diff --git a/jarca_ledger_mcp/application/assets_service.py b/jarca_ledger_mcp/application/assets_service.py
index f067daa..f2ecb7b 100644
--- a/jarca_ledger_mcp/application/assets_service.py
+++ b/jarca_ledger_mcp/application/assets_service.py
@@ -694,7 +694,7 @@ def close_asset_snapshot(basis_date: str = "", source_note: str = "", memo: str
                 except (TypeError, json.JSONDecodeError):
                     stored_fingerprint = {"authority": existing_run["request_fingerprint"], "request": ""}
                 latest_basis_run = conn.execute(
-                    "SELECT id, correction_of_run_id FROM asset_snapshot_runs WHERE basis_date=? ORDER BY rowid DESC LIMIT 1",
+                    "SELECT id, correction_of_run_id, request_fingerprint FROM asset_snapshot_runs WHERE basis_date=? ORDER BY rowid DESC LIMIT 1",
                     (basis,),
                 ).fetchone()
                 run_in_correction_chain = False
@@ -714,9 +714,16 @@ def close_asset_snapshot(basis_date: str = "", source_note: str = "", memo: str
                         if parent_id
                         else None
                     )
+                try:
+                    latest_authority_fingerprint = json.loads(
+                        latest_basis_run["request_fingerprint"]
+                    ).get("authority") if latest_basis_run else None
+                except (TypeError, json.JSONDecodeError, AttributeError):
+                    latest_authority_fingerprint = None
                 immutable_replay_run = bool(
                     run_in_correction_chain
                     and latest_basis_run
+                    and latest_authority_fingerprint == authority_fingerprint
                     and (
                         latest_basis_run["id"] != existing_run["id"]
                         or existing_run["correction_of_run_id"]
diff --git a/tests/test_issue_12_review63_assets.py b/tests/test_issue_12_review63_assets.py
index a2ad2d4..7ad8ba4 100644
--- a/tests/test_issue_12_review63_assets.py
+++ b/tests/test_issue_12_review63_assets.py
@@ -97,22 +97,28 @@ def test_f002_correction_replay_preserves_full_initial_response(tmp_path):
 def test_f006_initial_replay_survives_multiple_later_corrections(tmp_path):
     db_path = str(tmp_path / "ledger.sqlite3")
     service.create_manual_asset(
-        "현금", 100, "2026-06-30", "cash", db_path=db_path
+        "현금 A", 100, "2026-06-30", "cash", db_path=db_path
     )
-    asset_id = service.list_manual_assets(db_path=db_path)["manual_assets"][0]["id"]
+    service.create_manual_asset(
+        "현금 B", 200, "2026-06-30", "cash", db_path=db_path
+    )
+    assets = {
+        item["name"]: item["id"]
+        for item in service.list_manual_assets(db_path=db_path)["manual_assets"]
+    }
     first = service.close_asset_snapshot(
         "2026-06-30", idempotency_key="multi-initial", db_path=db_path
     )
     assert first["success"] is True
 
-    service.update_manual_asset(asset_id, valuation_amount=110, db_path=db_path)
+    service.update_manual_asset(assets["현금 A"], valuation_amount=110, db_path=db_path)
     first_correction = service.close_asset_snapshot(
         "2026-06-30", correction_reason="first correction",
         idempotency_key="multi-correction-1", db_path=db_path,
     )
     assert first_correction["success"] is True
 
-    service.update_manual_asset(asset_id, valuation_amount=120, db_path=db_path)
+    service.update_manual_asset(assets["현금 A"], valuation_amount=120, db_path=db_path)
     second_correction = service.close_asset_snapshot(
         "2026-06-30", correction_reason="second correction",
         idempotency_key="multi-correction-2", db_path=db_path,
@@ -124,6 +130,13 @@ def test_f006_initial_replay_survives_multiple_later_corrections(tmp_path):
     )
     assert replay == first
 
+    service.update_manual_asset(assets["현금 B"], valuation_amount=220, db_path=db_path)
+    drifted_replay = service.close_asset_snapshot(
+        "2026-06-30", idempotency_key="multi-initial", db_path=db_path
+    )
+    assert drifted_replay["success"] is False
+    assert drifted_replay["error_code"] == "idempotency_conflict"
+
 
 def test_f003_zero_row_conditional_runs_are_timeseries_authority_with_aliases(tmp_path):
     db_path = str(tmp_path / "ledger.sqlite3")