{
  "manageEntity": {
    "action": "Save",
    "entityId": "1323600807",
    "entityType": "Track",
    "nonce": "0x41245bbbf60c279e2cca0f46c3ee050036fc94d5f1430c51f1d2a113ee479687",
    "signature": "0x1f831363f5c92b70d1eea55acfdf2bcb21b8bef84b2e1d6ea79ead7d1382e4657d433f06719a246003037bd847ac2d8ec69a6223f71c97b5eb34fb8a454a22a91c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}