{
  "manageEntity": {
    "action": "Save",
    "entityId": "957925293",
    "entityType": "Track",
    "nonce": "0x1189e20e0b3d1c33411dceba3344d0b0b1ad6a4772a49741eb31f53f8738beba",
    "signature": "0x4bd9ccd1bbdb47d53e461b971864ef7410748b9557ffd58b5c0afa804ce0cc850be9b9244bba44253a3023a09971fbf0715d5a7f73f082b56e1f8b7c1426d2f31b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}