Extrinsic 18685-1

{
  "heartbeat": {
    "blockNumber": 18683,
    "sessionIndex": 311,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x02ca3d1d3b8c7f04e6154075eb1abf0ce70b292d2998724a2b1fd69046b6763e1e462ccbe6062f5cec4c40fbd41fd51583cf019f00c5c8cc6e869215de795387"
}