{
  "manageEntity": {
    "action": "Save",
    "entityId": "593462",
    "entityType": "Track",
    "nonce": "0x49cb85b744f33a6eea1d4bd2d01ae3af62600959aab22eb55ad0dc964b280431",
    "signature": "0xe9334d295e0cb5e3ee421488f8e4f66eb0047cdbfc0a3fb8bce49f3387154509028a6c259ee6489be5ed780ec7cd80fd7e812245f4569659bc4dd8f6e1a0f9c91c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}