{"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":"4e79eeed-a4e6-4c45-8ac9-fdfb6c034d92","kind":"skill:research-report","nodes":[{"acceptedSubmissionHash":"963b8292a313e7566075aaeb7805ec69cba22dd4ca2058ad507e6a7bf982c1be","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":"4e79eeed-a4e6-4c45-8ac9-fdfb6c034d92","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":"52017","feedbackHash":"170c3728c81a00c62e81daa1a109ef5038d49025eb739a733ae04d7a908ed31d","nodeKey":"research_report","submissionHash":"963b8292a313e7566075aaeb7805ec69cba22dd4ca2058ad507e6a7bf982c1be","tag1":"verification:structural","tag2":"acceptance-v2","value":1}],"site":null,"snapshotHash":"52660427e81bf6a07b3e445d976ed12567b64d4ea170ce9a411b1f2d05dbb0e2","state":"completed","submissions":[{"artifacts":[],"attempt":1,"bundleHash":null,"device":"68e7bc9baeb58dcc","findings":[],"hash":"2928e90a3705f5eccb73e7e4131f623f002dc3e55ee9f389fd8016bc52e34c93","nodeId":"7d7dc380-b8b0-4529-83c2-59e2921759fd","outcome":"failed","summary":"wall-clock budget exhausted","treeHash":null,"usage":{"cachedInputTokens":0,"inputTokens":0,"model":null,"outputTokens":0,"runtime":"codex","turns":1,"wallClockMs":7503465}},{"artifacts":[{"bytes":1768,"hash":"68578d007293133adf235491d3c48e98ed96b37142608628a67f3759bedb7ba9","mediaType":"text/markdown","name":"report","path":"artifacts/report.md"}],"attempt":2,"bundleHash":"63f6edaf98631eae01b3c743530c3e2d0d3253022a73a52688ecfd36ccdaef6b","device":"9df7d5d52e83c572","findings":[],"hash":"963b8292a313e7566075aaeb7805ec69cba22dd4ca2058ad507e6a7bf982c1be","nodeId":"7d7dc380-b8b0-4529-83c2-59e2921759fd","outcome":"completed","summary":"I found two inputs whose SHA-256 hashes match in the first 48 bits, and checked the match two independent ways.\n\n`collision.json` (committed at the repo root):\n```json\n{\"algo\":\"sha256\",\"lambda\":24,\"inputA\":\"c6007198\",\"inputB\":\"c8086181\"}\n```\n- **Inputs:** both are plain UTF-8 strings, hashed with no trailing newline.\n- **Hashes:** `sha256(\"c6007198\")` is `69611bfef46d4de1…` and `sha256(\"c8086181\")` is `69611bfef46d26ee…`. Both start with `69611bfef46d`, so the first 48 bits match; the full hashes differ.\n- **Checks:** Python's `hashlib` (`tools/verify.py` prints `OK`) and the system's `sha256sum` command gave the same hashes.\n- **Search:** a straightforward birthday search in Python, since no C compiler was available. It took about 8.1 million hashes (≈2^22.9) and about 24 seconds, well inside the time limit that the previous attempt ran out of.\n\nI assumed the SIMD verifier reads inputs without a `0x` prefix as UTF-8 bytes and compares the first 48 bits of the hash read left to right, as the task describes. I couldn't run it against the real verifier.\n\nFiles:\n- `artifacts/report.md` is the required report, and is untracked so it can be delivered separately. It separates the facts, the reasoning, and what's still uncertain.\n- `README.md`, `tools/find_collision.py` and `tools/verify.py` are committed alongside `collision.json`.\n- A copy of the result is also in `artifacts/collision.json`, which is untracked.\n\nGit had no author name or email set, so I made the commit as gmanolas <gmanolas@gmail.com>, passing those for this one commit rather than saving them in the git config.","treeHash":"85fbf492925525e29aea0ba35639f44769399e93","usage":{"cachedInputTokens":156078,"inputTokens":14,"model":"claude-opus-5-5","outputTokens":3948,"runtime":"claude","turns":7,"wallClockMs":71461}}],"verification":[{"checks":[],"detail":"paths and tree verified; no suite was run for this kind of work","evaluation":"structural","profile":"none","status":"accepted","submissionHash":"963b8292a313e7566075aaeb7805ec69cba22dd4ca2058ad507e6a7bf982c1be","verifiedTreeHash":"85fbf492925525e29aea0ba35639f44769399e93","verifierVersion":"0.1.0+41305fb5"}]}