Extrinsic 4535-1

{
  "heartbeat": {
    "blockNumber": 4533,
    "sessionIndex": 75,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x728d6976f24cd5a1c651d1667b8ea9cbe0874d1e8e890687bbe0d2155052d64c489f5113c10e0b587a1347a4a330ba00dd1eda30cfa4a1f589a4fbd7b648c08d"
}