Extrinsic 19784-1

{
  "heartbeat": {
    "blockNumber": 19782,
    "sessionIndex": 329,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x600b1ac12f89b83d57ae22c5bf165abbe2ebc633c29492e6f1fd6fe20dd5e7209a3fae75894d48555b035eea5694427ad0fd1fc7f7b1984778bef0f3a1468b89"
}