public List<DBInput> getDistinctDBIn() {
        if (distinctIn == null) {
            synchronized(this) {
                if (getIn() == null)
                    return null;

                List<DBInput> distinctIn = new ArrayList<DBInput>(getIn().size());

                for (DBInput input : getDBIn()) {

                    if (input == null)
                        continue;

                    if (input.getDBPrevOut() == null) {
                        distinctIn.add(input);
                        continue;
                    }

                    boolean found = false;
                    for (DBInput existing : distinctIn) {

                        if (existing == null || existing.getDBPrevOut() == null)
                            continue;

                        if (existing.getDBPrevOut().getAddress() != null && existing.getDBPrevOut().getAddress().equals(input.getDBPrevOut().getAddress())) {
                            found = true;
                            existing.value += input.getPrevOut().value;
                            break;
                        }
                    }

                    if (!found) {
                        distinctIn.add(input);
                    }
                }

                this.distinctIn = distinctIn;
            }
        }

        return distinctIn;
    }