Extrinsic 3346-1

{
  "heartbeat": {
    "blockNumber": 3344,
    "sessionIndex": 55,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x88fde7fc276e51bb7be06416c012b90e4f2ec68227c76ec4a8ffcc172f1cc72c06fb61e0246eb550273c2727b80574309dc1206d4c66e53d5f648b78e2f76e81"
}