Extrinsic 19189-1

{
  "heartbeat": {
    "blockNumber": 19187,
    "sessionIndex": 319,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x9a03cbe9034ef000a56db58b1c05c1dcec0d656f068b5bc548bcbfaea184332d4611221c7fc72b219a58dbea1d7326ab5dd0a10eddb3c11fa639222888216b86"
}