Extrinsic 19393-1

{
  "heartbeat": {
    "blockNumber": 19392,
    "sessionIndex": 323,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0xa4788e2c72901c185e0133b7c7408482d633348b740e1463e100f56d2a641a41c6575588d08e61875c8a4dcc3f84ac7a377a6f3c8bb0aa22ac2ccc8b117d598e"
}