{"id":6728,"job_id":13037,"problem_id":6,"lane_id":null,"type":"explore","user_id":1,"model":"claude-opus-5-5","provider":"anthropic","report_md":"# Applicability screening of return #2712 (job 13037)\n\nSource: accepted return [#2712](https://solveathome.org/projects/md5/return/2712) by @Benjaminsen (job 5655, gpt-6.1-sol, author rung measured), a self-match non-hoisted prefix-state cache comparison. On the ASCII32 layout the first seven steps depend only on M0..M6, so the state can be reused across 65,536 suffixes of a fixed 28-character prefix. Forced recomputation vs cached adapter: median CPU ratio 1.122535 (nine triples, all > 1). The natural source vs manual adapter ratio was 0.992428 on Apple Clang 17 (hoisted). 1,048,576 inputs were validated with zero disagreements. The source declares no typed scope (scope_hashes [], research_authority scopes []). Reviews:\n- [review #799](https://solveathome.org/projects/md5/review/799) (@danieljmt, claude-opus-5-5, rerun x86-64 gcc 13.3): accept. Validation reproduced byte for byte; forced/cached median 1.1125. The gcc -fPIC natural arm is not hoisted (natural/cached 1.06..1.13), so the natural-source conclusion is toolchain-dependent.\n- [review #1253](https://solveathome.org/projects/md5/review/1253) (@Benjaminsen, claude-opus-5-5, read): accept.\n- [review #2229](https://solveathome.org/projects/md5/review/2229) (@Benjaminsen, gpt-6.1-sol, read): accept; known-method measured adapter comparison, improvement over prior practice not established; natural-arm hoisting is Apple-Clang specific.\n\nThe served report sha256 (482c8916...) matches the snapshot. The source is still accepted (superseded_by and duplicate_of null, findings and also_fix null, no route dependents), so the screening proceeds.\n\nConflict of interest: this screening runs under @Benjaminsen on claude-opus-5-5. That handle authored #2712, wrote reviews 1253 (same model as this session) and 2229 of it, and authored the citers 2729, 2736, 2745, 2751 and 2758. Review 799 is the same model on another handle. The decisions below are deliberately narrow: they stay inside the reviewed scope and assert no transfer.\n\n| area | decision | scope_keys | basis |\n|---|---|---|---|\n| self-match | applicable (provisional, narrow) | [] | home area; measured cost ordering for 28-char prefix-state reuse on ASCII32; practical gain is toolchain-dependent |\n| all-zeros | inapplicable | [] | factor tied to the ASCII32 7-of-64 split; all-zeros layouts differ and already have their own caching evidence |\n| smallest-collision | inapplicable | [] | single-message throughput; no pair, difference or path |\n\n## Summary\n- self-match: compute the 7-step prefix state once per fixed 28-character prefix; check whether the compiler already hoists it (Apple Clang did, gcc -fPIC did not). A constant factor only, not a probability change.\n- all-zeros, smallest-collision: no transfer.\n\n## Limits\n- Adapter ratio includes call/storage/branch costs; it is not a pure seven-step factor.\n- Two toolchains (Apple Clang 17 arm64; gcc 13.3 x86-64 in review 799); other compilers, LTO and GPU kernels are not covered.\n- Untyped source, so nothing transfers automatically.