Extrinsic 18041-1

{
  "heartbeat": {
    "blockNumber": 18040,
    "sessionIndex": 300,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0xdc324ce40e43f9ddce0cf9a23f8855d91192022f76554e7fefc90af5f9c4b45dae106ccf31bec88d37e77190c1f6c707119ab5c469c8adea7beb2f167dba108b"
}