{"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":"2b58f1cd-9449-4ac9-ac32-4fcffdc30fc5","kind":"skill:research-report","nodes":[{"acceptedSubmissionHash":"347d6d95c5b436cb95ec0435d3ce7fbd75f772514b49fd9a7863b922defba036","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":"2b58f1cd-9449-4ac9-ac32-4fcffdc30fc5","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":"51316","feedbackHash":"cbd8d5d39645a018fe37b0da9d96937fb8bff49b92521d52246efb50d2aa7a7f","nodeKey":"research_report","submissionHash":"347d6d95c5b436cb95ec0435d3ce7fbd75f772514b49fd9a7863b922defba036","tag1":"verification:structural","tag2":"acceptance-v2","value":1}],"site":null,"snapshotHash":"619c498dea392e751b181d6064886a68277679f97b93fd72de8aa6ccfcacc5d4","state":"completed","submissions":[{"artifacts":[{"bytes":1926,"hash":"d305342b3bfa4a29eb3f603e2aa837bc2ee3558cbed11a092ef212ed681ac7e6","mediaType":"text/markdown","name":"report","path":"artifacts/report.md"}],"attempt":1,"bundleHash":"88dc13ee364dc8a42092c5fb9ceb3e3330f2a4d32ff7c51ae5790ab269468226","device":"6b0a28df3d585600","findings":[],"hash":"347d6d95c5b436cb95ec0435d3ce7fbd75f772514b49fd9a7863b922defba036","nodeId":"eb02a0df-aba8-43c0-881f-fc1c39bead8b","outcome":"completed","summary":"I found a real collision. These two strings give SHA-256 digests with the same first 48 bits, `c94563ba4883`:\n\n```json\n{\"algo\":\"sha256\",\"lambda\":24,\"inputA\":\"imd-12192837\",\"inputB\":\"imd-19093962\"}\n```\n\n**How it was found:** `tools/find_collision.py` hashed the strings `imd-0`, `imd-1`, … with Python's `hashlib` and kept the first 6 bytes of each digest. The first repeat came after 19,093,963 hashes (about 2^24.2), which matches the expected birthday cost of about 2^24.3. The search took about 46 seconds.\n\n**Check:** I re-hashed both strings with a separate tool (`sha256sum`) and got the same 48-bit match. The rest of the two digests differ, so this only collides on the 48-bit cut-off, not on full SHA-256.\n\n**Assumptions:**\n- The verifier hashes strings without a `0x` prefix as their UTF-8 bytes, as the task says. Both inputs are plain ASCII, so the encoding question doesn't arise.\n- \"First 48 bits\" means the first 6 bytes (12 hex characters) of the digest.\n\n**Files:**\n- `collision.json`, `README.md` and `tools/find_collision.py` are committed (commit `301b849`).\n- `artifacts/report.md` is the required report. It separates facts, inferences and uncertainty. It is untracked, along with a copy of the result at `artifacts/collision.json`. The `artifacts/` folder is git-ignored, so neither file will be committed by accident.","treeHash":"20ba13b162f5c972f9422859e5818116835772ae","usage":{"cachedInputTokens":134771,"inputTokens":14,"model":"claude-opus-5-5","outputTokens":4299,"runtime":"claude","turns":10,"wallClockMs":96235}}],"verification":[{"checks":[],"detail":"paths and tree verified; no suite was run for this kind of work","evaluation":"structural","profile":"none","status":"accepted","submissionHash":"347d6d95c5b436cb95ec0435d3ce7fbd75f772514b49fd9a7863b922defba036","verifiedTreeHash":"20ba13b162f5c972f9422859e5818116835772ae","verifierVersion":"0.1.0+41305fb5"}]}