{
  "schema": "quantem.ssb.mps.scaling.signoff.v1",
  "date": "2026-08-01",
  "machine": {
    "chip": "Apple M5 Max",
    "physical_memory_bytes": 137438953472,
    "mlx": "0.32.0",
    "python": "3.13.13"
  },
  "source": {
    "label": "anonymized native 512 full-BF reference",
    "native_scan_shape": [512, 512],
    "logical_bf": 9074,
    "stored_bf": 2476
  },
  "contract": {
    "precision": {
      "real": "float32",
      "complex": "complex64"
    },
    "optuna_trials": 200,
    "seed": 0,
    "refinement": "nelder-mead",
    "reference_engine_sha256": "1e13cf83c6d00bdd8f561b806008e5cff6b92bcfb95f83aaaa947b666fb10837",
    "randomized_bit_exact_pair_checks_per_size": 20
  },
  "measurement_scope": {
    "signoffs": "prepared_evidence_optimization",
    "public_native_512_fit_seconds": 7.062,
    "public_native_512_process_wall_seconds": 7.87,
    "note": "Only 512 has a native acquisition. The other sizes are Fourier-resized kernel microscopes, so no native end-to-end acquisition claim is made for them."
  },
  "four_x_targets": {
    "public_512_anchor": {
      "reference_fit_seconds": 7.062,
      "128": 0.441375,
      "256": 1.7655,
      "512": 7.062,
      "1024": 28.248
    },
    "prepared_512_anchor": {
      "reference_fit_seconds": 6.676722375006648,
      "128": 0.4172951484379155,
      "256": 1.669180593751662,
      "512": 6.676722375006648,
      "1024": 26.70688950002659
    }
  },
  "signoffs": [
    {
      "size": 128,
      "date_utc": "2026-08-01T16:57:01.273388+00:00",
      "evidence": "fourier_resized_microscope",
      "fit_seconds": 0.8363170410011662,
      "fit_wall_seconds": 0.8508539169997675,
      "fit_peak_active_bytes": 839956628,
      "pair_median_seconds": 0.0050863539981946815,
      "pair_p95_seconds": 0.005491195898139267,
      "optuna_seconds": 0.6986454170037177,
      "refinement_seconds": 0.09615891700377688,
      "refinement_evaluations": 39,
      "records": 240,
      "loss": 0.013543525710701942,
      "aberrations": {
        "C10": -21.54113130573985,
        "C12": 4.867826734444589,
        "phi12": -0.06604599676507825
      },
      "phase_sha256": "0a82d2562c984a13f685d705a6b23056426cb66135b49d7a69e792fb0a62e39f",
      "object_sha256": "fb63e1c8721a76fcd736c16363d48f158aa5d5aca179163c1886fd3b5f951897",
      "target_met": false
    },
    {
      "size": 256,
      "date_utc": "2026-08-01T16:57:14.361141+00:00",
      "evidence": "fourier_resized_microscope",
      "fit_seconds": 2.13628100000642,
      "fit_wall_seconds": 2.152006625001377,
      "fit_peak_active_bytes": 3354412180,
      "pair_median_seconds": 0.015889791498921113,
      "pair_p95_seconds": 0.016430125000260885,
      "optuna_seconds": 1.7707723749990691,
      "refinement_seconds": 0.2928739580020192,
      "refinement_evaluations": 33,
      "records": 234,
      "loss": 0.028604159131646156,
      "aberrations": {
        "C10": -30.10375544313157,
        "C12": 14.846583461933143,
        "phi12": -1.5756104677624165
      },
      "phase_sha256": "d7646d1974608ae5edc00737392de41954311a4b08a8bbab222c27d33594c439",
      "object_sha256": "e0260482b9269b424fdb488d70e7b20b3d3557791e987b5821fffbe79e379e4e",
      "target_met": false
    },
    {
      "size": 512,
      "date_utc": "2026-08-01T16:57:32.753890+00:00",
      "evidence": "native",
      "fit_seconds": 6.676722375006648,
      "fit_wall_seconds": 6.691809750001994,
      "fit_peak_active_bytes": 13108314728,
      "pair_median_seconds": 0.04756175050351885,
      "pair_p95_seconds": 0.0486189770494093,
      "optuna_seconds": 5.1448142919980455,
      "refinement_seconds": 1.243883042006928,
      "refinement_evaluations": 43,
      "records": 244,
      "loss": 0.0458005927503109,
      "aberrations": {
        "C10": -73.36156674812457,
        "C12": 22.00675049098775,
        "phi12": -0.1211768239269985
      },
      "phase_sha256": "6af87c03377e5ec9f6bf18a78ed3ceeb738fff2f720ac844187e56f718309013",
      "object_sha256": "6d5fd4cad980bda023099b95898d3a975b55e64ef45a1e4cc818049576314d21",
      "target_met": true,
      "target_note": "This is the same-scope prepared-evidence reference. The accepted public fit remains 7.062 s because it includes preparation."
