diff --git a/src/main/scala/lc/core/models.scala b/src/main/scala/lc/core/models.scala
index 83835a2..b06a1aa 100644
--- a/src/main/scala/lc/core/models.scala
+++ b/src/main/scala/lc/core/models.scala
@@ -1,13 +1,16 @@
 package lc.core
 
-sealed trait ChallengeResult
+import org.json4s.jackson.Serialization.write
+import lc.core.Config.formats
+
+trait ByteConvert { def toBytes(): Array[Byte] }
 case class Size(height: Int, width: Int)
 case class Parameters(level: String, media: String, input_type: String, size: Option[Size])
-case class Id(id: String) extends ChallengeResult
-case class Image(image: Array[Byte]) extends ChallengeResult
+case class Id(id: String) extends ByteConvert { def toBytes(): Array[Byte] = { write(this).getBytes } }
+case class Image(image: Array[Byte]) extends ByteConvert { def toBytes(): Array[Byte] = { image } }
 case class Answer(answer: String, id: String)
-case class Result(result: String) extends ChallengeResult
-case class Error(message: String) extends ChallengeResult
+case class Success(result: String) extends ByteConvert { def toBytes(): Array[Byte] = { write(this).getBytes } }
+case class Error(message: String) extends ByteConvert { def toBytes(): Array[Byte] = { write(this).getBytes } }
 case class Response(statusCode: Int, message: Array[Byte])
 case class CaptchaConfig(
     name: String,