Extrinsic 338-1

{
  "heartbeat": {
    "blockNumber": 337,
    "sessionIndex": 5,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x68c0b860277db2e889fa9909a08a46ed5170cec827fad2c21033b496dab46f0b8814af341373dd886a010e006a768da4a63b4b89eed4a83d8b097d6488680089"
}