{
  "manageEntity": {
    "action": "Save",
    "entityId": "403504335",
    "entityType": "Track",
    "nonce": "0x61d4daea00dc4f3c9228128f8fc888c35dbbd44afc69730386e7983d7398ffb9",
    "signature": "0x76b850b00172f7debf7986bf2be739843451a1b9cdf7d6af4809ebaf22f94b24574dd12d1cfc218532c92a55f2eea45102263cc44aa6c50e26a634ecaedcccd91b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}