randomoracle

{
  "name": "window",
  "base": "",
  "fields": [
    {
      "name": "round",
      "type": "uint64"
    },
    {
      "name": "prerandom",
      "type": "string"
    },
    {
      "name": "commits",
      "type": "commit[]"
    }
  ]
}