Extrinsic 966-1

{
  "heartbeat": {
    "blockNumber": 965,
    "sessionIndex": 16,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x22889c8f1fc009ed698cb9e72d58320a7ef1035fbb85d9200758af5ac609dc4fa6ead1ab79900a1db3b4da06e15f4581f4735e3324e7e34cf33935149999f987"
}