{
  "manageEntity": {
    "action": "Save",
    "entityId": "355135747",
    "entityType": "Track",
    "nonce": "0x474a55e2a124e59e11734bd3f96bee5ad23fb72f94f3d8f5c9d997d1c66c4569",
    "signature": "0x7aeeaf7d93624e5f8da31a883ffc3c3dc8e3395d492efc269429ad7e2d9bd7be7bf3332507cae26ff82789c3a9d36ce939ff4eed80f5bf33da50ce3daf989b911c",
    "signer": "0x38c65d779554649264FD5A23B412Dd6237e675c2",
    "userId": "839739705"
  }
}