clarify the difference between the two proofs/roots

event-svc/src/event/validator/time.rs

@@ -92,16 +92,19 @@ impl TimeEventValidator {
             .get(&chain_id)
             .ok_or_else(|| eth_rpc::Error::NoChainProvider(chain_id.clone()))?;
 
-        let proof = provider.get_chain_inclusion_proof(event.proof()).await?;
+        let chain_proof = provider.get_chain_inclusion_proof(event.proof()).await?;
 
-        if proof.root_cid != event.proof().root() {
+        // Compare the root CID in the TimeEvent's AnchorProof to the root CID that was actually
+        // included in the transaction onchain.
+        if chain_proof.root_cid != event.proof().root() {
             return Err(eth_rpc::Error::InvalidProof(format!(
-                "the root CID is not in the transaction (root={})",
-                event.proof().root()
+                "the root CID is not in the transaction (anchor proof root={}, blockchain transaction root={})",
+                event.proof().root(),
+                chain_proof.root_cid,
             )));
         }
 
-        Ok(Timestamp(proof.timestamp))
+        Ok(Timestamp(chain_proof.timestamp))
     }
 }