Extrinsic 6643-1

{
  "heartbeat": {
    "blockNumber": 6641,
    "sessionIndex": 110,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x828e162ac1e0d394a5bb6fb684a4f73480d5c9feef31d15a6f6ec711d8731f152f535712a08234ef33a496e03dbab050fc3b76903b909b8e6e88c92e3e62718e"
}