Extrinsic 20979-1

{
  "heartbeat": {
    "blockNumber": 20977,
    "sessionIndex": 349,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0xcebb048ff4eefb90f5752e4b5a525cf9ec1eaec28adb7c2868a369c05d50ed27dac92a2441c56b19fdf8b71015abe3dd00bb73d3cdd6b905d792a7a7980b9f82"
}