{
  "manageEntity": {
    "action": "Save",
    "entityId": "758351",
    "entityType": "Track",
    "nonce": "0x4383f5baac3fffef05a0a9f2ad6f49a85fdd968d5a85e644c21c9bf75fe9e312",
    "signature": "0xdc387830066548bc3d31a353d175c78d9f11f16ef778acaaafaca4e2743d701f372b4aecc8801b2debf059225d58751d01d41c8745aa20081d782c61eb3d28101c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}