Extrinsic 3549-1

{
  "heartbeat": {
    "blockNumber": 3547,
    "sessionIndex": 59,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xb0c4038813d2ae724eacf6a1dfd979979e40df7196d3734ea66a23276b823b7cbad57b2bece4cf3d92c5f4fc46972cb8418a09bd51494cbb3e7ff17962cd178e"
}