Extrinsic 1488-1

{
  "heartbeat": {
    "blockNumber": 1487,
    "sessionIndex": 24,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0xf80a6d5f669802d90751acb63db858c7538858ee3f7a263940c82b215a61ef285bc32de278e5149f68b9c8ecfe8ceb1d91373251a064133bebfd0bcc14367b8f"
}