Extrinsic 3643-1

{
  "heartbeat": {
    "blockNumber": 3641,
    "sessionIndex": 60,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x965719da7e8c452206b35e9f0f73ab0d383f17218532bab7acc4d9ee27ee1176327213ade266dcee4f9d6e47ee3baf6b0ad698a21770432343c5a7f366289881"
}