Extrinsic 3929-1

{
  "heartbeat": {
    "blockNumber": 3928,
    "sessionIndex": 65,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xcc80c65835013f0c3e36aca1aacf814782da01bd3652203e696e68f1afa2787ba0eca633c4e978aed6bbca3e08686afdc99165958d7e919237b516a82388f08c"
}