Extrinsic 3691-1

{
  "heartbeat": {
    "blockNumber": 3689,
    "sessionIndex": 61,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x8003fdf0759fe035effba26ee5255262b95230825c7f84ac2b283508b614dd5bf1f64bf756df08f82f4d2c0ecba9b728cc542c3f0f08229636fcfa053846828d"
}