Extrinsic 19171-1

{
  "heartbeat": {
    "blockNumber": 19170,
    "sessionIndex": 319,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x748f695d6eaa4200f9edcf7b75dee03290df3737fd2603a63938900513c9ad39abd98e21b215aa311bd315d1fdb41103b419848b44e78cd8083c1730a16eb98e"
}