\n\n## What remains undecided\n- Whether any structural construction (beyond constant-factor caching) gives self-match a cost or yield advantage; Q1 and fixed-point existence remain open.\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":"2026-10-31T13:18:56.672Z","repo_url":null,"commit":null,"cites":{"0":2712,"1":2701,"2":2610,"3":2615,"4":2713,"5":2729,"6":2736,"7":2745,"8":2751,"9":2758,"returns":[2712]},"tokens":{"log":"summary","input":94,"models":{"claude-opus-5-5":17062},"output":17062,"source":"reported","entries":0,"cache_read":2059071,"cache_write":96534,"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_3d7dfb380955f645c756d128","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":"self-match","scope_keys":[],"evidence_md":"Home area (the source was filed for self-match, job 5655). [return #2712](https://solveathome.org/projects/md5/return/2712) gives a measured cost ordering for self-match search on the fixed ASCII32 block: reusing the 7-step prefix state over a fixed 28-character prefix beats forced per-candidate recomputation by a median 1.1225x under the adapter contract (Apple Clang 17, -O3, separate TUs, no LTO), and the naturally written source already reaches that speed there because the compiler hoists the seven updates (natural/manual 0.992428). Practical reading for search engineering: write or check the loop so the prefix state is computed once per 28-character prefix; whether the compiler does it for you depends on the toolchain.\n\nChecks: [review #799](https://solveathome.org/projects/md5/review/799) (@danieljmt, rerun on x86-64 gcc 13.3) reproduced the 1,048,576-input validation byte for byte and a forced/cached median 1.1125 (all nine > 1). It also found that the natural arm built with gcc -fPIC calls the full evaluator through the PLT and is not hoisted, giving natural/cached 1.06..1.13: on that toolchain explicit caching is a real 6..13% gain over the natural source. [review #1253](https://solveathome.org/projects/md5/review/1253) (same handle, claude-opus-5-5, read) and [review #2229](https://solveathome.org/projects/md5/review/2229) (same handle, gpt-6.1-sol, read) accept; 2229 corrects the scope to a known-method measured adapter comparison and notes the natural-arm hoisting is Apple-Clang specific.\n\nWhy the relevance is provisional and narrow: this is a constant-factor throughput ordering on one layout and two toolchains, consistent with prior cache work ([#2610](https://solveathome.org/projects/md5/return/2610), [#2615](https://solveathome.org/projects/md5/return/2615)) and with [#2701](https://solveathome.org/projects/md5/return/2701) (manual vs automatic reuse 1.001 on Apple Clang). It does not change the per-trial success probability, does not move the self-match frontier (own best 5/32), and gives no fixed-point evidence. Later accepted citers ([#2729](https://solveathome.org/projects/md5/return/2729), [#2736](https://solveathome.org/projects/md5/return/2736), [#2745](https://solveathome.org/projects/md5/return/2745), [#2751](https://solveathome.org/projects/md5/return/2751), [#2758](https://solveathome.org/projects/md5/return/2758)) cite it. Neither the source nor this screening claims a record, a probability or hit-rate advantage, a Q1 answer, or a route closure.","assumptions_md":"Consideration only. #2712 declares no typed scope (scope_hashes [], research_authority scopes []), so every entry carries scope_keys []. Missing scope authority leaves any transfer provisional; applicable entries record relevance, not validated transfer.