diff --git a/docs/user-guide/market-impact.md b/docs/user-guide/market-impact.md
index 2d12317b..f1be5995 100644
--- a/docs/user-guide/market-impact.md
+++ b/docs/user-guide/market-impact.md
@@ -157,11 +157,18 @@ from ml4t.backtest.execution import LinearImpact
 
 engine = Engine(
     feed, strategy, config,
-    market_impact_model=LinearImpact(eta=0.1),
+    market_impact_model=LinearImpact(coefficient=0.1),
 )
 ```
 
-An order that is 10% of bar volume with `eta=0.1` moves the fill price by 1%.
+An order that is 10% of bar volume with `coefficient=0.1` moves the fill price by 1%.
+
+Impact from every model here is entirely temporary: `calculate` is handed one order and holds no
+reference to earlier slices of the same parent, so there is nothing for a permanent component to
+persist into. `LinearImpact` accepted a `permanent_fraction` argument through 0.1.6 and never read
+it, so a caller asking for a mostly permanent model got a fully temporary one and no warning. The
+argument is removed rather than defaulted, so the request now raises `TypeError` instead of being
+answered wrongly. Model persistence outside the engine if you need it.
 
 ### Square-Root Impact
 
@@ -176,7 +183,7 @@ from ml4t.backtest.execution import SquareRootImpact
 
 engine = Engine(
     feed, strategy, config,
-    market_impact_model=SquareRootImpact(eta=0.5),
+    market_impact_model=SquareRootImpact(coefficient=0.5),
 )
 ```
 
diff --git a/src/ml4t/backtest/execution/impact.py b/src/ml4t/backtest/execution/impact.py
index d17db16b..695652b3 100644
--- a/src/ml4t/backtest/execution/impact.py
+++ b/src/ml4t/backtest/execution/impact.py
@@ -67,8 +67,13 @@ class LinearImpact(MarketImpactModel):
     Args:
         coefficient: Impact scaling factor (default 0.1)
                     Higher values = more impact per unit participation
-        permanent_fraction: Fraction of impact that is permanent (0-1)
-                           Remainder is temporary and reverts
+
+    The impact this returns is entirely temporary: ``calculate`` sees one order
+    and holds no reference to earlier slices of the same parent, so there is
+    nothing for a permanent component to persist into. A ``permanent_fraction``
+    field was accepted and documented here until 0.1.7 and was never read; it is
+    removed rather than defaulted so that asking for a permanent component
+    raises instead of silently returning a fully temporary one.
 
     Example:
         model = LinearImpact(coefficient=0.1)
@@ -76,7 +81,6 @@ class LinearImpact(MarketImpactModel):
     """
 
     coefficient: float = 0.1
-    permanent_fraction: float = 0.5
 
     def calculate(
         self,
diff --git a/tests/compatibility/snapshots/v0.1.json b/tests/compatibility/snapshots/v0.1.json
index 229746ce..94f01c4f 100644
--- a/tests/compatibility/snapshots/v0.1.json
+++ b/tests/compatibility/snapshots/v0.1.json
@@ -2696,7 +2696,7 @@
       },
       "module": "ml4t.backtest.execution.impact",
       "qualname": "LinearImpact",
-      "signature": "(coefficient: float = 0.1, permanent_fraction: float = 0.5) -> None"
+      "signature": "(coefficient: float = 0.1) -> None"
     },
     "ml4t.backtest.execution:NoImpact": {
       "kind": "class",
diff --git a/tests/contracts/test_real_strategy_runner.py b/tests/contracts/test_real_strategy_runner.py
index efea8611..c1918f8c 100644
--- a/tests/contracts/test_real_strategy_runner.py
+++ b/tests/contracts/test_real_strategy_runner.py
@@ -362,14 +362,53 @@ def test_real_strategy_benchmark_interval_is_deterministic() -> None:
 
 
 def test_real_strategy_performance_evidence_fails_stale_source() -> None:
+    """An engine source that is neither measured-under nor certified is refused.
+
+    Both escape hatches have to be closed at once. The shipped report reaches the
+    current source through `certified_equivalent_sources`, so blanking only the
+    measured-under digest leaves it publishable and proves nothing.
+    """
     benchmark = _load_benchmark()
     validation = Path(__file__).parents[2] / "validation"
     correctness = json.loads((validation / "REAL_STRATEGY_RESULTS.json").read_text())
     report = json.loads((validation / "REAL_STRATEGY_PERFORMANCE.json").read_text())
     changed = copy.deepcopy(report)
     changed.setdefault("provenance", {})["ml4t_engine_source_sha256"] = "0" * 64
+    changed["provenance"]["certified_equivalent_sources"] = []
 
     assert benchmark.report_failures(report, correctness) == []
     failures = benchmark.report_failures(changed, correctness)
 
-    assert "Real-strategy performance engine source digest is stale" in failures
+    assert any("neither the source these" in failure for failure in failures)
+
+
+def test_certification_alone_publishes_a_later_engine_source() -> None:
+    """Timings measured under one source publish for a certified later one."""
+    benchmark = _load_benchmark()
+    validation = Path(__file__).parents[2] / "validation"
+    correctness = json.loads((validation / "REAL_STRATEGY_RESULTS.json").read_text())
+    report = json.loads((validation / "REAL_STRATEGY_PERFORMANCE.json").read_text())
+    provenance = report["provenance"]
+    certified = provenance.get("certified_equivalent_sources") or []
+
+    # The working tree is reachable only through a certification, never because the
+    # timings were measured under it: those two digests must differ, or this test
+    # passes for the wrong reason.
+    current = benchmark._tree_digest(benchmark.PROJECT_ROOT / "src/ml4t/backtest")
+    assert current != provenance["ml4t_engine_source_sha256"]
+    assert current in {entry["engine_source_sha256"] for entry in certified}
+    assert benchmark.report_failures(report, correctness) == []
+
+
+def test_malformed_certification_is_refused() -> None:
+    """A certification missing its evidence cannot publish anything."""
+    benchmark = _load_benchmark()
+    validation = Path(__file__).parents[2] / "validation"
+    correctness = json.loads((validation / "REAL_STRATEGY_RESULTS.json").read_text())
+    report = json.loads((validation / "REAL_STRATEGY_PERFORMANCE.json").read_text())
+
+    for field in ("reason", "correctness_evidence_sha256", "correctness_pairs_passed"):
+        changed = copy.deepcopy(report)
+        del changed["provenance"]["certified_equivalent_sources"][0][field]
+        failures = benchmark.report_failures(changed, correctness)
+        assert any("Certification 0 lacks" in failure for failure in failures), field
diff --git a/tests/execution/test_impact.py b/tests/execution/test_impact.py
index ba408649..7ea52166 100644
--- a/tests/execution/test_impact.py
+++ b/tests/execution/test_impact.py
@@ -2,6 +2,8 @@
 
 import math
 
+import pytest
+
 from ml4t.backtest.execution.impact import (
     LinearImpact,
     NoImpact,
@@ -39,7 +41,17 @@ def test_default_values(self):
         """Test default configuration."""
         model = LinearImpact()
         assert model.coefficient == 0.1
-        assert model.permanent_fraction == 0.5
+
+    def test_rejects_permanent_fraction(self):
+        """A permanent component cannot be honoured, so asking for one raises.
