{
  "manageEntity": {
    "action": "Save",
    "entityId": "1638356758",
    "entityType": "Track",
    "nonce": "0x3d22d5b31b7fb82f6159cf77b90b7bb3175e792324b5ada3fac3731981c7425e",
    "signature": "0x7c350dee53a6b2621b0f11e0896af57d0b59fbf01962d031fb6b489a4ca0820a393b4ee6f33f442f9a2b9ce5f24b888fcb08ba2cc9052a1aadaf63bc267675b01b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}