diff --git a/build.gradle.kts b/build.gradle.kts
index 854d953..f598564 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -8,7 +8,7 @@ plugins {
 }
 
 group = "net.sergeych"
-version = "0.5.1-SNAPSHOT"
+version = "0.5.2-SNAPSHOT"
 
 repositories {
     mavenCentral()
@@ -52,7 +52,7 @@ kotlin {
                 implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.8.1")
                 implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.7.2")
                 api("io.ktor:ktor-client-core:$ktor_version")
-                api("net.sergeych:crypto2:0.7.1+")
+                api("net.sergeych:crypto2:0.7.1-SNAPSHOT")
             }
         }
         val ktorSocketMain by creating {
diff --git a/src/commonMain/kotlin/net/sergeych/kiloparsec/ExceptionWithCode.kt b/src/commonMain/kotlin/net/sergeych/kiloparsec/ExceptionWithCode.kt
new file mode 100644
index 0000000..57b6083
--- /dev/null
+++ b/src/commonMain/kotlin/net/sergeych/kiloparsec/ExceptionWithCode.kt
@@ -0,0 +1,6 @@
+package net.sergeych.kiloparsec
+
+interface ExceptionWithCode {
+    val code: String
+    val message: String?
+}
\ No newline at end of file
diff --git a/src/commonMain/kotlin/net/sergeych/kiloparsec/LocalInterface.kt b/src/commonMain/kotlin/net/sergeych/kiloparsec/LocalInterface.kt
index 23789cb..54facf5 100644
--- a/src/commonMain/kotlin/net/sergeych/kiloparsec/LocalInterface.kt
+++ b/src/commonMain/kotlin/net/sergeych/kiloparsec/LocalInterface.kt
@@ -106,7 +106,8 @@ open class LocalInterface<S> : Loggable by LogTag("LocalInterface${idCounter.inc
     }
 
     fun getErrorCode(t: Throwable): String? =
-        errorByClass[t::class] ?: errorProviders.firstNonNull { it.getErrorCode(t) }
+        (t as? ExceptionWithCode)?.code
+            ?: errorByClass[t::class] ?: errorProviders.firstNonNull { it.getErrorCode(t) }
 
     fun encodeError(forId: UInt, t: Throwable): Transport.Block.Error =
         if (t is RemoteInterface.ClosedException) {
diff --git a/src/commonMain/kotlin/net/sergeych/kiloparsec/Transport.kt b/src/commonMain/kotlin/net/sergeych/kiloparsec/Transport.kt
index d01baba..62e4b6f 100644
--- a/src/commonMain/kotlin/net/sergeych/kiloparsec/Transport.kt
+++ b/src/commonMain/kotlin/net/sergeych/kiloparsec/Transport.kt
@@ -124,7 +124,7 @@ class Transport<S>(
         }
 
         // now we have mutex freed so we can call:
-        val r = runCatching { device.output.send(pack(b).also { debug { ">>>\n${it.toDump()}" } }) }
+        val r = runCatching { device.output.send(pack(b)) }
         if (!r.isSuccess) {
             r.exceptionOrNull()?.let {
                 exception { "failed to send output block" to it }
@@ -184,10 +184,7 @@ class Transport<S>(
             while (isActive && !isClosed) {
                 try {
                     device.input.receive().let { packed ->
-                        debug { "<<<\n${packed.toDump()}" }
                         val b = unpack<Block>(packed)
-                        debug { "<<$ $b" }
-                        debug { "access state: ${access.isLocked}" }
                         when (b) {
                             is Block.Error -> access.withLock {
                                 val error = localInterface.decodeError(b)
@@ -199,7 +196,7 @@ class Transport<S>(
 
                             is Block.Response -> access.withLock {
                                 calls.remove(b.forId)?.let {
-                                    debug { "activating wait handle for ${b.forId}" }
+//                                    debug { "activating wait handle for ${b.forId}" }
                                     it.complete(b.packedResult)
                                 }
                                     ?: warning { "wait handle not found for ${b.forId}" }
@@ -228,11 +225,10 @@ class Transport<S>(
                                 } catch (t: Throwable) {
                                     send(Block.Error(b.id, "UnknownError", t.message))
                                 }
-                                    .also { debug { "command executed: ${b.name}" } }
                             }
                         }
                     }
-                    debug { "input step performed closed=$isClosed active=$isActive" }
+//                    debug { "input step performed closed=$isClosed active=$isActive" }
                 } catch (_: ClosedSendChannelException) {
                     info { "closed send channel" }
                     isClosed = true
diff --git a/src/jvmMain/kotlin/net/sergeych/kiloparsec/adapter/WebsocketServer.kt b/src/jvmMain/kotlin/net/sergeych/kiloparsec/adapter/WebsocketServer.kt
index 368a5c9..7229027 100644
--- a/src/jvmMain/kotlin/net/sergeych/kiloparsec/adapter/WebsocketServer.kt
+++ b/src/jvmMain/kotlin/net/sergeych/kiloparsec/adapter/WebsocketServer.kt
@@ -10,7 +10,6 @@ import kotlinx.coroutines.channels.ClosedReceiveChannelException
 import kotlinx.coroutines.isActive
 import kotlinx.coroutines.launch
 import net.sergeych.crypto2.SigningKey
-import net.sergeych.crypto2.toDump
 import net.sergeych.kiloparsec.KiloInterface
 import net.sergeych.kiloparsec.KiloServerConnection
 import net.sergeych.kiloparsec.RemoteInterface
@@ -86,9 +85,7 @@ fun <S> Application.setupWebsocketServer(
                 log.debug { "incoming frame: ${f.frameType}" }
                 if (f is Frame.Binary)
                     try {
-                        input.send(f.readBytes().toUByteArray().also {
-                            log.debug { "in frame\n${it.toDump()}" }
-                        })
+                        input.send(f.readBytes().toUByteArray())
                     } catch (_: RemoteInterface.ClosedException) {
                         log.warning { "caught local closed exception (strange!), closing" }
                         break