Extrinsic 4189-1

{
  "heartbeat": {
    "blockNumber": 4187,
    "sessionIndex": 69,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x06c0558e1c35393529371188af7fa2ad630c0b6c5a57139f4ddda3d2745d260db7ba458dc6964e01bc999ebeb81234ea81ccaf8fcec9614f655cb76b8099538b"
}