anchor.diff:      N2 = aecore_suite_utils:node_name(Dev2),
       {ok, PK1} = get_pubkey(N1),
       ct:log("PK1 = ~p", [PK1]),
  -    {ok, PK2} = get_pubkey(N2),
       {ok, Bal1} = get_balance(N1),
       ct:log("Balance on dev1: ~p", [Bal1]),
       true = (is_integer(Bal1) andalso Bal1 > 0),
  
positive.code: ok({ok, V}) ->
      V.
  
  maps_get(K, #{} = M, Def) when is_function(Def, 0) ->
      case maps:find(K, M) of
          {ok, V} -> V;
          error ->
               Def()
      end.
  
  preblock_second(Config) ->
      [Dev1, Dev2 | _] = proplists:get_value(devs, Config),
      EpochCfg = aecore_suite_utils:epoch_config(Dev1, Config),
  
negative.code:     ok = new_tx(#{node1  => N1,
                    node2  => N2,
                    amount => AmountFun(Bal1),
                    fee    => 1}),
      {ok, Pool12} = get_pool(N1),
      [NewTx] = Pool12 -- Pool11,
  