{
  "manageEntity": {
    "action": "Save",
    "entityId": "1961821551",
    "entityType": "Track",
    "nonce": "0xf89b6aac2b8e9085d2d08719ca978e5fe7abeed1b0a66b1dc5afbd45b15b34ac",
    "signature": "0xaa71c99dfa4fb8727ef69edadc716d778be5f25951c4c9f5326c0e7bff6b7c1e7c79e9245fae6888992e8f337744b5334d929198646a1e4140fe57c9a80570eb1c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}