Extrinsic 4469-1

{
  "heartbeat": {
    "blockNumber": 4468,
    "sessionIndex": 74,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0xd8816b9f6db8b3216a3183dd8f67b8e6aeadb239076a847f6f8b0afa13b0b0050f0750d8dda266acc76ee0668c10e6fe68b089f3de4ef59eb84792a78c806d8d"
}