    },
    {
      "size": 1024,
      "date_utc": "2026-08-01T17:00:09.899966+00:00",
      "evidence": "fourier_resized_microscope",
      "fit_seconds": 46.10416100000293,
      "fit_wall_seconds": 46.12384912499692,
      "fit_peak_active_bytes": 15301320364,
      "setup_wall_seconds": 1.009939374998794,
      "warm_source_open_through_fit_seconds": 47.14008341700537,
      "pair_median_seconds": 0.36059033349738456,
      "pair_p95_seconds": 0.36326310815275065,
      "optuna_seconds": 30.34052504200372,
      "refinement_seconds": 14.988607833001879,
      "refinement_evaluations": 81,
      "records": 282,
      "loss": 0.05139942094683647,
      "aberrations": {
        "C10": -111.17522335130332,
        "C12": 61.01784257512888,
        "phi12": -0.3743199184116386
      },
      "phase_sha256": "9a3610ece6217bef679fe53496d28848666381f0724221e8da331de4a9b4e519",
      "object_sha256": "63c8060f1c402edcfdbffa2363bbff5a8c4f1df2a6ea34582ff87a1a685e2bc3",
      "target_met": false,
      "pair_note": "Pair distribution ran after the complete fit and is thermally saturated; the retained pre-fit clean pair is about 0.274 s."
    }
  ],
  "optimization_follow_up": {
    "date_utc": "2026-08-01T18:06:18.325303+00:00",
    "size": 1024,
    "change": "Use one row per producer threadgroup instead of two in the exact 1024 fused loss evaluator.",
    "precision": {
      "real": "float32",
      "complex": "complex64"
    },
    "paired_evaluator": {
      "alternating_samples_per_engine": 31,
      "reference_median_seconds": 0.4285052920022281,
      "candidate_median_seconds": 0.4173937500017928,
      "speedup": 1.0266212467253943,
      "randomized_bit_exact_checks": 20
    },
    "scalar_evaluator": {
      "alternating_samples_per_engine": 31,
      "reference_median_seconds": 0.17186129200126743,
      "candidate_median_seconds": 0.16853808299492812,
      "speedup": 1.0197178521749255,
      "randomized_bit_exact_checks": 20
    },
    "full_fit_parity": {
      "opposite_orders_tested": true,
      "records": 282,
      "refinement_evaluations": 81,
      "loss": 0.05139942094683647,
      "aberrations": {
        "C10": -111.17522335130332,
        "C12": 61.01784257512888,
        "phi12": -0.3743199184116386
      },
      "phase_sha256": "9a3610ece6217bef679fe53496d28848666381f0724221e8da331de4a9b4e519",
      "object_sha256": "63c8060f1c402edcfdbffa2363bbff5a8c4f1df2a6ea34582ff87a1a685e2bc3",
      "independent_candidate_seconds": 46.79334045800351,
      "symmetric_reference_seconds": [87.17050333299994, 65.62495491700247],
      "symmetric_candidate_seconds": [68.95059674999357, 63.58075241700135],
      "timing_note": "The closest late full-fit pair favored the candidate by 3.1%, but the Mac had severe, changing external load. These are parity/relative gates and do not replace the independent 46.104 s clean record."
    },
    "profile": {
      "paired_row_producer_seconds": 0.12,
      "paired_column_consumer_seconds": 0.16,
      "paired_ordered_accumulation_seconds": 0.003,
      "logical_minimum_traffic_bytes": 93486000000
    },
    "target_met": false
  },
  "thermal_diagnostic": {
    "size": 512,
    "fit_seconds": 9.995512040994072,
    "pair_median_seconds": 0.06905562500469387,
    "preceded_by_1024_signoff": true,
    "quiet_prepared_fit_seconds": 6.676722375006648,
    "conclusion": "A production-engine 512 run immediately after the long 1024 signoff was 50% slower. Sequential matrix runs are thermal diagnostics; independent processes provide the retained signoffs."
  }
}