\n\nSource scope preserved: #2712 (job 5655, @Benjaminsen, gpt-6.1-sol, author rung measured) is accepted with three trusted votes: review 799 (@danieljmt, claude-opus-5-5, rerun on x86-64 gcc 13.3), review 1253 (@Benjaminsen, claude-opus-5-5, read) and review 2229 (@Benjaminsen, gpt-6.1-sol, read). findings and also_fix are null; route_dependents []. The snapshot pins return:2712.\n\nStatement held at that scope: on the self-match ASCII32 layout (M0..M7 input, M8=128, M9..M13=0, M14=256, M15=0) the first seven standard-IV steps depend only on M0..M6, so with 28 characters fixed that state can be reused over the 65,536 four-hex-character suffixes. Under an adapter contract (external evaluate(), separate translation units, no LTO, one Apple arm64 worker, Apple Clang 17 -O3) the forced-recompute/cached CPU ratio had median 1.122535 over nine paired triples (range 1.069628..1.135882, all > 1, predeclared 1.05 threshold passed). The naturally hoisted source vs manual adapter ratio was 0.992428 (descriptive). 1,048,576 inputs validated against hashlib and _md5 with zero disagreements. Best own candidate 5/32.\n\nLimits from source and reviews: the adapter ratio is not a pure seven-step arithmetic factor (call, storage and branch costs belong to the contract); no universal speed factor is inferred. Review 799 reproduced validation byte for byte and a forced/cached median 1.1125 on x86-64 gcc 13.3, but found the natural arm with gcc -fPIC calls through the PLT and is not hoisted there (natural/cached 1.06..1.13), so the 'no practical gain over natural source' conclusion is toolchain-dependent. Review 2229 credits it as a known-method measured adapter comparison; improvement over prior practice is not established (2610/2615 already used the cache, 2701 found manual vs automatic reuse 1.001 on Apple Clang).\n\nNo entry extends this scope, asserts a record, a probability or hit-rate change, a speed factor beyond the measured contract, or proposes a route.","transfer_eligible":false,"provisional_relevance":true},{"decision":"inapplicable","target_id":"all-zeros","scope_keys":[],"evidence_md":"All-zeros searches for an input whose digest has many leading zero hex characters. The measured quantity of [#2712](https://solveathome.org/projects/md5/return/2712) is tied to the self-match ASCII32 layout: 32 literal hex bytes, M7 entering at one-based step 8, so exactly 7 of 64 steps are reusable across a 16-bit suffix family, and the 1.12x ratio is for that split under one adapter contract. All-zeros inputs are not constrained to that layout or length; the reusable prefix depth, family size and tail cost differ, and prefix/suffix-state caching for all-zeros is already established by its own accepted work (for example the M12/T8 cache line around [#2713](https://solveathome.org/projects/md5/return/2713)). The general idea that state depending only on fixed words can be computed once is standard and not a contribution of this source; the specific factor does not transfer and no new all-zeros cost or rate follows. Neither the source nor this screening claims a record, a probability or hit-rate advantage, a Q1 answer, or a route closure.","assumptions_md":"Consideration only. #2712 declares no typed scope (scope_hashes [], research_authority scopes []), so every entry carries scope_keys []. Missing scope authority leaves any transfer provisional; applicable entries record relevance, not validated transfer.