+
+        ``calculate`` sees a single order with no reference to earlier slices of
+        the same parent, so impact it returns is entirely temporary. The field
+        was accepted and never read through 0.1.6: a caller asking for a mostly
+        permanent model got a fully temporary one and no warning.
+        """
+        with pytest.raises(TypeError):
+            LinearImpact(coefficient=0.1, permanent_fraction=0.8)
 
     def test_buy_positive_impact(self):
         """Test that buy orders have positive impact (price goes up)."""
diff --git a/validation/CORRECTNESS_RESULTS.json b/validation/CORRECTNESS_RESULTS.json
index 9296dabe..0e758e3b 100644
--- a/validation/CORRECTNESS_RESULTS.json
+++ b/validation/CORRECTNESS_RESULTS.json
@@ -63,7 +63,7 @@
       "version": "3.1.1"
     }
   },
-  "generated_at": "2026-09-03T07:11:20.595248+00:00",
+  "generated_at": "2026-09-11T23:12:54.241110+00:00",
   "input_policy": {
     "float_quantum": "0.00000001",
     "rounding": "ROUND_HALF_EVEN",
@@ -704,7 +704,7 @@
         "scenario_id": "01"
       },
       "detail": null,
-      "duration_seconds": 2.427215111005353,
+      "duration_seconds": 2.701970663969405,
       "framework": "vectorbt_pro",
       "framework_result": {
         "capabilities": {
@@ -1361,7 +1361,7 @@
           "canonical_records": "fa1d9846bdc895cf62e6435097a8953d131ac16f6ae910d41ba81a5090c43707",
           "capabilities": "dd0f50965982db8aae711f850740fc1d26c5f09d8b7c3d24221b347a7e14c8aa",
           "comparator": "de6683dd96cab7fc9ce005f4651b7de359b8ddfcd6402b543960133ca35b0f5e",
-          "engine": "8011ecdaf90807b4fe4fb5ada518a237311774b32891179bf1fad0a0baad8a58",
+          "engine": "d625ed4aec3e4cd745f2ebd5138d9f6177c187f53cf6fe613d258a952d99a744",
           "manifest": "38e64faa733ac8412b0a1cabec5357be229852f19b432f2f215a7bf20f3a2780",
           "ml4t_runner": "6e9753811241863f59fc6607f315237aa1caec673372ef3b3a85fc959cf426e0",
           "profile": "4d2cacb23e64dacdbb2eda228691671d3a5d327dbbdd899de310551b244bae54",
@@ -1374,7 +1374,7 @@
         },
         "input_digest": "465e20dbdd050a15410d58b7391e304491566407369632fbda07da88e4cc1cee",
         "ml4t": {
-          "commit": "da6a17f81729c7f3c38483b7e9aeaf8e7f4e10ad",
+          "commit": "ad894ce99d385c654db3864442404b01337396bf",
           "dirty": false
         },
         "python": {
@@ -2034,7 +2034,7 @@
         "scenario_id": "02"
       },
       "detail": null,
-      "duration_seconds": 2.3356575799989514,
+      "duration_seconds": 2.685133196064271,
       "framework": "vectorbt_pro",
       "framework_result": {
         "capabilities": {
@@ -2691,7 +2691,7 @@
           "canonical_records": "fa1d9846bdc895cf62e6435097a8953d131ac16f6ae910d41ba81a5090c43707",
           "capabilities": "dd0f50965982db8aae711f850740fc1d26c5f09d8b7c3d24221b347a7e14c8aa",
           "comparator": "de6683dd96cab7fc9ce005f4651b7de359b8ddfcd6402b543960133ca35b0f5e",
-          "engine": "8011ecdaf90807b4fe4fb5ada518a237311774b32891179bf1fad0a0baad8a58",
+          "engine": "d625ed4aec3e4cd745f2ebd5138d9f6177c187f53cf6fe613d258a952d99a744",
           "manifest": "38e64faa733ac8412b0a1cabec5357be229852f19b432f2f215a7bf20f3a2780",
           "ml4t_runner": "6e9753811241863f59fc6607f315237aa1caec673372ef3b3a85fc959cf426e0",
           "profile": "8901a4a7a750c26fb43ceb5d89b4c6ccf9279503da8659b8398cce30d90c8d9c",
@@ -2704,7 +2704,7 @@
         },
         "input_digest": "465e20dbdd050a15410d58b7391e304491566407369632fbda07da88e4cc1cee",
         "ml4t": {
-          "commit": "da6a17f81729c7f3c38483b7e9aeaf8e7f4e10ad",
+          "commit": "ad894ce99d385c654db3864442404b01337396bf",
           "dirty": false
         },
         "python": {
@@ -2861,7 +2861,7 @@
         "scenario_id": "03"
       },
       "detail": null,
-      "duration_seconds": 2.3383967260015197,
+      "duration_seconds": 2.7061170999659225,
       "framework": "vectorbt_pro",
       "framework_result": {
         "capabilities": {
@@ -3009,7 +3009,7 @@
           "canonical_records": "fa1d9846bdc895cf62e6435097a8953d131ac16f6ae910d41ba81a5090c43707",
           "capabilities": "dd0f50965982db8aae711f850740fc1d26c5f09d8b7c3d24221b347a7e14c8aa",
           "comparator": "de6683dd96cab7fc9ce005f4651b7de359b8ddfcd6402b543960133ca35b0f5e",
-          "engine": "8011ecdaf90807b4fe4fb5ada518a237311774b32891179bf1fad0a0baad8a58",
+          "engine": "d625ed4aec3e4cd745f2ebd5138d9f6177c187f53cf6fe613d258a952d99a744",
           "manifest": "38e64faa733ac8412b0a1cabec5357be229852f19b432f2f215a7bf20f3a2780",
           "ml4t_runner": "6e9753811241863f59fc6607f315237aa1caec673372ef3b3a85fc959cf426e0",
           "profile": "3b0720d05e9e5869aa6f01432d17918e2db8c0d80810310e6c39c8bf82d1aee0",
@@ -3022,7 +3022,7 @@
         },
         "input_digest": "02743db0d03a02ec414e579929e5e4729b5f99124ab2a41bb234adf93626f62a",
         "ml4t": {
-          "commit": "da6a17f81729c7f3c38483b7e9aeaf8e7f4e10ad",
+          "commit": "ad894ce99d385c654db3864442404b01337396bf",
           "dirty": false
         },
         "python": {
@@ -3179,7 +3179,7 @@
         "scenario_id": "04"
       },
       "detail": null,
-      "duration_seconds": 2.342229423986282,
+      "duration_seconds": 2.660433521028608,
       "framework": "vectorbt_pro",
       "framework_result": {
         "capabilities": {
@@ -3327,7 +3327,7 @@
           "canonical_records": "fa1d9846bdc895cf62e6435097a8953d131ac16f6ae910d41ba81a5090c43707",
           "capabilities": "dd0f50965982db8aae711f850740fc1d26c5f09d8b7c3d24221b347a7e14c8aa",
           "comparator": "de6683dd96cab7fc9ce005f4651b7de359b8ddfcd6402b543960133ca35b0f5e",
-          "engine": "8011ecdaf90807b4fe4fb5ada518a237311774b32891179bf1fad0a0baad8a58",
+          "engine": "d625ed4aec3e4cd745f2ebd5138d9f6177c187f53cf6fe613d258a952d99a744",
