Extrinsic 19391-1

{
  "heartbeat": {
    "blockNumber": 19390,
    "sessionIndex": 323,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x4eb35ddd6f979ac99bb4968e93d2078e88c6622ac52bfa01c916cb38fd80e3304eac2ac71b5e7ef70f65f91150bdfb5150fa2d7d02db1bac1b6e1fa444f4598d"
}