Extrinsic 8248-1

{
  "heartbeat": {
    "blockNumber": 8246,
    "sessionIndex": 137,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x4231477a2528c83cd76452068c76f9d97a76bf54d303a00f5cf64af6847e5b73dc041919b3be0e0ef7d0294123ebda1a4cdb91fd1fb6433f9110c4258f11ce8d"
}