Extrinsic 43421-1

{
  "heartbeat": {
    "blockNumber": 43420,
    "sessionIndex": 723,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x945456f5b69eba77d559b1199c65a51c39aa93a9c8e7570dec225e37231611154549e269e8cb06bd8a8dc90d03fa504f789c41c43da27ebf94ea334520f5408d"
}