{
  "manageEntity": {
    "action": "Save",
    "entityId": "280041912",
    "entityType": "Track",
    "nonce": "0x00b8f59b35b3f1a7ba3c0c6b01d7bb649acf0a79a85cdb3e1f1c71280d2b0f1f",
    "signature": "0xa7f6496b74bdca21dbaaf13badaba6842286c452f65192da78209e7e2b03806a7b655d9de7c53fd562fdad4186c85e3bf530fb59e5c5a582a93f4d04dd6a39931c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}