Extrinsic 4238-1

{
  "heartbeat": {
    "blockNumber": 4237,
    "sessionIndex": 70,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0xb030ad426c37d773b3613a8fb9c6f0905505442fd37d5edfce731b0bcade1d2036b4167b758e1270030636f8d99e1347b42577802e6c71d60a40ed6fba419481"
}