{
  "manageEntity": {
    "action": "Save",
    "entityId": "253548",
    "entityType": "Track",
    "nonce": "0x64bb3a8977293fb8000c7bda4e87b005bd2a6d1e15e0c6a65ab59e8b64159c49",
    "signature": "0x429df3c55c0577311cf0ba5cddd69a68963c435a2d1a3a8854394f38e8d1fa7e7ce8a1badfeb0c0ee7fb41fcd99676473907999085962b39855368b212abcb5f1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}