Extrinsic 3640-1

{
  "heartbeat": {
    "blockNumber": 3639,
    "sessionIndex": 60,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x50c250c2a2e7fcab368b84e289fd3c3350308e83c36bf8d4c4fcce3f0c7ecd140bf161e5072a36189dc38477303fe75c4410f1f84a72132cab518848aa65f08f"
}