{
  "manageEntity": {
    "action": "Save",
    "entityId": "669888",
    "entityType": "Track",
    "nonce": "0x07d64e37ba8fbcb09b4cb1d9a8b55af8f88504cce6059a5318f2968fdda742ec",
    "signature": "0x5c3bf0b169b0a9736487a8c20eb40899c34a65b7c8ce192970cba0c6f4b0736f02fb50032cfa5b06dd538cef8dcd3608ca6a8e3d05e3b1dbd94368471a3ae6251c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}