Extrinsic 687-1

{
  "heartbeat": {
    "blockNumber": 685,
    "sessionIndex": 11,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0xd0636e06f91dbe057643ace8051b9aa21bfde29ec6387c56c86394bf6736524974dd33e8da2da53536b8c661ce8f1f3b7323e5852d274e160e7d4cd4d7137286"
}