Extrinsic 2309-1

{
  "heartbeat": {
    "blockNumber": 2307,
    "sessionIndex": 38,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0xeadbab8b6f17672892227603f75ecb8b8e308bf8fa84470dcb520faa26267a370cec12c8c5515a213df4fbe1206d1839b9c565ef333b05c6804e498ff11a2e8d"
}