{
  "manageEntity": {
    "action": "Save",
    "entityId": "253415552",
    "entityType": "Track",
    "nonce": "0xffc220fd1d390ae2fa437c0dfe3759d3c0fb7f73d790b88b509c13f13c99a9f5",
    "signature": "0x55218c6d49df41167ed73df859820f70db46a900145f6c37ef74fd8be2b54b6a649241fbaeffd573f81f2fe11cb68b0e829166dd472d39513a5ba23290d7956f1c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}