           "manifest": "38e64faa733ac8412b0a1cabec5357be229852f19b432f2f215a7bf20f3a2780",
           "ml4t_runner": "6e9753811241863f59fc6607f315237aa1caec673372ef3b3a85fc959cf426e0",
           "profile": "3b0720d05e9e5869aa6f01432d17918e2db8c0d80810310e6c39c8bf82d1aee0",
@@ -3340,7 +3340,7 @@
         },
         "input_digest": "c013a16b8902a5599e53c27dae34849fcf327b4e89ec69d00c951903578f948a",
         "ml4t": {
-          "commit": "da6a17f81729c7f3c38483b7e9aeaf8e7f4e10ad",
+          "commit": "ad894ce99d385c654db3864442404b01337396bf",
           "dirty": false
         },
         "python": {
@@ -4010,7 +4010,7 @@
         "scenario_id": "05"
       },
       "detail": null,
-      "duration_seconds": 2.32796579200658,
+      "duration_seconds": 2.565845651901327,
       "framework": "vectorbt_pro",
       "framework_result": {
         "capabilities": {
@@ -4671,7 +4671,7 @@
           "canonical_records": "fa1d9846bdc895cf62e6435097a8953d131ac16f6ae910d41ba81a5090c43707",
           "capabilities": "dd0f50965982db8aae711f850740fc1d26c5f09d8b7c3d24221b347a7e14c8aa",
           "comparator": "de6683dd96cab7fc9ce005f4651b7de359b8ddfcd6402b543960133ca35b0f5e",
-          "engine": "8011ecdaf90807b4fe4fb5ada518a237311774b32891179bf1fad0a0baad8a58",
+          "engine": "d625ed4aec3e4cd745f2ebd5138d9f6177c187f53cf6fe613d258a952d99a744",
           "manifest": "38e64faa733ac8412b0a1cabec5357be229852f19b432f2f215a7bf20f3a2780",
           "ml4t_runner": "6e9753811241863f59fc6607f315237aa1caec673372ef3b3a85fc959cf426e0",
           "profile": "4d2cacb23e64dacdbb2eda228691671d3a5d327dbbdd899de310551b244bae54",
@@ -4684,7 +4684,7 @@
         },
         "input_digest": "465e20dbdd050a15410d58b7391e304491566407369632fbda07da88e4cc1cee",
         "ml4t": {
-          "commit": "da6a17f81729c7f3c38483b7e9aeaf8e7f4e10ad",
+          "commit": "ad894ce99d385c654db3864442404b01337396bf",
           "dirty": false
         },
         "python": {
@@ -5354,7 +5354,7 @@
         "scenario_id": "06"
       },
       "detail": null,
-      "duration_seconds": 2.326144679012941,
+      "duration_seconds": 2.5497539880452678,
       "framework": "vectorbt_pro",
       "framework_result": {
         "capabilities": {
@@ -6015,7 +6015,7 @@
           "canonical_records": "fa1d9846bdc895cf62e6435097a8953d131ac16f6ae910d41ba81a5090c43707",
           "capabilities": "dd0f50965982db8aae711f850740fc1d26c5f09d8b7c3d24221b347a7e14c8aa",
           "comparator": "de6683dd96cab7fc9ce005f4651b7de359b8ddfcd6402b543960133ca35b0f5e",
-          "engine": "8011ecdaf90807b4fe4fb5ada518a237311774b32891179bf1fad0a0baad8a58",
+          "engine": "d625ed4aec3e4cd745f2ebd5138d9f6177c187f53cf6fe613d258a952d99a744",
           "manifest": "38e64faa733ac8412b0a1cabec5357be229852f19b432f2f215a7bf20f3a2780",
           "ml4t_runner": "6e9753811241863f59fc6607f315237aa1caec673372ef3b3a85fc959cf426e0",
           "profile": "4d2cacb23e64dacdbb2eda228691671d3a5d327dbbdd899de310551b244bae54",
@@ -6028,7 +6028,7 @@
         },
         "input_digest": "465e20dbdd050a15410d58b7391e304491566407369632fbda07da88e4cc1cee",
         "ml4t": {
-          "commit": "da6a17f81729c7f3c38483b7e9aeaf8e7f4e10ad",
+          "commit": "ad894ce99d385c654db3864442404b01337396bf",
           "dirty": false
         },
         "python": {
@@ -6688,7 +6688,7 @@
         "scenario_id": "07"
       },
       "detail": null,
-      "duration_seconds": 2.3995378440013155,
+      "duration_seconds": 2.6615115329623222,
       "framework": "vectorbt_pro",
       "framework_result": {
         "capabilities": {
@@ -7345,7 +7345,7 @@
           "canonical_records": "fa1d9846bdc895cf62e6435097a8953d131ac16f6ae910d41ba81a5090c43707",
           "capabilities": "dd0f50965982db8aae711f850740fc1d26c5f09d8b7c3d24221b347a7e14c8aa",
           "comparator": "de6683dd96cab7fc9ce005f4651b7de359b8ddfcd6402b543960133ca35b0f5e",
-          "engine": "8011ecdaf90807b4fe4fb5ada518a237311774b32891179bf1fad0a0baad8a58",
+          "engine": "d625ed4aec3e4cd745f2ebd5138d9f6177c187f53cf6fe613d258a952d99a744",
           "manifest": "38e64faa733ac8412b0a1cabec5357be229852f19b432f2f215a7bf20f3a2780",
           "ml4t_runner": "6e9753811241863f59fc6607f315237aa1caec673372ef3b3a85fc959cf426e0",
           "profile": "4d2cacb23e64dacdbb2eda228691671d3a5d327dbbdd899de310551b244bae54",
@@ -7358,7 +7358,7 @@
         },
         "input_digest": "465e20dbdd050a15410d58b7391e304491566407369632fbda07da88e4cc1cee",
         "ml4t": {
-          "commit": "da6a17f81729c7f3c38483b7e9aeaf8e7f4e10ad",
+          "commit": "ad894ce99d385c654db3864442404b01337396bf",
           "dirty": false
         },
         "python": {
@@ -8018,7 +8018,7 @@
         "scenario_id": "08"
       },
       "detail": null,
-      "duration_seconds": 2.3293550700182095,
+      "duration_seconds": 2.6153974760090932,
       "framework": "vectorbt_pro",
       "framework_result": {
         "capabilities": {
@@ -8675,7 +8675,7 @@
           "canonical_records": "fa1d9846bdc895cf62e6435097a8953d131ac16f6ae910d41ba81a5090c43707",
           "capabilities": "dd0f50965982db8aae711f850740fc1d26c5f09d8b7c3d24221b347a7e14c8aa",
           "comparator": "de6683dd96cab7fc9ce005f4651b7de359b8ddfcd6402b543960133ca35b0f5e",
-          "engine": "8011ecdaf90807b4fe4fb5ada518a237311774b32891179bf1fad0a0baad8a58",
+          "engine": "d625ed4aec3e4cd745f2ebd5138d9f6177c187f53cf6fe613d258a952d99a744",
           "manifest": "38e64faa733ac8412b0a1cabec5357be229852f19b432f2f215a7bf20f3a2780",
           "ml4t_runner": "6e9753811241863f59fc6607f315237aa1caec673372ef3b3a85fc959cf426e0",
           "profile": "4d2cacb23e64dacdbb2eda228691671d3a5d327dbbdd899de310551b244bae54",
@@ -8688,7 +8688,7 @@
         },
