contract2.gm

{
  "name": "gather",
  "base": "",
  "fields": [
    {
      "name": "source_id",
      "type": "uint64"
    },
    {
      "name": "destination_id",
      "type": "uint64"
    },
    {
      "name": "stratum",
      "type": "uint16"
    },
    {
      "name": "quantity",
      "type": "uint32"
    }
  ]
}