feat: use latest finalized block

ghost-crab/src/latest_block_manager.rs

@@ -1,5 +1,5 @@
-use alloy::providers::Provider as AlloyProvider;
 use alloy::transports::TransportError;
+use alloy::{eips::BlockNumberOrTag, providers::Provider as AlloyProvider};
 use std::time::{Duration, Instant};
 
 use crate::indexer::rpc_manager::Provider;
@@ -23,7 +23,15 @@ impl LatestBlockManager {
             }
         }
 
-        let block_number = self.provider.get_block_number().await?;
+        let latest_finalized_block = self
+            .provider
+            .get_block_by_number(BlockNumberOrTag::Finalized, false)
+            .await?
+            .ok_or_else(|| TransportError::local_usage_str("Block not found".into()))?;
+
+        let block_number = latest_finalized_block.header.number.ok_or_else(|| {
+            TransportError::local_usage_str("Block number not available in block header".into())
+        })?;
 
         self.block_number = Some(block_number);
         self.last_fetch = Instant::now();