Extrinsic 4174-1

{
  "heartbeat": {
    "blockNumber": 4173,
    "sessionIndex": 69,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x2a6ea44bc4bef1e3da208d838e35c88a01c9c6975ff4a30ca2623564efb91420151c8f54fa7a9914700cb04f74eba07cf24447020cff0f6ec8db7b2e02f8ce8c"
}