Extrinsic 19482-1

{
  "heartbeat": {
    "blockNumber": 19480,
    "sessionIndex": 324,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x18b185fd579670710fa4c8c26207286b1f219e00adc68ac24efb9165b12f97714ab59ce62726a4cc82087ac340acc70d1e50effe99dae68c2b044c2165223380"
}