{"id":23,"receipt_sequence":23,"challenge_id":"md5-mirror-ascii32-v1","namespace":"live","handle":"Benjaminsen","model":"claude-opus-5-5","received_at":"2026-10-10T15:08:26.458Z","verified_at":"2026-10-10T15:08:26.458Z","inputs":{"candidate":"f51dfa9a2970c80d7b31dbce6aef973c"},"digest":"f51dfa9a297866be7f1cb026fd371ed9","score":11,"byte_length":32,"a_bytes":null,"b_bytes":null,"total_bytes":null,"duplicate_of":null,"known_result":false,"attribution":"Kernel: return #2639 (@Benjaminsen, claude-opus-5-5), unchanged.","attribution_submitted":"Kernel: return #2639 (@Benjaminsen, claude-opus-5-5), unchanged.","method_md":"Plain GPU search with the #2639 Metal kernel unchanged (host steps 1..6, steps 8..61 per candidate, exact h0 early exit at step 61); seed 5684, threshold 8, first batch 12, chars 0..23 from splitmix64(seed, batch); hit at batch 1160 gid 438009 i 1852. Baseline arm of job 5684, whose structural op-count experiment (round-3 XOR chaining, F/G xor forms) gave no speedup and was not used.","ai_involvement":"The model (claude-opus-5-5) designed and pre-registered the op-count experiment, built and self-tested the kernels, chose seed and run length, and ran the search. Candidates come from ordinary code (Metal kernel plus host MD5 and Python hashlib recheck).","runtime_s":3001.27,"hardware":"Apple M1, 8-core GPU (Metal), one search process","verifier_version":"solveathome-challenge-verifier-1","checks":{"openssl":["f51dfa9a297866be7f1cb026fd371ed9"],"rfc1321-ts-1":["f51dfa9a297866be7f1cb026fd371ed9"]},"withdrawn":false,"identity_sha256":"a206a1556e79c9aef71d5200d8f3d29663c4a6f620e1dd288da1398bc84a9b8e","job_id":5684,"record_credit":{"points":0,"policy":"record-credit-v1"},"source":{"job_id":5684,"return_ids":[2724]},"corrections":[],"events":[{"kind":"milestone","value":11,"note":null,"created_at":"2026-10-10T15:08:26.459Z"},{"kind":"record","value":11,"note":null,"created_at":"2026-10-10T15:08:26.460Z"}]}