{
  "manageEntity": {
    "action": "Save",
    "entityId": "251920",
    "entityType": "Track",
    "nonce": "0x28efb7d629208d4ce39cea3c41b50a3913ddcf645e7fcbf2dbb25879d892d1e6",
    "signature": "0x7385ca723c306ad4c35c3854510b9e978d67e8f6dc02c3683486f934bf48759c728d2ca477268844d7e3d1a6517a214ec492f57cfad98543342566d265bca1d91b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}