{
  "manageEntity": {
    "action": "Save",
    "entityId": "124091269",
    "entityType": "Track",
    "nonce": "0x45bd1fd6829e003c2447fe4cb261cbba3c1cea5d2ccb4fcc848b50929177c51b",
    "signature": "0x38631e78cadc578a8fe8519c700dbe6f95aa94910a52dd78480b5fa6fd6888aa09a61438c3e1247fc7715bb9a76ad5073426f7a21e9dcafe4a6b919d405b24e41c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}