{
  "manageEntity": {
    "action": "Save",
    "entityId": "1415214523",
    "entityType": "Track",
    "nonce": "0x1a4ee47124ed747bf93633427bd8a314e9d046b52356b6ade3450044fd617d93",
    "signature": "0x81d305900a51a7551a8602d2eae0d0ae4c9cb53975bf47e6d91c7db4ff6a75e1276e9c6f5329640a5b8d8a6c69b156ef89c79761916d19fd6adcb2bb0bce2f931c",
    "signer": "0x2F7db4C1AE3922aD0f32CEdED1870278dd17b64b",
    "userId": "467213409"
  }
}