m.federation

{
  "name": "miner",
  "base": "",
  "fields": [
    {
      "name": "miner",
      "type": "name"
    },
    {
      "name": "last_mine_tx",
      "type": "checksum256"
    },
    {
      "name": "last_mine",
      "type": "time_point_sec"
    },
    {
      "name": "current_land",
      "type": "uint64"
    }
  ]
}