{
  "manageEntity": {
    "action": "Save",
    "entityId": "999019387",
    "entityType": "Track",
    "nonce": "0x3e1e1630f8f8cdbbfca5065fb3d6721808c25c4643bb2643fd5f7f071cc8ac06",
    "signature": "0xa98bfef22109f01c7888c2fd7d2d38a7265062239d9bf634d974dfd8fb6cf38061bd99e3f6f2a6ca419795057fdfab05b490d4908c16f44ac5803c2fc52d8c771b",
    "signer": "0x2B28feb1CA15953a5a910C4E741698a24e8b3FE9",
    "userId": "887020893"
  }
}