Extrinsic 1458-2

{
  "heartbeat": {
    "blockNumber": 1456,
    "sessionIndex": 24,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x28107a12b82de8092fab17d4942f3265ef2c5c952a84565a244d8c5c2084df0deaff053d6263a5f46a60f3aeeb95a6d51f67481b3083711a88db61da23a1708f"
}