Extrinsic 4789-1

{
  "heartbeat": {
    "blockNumber": 4787,
    "sessionIndex": 79,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x48b1bd5eeb286c2bf8748cf16c991d6b8afda06fbe0de94ed039134531f2c66f0bceddc128ad6a167e98387a4784cefc4844b4e1057b9803f0378eb101661186"
}