Extrinsic 4088-1

{
  "heartbeat": {
    "blockNumber": 4087,
    "sessionIndex": 68,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x9e49ffaecb119657448c5c065ef79226c3b3bdd106740d94eb39392055967e46810ed4b821c05662ac07e23974ca15eb313be871b0aa7561b37a921773fac98b"
}