code: def mk_genesis(accounts, initial_alloc=denoms.ether * 100000000):
      
      genesis = GENESIS_STUB.copy()
      genesis['extraData'] = encode_hex(CLUSTER_NAME)
      genesis['alloc'].update({
          account: {
              'balance': str(initial_alloc),
          }
          for account in accounts
      })
      # add the one-privatekey account ("1" * 64) for convenience
      genesis['alloc']['19e7e376e7c213b7e7e7e46cc70a5dd086daff2a'] = dict(balance=str(initial_alloc))
      return genesis
docs: Create a genesis-block dict with allocation for all `accounts`.
  
      :param accounts: list of account addresses (hex)
      :param initial_alloc: the amount to allocate for the `accounts`
      :return: genesis dict