Extrinsic 4592-1

{
  "heartbeat": {
    "blockNumber": 4591,
    "sessionIndex": 76,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x3a6bef1425e48cf025ec17229abbaccb8aa4737f1004223f7c9161c961ec574be5591c6051f2a06f146b7d0e8d095ac9daea0f678dc7a481850d14da37364985"
}