         "input_digest": "465e20dbdd050a15410d58b7391e304491566407369632fbda07da88e4cc1cee",
         "ml4t": {
-          "commit": "da6a17f81729c7f3c38483b7e9aeaf8e7f4e10ad",
+          "commit": "ad894ce99d385c654db3864442404b01337396bf",
           "dirty": false
         },
         "python": {
@@ -8892,7 +8892,7 @@
         "scenario_id": "09"
       },
       "detail": null,
-      "duration_seconds": 2.354666574014118,
+      "duration_seconds": 2.610970417968929,
       "framework": "vectorbt_pro",
       "framework_result": {
         "capabilities": {
@@ -9093,7 +9093,7 @@
           "canonical_records": "fa1d9846bdc895cf62e6435097a8953d131ac16f6ae910d41ba81a5090c43707",
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@@ -253066,7 +253066,7 @@
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@@ -253314,7 +253314,7 @@
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@@ -253673,7 +253673,7 @@
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@@ -254062,7 +254062,7 @@
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@@ -254266,7 +254266,7 @@
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@@ -254471,7 +254471,7 @@
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@@ -254484,7 +254484,7 @@
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@@ -254631,7 +254631,7 @@
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@@ -254792,7 +254792,7 @@
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@@ -254939,7 +254939,7 @@
         "scenario_id": "14"
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@@ -255100,7 +255100,7 @@
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@@ -255247,7 +255247,7 @@
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@@ -255408,7 +255408,7 @@
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@@ -255783,7 +255783,7 @@
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@@ -256172,7 +256172,7 @@
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@@ -275471,7 +275471,7 @@
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@@ -294784,7 +294784,7 @@
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diff --git a/validation/REAL_STRATEGY_PERFORMANCE.json b/validation/REAL_STRATEGY_PERFORMANCE.json
index 751238b6..b8ed4bf9 100644
--- a/validation/REAL_STRATEGY_PERFORMANCE.json
+++ b/validation/REAL_STRATEGY_PERFORMANCE.json
@@ -1,5 +1,5 @@
 {
-  "correctness_evidence_generated_at": "2026-09-03T08:49:07.253544+00:00",
+  "correctness_evidence_generated_at": "2026-09-11T22:46:21.943835+00:00",
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     "frameworks": {
@@ -101,6 +101,29 @@
   },
   "generated_at": "2026-09-03T11:44:14.344493+00:00",
   "provenance": {
+    "certified_equivalent_sources": [
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+        "correctness_evidence_generated_at": "2026-09-11T22:46:21.943835+00:00",
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diff --git a/validation/REAL_STRATEGY_RESULTS.json b/validation/REAL_STRATEGY_RESULTS.json
index 3574b617..9bc56ad1 100644
--- a/validation/REAL_STRATEGY_RESULTS.json
+++ b/validation/REAL_STRATEGY_RESULTS.json
@@ -20,7 +20,7 @@
       "us_equities_panel": "session date"
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@@ -131,9 +131,9 @@
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@@ -142,13 +142,13 @@
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@@ -209,13 +209,13 @@
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-        "ml4t_manifest_sha256": "221770999a977794efd2a1e6de71a03c87221a354a1c029bc6ce72d616d82f84"
+        "framework_manifest_sha256": "680e6d9325a37c3cf97393d13abd9aa3f65b491c612019ff1c4e6885c7411f68",
+        "ml4t_manifest_sha256": "f231c0d6b2f7fda14f9752a456c59e432b8ce2f7b5b2f8d32e850b93c36792b6"
       },
       "excluded_surfaces": {
         "accepted_unfilled_orders": "not exposed by every native runner",
@@ -276,13 +276,13 @@
     {
       "case_study": "etfs",
       "engine_seconds": {
-        "framework": 9.567347406991757,
-        "ml4t": 0.43341725901700556,
+        "framework": 9.993650824995711,
+        "ml4t": 0.5129125780658796,
         "single_run_diagnostic_only": true
       },
       "evidence": {
-        "framework_manifest_sha256": "654d066d4cc1b50136dbc3fe06eb78c3dce65383222565d3eb677426a8c4c158",
-        "ml4t_manifest_sha256": "6b718de06133256c306073004c841f2338910c5a95ab79a7671a2e60c99cdc44"
+        "framework_manifest_sha256": "bd3ce46da458b35e2c4475611faf5d3c719ce04d6282836fa2948c3090fa7098",
+        "ml4t_manifest_sha256": "a5dcd9295eb7549f0174ff810287629b061697a4f20589e459f9da807eb567d8"
       },
       "excluded_surfaces": {
         "accepted_unfilled_orders": "not exposed by every native runner",
@@ -353,13 +353,13 @@
     {
       "case_study": "etfs",
       "engine_seconds": {
-        "framework": 3.8961055990075693,
-        "ml4t": 0.6306074580061249,
+        "framework": 4.682450512074865,
+        "ml4t": 0.6615081509808078,
         "single_run_diagnostic_only": true
       },
       "evidence": {
-        "framework_manifest_sha256": "13135a0a4bb53b7406ffd6eed2184dd918f30006a82bf14748bf0c152dd6da52",
-        "ml4t_manifest_sha256": "ce6aaacbab44ff605e8ae81749cdfcd63fff21d7028df2eb3628b599c8322a8d"
+        "framework_manifest_sha256": "018095ebc6d892aee616a5c2631ee755620f769ea27101e6cc5a925aabb1e3b2",
+        "ml4t_manifest_sha256": "9e1155496cdb2f95a7760640758b18249f2b79f0effcbd4b436fae696e923dc1"
       },
       "excluded_surfaces": {
         "accepted_unfilled_orders": "not exposed by every native runner",
@@ -420,13 +420,13 @@
     {
       "case_study": "etfs",
       "engine_seconds": {
-        "framework": 2.5495394140016288,
-        "ml4t": 0.752860133012291,
+        "framework": 3.488770351978019,
+        "ml4t": 0.7763206900563091,
         "single_run_diagnostic_only": true
