{
  "manageEntity": {
    "action": "Save",
    "entityId": "384921728",
    "entityType": "Track",
    "nonce": "0xa0161e87317f43e88024ec3081cfce20a23f07380d740e7f0dc634f45b9794d0",
    "signature": "0xbfe06cadb9f4c3db8bc6fd095716fc7f5c6b45b14f46d948d0d96f7e1d594af407ca0ded8c355d76e8817adaaa6a9097df04862fb3ed3d88431f93580fc827d51c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}