code: def genesis_block_load(module_path=None):
      
      if os.environ.get('BLOCKSTACK_GENESIS_BLOCK_PATH') is not None:
          log.warning('Using envar-given genesis block')
          module_path = os.environ['BLOCKSTACK_GENESIS_BLOCK_PATH']
  
      genesis_block = None
      genesis_block_stages = None
  
      if module_path:
          log.debug('Load genesis block from {}'.format(module_path))
          genesis_block_path = module_path
          try:
              genesis_block_mod = imp.load_source('genesis_block', genesis_block_path)
              genesis_block = genesis_block_mod.GENESIS_BLOCK
              genesis_block_stages = genesis_block_mod.GENESIS_BLOCK_STAGES
  
              if BLOCKSTACK_TEST:
                  print ''
                  print 'genesis block'
                  print json.dumps(genesis_block, indent=4, sort_keys=True)
                  print ''
  
          except Exception as e:
              log.exception(e)
              log.fatal('Failed to load genesis block')
              os.abort()
  
      else:
          log.debug('Load built-in genesis block')
          genesis_block = get_genesis_block()
          genesis_block_stages = get_genesis_block_stages()
  
      try:
          for stage in genesis_block_stages:
              jsonschema.validate(GENESIS_BLOCK_SCHEMA, stage)
  
          jsonschema.validate(GENESIS_BLOCK_SCHEMA, genesis_block)
  
          set_genesis_block(genesis_block)
          set_genesis_block_stages(genesis_block_stages)
  
          log.debug('Genesis block has {} stages'.format(len(genesis_block_stages)))
          for i, stage in enumerate(genesis_block_stages):
              log.debug('Stage {} has {} row(s)'.format(i+1, len(stage['rows'])))
  
      except Exception as e:
          log.fatal("Invalid genesis block")
          os.abort()
  
      return True
docs: Make sure the genesis block is good to go.
      Load and instantiate it.