Extrinsic 17888-1

{
  "heartbeat": {
    "blockNumber": 17887,
    "sessionIndex": 298,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x2c8683ed691744a74f35959177832816253b6624ace8928c9d605707595b5d4973edd1cb7daa07488cf03fc5c47e0a2eb74a61f1b344e7e4ab18f6237e7ea48a"
}