Extrinsic 78-1

{
  "heartbeat": {
    "blockNumber": 76,
    "sessionIndex": 1,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x32dbfd39d124f0f1f2b4f6cc4a3b8e50e8c16bb018a367ef2b14dc129b8a6a5b073750f7457a61ff75d1858a9ba4efa844080998531b14958c54909623deca8d"
}