m.federation

{
  "name": "miner_claim",
  "base": "",
  "fields": [
    {
      "name": "miner",
      "type": "name"
    },
    {
      "name": "amount",
      "type": "asset"
    },
    {
      "name": "timestamp",
      "type": "time_point_sec"
    }
  ]
}