Suppress error on duplicate blobs, track slashable blobs in blob gossip cache

beacon_node/beacon_chain/src/beacon_chain.rs

@@ -406,7 +406,7 @@ pub struct BeaconChain<T: BeaconChainTypes> {
     /// Maintains a record of which validators have proposed blocks for each slot.
     pub observed_block_producers: RwLock<ObservedBlockProducers<T::EthSpec>>,
     /// Maintains a record of blob sidecars seen over the gossip network.
-    pub(crate) observed_blob_sidecars: RwLock<ObservedBlobSidecars<T::EthSpec>>,
+    pub observed_blob_sidecars: RwLock<ObservedBlobSidecars<T::EthSpec>>,
     /// Maintains a record of which validators have submitted voluntary exits.
     pub(crate) observed_voluntary_exits: Mutex<ObservedOperations<SignedVoluntaryExit, T::EthSpec>>,
     /// Maintains a record of which validators we've seen proposer slashings for.

beacon_node/beacon_chain/src/blob_verification.rs

@@ -392,7 +392,7 @@ pub fn validate_blob_sidecar_for_gossip<T: BeaconChainTypes>(
     if chain
         .observed_blob_sidecars
         .read()
-        .is_known(&blob_sidecar)
+        .proposer_is_known(&blob_sidecar)
         .map_err(|e| GossipBlobError::BeaconChainError(e.into()))?
     {
         return Err(GossipBlobError::RepeatBlob {