{
  "manageEntity": {
    "action": "Save",
    "entityId": "900690254",
    "entityType": "Track",
    "nonce": "0xb3aaa379f17890ac096e894f278c031c213b83c1fb1caea0022bfdb7a67f9e24",
    "signature": "0x63220803725cfe005160703d1cc9dfcb53f93bd8417f8fcf0c27edb3f34e8d7c29c86a48d1fcb75f4ac32fa00007a7b78a6996bc6ce41bdb3d3fa8757c5ee72b1c",
    "signer": "0x2c232E026B83c9880E3133769a08b5951c0b6C75",
    "userId": "713107840"
  }
}