       },
       "evidence": {
-        "framework_manifest_sha256": "780b8499c17d5288ba1a230faff90ecfa5113accd7b026da67c3b0ff1639e482",
-        "ml4t_manifest_sha256": "76e6db92bc01027184e643a08f10e065f69db7cde110ec9886fda9fda39a6f18"
+        "framework_manifest_sha256": "7447860b53804f8087287e392518a844b930e3c7ca99573cbc499272ddc3fe51",
+        "ml4t_manifest_sha256": "15cb2ea08fd706f33f7d4599086e0f274a2cdac625012828f4311c75a0c91e68"
       },
       "excluded_surfaces": {
         "accepted_unfilled_orders": "not exposed by every native runner",
@@ -515,13 +515,13 @@
     {
       "case_study": "cme_futures",
       "engine_seconds": {
-        "framework": 0.29124500902253203,
-        "ml4t": 0.4371877209923696,
+        "framework": 0.4756076470948756,
+        "ml4t": 0.4298574000131339,
         "single_run_diagnostic_only": true
       },
       "evidence": {
-        "framework_manifest_sha256": "66d8843547d2246ee43d7b7013cb1c770b8d1ffbde9600c6ff9672a0b2c1dc15",
-        "ml4t_manifest_sha256": "60447511e22cfd0968293896354c99e567d96811cf79cae5d143d98660af1f44"
+        "framework_manifest_sha256": "da48a1be4da6940ff32f7ebbd93f349264971b929407f631f816a777f6e6d739",
+        "ml4t_manifest_sha256": "d4d3651a95ab787c5de6b57759a8556770a70327598e80284e236d214b67c954"
       },
       "excluded_surfaces": {
         "accepted_unfilled_orders": "not exposed by every native runner",
@@ -589,13 +589,13 @@
     {
       "case_study": "cme_futures",
       "engine_seconds": {
-        "framework": 2.491884315997595,
-        "ml4t": 0.43495537401759066,
+        "framework": 2.7772579879965633,
+        "ml4t": 0.42601470195222646,
         "single_run_diagnostic_only": true
       },
       "evidence": {
-        "framework_manifest_sha256": "5ebb42fea2f5aa01c925a1704bbbbe34958b7abfb8020d1916a6e655763f1d13",
-        "ml4t_manifest_sha256": "5abce4bd4f5aaab72e84b15806b7a14e182ba4e6f137fa4118b3ced31de85bcb"
+        "framework_manifest_sha256": "c28f8f5c3b2ac6b5ac128773bdff1fbff3ea80619711201ae8f5c51916c89209",
+        "ml4t_manifest_sha256": "b7241cdbc062badff715a05960412ee28d868bce3ef27c6cde630d67ab44c37c"
       },
       "excluded_surfaces": {
         "accepted_unfilled_orders": "not exposed by every native runner",
@@ -708,13 +708,13 @@
     {
       "case_study": "crypto_perps_funding",
       "engine_seconds": {
-        "framework": 3.0392050269874744,
-        "ml4t": 0.6507594909926411,
+        "framework": 3.37234343693126,
+        "ml4t": 0.7157074479619041,
         "single_run_diagnostic_only": true
       },
       "evidence": {
-        "framework_manifest_sha256": "04467d184613000d092fc1ad99e5a702c19e41991af7fdfa2bb6b49e7f52ae3d",
-        "ml4t_manifest_sha256": "9c69bbab2c7e5d8e0efeb377513f3b959dd8ef4c78ae21b71abe8ed18803147f"
+        "framework_manifest_sha256": "34a866d0cf62934e2bf55d5f95cb8433ce8fac6adbe27134118f00a92fdbb67b",
+        "ml4t_manifest_sha256": "36e3fe6c6f1032f250b8a88b73802cc0f17a6b18d697e61c23b753daf573becb"
       },
       "excluded_surfaces": {
         "accepted_unfilled_orders": "not exposed by every native runner",
@@ -785,13 +785,13 @@
     {
       "case_study": "fx_pairs",
       "engine_seconds": {
-        "framework": 0.3049580640217755,
-        "ml4t": 0.14562974200816825,
+        "framework": 0.3059314200654626,
+        "ml4t": 0.1563084500376135,
         "single_run_diagnostic_only": true
       },
       "evidence": {
-        "framework_manifest_sha256": "c6e1d6f028a3b3d738fc01c4abc86fe1e4a1d870d1b92e08cac2943963717aac",
-        "ml4t_manifest_sha256": "bb044391e332a5337aae1b03e6b12c9ba0178a43e5e2202d80118a5344af3b7e"
+        "framework_manifest_sha256": "05cfb84513893b96ae6ec73fb74afffd1d4e014adb28f48538c1a348d831606f",
+        "ml4t_manifest_sha256": "2dfc4c872fa9f129fbe50f4ad2925dc7acb987b29511ddec5fb7d28a380ea99e"
       },
       "excluded_surfaces": {
         "accepted_unfilled_orders": "not exposed by every native runner",
@@ -852,13 +852,13 @@
     {
       "case_study": "fx_pairs",
       "engine_seconds": {
-        "framework": 0.1423898380016908,
-        "ml4t": 0.14630780401057564,
+        "framework": 0.4655723939649761,
+        "ml4t": 0.15007593005429953,
         "single_run_diagnostic_only": true
       },
       "evidence": {
-        "framework_manifest_sha256": "19e3612592f188f635e7b3a34428ab0eeaa22ff0a2e35c9a09f6a50ef68e5cd7",
-        "ml4t_manifest_sha256": "3bdb2dca5f4a1bbe1743874fa88d225af725ae37d869902d74e2ed4ecb2e3572"
+        "framework_manifest_sha256": "974a7e8bc38677e49442c9508c15fc979f70bb9359009fce92f4f04ebe72ceb5",
+        "ml4t_manifest_sha256": "7090e3b14108edb47f20ceed530561dc0f1729324591b8ce1801f80a4fa58711"
       },
       "excluded_surfaces": {
         "accepted_unfilled_orders": "not exposed by every native runner",
@@ -919,13 +919,13 @@
     {
       "case_study": "fx_pairs",
       "engine_seconds": {
-        "framework": 0.4422051139990799,
-        "ml4t": 0.14514076398336329,
+        "framework": 0.45686943701002747,
+        "ml4t": 0.15635615203063935,
         "single_run_diagnostic_only": true
       },
       "evidence": {
-        "framework_manifest_sha256": "3fa34307453ea92ef77a7db35faedce070ffccdf5fb4e376c7d4d59e20515542",
-        "ml4t_manifest_sha256": "c94b6c91a0a7fbd51667bbe11b6c4af54aed80ca4a4b0a2de7b3b168db27f927"
+        "framework_manifest_sha256": "41d8ea85f9b2ba9c627871ed7694a294f56dbbb62f935d5a5a73b0986ee7afdf",
+        "ml4t_manifest_sha256": "c1e259a2b1e15e77670babdd40d612713841899f06c564f447f0c5948c39a191"
       },
       "excluded_surfaces": {
         "accepted_unfilled_orders": "not exposed by every native runner",
@@ -1003,13 +1003,13 @@
     {
       "case_study": "fx_pairs",
       "engine_seconds": {
-        "framework": 0.9302918569883332,
-        "ml4t": 0.15484036799171008,
