{"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":"d946431a-0979-4299-b6da-4670b375a853","kind":"skill:research-report","nodes":[{"acceptedSubmissionHash":"fcd3f7e3987e69c4229749d6ca753ba9beb02619ab9eb0a69629d0d15b3a0aea","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:sha256:24]\nFind a collision for sha256 truncated to the first 48 bits (λ=24).\nReturn a JSON file named collision.json with exactly:\n{\"algo\":\"sha256\",\"lambda\":24,\"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 48 bits MSB, must be identical\n- Do not invent a false collision; verification is recomputed by SIMD\nBirthday cost is about 2^24 evaluations.","parentJobId":null,"planHash":"86625dc03c637a82308203516e25acf6912160ac4f045e34c15268626b6b5048","previousHash":"0000000000000000000000000000000000000000000000000000000000000000","projectId":"d946431a-0979-4299-b6da-4670b375a853","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":"51139","feedbackHash":"fd669a0bb839207eb477566823a869f9ecccbb561970b52bc07b515af64787b3","nodeKey":"research_report","submissionHash":"fcd3f7e3987e69c4229749d6ca753ba9beb02619ab9eb0a69629d0d15b3a0aea","tag1":"verification:structural","tag2":"acceptance-v2","value":1}],"site":null,"snapshotHash":"ddf12c066f81cb24ed4df6c5b440435b90a04de0ff028f6796af115932096fae","state":"completed","submissions":[{"artifacts":[],"attempt":1,"bundleHash":null,"device":"8d210756eb9ac4d7","findings":[],"hash":"db76d6ef7684176568230508d005f44f583150ab0a2ed995723b9c9a7e98d7ce","nodeId":"15e08ea6-4ed8-40e2-95f4-6c70500be6ec","outcome":"failed","summary":"Selected model is at capacity. Please try a different model.","treeHash":null,"usage":{"cachedInputTokens":0,"inputTokens":0,"model":"gpt-5.6-sol","outputTokens":0,"runtime":"codex","turns":0,"wallClockMs":2908}},{"artifacts":[{"bytes":1922,"hash":"c365c3f9658606e7984a63e0adfd30f9d715b1df55c02510b4a2419a4fa78b1e","mediaType":"text/markdown","name":"report","path":"artifacts/report.md"}],"attempt":1,"bundleHash":"5e2400f3061e584fc4196506ba324c87c6b68ce7c721939368a2e82dd464ea8e","device":"8d26cb1a4eaeb75a","findings":[],"hash":"fcd3f7e3987e69c4229749d6ca753ba9beb02619ab9eb0a69629d0d15b3a0aea","nodeId":"15e08ea6-4ed8-40e2-95f4-6c70500be6ec","outcome":"completed","summary":"I found a real collision: the strings `imd-12192837` and `imd-19093962` are distinct, but their SHA-256 hashes start with the same 48 bits, `c94563ba4883`.\n\n`collision.json` in the repository root holds:\n```json\n{\"algo\":\"sha256\",\"lambda\":24,\"inputA\":\"imd-12192837\",\"inputB\":\"imd-19093962\"}\n```\n\n**Check:** I hashed both inputs with two separate tools, Node.js's built-in `crypto` module and the `openssl` command line. Both give:\n- `imd-12192837` → `c94563ba4883` 4c66186f…74d9\n- `imd-19093962` → `c94563ba4883` 0d17ce78…2211\n\nThe first 6 bytes match and the rest of each hash differs.\n\n**How it was found:** `tools/find_collision.js` hashes `imd-0`, `imd-1`, … and stores the first 48 bits of each result until one repeats. The first repeat came after 19,093,963 hashes (about 2^24.2), in about 43 seconds. That is about what the birthday bound predicts (around 2^24.3). Python isn't installed here, so the search uses Node.js with no extra packages.\n\n**Assumptions:** I'm relying on two readings of the task text that I couldn't check against the verifier itself:\n- Inputs without a `0x` prefix are read as UTF-8 text.\n- \"First 48 bits\" means the first 6 bytes of the hash as it prints in hex.\n\n**Files:**\n- `collision.json` and `tools/find_collision.js`, both untracked. Nothing is committed.\n- `artifacts/report.md`: the report, with facts, assumptions and open questions in separate sections.\n- `artifacts/README.md`: the question and its limits.\n- `artifacts/collision.json`: a copy of the answer.\n\nThe repository's own git settings already ignore `artifacts/`, so it stays out of git as the instructions for the uploaded outputs require. No scratch files were left behind.","treeHash":"8e3c831c45fb7d92bffd6831f978371499092cb8","usage":{"cachedInputTokens":148632,"inputTokens":16,"model":"claude-opus-5-5","outputTokens":3834,"runtime":"claude","turns":8,"wallClockMs":93249}}],"verification":[{"checks":[],"detail":"paths and tree verified; no suite was run for this kind of work","evaluation":"structural","profile":"none","status":"accepted","submissionHash":"fcd3f7e3987e69c4229749d6ca753ba9beb02619ab9eb0a69629d0d15b3a0aea","verifiedTreeHash":"8e3c831c45fb7d92bffd6831f978371499092cb8","verifierVersion":"0.1.0+41305fb5"}]}