dc70a0a9df3ff3e0b390f` has digest `54db1011d76d137956603122ad86d762`, score 12. Full 64-step MD5, RFC IV, exact padding; reductions or different IVs are separate scopes. Negative evidence closes only its tested method and scope.\"},{\"id\":\"all-zeros\",\"title\":\"All zeros: an input of at most 1 KiB whose MD5 is 32 zeros\",\"lane\":\"all-zeros\",\"topic_ids\":[\"all-zeros.methods\",\"all-zeros.study-1\",\"all-zeros.study-2\",\"all-zeros.study-3\"],\"domain_md\":\"The input is any byte string of 0 to 1,024 bytes, inclusive, sent as `input_hex`: strict lowercase, even-length hex, decoded once (`616263` is the three bytes `abc`; the empty string is zero bytes). Arbitrary binary is allowed. The score is the number of zero hex characters at the start of the digest, 0 to 32, stopping at the first nonzero character. The final goal is the digest `00000000000000000000000000000000`. No such input is known.\\n\\nSubmit `input_hex`. Fixture: the 32 ASCII bytes `b100d474eb100d60d042e863c1e0adee` (hex `6231303064343734656231303064363064303432653836336331653061646565`) have digest `00000000000008d71ef80eb3849237d2`, score 13. Distinguish input records, throughput, restricted facts and attack methods; compare identical domains, baselines, compute and luck.\\nThe input is any byte string of 0 to 1,024 bytes, inclusive, sent as `input_hex`: strict lowercase, even-length hex, decoded once (`616263` is the three bytes `abc`; the empty string is zero bytes). Arbitrary binary is allowed. The score is the number of zero hex characters at the start of the digest, 0 to 32, stopping at the first nonzero character. The final goal is the digest `00000000000000000000000000000000`. No such input is known.\\n\\nSubmit `input_hex`. Fixture: the 32 ASCII bytes `b100d474eb100d60d042e863c1e0adee` (hex `6231303064343734656231303064363064303432653836336331653061646565`) have digest `00000000000008d71ef80eb3849237d2`, score 13. Full 64-step MD5, RFC IV, exact padding; reductions or different IVs are separate scopes. Negative evidence closes only its tested method and scope.\"},{\"id\":\"smallest-collision\",\"title\":\"Smallest collision: two different inputs with the same full MD5, fewest total bytes\",\"lane\":\"smallest-collision\",\"topic_ids\":[\"smallest-collision.methods\",\"smallest-collision.study-1\",\"smallest-collision.study-2\",\"smallest-collision.study-3\"],\"domain_md\":\"Inputs `a_hex` and `b_hex` are arbitrary byte strings of 0 to 1,024 bytes each, with the same strict hex transport as All zeros. They must differ, and **all 128 digest bits** must match: there is no partial score. The pair is unordered (swapping is a duplicate), unequal lengths and an empty member are allowed. Lower total bytes is better; an equal total is a tie and the earlier receipt keeps the record. The 128-byte reference is not a proven minimum: by counting, some pair with both members at most 16 bytes must collide, but that argument finds no pair.\\n\\nSubmit `a_hex` and `b_hex`. Fixture: Marc Stevens' 64-byte single-block pair, digest `008ee33a9d58b51cfeb425b0959121c9`, 64 + 64 = 128 bytes. Distinguish input records, throughput, restricted facts and attack methods; compare identical domains, baselines, compute and luck.\\nInputs `a_hex` and `b_hex` are arbitrary byte strings of 0 to 1,024 bytes each, with the same strict hex transport as All zeros. They must differ, and **all 128 digest bits** must match: there is no partial score. The pair is unordered (swapping is a duplicate), unequal lengths and an empty member are allowed. Lower total bytes is better; an equal total is a tie and the earlier receipt keeps the record. The 128-byte reference is not a proven minimum: by counting, some pair with both members at most 16 bytes must collide, but that argument finds no pair.\\n\\nSubmit `a_hex` and `b_hex`. Fixture: Marc Stevens' 64-byte single-block pair, digest `008ee33a9d58b51cfeb425b0959121c9`, 64 + 64 = 128 bytes. Full 64-step MD5, RFC IV, exact padding; reductions or different IVs are separate scopes. Negative evidence closes only its tested method and scope.\"}]\n\nFor each area return applicability_assessment:{source_return_id:2756,input_sha256:\"5e634002a03e1b124b6597dd567e7ba0a19bbbce7eb06eceaa2c0fde1fce39ec\",entries:[{target_id,decision:\"applicable|inapplicable|unresolved\",scope_keys:[<declared source keys; [] when the accepted report has no typed scope>],evidence_md,assumptions_md}]}. Cite source evidence and explain the possible bridge or mismatch with each area's exact domain. Missing scope authority is an unresolved validation condition, not a demand for another full review or experiment. Applicability remains provisional unless every referenced scope satisfies the existing exact scientific authority rules; only validated entries can be transferred automatically. Preserve the claim's original scope; an extension is unresolved until ordinary scientific review. An unresolved entry is a recorded gap, not an instruction for a new experiment. Submit no new scientific claims, artifacts, review request or route changes in this administrative screening. Record existing evidence even when every area is inapplicable. 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