Extrinsic 1124-1

{
  "heartbeat": {
    "blockNumber": 1123,
    "sessionIndex": 18,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x76794b2fc8a5ef277b6be0ac8ccbe0b7e8245422dd96454c0c6ee3ad042274461ac134ebda0f0fa29be78d1c69dc01eb1e4e10240d94ee14638b603eaa399484"
}