Extrinsic 1179-1

{
  "heartbeat": {
    "blockNumber": 1178,
    "sessionIndex": 19,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x44b8899d8a19fe454e01906ea759c2681c8e9ef1b42686444bb5ce6cca9c257e7018e4157e7edf0e1fa6dbec328a3ad349184f49e0cb6cfcbd7561087314c48b"
}