{
  "manageEntity": {
    "action": "Save",
    "entityId": "752454117",
    "entityType": "Track",
    "nonce": "0x0b3fc42ad26dd7cc95fb9d9ba8839ae711b052f6e56d9212752401b2fa1b7830",
    "signature": "0x020c14b4adbb020152dca4be0025987fdaaea5fc3e9a3ad4095ae9e0f59e07dc162540a4b15808eaf6e5862c5bed55ccc7f89772c29e401312ed3f8e8d90f4f01b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}