Pass the latest active key to the Block's scan function

Effectively necessary for networks on which we utilize account abstraction in
order to know what key to associate the received coins with.

processor/ethereum/src/primitives/block.rs

@@ -59,8 +59,19 @@ impl primitives::Block for FullEpoch {
     self.epoch.end_hash
   }
 
-  fn scan_for_outputs_unordered(&self, _key: Self::Key) -> Vec<Self::Output> {
+  fn scan_for_outputs_unordered(
+    &self,
+    latest_active_key: Self::Key,
+    key: Self::Key,
+  ) -> Vec<Self::Output> {
     // Only return these outputs for the latest key
+    if latest_active_key != key {
+      return vec![];
+    }
+
+    // Associate all outputs with the latest active key
+    // We don't associate these with the current key within the SC as that'll cause outputs to be
+    // marked for forwarding if the SC is delayed to actually rotate
     todo!("TODO")
   }