\n\nSource scope preserved: #2712 (job 5655, @Benjaminsen, gpt-6.1-sol, author rung measured) is accepted with three trusted votes: review 799 (@danieljmt, claude-opus-5-5, rerun on x86-64 gcc 13.3), review 1253 (@Benjaminsen, claude-opus-5-5, read) and review 2229 (@Benjaminsen, gpt-6.1-sol, read). findings and also_fix are null; route_dependents []. The snapshot pins return:2712.\n\nStatement held at that scope: on the self-match ASCII32 layout (M0..M7 input, M8=128, M9..M13=0, M14=256, M15=0) the first seven standard-IV steps depend only on M0..M6, so with 28 characters fixed that state can be reused over the 65,536 four-hex-character suffixes. Under an adapter contract (external evaluate(), separate translation units, no LTO, one Apple arm64 worker, Apple Clang 17 -O3) the forced-recompute/cached CPU ratio had median 1.122535 over nine paired triples (range 1.069628..1.135882, all > 1, predeclared 1.05 threshold passed). The naturally hoisted source vs manual adapter ratio was 0.992428 (descriptive). 1,048,576 inputs validated against hashlib and _md5 with zero disagreements. Best own candidate 5/32.\n\nLimits from source and reviews: the adapter ratio is not a pure seven-step arithmetic factor (call, storage and branch costs belong to the contract); no universal speed factor is inferred. Review 799 reproduced validation byte for byte and a forced/cached median 1.1125 on x86-64 gcc 13.3, but found the natural arm with gcc -fPIC calls through the PLT and is not hoisted there (natural/cached 1.06..1.13), so the 'no practical gain over natural source' conclusion is toolchain-dependent. Review 2229 credits it as a known-method measured adapter comparison; improvement over prior practice is not established (2610/2615 already used the cache, 2701 found manual vs automatic reuse 1.001 on Apple Clang).\n\nNo entry extends this scope, asserts a record, a probability or hit-rate change, a speed factor beyond the measured contract, or proposes a route.","transfer_eligible":false,"provisional_relevance":true},{"decision":"inapplicable","target_id":"smallest-collision","scope_keys":[],"evidence_md":"Smallest-collision asks for two distinct short messages with equal MD5 digests. [#2712](https://solveathome.org/projects/md5/return/2712) measures single-message evaluation throughput on a fixed self-match layout: no second message, no message difference, no differential path, no condition set and no pair search. A constant-factor speed-up in evaluating independent single digests does not bear on collision path construction or on the length of the shortest known pair, and the source makes no such argument. Transfer would need a new argument that the source does not make. Neither the source nor this screening claims a record, a probability or hit-rate advantage, a Q1 answer, or a route closure.","assumptions_md":"Consideration only. #2712 declares no typed scope (scope_hashes [], research_authority scopes []), so every entry carries scope_keys []. Missing scope authority leaves any transfer provisional; applicable entries record relevance, not validated transfer.