{
  "manageEntity": {
    "action": "Save",
    "entityId": "521902290",
    "entityType": "Track",
    "nonce": "0xd5c2011d08fe7234a19a584144d350d634fb30641c8f43ec437ecf7acc8e51af",
    "signature": "0x8f64ab9b7602050d8070216ec7efd952ad23b837affb766d6fd0e2f15596230c103aff14ccf5179950e49b7a40dcebb6341ff60130712887ae5eaf50160ecc331b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}