{
  "size1": 2,
  "size2": 5,
  "root1": "+sVCA+fMaWzw38tCySodnbr3CtnmIfS9jZhmLwDjwSU=",
  "root2": "Tju7H3tHjc/nH7YxYxUZo7yhLJrvyhYSv85ME6hiZNQ=",
  "proof": [],
  "desc": "empty proof",
  "wantErr": true
}