Extrinsic 3226-1

{
  "heartbeat": {
    "blockNumber": 3225,
    "sessionIndex": 53,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x866a452828e191075e3389aacedf72331c000c9e28476043f8ff106678f46a071b096a0ba0ead2cccb228d8409bc90271dedbdf6f0117034b4011156c010f88e"
}