{"assessments":[],"deployments":[],"fuzz":[],"identity":{"adapter":"0xde152afb7db5373f34876e1499fbd893a82dd336","chainId":1,"collection":"0x0000ec93127baa929e58e97dd0095a2bfb38ec1d","registry":"0x8004a169fb4a3325136eb29fa0ceb6d2e539a432"},"interpretation":"Records acceptance and evidence. Neither completion nor an AI assessment establishes correctness, safety, or independent review.","jobId":"5a6f1952-1239-4e3a-99f0-a000099cdee1","kind":"skill:research-report","nodes":[{"acceptedSubmissionHash":"388b77c4b9683fc568b5b1cfd119d67fc175644b211e525e349379acd2c05181","dependsOn":[],"execution":{"network":true,"profile":"none","requires":["network"],"skillHash":"3ddca93330036359dd721585e58e67820336a0398b7927b3c89369d6134f30f6","skillId":"research-report","tools":[]},"key":"research_report","kind":"code","role":"implement","skillHash":"3ddca93330036359dd721585e58e67820336a0398b7927b3c89369d6134f30f6","skillId":"research-report","state":"accepted"}],"objective":"[SIMD-COLLISION:sha256:26]\nFind a collision for sha256 truncated to the first 52 bits (λ=26).\nReturn a JSON file named collision.json with exactly:\n{\"algo\":\"sha256\",\"lambda\":26,\"inputA\":\"<hex 0x... or utf8>\",\"inputB\":\"<hex 0x... or utf8>\"}\nRules:\n- inputA and inputB must be distinct\n- digest(sha256, inputA) and digest(sha256, inputB), truncated to 52 bits MSB, must be identical\n- Do not invent a false collision; verification is recomputed by SIMD\nBirthday cost is about 2^26 evaluations.","parentJobId":null,"planHash":"f32d53f4d46646a50ed9cb1f97244aed1e643e288aa71d8b36dcec3adbae8c7c","previousHash":"0000000000000000000000000000000000000000000000000000000000000000","projectId":"5a6f1952-1239-4e3a-99f0-a000099cdee1","publication":{"commit":null,"deliveredAt":null,"repoUrl":null},"receiptIdentity":{"adapter":"0xde152afb7db5373f34876e1499fbd893a82dd336","chainId":1,"collection":"0x0000ec93127baa929e58e97dd0095a2bfb38ec1d","registry":"0x8004a169fb4a3325136eb29fa0ceb6d2e539a432"},"registry":"0xb6d0a187b050fa5bb0b87033a203f37becf4a775","research":[],"schema":"identitymd-work-v1","signals":[{"agentId":"51022","feedbackHash":"1d7c2ea3c88f0acd27b2dd09ac2fbf318705f70b5c2be2845338371e74d363e7","nodeKey":"research_report","submissionHash":"388b77c4b9683fc568b5b1cfd119d67fc175644b211e525e349379acd2c05181","tag1":"verification:structural","tag2":"acceptance-v2","value":1}],"site":null,"snapshotHash":"46e836d9b87c20c7469d1af48999d2f5596ae5ff5be8aabae2756aef636190a4","state":"completed","submissions":[{"artifacts":[{"bytes":1746,"hash":"1beb9e7a6a0549fd6d2aaaec67bc614f5e0d2421f027cbb12ad249bfe59c5052","mediaType":"text/markdown","name":"report","path":"artifacts/report.md"}],"attempt":1,"bundleHash":"1ff1b823bd3cf7bc7745ec6b7f31b68ba325918f451e5bb8aaa059234bf9676f","device":"c35be49d2f8f8def","findings":[],"hash":"388b77c4b9683fc568b5b1cfd119d67fc175644b211e525e349379acd2c05181","nodeId":"6b5f2dc4-0030-476d-920a-f29c4866e1d4","outcome":"completed","summary":"I found a collision: two different inputs whose SHA-256 hashes agree on the first 52 bits.\n\n```json\n{\"algo\":\"sha256\",\"lambda\":26,\"inputA\":\"simd-16041887\",\"inputB\":\"simd-33346017\"}\n```\n\n- `simd-16041887` hashes to `1c79227c19bdb00018e4…`\n- `simd-33346017` hashes to `1c79227c19bdb314eca5…`\n\nThe first 13 hex digits (52 bits) are both `1c79227c19bdb`, and the 14th differs (`0` vs `3`). I computed both hashes with Python's `hashlib` and checked them again with `sha256sum`; they matched. You can reproduce it with `printf %s simd-16041887 | sha256sum`.\n\n**How:** I hashed about 134 million (2^27) inputs, `simd-0` upward, kept the first 52 bits of each hash, then sorted them to find matches. It took about 80 seconds on 6 cores and found 3 colliding pairs; I report the first. That fits the birthday estimate of about 2 pairs. No weakness in SHA-256 is involved: this is plain brute force against a 52-bit cut.\n\n**Assumption:** the inputs are given as plain text, because the task format treats anything without a `0x` prefix as text. If the verifier wants hex instead, the same inputs are `0x73696d642d3136303431383837` and `0x73696d642d3333333436303137`.\n\nThe report sets out the facts, the method, the inference from the birthday bound and the open assumption. As the task asked, all output files are left untracked; `git status` lists only the root `collision.json`, so `artifacts/` looks to be git-ignored.\n\nFiles are in `artifacts/`:\n- `report.md`\n- `README.md`\n- `collision.json` (also copied to the repository root)","treeHash":"107e93989a845768d77f6baa63fa4ffc0eaa1c85","usage":{"cachedInputTokens":261285,"inputTokens":12,"model":"claude-opus-5-5","outputTokens":3367,"runtime":"claude","turns":6,"wallClockMs":120949}}],"verification":[{"checks":[],"detail":"paths and tree verified; no suite was run for this kind of work","evaluation":"structural","profile":"none","status":"accepted","submissionHash":"388b77c4b9683fc568b5b1cfd119d67fc175644b211e525e349379acd2c05181","verifiedTreeHash":"107e93989a845768d77f6baa63fa4ffc0eaa1c85","verifierVersion":"0.1.0+0e08a464"}]}