{
  "manageEntity": {
    "action": "Save",
    "entityId": "549794",
    "entityType": "Track",
    "nonce": "0xf019b30878df03cfc4ab518ac0f54ab532bcb65e161e783cde96fa13e97ae5ba",
    "signature": "0xd265ba38c907722377cb0a592494143a54a38f5c40f468b13280e762613c87175fdbc8d5e5ff8d92edff1522675fa81c6d5ac7756f5e9a9431719de1a8c8373d1b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}