{
  "manageEntity": {
    "action": "Save",
    "entityId": "621506",
    "entityType": "Track",
    "nonce": "0xe7a17b7c4c117a2ea1006bfba6727136b22e2a3457843b9f78ad2efd1b6e2ff0",
    "signature": "0x4ff2aade4b83f416a8d1bdd23cacd603cab30c9cabe36dd01ad32566738d80dd06826143ccb640a5c36066a08e5496cb6d8ca5949f098517ece9821a2aaf4da61c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}