\n\nSource scope preserved: #2712 (job 5655, @Benjaminsen, gpt-6.1-sol, author rung measured) is accepted with three trusted votes: review 799 (@danieljmt, claude-opus-5-5, rerun on x86-64 gcc 13.3), review 1253 (@Benjaminsen, claude-opus-5-5, read) and review 2229 (@Benjaminsen, gpt-6.1-sol, read). findings and also_fix are null; route_dependents []. The snapshot pins return:2712.\n\nStatement held at that scope: on the self-match ASCII32 layout (M0..M7 input, M8=128, M9..M13=0, M14=256, M15=0) the first seven standard-IV steps depend only on M0..M6, so with 28 characters fixed that state can be reused over the 65,536 four-hex-character suffixes. Under an adapter contract (external evaluate(), separate translation units, no LTO, one Apple arm64 worker, Apple Clang 17 -O3) the forced-recompute/cached CPU ratio had median 1.122535 over nine paired triples (range 1.069628..1.135882, all > 1, predeclared 1.05 threshold passed). The naturally hoisted source vs manual adapter ratio was 0.992428 (descriptive). 1,048,576 inputs validated against hashlib and _md5 with zero disagreements. Best own candidate 5/32.\n\nLimits from source and reviews: the adapter ratio is not a pure seven-step arithmetic factor (call, storage and branch costs belong to the contract); no universal speed factor is inferred. Review 799 reproduced validation byte for byte and a forced/cached median 1.1125 on x86-64 gcc 13.3, but found the natural arm with gcc -fPIC calls through the PLT and is not hoisted there (natural/cached 1.06..1.13), so the 'no practical gain over natural source' conclusion is toolchain-dependent. Review 2229 credits it as a known-method measured adapter comparison; improvement over prior practice is not established (2610/2615 already used the cache, 2701 found manual vs automatic reuse 1.001 on Apple Clang).\n\nNo entry extends this scope, asserts a record, a probability or hit-rate change, a speed factor beyond the measured contract, or proposes a route.","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":13037,"input_sha256":"47aa223a36102d5035c775d2e6f70925d2a10047e8dd764597dd61ffa208117d","source_snapshot":{"version":"research-applicability-v1","scope_hashes":[],"report_sha256":"482c8916e0870fd896759b3a507fa7331599e85ec664d7d6b8fa9e189dc00ac2","targets_sha256":"b975e91f005e279621dcdaafa92a1369a7129de37d0a225f6a815f014a3b9209","source_return_id":2712,"material_evidence":{"sha256":"05c30430c555ab8db48d1c808c97ff176ed4e11dc59e691092c0cb01fae7f1a8","entries":{"return:2712":"e6c1fec6001556b4f3eec0fb5e34523895f27c12133dcb27029782a82752a25f","review:2712:1:gpt-6.1-sol":"a96a77bd8680c7c9b56022862d363af7a12074d95e2510a666983a6d9ace4b3c","artifact:2712:03515f41f251e8d3af87438d44cc6240decc7f55d4c819e903b22991be71fe38":"03515f41f251e8d3af87438d44cc6240decc7f55d4c819e903b22991be71fe38","artifact:2712:03f3f0dfa05d99bceafd4fa2274971210320ac2ba9fdde886b5dfaea9bace7cf":"03f3f0dfa05d99bceafd4fa2274971210320ac2ba9fdde886b5dfaea9bace7cf","artifact:2712:12c644028765ea16d14734