{
  "manageEntity": {
    "action": "Save",
    "entityId": "456173",
    "entityType": "Track",
    "nonce": "0xc1c208af243a6b1d0b31403746e20339934838192cead6f47ee72b6a5a616706",
    "signature": "0x7454d53f5125a14a03108661c6f255e48bd9e1833f3403bf814a87d57c20b7d94d2a006f480c9087736257c33c5157c38b8d21e20f8dfc4010fe93d9ba3b184e1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}