diff --git a/beacon-chain/sync/initial-sync/blocks_fetcher.go b/beacon-chain/sync/initial-sync/blocks_fetcher.go
index 299a0da7eb..658830a9c9 100644
--- a/beacon-chain/sync/initial-sync/blocks_fetcher.go
+++ b/beacon-chain/sync/initial-sync/blocks_fetcher.go
@@ -398,6 +398,7 @@ var errMissingBlobsForBlockCommitments = errors.Wrap(errBlobVerification, "blobs
 var errMismatchedBlobBlockRoot = errors.Wrap(errBlobVerification, "BlockRoot in BlobSidecar does not match the expected root")
 var errMissingBlobIndex = errors.Wrap(errBlobVerification, "missing expected blob index")
 var errMismatchedBlobCommitments = errors.Wrap(errBlobVerification, "commitments at given slot, root and index do not match")
+var errMismatchedProposerIndex = errors.Wrap(errBlobVerification, "proposer index does not match")
 
 func verifyAndPopulateBlobs(bwb []blocks2.BlockWithVerifiedBlobs, blobs []*p2ppb.BlobSidecar, blobWindowStart primitives.Slot) ([]blocks2.BlockWithVerifiedBlobs, error) {
 	// Assumes bwb has already been sorted by sortedBlockWithVerifiedBlobSlice.
@@ -437,6 +438,14 @@ func verifyAndPopulateBlobs(bwb []blocks2.BlockWithVerifiedBlobs, blobs []*p2ppb
 				return nil, errors.Wrapf(errMismatchedBlobBlockRoot,
 					"block root %#x != BlobSidecar.BlockRoot %#x at slot %d", bb.Block.Root(), bl.BlockRoot, block.Slot())
 			}
+			if bytesutil.ToBytes32(bl.BlockParentRoot) != block.ParentRoot() {
+				return nil, errors.Wrapf(errMismatchedBlobBlockRoot,
+					"block parent root %#x != BlobSidecar.BlockParentRoot %#x at slot %d", block.ParentRoot(), bl.BlockParentRoot, block.Slot())
+			}
+			if bl.ProposerIndex != block.ProposerIndex() {
+				return nil, errors.Wrapf(errMismatchedProposerIndex,
+					"block proposer index %d != BlobSidecar.ProposerIndex %d at slot %d", block.ProposerIndex(), bl.ProposerIndex, block.Slot())
+			}
 			if ci != int(bl.Index) {
 				return nil, errors.Wrapf(errMissingBlobIndex,
 					"did not receive blob index %d for block root %#x at slot %d", ci, bb.Block.Root(), block.Slot())
diff --git a/beacon-chain/sync/initial-sync/blocks_fetcher_test.go b/beacon-chain/sync/initial-sync/blocks_fetcher_test.go
index d836642a8b..ad8bcae128 100644
--- a/beacon-chain/sync/initial-sync/blocks_fetcher_test.go
+++ b/beacon-chain/sync/initial-sync/blocks_fetcher_test.go
@@ -1091,6 +1091,16 @@ func TestVerifyAndPopulateBlobs(t *testing.T) {
 	_, err = verifyAndPopulateBlobs(bwb, blobs, firstBlockSlot)
 	require.ErrorIs(t, err, errMissingBlobIndex)
 
+	bwb, blobs = testSequenceBlockWithBlob(t, 10)
+	blobs[lastBlobIdx].ProposerIndex = 100
+	_, err = verifyAndPopulateBlobs(bwb, blobs, firstBlockSlot)
+	require.ErrorIs(t, err, errMismatchedProposerIndex)
+
+	bwb, blobs = testSequenceBlockWithBlob(t, 10)
+	blobs[lastBlobIdx].BlockParentRoot = blobs[0].BlockParentRoot
+	_, err = verifyAndPopulateBlobs(bwb, blobs, firstBlockSlot)
+	require.ErrorIs(t, err, errMismatchedBlobBlockRoot)
+
 	var emptyKzg [48]byte
 	bwb, blobs = testSequenceBlockWithBlob(t, 10)
 	blobs[lastBlobIdx].KzgCommitment = emptyKzg[:]