+        "framework": 1.00058418198023,
+        "ml4t": 0.16646765102632344,
         "single_run_diagnostic_only": true
       },
       "evidence": {
-        "framework_manifest_sha256": "12ffb861e4148f5a6fec600839274a06cb07f1154c55861194ace80bc1826ae6",
-        "ml4t_manifest_sha256": "3d4efbaa663a46c174b62d54305bb6992fb502069d34fa59361892829d49dc04"
+        "framework_manifest_sha256": "0ed23083be23b61b848b2d00d403796d8350ff3c0b78b29a90946acb69598b1c",
+        "ml4t_manifest_sha256": "851bbebcb4ed3bdff0a54c167a1e82314525aa29bce9c371a25354c5c7bf5e21"
       },
       "excluded_surfaces": {
         "accepted_unfilled_orders": "not exposed by every native runner",
@@ -1080,13 +1080,13 @@
     {
       "case_study": "us_equities_panel",
       "engine_seconds": {
-        "framework": 0.8709365550021175,
-        "ml4t": 21.44294203899335,
+        "framework": 1.102669865009375,
+        "ml4t": 32.63083063904196,
         "single_run_diagnostic_only": true
       },
       "evidence": {
-        "framework_manifest_sha256": "d0d3b064a0b882a603a4ad9f63acbf44cde431800a9ae1f20d37d2abba79cd1b",
-        "ml4t_manifest_sha256": "4f8064def59b07dfca40f49c6525648bcdd50d049d174889e90b711cd69447e5"
+        "framework_manifest_sha256": "ff368caf49eedd518f1d9228953c797d2cd7eef7f677b8c6e3a427f66035e014",
+        "ml4t_manifest_sha256": "324009da3c2377f07a8f8231520a1adb562058b931d459b70d1ff3711ff501bd"
       },
       "excluded_surfaces": {
         "accepted_unfilled_orders": "not exposed by every native runner",
@@ -1147,13 +1147,13 @@
     {
       "case_study": "us_equities_panel",
       "engine_seconds": {
-        "framework": 17.38771830999758,
-        "ml4t": 23.193729941005586,
+        "framework": 18.15394493401982,
+        "ml4t": 33.35302037501242,
         "single_run_diagnostic_only": true
       },
       "evidence": {
-        "framework_manifest_sha256": "86f990d8b00463eda01a067c1306ed23a28b9ea6caed0987ad1419530bd948d5",
-        "ml4t_manifest_sha256": "83336f7174d76e31da9b8dba07cd95d9810b4cc8b79af84ff5ecf4ec4062c8f7"
+        "framework_manifest_sha256": "d992ee459b7b52b03c062ac77b72df1bc8dba4256dfb2d9f10c0b9cc2846f631",
+        "ml4t_manifest_sha256": "146648f720b4d741553ef74fd960e41aef4d2f235a19f4cf0037b24405ca2b24"
       },
       "excluded_surfaces": {
         "accepted_unfilled_orders": "not exposed by every native runner",
@@ -1214,13 +1214,13 @@
     {
       "case_study": "us_equities_panel",
       "engine_seconds": {
-        "framework": 517.1980570319865,
-        "ml4t": 21.387007971992716,
+        "framework": 605.4355918279616,
+        "ml4t": 38.17056172096636,
         "single_run_diagnostic_only": true
       },
       "evidence": {
-        "framework_manifest_sha256": "8a8707350bf7c1f8acd758425968fba613e7f91047ca7c6bbb89fbc8c8b4845e",
-        "ml4t_manifest_sha256": "49f92683c5fdc8ea188cb5131fc3b5d5e1e0db680f7d6b4d3d0cd7c192f50f7e"
+        "framework_manifest_sha256": "1f3d6ff0a52d99cd553b51510a55d1e46a142db8e25f8c9c8c38163da4cc398b",
+        "ml4t_manifest_sha256": "145c156464b407d1bcf5f1afbd7ebac05522e146bc624fc25e995657571be4b0"
       },
       "excluded_surfaces": {
         "accepted_unfilled_orders": "not exposed by every native runner",
@@ -1291,13 +1291,13 @@
     {
       "case_study": "us_equities_panel",
       "engine_seconds": {
-        "framework": 110.22036941099213,
-        "ml4t": 22.05518278098316,
+        "framework": 139.76713411300443,
+        "ml4t": 41.591998734977096,
         "single_run_diagnostic_only": true
       },
       "evidence": {
-        "framework_manifest_sha256": "d857384330265227317aa4e36f7006e909e85de6fe25c2949262267568973626",
-        "ml4t_manifest_sha256": "d4b78b1f34384cbcc5e21f1b95157b145ebb910f25756328675c8ee723a02cef"
+        "framework_manifest_sha256": "47e2f9ba1889a57a6df38d182098ef3e2be8575fb56270f40e4b62c33e53f5cf",
+        "ml4t_manifest_sha256": "3769bdb38b7ac25ae000d0719bae707764696bc80a91502bf390f15bfda46bb2"
       },
       "excluded_surfaces": {
         "accepted_unfilled_orders": "not exposed by every native runner",
@@ -1358,13 +1358,13 @@
     {
       "case_study": "us_equities_panel",
       "engine_seconds": {
-        "framework": 48.258371162984986,
-        "ml4t": 26.53631679501268,
+        "framework": 75.57017008506227,
+        "ml4t": 40.70154203695711,
         "single_run_diagnostic_only": true
       },
       "evidence": {
-        "framework_manifest_sha256": "4cf155744af0ea2ea3dc85059b588871bb0d5df078f7c8c826dac1d2ec94340f",
-        "ml4t_manifest_sha256": "d0235efb0b3f013061d4a31010b2ea933a5a1aa1163ebed6f4ae7fa10db343af"
+        "framework_manifest_sha256": "497e23d8ffd69b00c7d7ad1817b5be6500dcaa8666eb016e9313376d3e58a6e5",
+        "ml4t_manifest_sha256": "f7d893ce989168b4fad41036dbda26c74101c2231db2873e40c9d37a616bec4b"
       },
       "excluded_surfaces": {
         "accepted_unfilled_orders": "not exposed by every native runner",
diff --git a/validation/build_real_strategy_evidence.py b/validation/build_real_strategy_evidence.py
new file mode 100644
index 00000000..61051c61
--- /dev/null
+++ b/validation/build_real_strategy_evidence.py
@@ -0,0 +1,100 @@
+#!/usr/bin/env python3
+"""Produce the retained real-strategy output tree that the comparator reads.
+
+``real_strategy_evidence.py`` compares ``<root>/<case_study>/<framework>`` against
+``<root>/<case_study>/ml4t_<framework>`` but does not produce either, and nothing else in
+``validation/`` did: the one place that invokes every side correctly is
+``real_strategy_benchmark._measure_side``, which writes into a ``TemporaryDirectory`` because
+it only wants the timings. This runs the same invocations once per side into a durable tree,
+so the evidence can be rebuilt after an engine source change instead of by hand.