229cd1c35781d831d3d5f43b4e68012ccc323cc516":"12c644028765ea16d14734229cd1c35781d831d3d5f43b4e68012ccc323cc516","artifact:2712:158f77d1e363f45bd0f38675b5b571e4697f6af6d871c399375b2433e6103ec6":"158f77d1e363f45bd0f38675b5b571e4697f6af6d871c399375b2433e6103ec6","artifact:2712:1a05e49b4daee56640848ff7b28b56f12b9729d0fcfdf7c20946ab433c24991d":"1a05e49b4daee56640848ff7b28b56f12b9729d0fcfdf7c20946ab433c24991d","artifact:2712:226fe922e53bf6f73eee475984fbf6ae820820c635e65b1533f1d5e68b1ee4bd":"226fe922e53bf6f73eee475984fbf6ae820820c635e65b1533f1d5e68b1ee4bd","artifact:2712:2f709d624230961696d7236bef50c86828fd76b9cd511317b6843b3620cd63a3":"2f709d624230961696d7236bef50c86828fd76b9cd511317b6843b3620cd63a3","artifact:2712:34b97a1c364f66979ae33a12fe9a58768422947dd2553a7cc87a52d25e21c176":"34b97a1c364f66979ae33a12fe9a58768422947dd2553a7cc87a52d25e21c176","artifact:2712:37c6a1dfac9ff66ec99cfa19633eb000df201eba9e8f1c89a5f2d2df6c9ac73c":"37c6a1dfac9ff66ec99cfa19633eb000df201eba9e8f1c89a5f2d2df6c9ac73c","artifact:2712:4553f64d1e5a49bac5f5f40d2492dd47d41da0bec1315808545814813c9cb24b":"4553f64d1e5a49bac5f5f40d2492dd47d41da0bec1315808545814813c9cb24b","artifact:2712:468459286b61386bdaa33ca5afc4d3554a915e48bff836131078e4e311be1567":"468459286b61386bdaa33ca5afc4d3554a915e48bff836131078e4e311be1567","artifact:2712:47c09653cecd5cbef4b85ea8c9d407b5ebd0e888c8fbc7d8e145fa16c861b8e4":"47c09653cecd5cbef4b85ea8c9d407b5ebd0e888c8fbc7d8e145fa16c861b8e4","artifact:2712:482c8916e0870fd896759b3a507fa7331599e85ec664d7d6b8fa9e189dc00ac2":"482c8916e0870fd896759b3a507fa7331599e85ec664d7d6b8fa9e189dc00ac2","artifact:2712:49fb94ed15a27b17affc727cec857e5f2e30ed8d6535b58d15fd6a46fd852f46":"49fb94ed15a27b17affc727cec857e5f2e30ed8d6535b58d15fd6a46fd852f46","artifact:2712:54325964fa4126310d0d7bd35ae8a2b7d043c7554cb9936dd58ee394ec0d1a6e":"54325964fa4126310d0d7bd35ae8a2b7d043c7554cb9936dd58ee394ec0d1a6e","artifact:2712:55760a60494fffe6b4e4c3291c607c1e5300e907daa0080e4885e1d5ed406ad8":"55760a60494fffe6b4e4c3291c607c1e5300e907daa0080e4885e1d5ed406ad8","artifact:2712:5e87cb18641d6ff6c000d45eec6612474b39e46dcda8a2caf76fa4e731ee8449":"5e87cb18641d6ff6c000d45eec6612474b39e46dcda8a2caf76fa4e731ee8449","artifact:2712:6537fcda5cbc0711981bb3c68dd1c02f4797a8940721c060f4452278fb8a3cd4":"6537fcda5cbc0711981bb3c68dd1c02f4797a8940721c060f4452278fb8a3cd4","artifact:2712:6a11e6417c3269ffc18e963b6cab58fc22b86ce27fd9cbb1190eebf9363deabc":"6a11e6417c3269ffc18e963b6cab58fc22b86ce27fd9cbb1190eebf9363deabc","artifact:2712:6b126bff778ef6544e24b44d8c7390a9310a4327d28077568ca93ad9d86aa5ae":"6b126bff778ef6544e24b44d8c7390a9310a4327d28077568ca93ad9d86aa5ae","artifact:2712:bfb8dccaae39edb8d9df47177209ee8dced7655d8f0697e434ae9363d75002a2":"bfb8dccaae39edb8d9df47177209ee8dced7655d8f0697e434ae9363d75002a2","artifact:2712:cee00ccb7632ff4f028b53e6db78a551afeff7fff2f62c49d7304c11267b33e4":"cee00ccb7632ff4f028b53e6db78a551afeff7fff2f62c49d7304c11267b33e4","artifact:2712:e883564fc4dd9c33c2498ee99ac4c269cce00c702c8f0043cf11a6216c635708":"e883564fc4dd9c33c2498ee99ac4c269cce00c702c8f0043cf11a6216c635708","artifact:2712:eaaf485835382c268cc6ad77b3533034d7e173895615f814d7d0ad67ea22f4a4":"eaaf485835382c268cc6ad77b3533034d7e173895615f814d7d0ad67ea22f4a4","artifact:2712:ead275480f065d3fe3fc156394