List<BlockPayload> blocks = new ArrayList<BlockPayload>();

        HeaderBlock header = store.readFirst(HeaderBlock.class);
        blocks.add(header);
        verifyTree(header.getRoot(), "", blocks, Long.MAX_VALUE, true);

        Collections.sort(blocks, new Comparator<BlockPayload>() {
            @Override
            public int compare(BlockPayload block, BlockPayload block1) {