Extrinsic 20980-1

{
  "heartbeat": {
    "blockNumber": 20979,
    "sessionIndex": 349,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x92e3efceb4f2ef9aee5b6677a21df2520f1444a44e395f8782040946a213391751a3916e8d0d51a81c28c87b9541f732f29c5ce9808b6f6429c76d4479d8a28a"
}