Extrinsic 526-1

{
  "heartbeat": {
    "blockNumber": 522,
    "sessionIndex": 8,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x6aa0abbe7303332179159d74b6715ec2aa4910dcb37388b21f1e0905d6ed9851d5a9f670c982e59d01705bf5c69c3eefe4e3336ce017fe59ac48c53a8cf78886"
}