Extrinsic 8569-2

{
  "heartbeat": {
    "blockNumber": 8567,
    "sessionIndex": 142,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0xc2323b3774dabc4e17bec52159b1cb8bb64c96aa21885e8506a414934a842a3fb4bbf4a13893c57895c1a7e0cf90cc12dc991a3f2c73e0ff77a545bc4c670281"
}