First pass

beacon_node/http_api/src/block_id.rs

@@ -279,13 +279,14 @@ impl BlockId {
             .get_blobs(&root)
             .map_err(warp_utils::reject::beacon_chain_error)?;
 
+        let max_len = blob_sidecar_list.max_len();
         let blob_sidecar_list_filtered = match indices.indices {
             Some(vec) => {
                 let list = blob_sidecar_list
                     .into_iter()
                     .filter(|blob_sidecar| vec.contains(&blob_sidecar.index))
                     .collect();
-                BlobSidecarList::new(list)
+                BlobSidecarList::new(list, max_len)
                     .map_err(|e| warp_utils::reject::custom_server_error(format!("{:?}", e)))?
             }
             None => blob_sidecar_list,

beacon_node/http_api/src/publish_blocks.rs

@@ -22,7 +22,8 @@ use tree_hash::TreeHash;
 use types::{
     AbstractExecPayload, BeaconBlockRef, BlobSidecarList, BlockImportSource, DataColumnSidecarList,
     DataColumnSubnetId, EthSpec, ExecPayload, ExecutionBlockHash, ForkName, FullPayload,
-    FullPayloadBellatrix, Hash256, SignedBeaconBlock, SignedBlindedBeaconBlock, VariableList,
+    FullPayloadBellatrix, Hash256, RuntimeVariableList, SignedBeaconBlock,
+    SignedBlindedBeaconBlock, VariableList,
 };
 use warp::http::StatusCode;
 use warp::{reply::Response, Rejection, Reply};
@@ -198,7 +199,10 @@ pub async fn publish_block<T: BeaconChainTypes, B: IntoGossipVerifiedBlockConten
             .into_iter()
             .map(|b| b.clone_blob())
             .collect::<Vec<_>>();
-        VariableList::from(blobs)
+        RuntimeVariableList::from_vec(
+            blobs,
+            chain.spec.max_blobs_per_block(block.epoch()) as usize,
+        )
     });
     let data_cols_opt = gossip_verified_data_columns
         .as_ref()