Extrinsic 20446-1

{
  "heartbeat": {
    "blockNumber": 20445,
    "sessionIndex": 340,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0xfc278eef043ba5c3bdf176db332a52472a5fd08449c63e33e4f3512161d9f12ba8acbfd3aecc5943738e540cdaf1684316d59ffbd1431b60f2d747560aeada8e"
}