Extrinsic 19307-1

{
  "heartbeat": {
    "blockNumber": 19306,
    "sessionIndex": 321,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0xf2da6629e8f6e1d5eac1311976d5feb24784d60a72c29b29d6caf130ed27795e70dfc6e4be2b589ad0b76c7588379f3912c775422dbba3162fbb5c819ac56b84"
}