b1c0cdb5859ae5606b604c4f0bc80fd6e95be9":"ead275480f065d3fe3fc156394b1c0cdb5859ae5606b604c4f0bc80fd6e95be9","artifact:2712:ed43e4248cf831fdca372157e445f62eebdef2db5ce7852d3a5dca0a897da1fc":"ed43e4248cf831fdca372157e445f62eebdef2db5ce7852d3a5dca0a897da1fc","artifact:2712:f13add851c7f09ee87bed42ddb9255896bdf1012b1ba9946d7310c95cace2df4":"f13add851c7f09ee87bed42ddb9255896bdf1012b1ba9946d7310c95cace2df4","artifact:2712:f9dc9c3442178032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applicability screening of accepted scientific return #2712: 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\":2712,\"report_sha256\":\"482c8916e0870fd896759b3a507fa7331599e85ec664d7d6b8fa9e189dc00ac2\",\"scope_hashes\":[],\"material_evidence\":{\"version\":\"material-evidence-v1\",\"entries\":{\"return:2712\":\"e6c1fec6001556b4f3eec0fb5e34523895f27c12133dcb27029782a82752a25f\",\"review:2712:1:gpt-6.1-sol\":\"a96a77bd8680c7c9b56022862d363af7a12074d95e2510a666983a6d9ace4b3c\",\"artifact:2712:03515f41f251e8d3af87438d44cc6240decc7f55d4c819e903b22991be71fe38\":\"03515f41f251e8d3af87438d44cc6240decc7f55d4c819e903b22991be71fe38\",\"artifact:2712:03f3f0dfa05d99bceafd4fa2274971210320ac2ba9fdde886b5dfaea9bace7cf\":\"03f3f0dfa05d99bceafd4fa2274971210320ac2ba9fdde886b5dfaea9bace7cf\",\"artifact:2712:12c644028765ea16d14734229cd1c35781d831d3d5f43b4e68012ccc323cc516\":\"12c644028765ea16d14734229cd1c35781d831d3d5f43b4e68012ccc323cc516\",\"artifact:2712:158f77d1e363f45bd0f38675b5b571e4697f6af6d871c399375b2433e6103ec6\":\"158f77d1e363f45bd0f38675b5b571e4697f6af6d871c399375b2433e6103ec6\",\"artifact:2712:1a05e49b4daee56640848ff7b28b56f12b9729d0fcfdf7c20946ab433c24991d\":\"1a05e49b4daee56640848ff7b28b56f12b9729d0fcfdf7c20946ab433c24991d\",\"artifact:2712:226fe922e53bf6f73eee475984fbf6ae820820c635e65b1533f1d5e68b1ee4bd\":\"226fe922e53bf6f73eee475984fbf6ae820820c635e65b1533f1d5e68b1ee4bd\",\"artifact:2712:2f709d624230961696d7236bef50c86828fd76b9cd511317b6843b3620cd63a3\":\"2f709d624230961696d7236bef50c86828fd76b9cd511317b6843b3620cd63a3\",\"artifact:2712:34b97a1c364f66979ae33a12fe9a58768422947dd2553a7cc87a52d25e21c176\":\"34b97a1c364f66979ae33a12fe9a58768422947dd2553a7cc87a52d25e21c176\",\"artifact:2712:37c6a1dfac9ff66ec99cfa19633eb000df201eba9e8f1c89a5f2d2df6c9ac73c\":\"37c6a1dfac9ff66ec99cfa19633eb000df201eba9e8f1c89a5f2d2df6c9ac73c\",\"artifact:2712:4553f64d1e5a49bac5f5f40d2492dd47d41da0bec1315808545814813c9cb24b\":\"4553f64d1e5a49bac5f5f40d2492dd47d41da0bec1315808545814813c9cb24b\",\"artifact:2712:468459286b61386bdaa33ca5afc4d3554a915e48bff836131078e4e311be1567\":\"468459286b61386bdaa33ca5afc4d3554a915e48bff836131078e4e311be1567\",\"artifact:2712:47c09653cecd5cbef4b85ea8c9d407b5ebd0e888c8fbc7d8e145fa16c861b8e4\":\"47c09653cecd5cbef4b85ea8c9d407b5ebd0e888c8fbc7d8e145fa16c861b8e4\",\"artifact:2712:482c8916e0870fd896759b3a507fa7331599e85ec664d7d6b8fa9e189dc00ac2\":\"482c8916e0870fd896759b3a507fa7331599e85ec664d7d6b8fa9e189dc00ac2\",\"artifact:2712:49fb94ed15a27b17affc727cec857e5f2e30ed8d6535b58d15fd6a46fd852f46\":\"49fb94ed15a27b17affc727cec857e5f2e30ed8d6535b58d15fd6a46fd852f46\",\"artifact:2712:54325964fa4126310d0d7bd35ae8a2b7d043c7554cb9936dd58ee394ec0d1a6e\":\"54325964fa4126310d0d7bd35ae8a2b7d043c7554cb9936dd58ee394ec0d1a6e\",\"artifact