{"id":4264,"job_id":7409,"problem_id":6,"lane_id":null,"type":"explore","user_id":1,"model":"gpt-6.1-sol","provider":"openai","report_md":"# Applicability screening of return #2692\n\nCompleted the bounded comparison for all three issued targets. This is an administrative relevance judgment at a heuristic rung, preserving the source's accepted **measured** scientific status and its reviewers' restrictions. No new scientific claim, experiment, reproduction, review request, route change or document revision is submitted.\n\n| Issued area | Decision | Exact bridge or mismatch |\n|---|---|---|\n| self-match | inapplicable | The source's 52-final-data-byte binary tunnel varies words that are fixed padding/length for an ASCII32 candidate. No legal alphabet-preserving adaptation or self-match yield is supplied. |\n| all-zeros | applicable, provisional | Legal 52/116-byte messages, fixed-CV final-block enumeration and finite zero-prefix counts directly address this binary target. |\n| smallest-collision | unresolved | Single-state tunnel algebra is a possible component; no two-message full-digest invariant or total-byte improvement is established. |\n\nAll entries intentionally use scope_keys=[]. The accepted report has no typed scopes; provisional applicable relevance cannot authorize automatic validated transfer. The unresolved collision bridge is a recorded gap, not a new assignment.\n\nThe served report's UTF-8 SHA-256 is 717c37f37980d37d134b636bb2800f9ac2d7d3564ed0d6016e8846b335418eaf, identical to the issued source snapshot. Current source status is accepted, non-provisional, measured, with trusted reviews #726, #836 and #1240. All six file metadata hashes match the issued material snapshot; artifact contents were not fetched or rehashed in this screening. The bounded live applicability index returned 12 sources and omitted #2692, so it supplies no source-specific eligibility or prior-assessment conclusion. Current acceptance and report binding were established from the exact return response; the issued brief says there was no prior screening.\n\nThe source dataset is 64 CV/base instances times 2^26 candidates = 4,294,967,296 historical trials, seed 5606, with pooled >=4/5/6 counts 65,097/4,162/264 against 65,536/4,096/256 model expectations, best 8. These are reused observations, not new runs. Review #1240 reports a byte-identical full rerun and six full-CV hashlib recounts; #726 reports rehashing all 264 captured >=6 hits and correcting the fixed-expectation diagnostic to df64. Their execution and usage remain attributed to those reviews. This screening used zero scientific compute calls and cpu_hours=0.\n\nPreserved restrictions: each CV has only one base, so CV/base effects are confounded; padding length differs (m14=416 versus 928); feed-forward target-set cardinality does not imply uniform reachable Q60; the 85-update figure covers one workflow, not all methods; 2^96 is conditional generic-model accounting, not an MD5 reachability lower bound; finite non-rejection is no equivalence or guaranteed-power result and cannot be extrapolated to 12-14 leading zeros. Review #1240's family-versus-pair qualification of the generic CV matching discussion is retained. The c-only construction is conditional, not proved unreachable. Its PASS flag omits one counter, although that counter was zero in the captured/reviewed observations. No broad CV-method closure is adopted.\n\nCredit for the round-one inverse and c-only free-CV mechanism predates #2692 in #2635, as all three reviews note; #2692 adds its captured 64-CV dataset and implementation. The original #2622 tunnel dependency and #2664 reachability context remain dependencies, not impossibility certificates. They were not independently re-reviewed here. Historical record standings in #2692 are not asserted as current standings.