{
  "manageEntity": {
    "action": "Save",
    "entityId": "248557",
    "entityType": "Track",
    "nonce": "0x04db557be709e03aafb8049dd7c2dfe6ed7b82b2d8e530f495938293fc5964c4",
    "signature": "0xb9e168444bdac6965478da1dba4a9673a429cff4a883c7d6acdc67de40f7cde62e6185812a3d6ccf46e9bc65d8a389e911259a3bfbabd0e1fd64913b54122dd51c",
    "signer": "0x15B9643abE09bd37C52a5BD1dCF938B05b06cBFB",
    "userId": "370091516"
  }
}