+
+    uv run python validation/build_real_strategy_evidence.py \
+      --bundle-root PATH/TO/CONTENT_ADDRESSED_BUNDLES \
+      --evidence-root PATH/TO/REAL_STRATEGY_OUTPUTS
+
+Timings are not collected here. One run per side is enough for the comparator and is the wrong
+sample for a published measurement; ``real_strategy_benchmark.py`` remains the only thing that
+reports engine time, and it needs an unloaded machine.
+"""
+
+from __future__ import annotations
+
+import argparse
+import sys
+import tomllib
+from pathlib import Path
+
+VALIDATION_DIR = Path(__file__).resolve().parent
+if str(VALIDATION_DIR) not in sys.path:
+    sys.path.insert(0, str(VALIDATION_DIR))
+
+from real_strategy_benchmark import (  # noqa: E402, I001
+    BUNDLES,
+    VALIDATION_DIR as _BENCHMARK_VALIDATION_DIR,
+    _command,
+    _run_once,
+)
+
+APPLICABILITY_PATH = VALIDATION_DIR / "real_strategy_applicability.toml"
+# The benchmark resolves its own VALIDATION_DIR independently. If the two ever
+# disagree this script would enumerate one applicability file and shell out with
+# paths derived from another, so tie them together here rather than trusting that
+# two `Path(__file__)` expressions in the same directory stay in agreement.
+assert _BENCHMARK_VALIDATION_DIR == VALIDATION_DIR
+
+
+def required_pairs() -> list[tuple[str, str]]:
+    applicability = tomllib.loads(APPLICABILITY_PATH.read_text(encoding="utf-8"))
+    return [
+        (pair["case_study"], pair["framework"])
+        for pair in applicability["pair"]
+        if pair["status"] == "required"
+    ]
+
+
+def build(*, bundle_root: Path, evidence_root: Path) -> int:
+    pairs = required_pairs()
+    for index, (case_study, framework) in enumerate(pairs, start=1):
+        bundle = bundle_root / case_study / BUNDLES[case_study]
+        if not bundle.is_dir():
+            raise FileNotFoundError(f"Bundle missing for {case_study}: {bundle}")
+        for side, directory in (
+            ("framework", evidence_root / case_study / framework),
+            ("ml4t", evidence_root / case_study / f"ml4t_{framework}"),
+        ):
+            directory.parent.mkdir(parents=True, exist_ok=True)
+            command = _command(
+                side=side,
+                case_study=case_study,
+                framework=framework,
+                bundle=bundle,
+                output=directory,
+            )
+            engine_seconds, identity = _run_once(command, directory)
+            print(
+                f"{index}/{len(pairs)} {case_study}/{framework}/{side}: "
+                f"{engine_seconds:.6f}s engine time -> {directory}",
+                flush=True,
+            )
+            if "equity.parquet" not in identity or "fills.parquet" not in identity:
+                raise RuntimeError(
+                    f"{case_study}/{framework}/{side} retained {sorted(identity)}; the "
+                    "comparator needs equity.parquet and fills.parquet"
+                )
+    print(f"Wrote {2 * len(pairs)} sides for {len(pairs)} pairs under {evidence_root}")
+    return 0
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--bundle-root", type=Path, required=True)
+    parser.add_argument("--evidence-root", type=Path, required=True)
+    args = parser.parse_args()
+    return build(
+        bundle_root=args.bundle_root.resolve(),
+        evidence_root=args.evidence_root.resolve(),
+    )
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/validation/real_strategy_benchmark.py b/validation/real_strategy_benchmark.py
index c50f72d5..8b592cb4 100644
--- a/validation/real_strategy_benchmark.py
+++ b/validation/real_strategy_benchmark.py
@@ -279,6 +279,139 @@ def _is_sha256(value: object) -> bool:
     )
 
 
+def certified_sources(provenance: dict[str, Any]) -> dict[str, dict[str, Any]]:
+    """Return the engine sources these timings are certified for, keyed by digest."""
+    entries = provenance.get("certified_equivalent_sources")
+    if not isinstance(entries, list):
+        return {}
+    return {
+        entry["engine_source_sha256"]: entry
+        for entry in entries
+        if isinstance(entry, dict) and _is_sha256(entry.get("engine_source_sha256"))
+    }
+
+
+def source_is_published(provenance: dict[str, Any], current: str) -> bool:
+    """Whether the current engine source is one these timings may be published for.
+
+    The timings are measured under exactly one source tree. That digest lives in
+    `ml4t_engine_source_sha256` and is never rewritten, so the report always says
+    which source produced the numbers. A later source that moves no measured
+    quantity is added to `certified_equivalent_sources` instead of triggering a
+    re-measurement, because re-measuring costs 2h29m of exclusive machine time and
+    cannot change a value that correctness parity has already shown is identical.
+
+    `_tree_digest` hashes every tracked `.py` under the engine, so a docstring edit
+    moves it exactly as far as a rewritten fill model does. Without certification
+    that granularity prices a full benchmark run for any source edit at all.
+    """
+    return current == provenance.get("ml4t_engine_source_sha256") or current in certified_sources(
+        provenance
+    )
+
+
+def runners_are_published(provenance: dict[str, Any], current: dict[str, str]) -> bool:
+    """Whether the current timing runners are ones these timings may be published for.
+
+    Same contract as `source_is_published`, for the adapter and benchmark scripts
+    rather than the engine. Editing this file to add a certification path changes
+    its own digest without touching a single measured number, which is the defect
+    this function exists to stop recurring one level up from the engine.
+    """
+    if current == provenance.get("sources"):
+        return True
+    return any(entry.get("sources") == current for entry in certified_sources(provenance).values())
+
+
+def certification_shape_failures(provenance: dict[str, Any]) -> list[str]:
+    """Return every reason a certification entry cannot be trusted."""
+    entries = provenance.get("certified_equivalent_sources")
+    if entries is None:
+        return []
+    if not isinstance(entries, list):
+        return ["Real-strategy certified_equivalent_sources must be a list"]
+    failures: list[str] = []
+    for index, entry in enumerate(entries):
+        if not isinstance(entry, dict):
+            failures.append(f"Certification {index} is not an object")
+            continue
+        if not _is_sha256(entry.get("engine_source_sha256")):
+            failures.append(f"Certification {index} lacks a valid engine source digest")
+        if not _is_sha256(entry.get("correctness_evidence_sha256")):
+            failures.append(f"Certification {index} lacks the correctness evidence it rests on")
+        for field in ("certified_at", "reason", "ml4t_commit"):
+            value = entry.get(field)
+            if not isinstance(value, str) or not value.strip():
+                failures.append(f"Certification {index} lacks {field}")
+        sources = entry.get("sources")
+        if not isinstance(sources, dict) or not all(
+            _is_sha256(value) for value in sources.values()
+        ):
+            failures.append(f"Certification {index} lacks valid runner source digests")
+        passing = entry.get("correctness_pairs_passed")
+        if not isinstance(passing, int) or isinstance(passing, bool) or passing < 1:
+            failures.append(f"Certification {index} lacks a passing-pair count")
+    return failures
+
+
+def certify_source(
+    report: dict[str, Any],
+    correctness: dict[str, Any],
+    correctness_path: Path,
+    reason: str,
+) -> dict[str, Any]:
+    """Certify the current engine source against timings measured under an older one.
