Extrinsic 3923-1

{
  "heartbeat": {
    "blockNumber": 3921,
    "sessionIndex": 65,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x8af9e5e937639114165c92dd6a1787cc255abc9a1c272f83c0fff2c33a0ac4518139970cd4f2da3866cf83c0b0909a17ce30ff62d18988ba02f1114c21675d82"
}