Extrinsic 17308-1

{
  "heartbeat": {
    "blockNumber": 17306,
    "sessionIndex": 288,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x0c8a24691870c44c008cb8dd2621c0d2b120ae6113969a1350c403e1006eb60d6820db5a1e67bb782411df140862d24bb3e3c7cc8b9d435ecb87f7ed80ed1881"
}