const params = {from_ball: 'aEU1WiY9FQ9ihv9cKkX/EHWDxYYVaWYs2AL1yxyYZAQ=',to_ball: 'nOqDBwCVHy+bkBSRIgNlzcKR+EXlTC79aA62qT+Lcj0='};client.api.getHashTree(params, function(err, result) {console.log(result);});
{balls: [{unit: 'c2teVop7xa1BmH1LPvytvOKU8HHTrprGWQw+uHlWPHo=',ball: 'ht1QP48paWg5hpjx+Nbd/DSRFT8WlbQKk9+Uum0/tso=',parent_balls: [Array]},{unit: 'tPbC6QLeweGuiGYRPsIhfd0TQWXWASYBJJUPGa9AOfw=',ball: 'ba5wFB+gewdRX6nSpxt6+Nt8PaRen4pLIYg3jC6EvIw=',parent_balls: [Array]},...]}