{
  "manageEntity": {
    "action": "Save",
    "entityId": "978629031",
    "entityType": "Track",
    "nonce": "0xa154a12f9da2bbb5fdce40c1164d217fc49441900a4f938faa069497a191e9fe",
    "signature": "0x1b090e2de405b395174e8b481b6964cddf78a8250717293b57c13bbfc860fd773f70d03e2124d617633da12cb6338e2e4dad9969f6388b9a2553359aae9a45331c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}