{"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":"ef0f6bb4-c2c1-43c3-a174-002bd9d094ef","kind":"skill:research-report","nodes":[{"acceptedSubmissionHash":"adcadb9585e49ba298bd5eae159c1f0fc8438108e06916d43a7fcfc41c5eec31","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:sha256:25]\nFind a collision for sha256 truncated to the first 50 bits (λ=25).\nReturn a JSON file named collision.json with exactly:\n{\"algo\":\"sha256\",\"lambda\":25,\"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 50 bits MSB, must be identical\n- Do not invent a false collision; verification is recomputed by SIMD\nBirthday cost is about 2^25 evaluations.","parentJobId":null,"planHash":"5acc4c6677c901ca474c04bdf76bed24cf229fc9775152152a3d68472df2e9ec","previousHash":"0000000000000000000000000000000000000000000000000000000000000000","projectId":"ef0f6bb4-c2c1-43c3-a174-002bd9d094ef","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":"52468","feedbackHash":"4c8efacd3ac7a08c59ed9a5d1f3432579fb84434732fcc7bfd5abc89158785d5","nodeKey":"research_report","submissionHash":"adcadb9585e49ba298bd5eae159c1f0fc8438108e06916d43a7fcfc41c5eec31","tag1":"verification:structural","tag2":"acceptance-v2","value":1}],"site":null,"snapshotHash":"b5f1460894fb8548559e3032184753e136da6d27c9974188af2cc0012332454b","state":"completed","submissions":[{"artifacts":[{"bytes":2932,"hash":"c0721af6e081f2063a4cdb292e82f2866c384da5dcb7f04758f788ef250c463e","mediaType":"text/markdown","name":"report","path":"artifacts/report.md"}],"attempt":1,"bundleHash":"a7ce84319277faef3d7bccbd7b6122ee9da4673ab98fc6b0565336afb0ad830c","device":"1bac482d878ce0ac","findings":[],"hash":"adcadb9585e49ba298bd5eae159c1f0fc8438108e06916d43a7fcfc41c5eec31","nodeId":"62d1291e-b217-4fd7-8bb8-75f51a41b142","outcome":"completed","summary":"I found a real collision and checked it two separate ways.\n\n**Collision** (`collision.json`, committed in the repo root):\n```json\n{\"algo\": \"sha256\", \"lambda\": 25, \"inputA\": \"imd-266c7c8969b0e\", \"inputB\": \"imd-0545841f91fe3\"}\n```\n\n- `sha256(\"imd-266c7c8969b0e\")` = `be81b9da56ef4c03…`\n- `sha256(\"imd-0545841f91fe3\")` = `be81b9da56ef639f…`\n\nThe first 48 bits are identical (`be81b9da56ef`). The next hex digits are `4` (`0100`) and `6` (`0110`), whose top two bits also match, so the first 50 bits agree. The digests first differ at bit 52. Python's `hashlib` and the `sha256sum` command gave the same digests.\n\n**How it was found:** `tools/find_collision.py` uses only the Python standard library, because this machine has no C compiler and no numpy. It runs a parallel search for points where hash chains merge, which is the standard way to find birthday collisions without storing every hash. It took about 11 seconds on 4 cores and roughly 2^25 hash evaluations, which is what the birthday bound predicts. That evaluation count is an estimate from the run, not a direct count. Both inputs have an `imd-` prefix so neither can be mistaken for hex.\n\n**Files:**\n- **Committed:** `collision.json`, `README.md` (the question, how to reproduce it, and its limits) and the script. The commit is `36f7396`.\n- **Report:** `artifacts/report.md` covers the evidence and method, and keeps facts, inferences and uncertainty apart. There's a copy of the collision at `artifacts/collision.json`. Both are left untracked; git already ignores `artifacts/` through `.git/info/exclude`.\n- **Commit identity:** git had no user identity set up, so I set `smnn510 <smnn510@gmail.com>` as the author on that one commit only, without changing the git config.","treeHash":"958f3ca1e30a88107aaca98f9f6a5870547bad87","usage":{"cachedInputTokens":259727,"inputTokens":22,"model":"claude-opus-5-5","outputTokens":7467,"runtime":"claude","turns":12,"wallClockMs":125110}}],"verification":[{"checks":[],"detail":"paths and tree verified; no suite was run for this kind of work","evaluation":"structural","profile":"none","status":"accepted","submissionHash":"adcadb9585e49ba298bd5eae159c1f0fc8438108e06916d43a7fcfc41c5eec31","verifiedTreeHash":"958f3ca1e30a88107aaca98f9f6a5870547bad87","verifierVersion":"0.1.0+ad90ce4c"}]}