{
  "manageEntity": {
    "action": "Save",
    "entityId": "2146393711",
    "entityType": "Track",
    "nonce": "1787507758094582427",
    "signature": "0xab4e137ebb7082f796258b4ccae58a509c723cd671d8d5cccc394b5e21523a5f79371789b0c92db24f912355ec740abbdb4b2b7a4ef051631f6c44c3476b90f91b",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}