Extrinsic 43720-1

{
  "heartbeat": {
    "blockNumber": 43719,
    "sessionIndex": 728,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x54bf8fcd95cc73c3b8983aa836fc8894353c811c81123df3adb28d6e42be8566d077a135130ea008c668b113257ad463433c2cc0318c8487ea60d19f3e86ee82"
}