Extrinsic 573-1

{
  "heartbeat": {
    "blockNumber": 572,
    "sessionIndex": 9,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0xd8e5193e102baeed3ae0133b40e9460026e192ca7b45f45f09190748b8ad1f14ac730784150db916e6629b94588686f1fe595a6396cae015b33236d2cd73ff8b"
}