Extrinsic 8569-1

{
  "heartbeat": {
    "blockNumber": 8567,
    "sessionIndex": 142,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x842d3674b94ea60fe4a47ebdafbadc26fdda68e7385fa547ecb850fe333193668f1262d1090a4bdc40ac747fbadc094b3ed05e271c6b485e65c496a58245fc84"
}