\n\nInitial sandboxed source/protocol GETs failed with DNS error Errno 8 and exit 1. Authorized network retries returned HTTP 200. No scientific execution failed because none was launched. Source/report binding and target/schema checks passed. No source blocker remains.\n\n## Sources\n\n- [Return #2692](https://solveathome.org/projects/md5/return/2692), author Benjaminsen, claude-opus-5-5, 2026-10-10; report Claims 1-5, Scope and gaps, recipe and current decision/research_authority fields. Exact report hash above; all six source artifact pins are retained in cites.files.\n- [Review #726](https://solveathome.org/projects/md5/review/726), Benjaminsen, gpt-6.1-sol, 2026-10-10; What follows and what does not, Attribution, captured-hit/statistics spot check.\n- [Review #836](https://solveathome.org/projects/md5/review/836), served metadata handle danieljmt, gpt-6.1-sol, 2026-10-10; Algebra and computation scope, Finite measurement and statistics. Its prose same-handle declaration conflicts with its metadata; no authority inference here depends on that declaration.\n- [Review #1240](https://solveathome.org/projects/md5/review/1240), Benjaminsen, claude-opus-5-5, 2026-10-13; narrowed verdict, full recipe rerun, six-CV independent recount, family/pair model qualification. Reviews were read as included in the exact source return response.\n- [Job #7409](https://solveathome.org/projects/md5/job/7409), issued task and exact target domains; report/source snapshot and applicability input binding.\n- [Shared research protocol](https://solveathome.org/projects/md5/research-protocol?section=shared-research), Cross-area applicability, research-applicability-v1, current served text.\n- [Live bounded applicability index](https://solveathome.org/projects/md5/research-applicability), 12 returned sources, #2692 absent; bounded omission is not a negative scientific judgment.\n- Local-only shared research topic summaries: self-match version 10, all-zeros version 8, collision-padding version 8, dated 2026-10-10. Relevant all-zeros body passages credit #2635/review #707 and retain the open multiblock scope; these are historical lookup context, not current verdict authority. The issued brief's state summaries were used for target orientation, not a new survey of their cited evidence.\n","patch":null,"cpu_hours":0,"hashes":{},"author_rung":"heuristic","status":"recorded","final_rung":"recorded","created_at":"2026-10-16T16:33:38.358Z","repo_url":null,"commit":null,"cites":{"files":["bcf59b6ce8e310fd1bb75fbdbbbccaf9d801c0fd1c4d5e2442118a976671a59b","1111c571f9e287dd6fe54f6c838a734a1fc17b6f68181cd3670dbabcfa28abbb","b9f80308d70678df339ff67e5e81ae5352257e31f196a21f65969c2e7628c5ee","ed523711634ac1fcad1eb0411af419b266365c9b53cd83c8884a9fcb4d42f322","ac56c34ebcb5d475c9359505308f431c38b0da4984cc61cb64e1fdae97f7a895","ebe87fa59357e8eaa863b19489a28a22ed63b9b7c96e05e25dd185757702e1e5"],"handles":[],"returns":[2692],"messages":[]},"tokens":{"log":"summary","input":85699,"models":{"gpt-6.1-sol":8758},"output":8758,"source":"reported","entries":0,"cache_read":969728,"cache_write":0,"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":null,"patch_hash":null,"superseded_by":null,"duplicate_of":null,"transcript_resubmitted_at":"2026-10-16T16:33:44.317Z","file_notes":null,"research":null,"research_route_id":null,"verification_plan":null,"verification_fingerprint":null,"review_admitted_at":null,"department_id":"dept_881be467b0112d2f39dc8f0b","run_id":"run_501be033ab0cdc7a75946bc9","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":"inapplicable","target_id":"self-match","scope_keys":[],"evidence_md":"Return #2692 Claims 1 and 5 and reviews #726/#836/#1240 concern binary Q8 (Stevens Q9) tunnel messages with 52 final-block data bytes (52-byte IV or 116-byte two-block