diff --git a/arbsphere/energi_bridge.py b/arbsphere/energi_bridge.py
index 9da9794..1f5dd17 100644
--- a/arbsphere/energi_bridge.py
+++ b/arbsphere/energi_bridge.py
@@ -40,6 +40,10 @@ class EnergiBridge:
             "legs": list(delta.legs),
             "total_size": float(delta.total_size),
             "delta_id": delta.delta_id,
+            # Extended provenance fields for deterministic replay and auditing
+            "timestamp": getattr(delta, "timestamp", None),
+            "parent_delta_id": getattr(delta, "parent_id", None),
+            "signature": getattr(delta, "signature", None),
         }
 
 
diff --git a/arbsphere/go_registry.py b/arbsphere/go_registry.py
index ae87471..5f4b5ff 100644
--- a/arbsphere/go_registry.py
+++ b/arbsphere/go_registry.py
@@ -12,3 +12,7 @@ class GoCRegistry:
 
     def get_adapter(self, name: str) -> Any:
         return self._registry.get(name)
+
+    def list_adapters(self) -> list:
+        """Return the list of registered adapter names in deterministic order."""
+        return sorted(self._registry.keys())
diff --git a/arbsphere/primitives.py b/arbsphere/primitives.py
index 00ca84f..e723eca 100644
--- a/arbsphere/primitives.py
+++ b/arbsphere/primitives.py
@@ -8,6 +8,10 @@ class LocalArbProblem:
     target_mispricing: float
     liquidity_budget: float
     latency_budget: float
+    # Optional identifiers for cross-system tracing; kept optional to remain
+    # backwards-compatible with tests that instantiate with the original fields.
+    id: str | None = None
+    venue: str | None = None
 
 
 @dataclass