{
  "manageEntity": {
    "action": "Save",
    "entityId": "1213208564",
    "entityType": "Track",
    "nonce": "0xbdd973af54f5d60e5e65623df5b9c5fd50433fa09af08c43decaa7caf676373e",
    "signature": "0x6712a5666d9fea753224119d41cce4dfdb952c9703f6ecb9783778794d4379a36f4015520a9a00383e20c91a11dc45b1db8e73906b66fca6468a815b7bf547ec1c",
    "signer": "0x27204C77Baa4a510c92A96A4ba3661CC53EE568E",
    "userId": "35918963"
  }
}