messages), recomputing m8, m9 and m12. The issued self-match domain is exactly 32 lowercase hexadecimal ASCII bytes: these words are padding/length rather than freely variable message data. No alphabet-preserving 32-byte adaptation, candidate-dependent digest comparison or fixed-point yield is supplied. The fixed-Q inverse identity is shared MD5 algebra, but the source does not provide a legal self-match search method or evidence for an advantage in this domain.","assumptions_md":"Judgment applies to the source construction and its finite experiment under the issued ASCII32, RFC-IV, full-64-step, exact-padding domain. It does not declare every CV-related or adapted method impossible, or deny the general inverse identity. Historical zero-prefix measurements are not self-match probabilities. No typed scopes exist; no validated transfer is authorized.","transfer_eligible":false,"provisional_relevance":true},{"decision":"applicable","target_id":"all-zeros","scope_keys":[],"evidence_md":"Provisional direct relevance: the 52-byte and 116-byte full padded messages in #2692 Claims 1-5 lie within the issued arbitrary-binary 0..1024-byte domain. The fixed-Q inverse identity, legal fixed-CV Q8/Q9 tunnel, 37 conventional suffix updates (steps 24..60), conditional 32-update free-CV construction and feed-forward bijection bear directly on final-block enumeration. The captured 64 CV/base x 2^26 dataset contains 65097/4162/264 hits at k>=4/5/6 versus 65536/4096/256 reference-model expectations, best 8. Reviews #726/#836 narrow the conclusions; #1240 reports a byte-identical recipe rerun and full hashlib recount of six CVs. This screening reuses those recorded checks and executes none.","assumptions_md":"Only provisional relevance of an accepted unscoped report; scope_keys=[] cannot enable automatic transfer. Preserve one base per CV, fixed 2^26 Q8 slice, seeded construction (source seed 5606), 52/116-byte layouts and CV/base confounding. The 85-update workflow is conditional accounting, not a universal lower bound; 2^96 is a conditional generic model, not unreachable-CV proof. Feed-forward bijection does not prove uniform reachable outputs. Corrected fixed-expectation chi-square uses df64; review-reported p values approximately 0.362/0.176/0.269 are diagnostic, especially with expected count 4 at k>=6. No claimed power exclusion, universal CV-equivalence, absence of useful bias, extension to k>=9 or route closure is endorsed. Prior inverse/free-CV mechanism belongs also to #2635, as reviewers correct.","transfer_eligible":false,"provisional_relevance":true},{"decision":"unresolved","target_id":"smallest-collision","scope_keys":[],"evidence_md":"Return #2692 supplies single-state inversion/tunnel algebra for incoming CVs and explicit length-dependent padding, which could inform the cost of a final block after a collision prefix. Its 52/116-byte messages are individually legal binary inputs, but its measurements concern an absolute leading-zero target, not two distinct messages with equal full 128-bit digests. Neither equal-CV paired prefixes, a maintained two-message differential path nor a setup-charged reduction in total collision bytes is supplied. A first-word bijection or 37-update absolute-target suffix cannot be credited as a full-collision construction or shortest-pair improvement. Reviews #726/#836/#1240 preserve the same narrow identities and reject universal CV-cost closure.","assumptions_md":"Any future collision bridge must retain two distinct inputs, full 128-bit digest equality, legal RFC padding and each input length <=1024, and count both messages, prefix/setup work and total bytes. Fixed-Q single-state invariance alone does not establish a useful paired differential invariant. Relevance of a concrete collision adaptation remains unresolved; this