Extrinsic 2976-1

{
  "heartbeat": {
    "blockNumber": 2974,
    "sessionIndex": 49,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0xc6fd04844955e312ddbbb19319ed9d95858f10bda8edf3e705af7b50ac480d1a9965a8eda3fa7061ecfbeb361c3fdb9af155ef76093aa65033a54b07536a608a"
}