Extrinsic 16389-1

{
  "heartbeat": {
    "blockNumber": 16387,
    "sessionIndex": 273,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x7c99598b9ba5585f447fed2a22395a97531a6ea745d0327b9fdc8e447bb82707da6643c631be1bb56a4827538e27f9ffc890811cd32ce8e17762f99721b69d81"
}