anchor.diff:                 %% The identified PoI fields lead to PoI that proves object.
                  ?assertEqual(ok,
                               aec_trees:verify_poi(contracts, ContractId, Contract,
  -                                                 SerializePoiFromFieldsF(Poi11Fields))),
  +                                                 PoiFromFieldsF(Poi11Fields))),
   
                  %% Check that removing a node from PoI makes object inclusion not proved.
                  [{_, Poi11ProofKVs = [_,_|_]}] = %% Hardcoded expectation on test data: at least 2 nodes so able to remove 1 leaving at least a node.
  
positive.code:                lists:foreach(
                   fun(KV) ->
                           BrokenSerializedPoi =
                               SerializePoiFromFieldsF(
                                 poi_fields_update_with(
                                   contracts,
                                   fun([{H, ProofKVs = [_,_|_]}]) ->
  
negative.code:                {ok, Poi11} = ?TEST_MODULE:add_poi(contracts, ContractId, Trees1, Poi1),
                 Poi11Fields = aec_trees:internal_serialize_poi_fields(Poi11),
  
                 PoiFromFieldsF =
                     fun(Fields) ->
                             aec_trees:deserialize_poi(
                               aec_trees:internal_serialize_poi_from_fields(Fields))
  