{
  "manageEntity": {
    "action": "Save",
    "entityId": "1491065882",
    "entityType": "Track",
    "nonce": "0xb81761b7790b81ae5594073846b1fdee14a5d49be221e3870f64f4743bc449a3",
    "signature": "0xaedab7246a9e4ad750376707fe0f3bea9a90166856803456f4a5f94c13b9959b361f7f11d2d80369948efdafc8af48b531c110f683c1f791b608dd469f6d21a31c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}