{
  "manageEntity": {
    "action": "Save",
    "entityId": "774157672",
    "entityType": "Track",
    "nonce": "0x77580953b6343c6202b2c0e5bad47ee0bc6460c026f74a8b82c8e545cd0435ac",
    "signature": "0xc19db019a6bb13e0002a38093774f079011171ad411c614d223244579c1e6c8e4faffc0ed5c16e57c1f708a2d9d2f6dea1fd8075f6ae140ed180fb43f755fd101c",
    "signer": "0x2B28feb1CA15953a5a910C4E741698a24e8b3FE9",
    "userId": "887020893"
  }
}