Fix ReadStorageAt for 0-prefixed values

op-node/eth/account_proof.go

@@ -15,7 +15,7 @@ import (
 
 type StorageProofEntry struct {
 	Key   common.Hash     `json:"key"`
-	Value hexutil.Bytes   `json:"value"`
+	Value hexutil.Big     `json:"value"`
 	Proof []hexutil.Bytes `json:"proof"`
 }
 

op-node/sources/eth_client.go

@@ -359,7 +359,8 @@ func (s *EthClient) ReadStorageAt(ctx context.Context, address common.Address, s
 	if err := result.Verify(block.Root()); err != nil {
 		return common.Hash{}, fmt.Errorf("failed to verify retrieved proof against state root: %w", err)
 	}
-	return common.BytesToHash(result.StorageProof[0].Value), nil
+	value := big.Int(result.StorageProof[0].Value)
+	return common.BytesToHash((&value).Bytes()), nil
 }
 
 func (s *EthClient) Close() {