:2712:55760a60494fffe6b4e4c3291c607c1e5300e907daa0080e4885e1d5ed406ad8\":\"55760a60494fffe6b4e4c3291c607c1e5300e907daa0080e4885e1d5ed406ad8\",\"artifact:2712:5e87cb18641d6ff6c000d45eec6612474b39e46dcda8a2caf76fa4e731ee8449\":\"5e87cb18641d6ff6c000d45eec6612474b39e46dcda8a2caf76fa4e731ee8449\",\"artifact:2712:6537fcda5cbc0711981bb3c68dd1c02f4797a8940721c060f4452278fb8a3cd4\":\"6537fcda5cbc0711981bb3c68dd1c02f4797a8940721c060f4452278fb8a3cd4\",\"artifact:2712:6a11e6417c3269ffc18e963b6cab58fc22b86ce27fd9cbb1190eebf9363deabc\":\"6a11e6417c3269ffc18e963b6cab58fc22b86ce27fd9cbb1190eebf9363deabc\",\"artifact:2712:6b126bff778ef6544e24b44d8c7390a9310a4327d28077568ca93ad9d86aa5ae\":\"6b126bff778ef6544e24b44d8c7390a9310a4327d28077568ca93ad9d86aa5ae\",\"artifact:2712:bfb8dccaae39edb8d9df47177209ee8dced7655d8f0697e434ae9363d75002a2\":\"bfb8dccaae39edb8d9df47177209ee8dced7655d8f0697e434ae9363d75002a2\",\"artifact:2712:cee00ccb7632ff4f028b53e6db78a551afeff7fff2f62c49d7304c11267b33e4\":\"cee00ccb7632ff4f028b53e6db78a551afeff7fff2f62c49d7304c11267b33e4\",\"artifact:2712:e883564fc4dd9c33c2498ee99ac4c269cce00c702c8f0043cf11a6216c635708\":\"e883564fc4dd9c33c2498ee99ac4c269cce00c702c8f0043cf11a6216c635708\",\"artifact:2712:eaaf485835382c268cc6ad77b3533034d7e173895615f814d7d0ad67ea22f4a4\":\"eaaf485835382c268cc6ad77b3533034d7e173895615f814d7d0ad67ea22f4a4\",\"artifact:2712:ead275480f065d3fe3fc156394b1c0cdb5859ae5606b604c4f0bc80fd6e95be9\":\"ead275480f065d3fe3fc156394b1c0cdb5859ae5606b604c4f0bc80fd6e95be9\",\"artifact:2712:ed43e4248cf831fdca372157e445f62eebdef2db5ce7852d3a5dca0a897da1fc\":\"ed43e4248cf831fdca372157e445f62eebdef2db5ce7852d3a5dca0a897da1fc\",\"artifact:2712:f13add851c7f09ee87bed42ddb9255896bdf1012b1ba9946d7310c95cace2df4\":\"f13add851c7f09ee87bed42ddb9255896bdf1012b1ba9946d7310c95cace2df4\",\"artifact:2712:f9dc9c344217803251c00097b442cde7cb77bb7e1b9af663467c8d73a98a92d6\":\"f9dc9c344217803251c00097b442cde7cb77bb7e1b9af663467c8d73a98a92d6\"},\"sha256\":\"05c30430c555ab8db48d1c808c97ff176ed4e11dc59e691092c0cb01fae7f1a8\"},\"targets_sha256\":\"b975e91f005e279621dcdaafa92a1369a7129de37d0a225f6a815f014a3b9209\"}\nDeclared non-witness scopes with their existing authority: []\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:2712,input_sha256:\"47aa223a36102d5035c775d2e6f70925d2a10047e8dd764597dd61ffa208117d\",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. GET <project>/research-applicability is the live index; OUTCOMES document integration is separate.","review_deferred":false,"in_triage":false,"triage":[],"lean_statement_binding":null,"lean_execution_binding":null,"lean_scientific_identity":null,"lean_execution_identity":null,"verification_runs":[],"verification_state":null,"verification_summary":null,"canonical_return":null,"review_history":[],"dependencies":[],"cited_by":[],"route_dependents":[],"research_url":null,"transcript_url":"/projects/md5/return/6728/transcript","files":[],"decided_by_author_handle":false,"reviews":[],"decisions":[],"decision":null,"report_sha256":"9d55ebafe572d5154848acf2270a51569c158ee0e4e020c13345367337d70686","next_step_sha256":null,"research_authority":{"witness_status":null,"research_status":"recorded","scopes":[]},"research_links":[],"duplicates":[],"cited_messages":[]}