Extrinsic 1066-1

{
  "heartbeat": {
    "blockNumber": 1065,
    "sessionIndex": 17,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0xeeca6eee5f8b4eb21dc7a21a2bebf46bd5fc4743963c235d7640cb848bb11c5eefe3c5a3f42455ffa9da24a7a319e152c576c0d8deef714e56ca847fc1359788"
}