Extrinsic 22521-2

{
  "heartbeat": {
    "blockNumber": 22519,
    "sessionIndex": 375,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x88cfeaa44d1b6b4dbae734e1ee3fbc5ec17b77038ade71733401eb0486d54d50755919e7fbbdc6d0250b78d787174e58419296136c075b241cd149a0b9af7082"
}