{
  "manageEntity": {
    "action": "Save",
    "entityId": "509257",
    "entityType": "Track",
    "nonce": "0xb075a1b89b5cd146d23fb8165ccf355fa74b95d43f1e0cd44701871de697c576",
    "signature": "0x031e1c71a8b69f5214f2663a553e4af47d8f54294f39699c9814b853e7f7fffa77f5357c645b22d42eb7cb90f70471a882ec3db4a7a7bd99dd2fba4b5bbe4a9d1c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}