{
  "manageEntity": {
    "action": "Save",
    "entityId": "221357021",
    "entityType": "Track",
    "nonce": "0x80a2af3bb51dd7f93ceb65dfdf977e0351570c947ff40b1369912c2a095b8dd2",
    "signature": "0x3b6ba107f36bb3a71b76820c87165da286e1fb8ec138a956ad0c3dd5f734be3016743045c3a2c41208a79a9f9ad006b870e6de78ed42d8ab5439bf48c1516c161c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}