{"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":"b8006bde-41b8-48a8-ae37-3d3b6186ba5b","kind":"skill:research-report","nodes":[{"acceptedSubmissionHash":"8d8cef94c000648de328edb422b8037f3afdf96fcf72c4ef70910550837b50a1","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":"b8006bde-41b8-48a8-ae37-3d3b6186ba5b","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":"51084","feedbackHash":"5d7bd02853a0669212c02ef3813fe6569f9cf4a8f1f9745beab7e37abdf5857b","nodeKey":"research_report","submissionHash":"8d8cef94c000648de328edb422b8037f3afdf96fcf72c4ef70910550837b50a1","tag1":"verification:structural","tag2":"acceptance-v2","value":1}],"site":null,"snapshotHash":"e5f18ff4eaa1fe96a515da6ceeb94d6f84f67527bc85938be873a9ff9b70d229","state":"completed","submissions":[{"artifacts":[{"bytes":2312,"hash":"460ff6122febd81c7b6eaf978dcc97aaabb5226b53ba250ba4dd38dd8d09f525","mediaType":"text/markdown","name":"report","path":"artifacts/report.md"}],"attempt":1,"bundleHash":"16baa165749bdab0e02ec0c0f0d97c39cc3cdc0054f58a454123132c24c35aa2","device":"7c0191a32541eb74","findings":[],"hash":"8d8cef94c000648de328edb422b8037f3afdf96fcf72c4ef70910550837b50a1","nodeId":"f6a795b1-afa4-48fc-867a-4e61b45cb43a","outcome":"completed","summary":"I found a real collision on the first 48 bits of SHA-256. Both inputs give the same 48-bit prefix, `0x85f9e86fb02c`, and Python's `hashlib` and `openssl` each confirmed it separately.\n\n```json\n{\"algo\": \"sha256\", \"lambda\": 24, \"inputA\": \"0xbfd761c04ce7\", \"inputB\": \"0x616a13e2a7d4\"}\n```\n\n| input (raw bytes) | SHA-256 |\n|---|---|\n| `bfd761c04ce7` | **`85f9e86fb02c`**`301cb51e…46b89b7` |\n| `616a13e2a7d4` | **`85f9e86fb02c`**`49a2140d…8821c58` |\n\nThe full hashes start to differ at bit 49.\n\n- **How it was found:** `tools/find_collision.py` uses only standard Python. It takes 6-byte values, hashes them, keeps the first 6 bytes of the hash as the next input, and watches for two chains landing on the same value. It found the pair after about 2^23.9 hash evaluations, which matches the expected birthday cost of about 2^24.3. That took about 5 seconds on 4 cores.\n- **Main risk:** I assumed the verifier reads a `0x…` input as hex and hashes the decoded bytes. If it hashes the text `\"0xbfd761c04ce7\"` as typed instead, the pair won't match. I couldn't test against the actual SIMD verifier.\n- **Report:** `artifacts/report.md` separates facts, method, assumptions and open questions, and it is left untracked as required.\n- **Commit:** `collision.json`, `README.md` and the search script are committed on `main`.","treeHash":"99fac817f7d3a84377852bfc5d270f5d6364ead8","usage":{"cachedInputTokens":159026,"inputTokens":16,"model":"claude-opus-5-5","outputTokens":5587,"runtime":"claude","turns":9,"wallClockMs":64549}}],"verification":[{"checks":[],"detail":"paths and tree verified; no suite was run for this kind of work","evaluation":"structural","profile":"none","status":"accepted","submissionHash":"8d8cef94c000648de328edb422b8037f3afdf96fcf72c4ef70910550837b50a1","verifiedTreeHash":"99fac817f7d3a84377852bfc5d270f5d6364ead8","verifierVersion":"0.1.0+41305fb5"}]}