Extrinsic 6564-1

{
  "heartbeat": {
    "blockNumber": 6562,
    "sessionIndex": 109,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x483c6ce05093bea8979b68faf4ae44c8a8b9e203fe5147954c595448a75fa926b0a37c1d8ab3fd8ca83e9086071ac2f090800ba175002482f5b42fccae9f3b8b"
}