{
  "manageEntity": {
    "action": "Save",
    "entityId": "145135523",
    "entityType": "Track",
    "nonce": "0x4aa3c3b7b2d5cfa9e2d27948e195e8d85ebb9e2f59481c9fd21e9f3b895c8d46",
    "signature": "0x0abcb966eec082f09d837afa92ca9ceb685fcdf163b3f15d901701ec52887c2d62b4cbe7271881704de7b915db0bc0bab0fccd8d005d6991fe9e558e758cd0bc1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}