block template for node view
As per Drupal 7 Template (Theme Hook) Suggestions

block--[region|[module|--delta]].tpl.php
base template: block.tpl.php


  Theme hook suggestions are made based on these factors, listed from
  the most specific template to the least. Drupal will use the most
  specific template it finds:


block--module--delta.tpl.php
block--module.tpl.php
block--region.tpl.php