Extrinsic 1188-1

{
  "heartbeat": {
    "blockNumber": 1187,
    "sessionIndex": 19,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0xa8e242dc7be1706e7451d89585ba0e8808019255d5e3c802bdbaaddbcc94242130f9915b45ee67e445f26c93a632b05c783af53fbc4a89aedd9c6923b665318c"
}