Extrinsic 18196-1

{
  "heartbeat": {
    "blockNumber": 18194,
    "sessionIndex": 303,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x50d0e754dda44d16b4a9df3f1a79188511e509acf66ebfefeca165fa12f428140fc3fd831b62c41772f3dedad177b03c067e0fb1217abc52c7372dc10f3a7f8d"
}