fix(sidecar): add actual blob gas used to the header

bolt-sidecar/src/api/builder.rs

@@ -168,7 +168,7 @@ where
             meta: Default::default(),
         };
 
-        tracing::info!(elapsed = ?start.elapsed(), %hash, number, "Returning locally built header");
+        tracing::info!(elapsed = ?start.elapsed(), %hash, number, ?versioned_bid, "Returning locally built header");
         Ok(Json(versioned_bid))
     }
 

bolt-sidecar/src/builder/payload_builder.rs

@@ -76,6 +76,7 @@ impl FallbackPayloadBuilder {
 pub struct Context {
     extra_data: Bytes,
     base_fee: u64,
+    blob_gas_used: u64,
     excess_blob_gas: u64,
     prev_randao: B256,
     fee_recipient: Address,
@@ -91,7 +92,6 @@ pub struct Hints {
     pub gas_used: Option<u64>,
     pub receipts_root: Option<B256>,
     pub logs_bloom: Option<Bloom>,
-    pub blob_gas_used: Option<u64>,
     pub state_root: Option<B256>,
     pub block_hash: Option<B256>,
 }
@@ -173,8 +173,13 @@ impl FallbackPayloadBuilder {
             latest_block.header.blob_gas_used.unwrap_or_default(),
         ) as u64;
 
+        let blob_gas_used = transactions
+            .iter()
+            .fold(0, |acc, tx| acc + tx.blob_gas_used().unwrap_or_default());
+
         let ctx = Context {
             base_fee,
+            blob_gas_used,
             excess_blob_gas,
             parent_beacon_block_root,
             prev_randao,
@@ -359,7 +364,6 @@ pub(crate) fn build_header_with_hints_and_context(
     let gas_used = hints.gas_used.unwrap_or_default();
     let receipts_root = hints.receipts_root.unwrap_or_default();
     let logs_bloom = hints.logs_bloom.unwrap_or_default();
-    let blob_gas_used = hints.blob_gas_used.unwrap_or_default();
     let state_root = hints.state_root.unwrap_or_default();
 
     Header {
@@ -379,7 +383,7 @@ pub(crate) fn build_header_with_hints_and_context(
         mix_hash: context.prev_randao,
         nonce: BEACON_NONCE,
         base_fee_per_gas: Some(context.base_fee),
-        blob_gas_used: Some(blob_gas_used),
+        blob_gas_used: Some(context.blob_gas_used),
         excess_blob_gas: Some(context.excess_blob_gas),
         parent_beacon_block_root: Some(context.parent_beacon_block_root),
         extra_data: context.extra_data.clone(),