{
  "manageEntity": {
    "action": "Save",
    "entityId": "1972421560",
    "entityType": "Track",
    "nonce": "0xc351227df6a8300af97b5d8825b889b87e00db1a9bc83a7083823300c3a6095e",
    "signature": "0x722985c4901dd78fbb80fb87a878fdb4de4147845815a50c347df6bfb49e9e225ebfbf5bbe45444b1a970f7a642eed6d8c374f3a4df79f8db45243863b1fb92a1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}