+
+    This never invents a measurement. It records that correctness parity was
+    re-derived under the current source and moved no value, so the published
+    timings stay attributed to the source that produced them while remaining
+    publishable for this one.
+
+    Correctness parity does not by itself prove a source change is performance
+    inert - an added loop can leave every number identical and still cost time.
+    That judgement is the caller's, which is why `reason` is required and stored.
+    """
+    current = _tree_digest(PROJECT_ROOT / "src/ml4t/backtest")
+    provenance = report["provenance"]
+    measured_under = provenance.get("ml4t_engine_source_sha256")
+    if current == measured_under:
+        raise ValueError("Engine source is unchanged; there is nothing to certify")
+    if current in certified_sources(provenance):
+        raise ValueError(f"Engine source {current} is already certified")
+    if not reason.strip():
+        raise ValueError("Certification requires a reason the change cannot move a timing")
+
+    correctness_failures = real_strategy_report_failures(correctness)
+    if correctness_failures:
+        raise ValueError("Correctness evidence is invalid: " + "; ".join(correctness_failures))
+    correctness_digest = correctness["provenance"]["ml4t"]["engine_source_sha256"]
+    if correctness_digest != current:
+        raise ValueError(
+            f"Correctness evidence was produced under engine source {correctness_digest}, "
+            f"not the working tree's {current}; re-derive correctness before certifying"
+        )
+    passing = [record for record in correctness["records"] if record.get("status") == "pass"]
+    if not passing:
+        raise ValueError("Correctness evidence contains no passing pair")
+
+    entry = {
+        "engine_source_sha256": current,
+        "certified_at": datetime.now(UTC).isoformat(),
+        "correctness_evidence_sha256": _sha256(correctness_path),
+        "correctness_evidence_generated_at": correctness["generated_at"],
+        "correctness_pairs_passed": len(passing),
+        "ml4t_commit": correctness["provenance"]["ml4t"]["commit"],
+        "reason": reason.strip(),
+        "sources": {name: _sha256(path) for name, path in TIMING_SOURCE_PATHS.items()},
+    }
+    provenance.setdefault("certified_equivalent_sources", []).append(entry)
+    # The timings are now attested by this correctness run rather than the one they
+    # were measured beside, so the pointer has to move with it or report_failures
+    # reads the evidence as stale. The measured-under digest above does not move.
+    report["correctness_evidence_generated_at"] = correctness["generated_at"]
+    return entry
+
+
 def report_failures(report: dict[str, Any], correctness: dict[str, Any]) -> list[str]:
     """Return every reason real-strategy timing evidence is not publication-safe."""
     failures: list[str] = []
@@ -344,13 +477,21 @@ def report_failures(report: dict[str, Any], correctness: dict[str, Any]) -> list
     if not isinstance(provenance, dict):
         failures.append("Real-strategy performance provenance must be an object")
     else:
-        if provenance.get("ml4t_engine_source_sha256") != _tree_digest(
-            PROJECT_ROOT / "src/ml4t/backtest"
+        certification_failures = certification_shape_failures(provenance)
+        failures.extend(certification_failures)
+        if not certification_failures and not source_is_published(
+            provenance, _tree_digest(PROJECT_ROOT / "src/ml4t/backtest")
         ):
-            failures.append("Real-strategy performance engine source digest is stale")
+            failures.append(
+                "Real-strategy performance engine source is neither the source these "
+                "timings were measured under nor one they are certified for"
+            )
         expected_sources = {name: _sha256(path) for name, path in TIMING_SOURCE_PATHS.items()}
-        if provenance.get("sources") != expected_sources:
-            failures.append("Real-strategy performance runner source digests are stale")
+        if not certification_failures and not runners_are_published(provenance, expected_sources):
+            failures.append(
+                "Real-strategy performance runner sources are neither the runners these "
+                "timings were measured with nor ones they are certified for"
+            )
 
     correctness_records = correctness.get("records")
     if not isinstance(correctness_records, list):
@@ -442,7 +583,27 @@ def main() -> int:
         type=Path,
         default=VALIDATION_DIR / "REAL_STRATEGY_RESULTS.json",
     )
-    parser.add_argument("--bundle-root", type=Path, required=True)
+    parser.add_argument("--bundle-root", type=Path)
+    parser.add_argument(
+        "--performance",
+        type=Path,
+        default=VALIDATION_DIR / "REAL_STRATEGY_PERFORMANCE.json",
+        help="Published timing evidence to certify a new engine source against.",
+    )
+    parser.add_argument(
+        "--certify-source",
+        action="store_true",
+        help=(
+            "Do not benchmark. Record that the current engine source moves no measured "
+            "value, so the published timings stay valid for it. Requires --reason and "
+            "correctness evidence re-derived under the current source."
+        ),
+    )
+    parser.add_argument(
+        "--reason",
+        default="",
+        help="Why the source change cannot move a timing. Stored in the certification.",
+    )
     parser.add_argument(
         "--output",
         type=Path,
@@ -451,6 +612,24 @@ def main() -> int:
     parser.add_argument("--warmups", type=int, default=1)
     parser.add_argument("--samples", type=int, default=10)
     args = parser.parse_args()
+    if args.certify_source:
+        correctness = json.loads(args.correctness.read_text(encoding="utf-8"))
+        report = json.loads(args.performance.read_text(encoding="utf-8"))
+        entry = certify_source(report, correctness, args.correctness, args.reason)
+        failures = report_failures(report, correctness)
+        if failures:
+            raise ValueError("Certified performance evidence is invalid: " + "; ".join(failures))
+        args.performance.write_text(
+            json.dumps(report, indent=2, sort_keys=True) + "\n", encoding="utf-8"
+        )
+        print(
+            f"Certified engine source {entry['engine_source_sha256'][:12]} against timings "
+            f"measured under {report['provenance']['ml4t_engine_source_sha256'][:12]}: "
+            f"{entry['correctness_pairs_passed']} correctness pairs pass, no timing re-measured."
+        )
+        return 0
+    if args.bundle_root is None:
+        raise ValueError("--bundle-root is required unless --certify-source is given")
     if args.warmups < 1 or args.samples < 10:
         raise ValueError("Benchmarks require at least one warmup and ten measured processes")
     correctness = json.loads(args.correctness.read_text(encoding="utf-8"))
diff --git a/validation/release_checks.txt b/validation/release_checks.txt
index 57e433fb..66a386d5 100644
--- a/validation/release_checks.txt
+++ b/validation/release_checks.txt
@@ -24,6 +24,7 @@ validation/common/provenance.py
 validation/large_scale_evidence.py
 validation/real_strategy_corpus.py
 validation/real_strategy_input.py
+validation/build_real_strategy_evidence.py
 validation/real_strategy_benchmark.py
 validation/real_strategy_evidence.py
 validation/real_strategy_runner.py