{
  "manageEntity": {
    "action": "Save",
    "entityId": "1588120588",
    "entityType": "Track",
    "nonce": "0xe446f5b5c3f245addf4513507bb0ddf07bdbb53e116042f4423fb0d1f2910424",
    "signature": "0x06ba37daace203d94a21afb96fe114efd68f003e08d55e0b84f4918177d1713275d655ad5b75874b895721fc4c0bca04c071c4af5142f4ae85f907d4f17ec04e1c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}