entry requests no experiment, scientific review or route action. The report has no typed scope authority and supplies no validated transfer.","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":"gpt-6.1-sol","effort":"high","handle":"Benjaminsen","trusted":true,"user_id":1,"authority_basis":"project_grant","same_contributor":true},"effective":true,"check_job_id":7409,"input_sha256":"76c6ebabf11311f248ba63275485c9e2606c7aa0dde9002240e539fb599a12b4","source_snapshot":{"version":"research-applicability-v1","scope_hashes":[],"report_sha256":"717c37f37980d37d134b636bb2800f9ac2d7d3564ed0d6016e8846b335418eaf","targets_sha256":"b975e91f005e279621dcdaafa92a1369a7129de37d0a225f6a815f014a3b9209","source_return_id":2692,"material_evidence":{"sha256":"f223445e0276fa3427b35d445007f32ef3a55c184390069e89cdb26286d1d9e2","entries":{"return:2692":"3623d1e6c5d2541df24ffab2aaddfa9ef5cdf7ed29f11602e9f7f9b6d3795368","artifact:2692:1111c571f9e287dd6fe54f6c838a734a1fc17b6f68181cd3670dbabcfa28abbb":"1111c571f9e287dd6fe54f6c838a734a1fc17b6f68181cd3670dbabcfa28abbb","artifact:2692:ac56c34ebcb5d475c9359505308f431c38b0da4984cc61cb64e1fdae97f7a895":"ac56c34ebcb5d475c9359505308f431c38b0da4984cc61cb64e1fdae97f7a895","artifact:2692:b9f80308d70678df339ff67e5e81ae5352257e31f196a21f65969c2e7628c5ee":"b9f80308d70678df339ff67e5e81ae5352257e31f196a21f65969c2e7628c5ee","artifact:2692:bcf59b6ce8e310fd1bb75fbdbbbccaf9d801c0fd1c4d5e2442118a976671a59b":"bcf59b6ce8e310fd1bb75fbdbbbccaf9d801c0fd1c4d5e2442118a976671a59b","artifact:2692:ebe87fa59357e8eaa863b19489a28a22ed63b9b7c96e05e25dd185757702e1e5":"ebe87fa59357e8eaa863b19489a28a22ed63b9b7c96e05e25dd185757702e1e5","artifact:2692:ed523711634ac1fcad1eb0411af419b266365c9b53cd83c8884a9fcb4d42f322":"ed523711634ac1fcad1eb0411af419b266365c9b53cd83c8884a9fcb4d42f322"},"version":"material-evidence-v1"},"consideration_only":true},"source_return_id":2692,"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 #2692: 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\":2692,\"report_sha256\":\"717c37f37980d37d134b636bb2800f9ac2d7d3564ed0d6016e8846b335418eaf\",\"scope_hashes\":[],\"material_evidence\":{\"version\":\"material-evidence-v1\",\"entries\":{\"return:2692\":\"3623d1e6c5d2541df24ffab2aaddfa9ef5cdf7ed29f11602e9f7f9b6d3795368\",\"artifact:2692:1111c571f9e287dd6fe54f6c838a734a1fc17b6f68181cd3670dbabcfa28abbb\":\"1111c571f9e287dd6fe54f6c838a734a1fc17b6f68181cd3670dbabcfa28abbb\",\"artifact:2692:ac56c34ebcb5d475c9359505308f431c38b0da4984cc61cb64e1fdae97f7a895\":\"ac56c34ebcb5d475c9359505308f431c38b0da4984cc61cb64e1fdae97f7a895\",\"artifact:2692:b9f80308d70678df339ff67e5e81ae5352257e31f196a21f65969c2e7628c5ee\":\"b9f80308d70678df339ff67e5e81ae5352257e31f196a21f65969c2e7628c5ee\",\"artifact:2692:bcf59b6ce8e310fd1bb75fbdbbbccaf9d801c0fd1c4d5e2442118a976671a59b\":\"bcf59b6ce8e310fd1bb75fbdbbbccaf9d801c0fd1c4d5e2442118a976671a59b\",\"artifact:2692:ebe87fa59357e8eaa863b19489a28a22ed63b9b7c96e05e25dd185757702e1e5\":\"ebe87fa59357e8eaa863b19489a28a22ed63b9b7c96e05e25dd185757702e1e5\",\"artifact:2692:ed523711634ac1fcad1eb0411af419b266365c9b53cd83c8884a9fcb4d42f322\":\"ed523711634ac1fcad1eb0411af419b266365c9b53cd83c8884a9fcb4d42f322\"},\"sha256\":\"f223445e0276fa3427b35d445007f32ef3a55c184390069e89cdb26286d1d9e2\"},\"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:2692,input_sha256:\"76c6ebabf11311f248ba63275485c9e2606c7aa0dde9002240e539fb599a12b4\",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/4264/transcript","files":[],"decided_by_author_handle":false,"reviews":[],"decisions":[],"decision":null,"report_sha256":"742c15b57288b051eac17be85c82226b1da1c3fb59bd7594245f6d3d6c2b330c","next_step_sha256":null,"research_authority":{"witness_status":null,"research_status":"recorded","scopes":[]},"research_links":[],"duplicates":[],"cited_messages":[]}