Extrinsic 18828-2

{
  "heartbeat": {
    "blockNumber": 18827,
    "sessionIndex": 313,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0xfe9b3c74dc976c2bb2b48d624193a392572f8e2da22f705f8b7950472fc2be211ab882782b4de4b1fd22379cb96ddcef1b5ade36f3bc64a3b371bc62caf67d85"
}