{
  "manageEntity": {
    "action": "Save",
    "entityId": "1593899979",
    "entityType": "Track",
    "nonce": "0x4168610055361a2a264ac204a47786fd4708a368bfe7d7ef4678f20c3e3e884b",
    "signature": "0x8137d8d83141d4dd9da25d89cd090bd51aed49420606ab833f6e33b3f871f99a4b84deed2840bd10ca27d1e03516fffed68dd0ab99a821fe57e105518def1b9a1b",
    "signer": "0x44c6c9974E4028ab550E0311F9A04Df023477958",
    "userId": "152450"
  }
}