Extrinsic 18284-1

{
  "heartbeat": {
    "blockNumber": 18283,
    "sessionIndex": 304,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x466493252714176efcc05c5774a0c42f5f6949f1586ebb53b81e7d89cac9c30caa0b5a6b7d5fd66edcff44197348129c69cd64bebbe5f34b4426d23b58d7378a"
}