play.mars

{
  "name": "balance",
  "base": "",
  "fields": [
    {
      "name": "user_id",
      "type": "uint64"
    },
    {
      "name": "quantities",
      "type": "asset[]"
    },
    {
      "name": "last_processed_at",
      "type": "uint32"
    }
  ]
}