Extrinsic 693-1

{
  "heartbeat": {
    "blockNumber": 689,
    "sessionIndex": 11,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xfe8e5ae46c9cff144577f0bdb1bfc702c45e3a4d1417ce0d9fd1615dab24a40865dcd3a37eeffddb96bdfb23bc73cc98cfe9d8c9120051cecc48295ff7f6d18a"
}