diff --git a/build.gradle.kts b/build.gradle.kts
index 3b09ca6..ef56ab8 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -7,7 +7,7 @@ plugins {
 }
 
 group = "it.unisannio.assd.untori"
-version = "0.0.1-alpha-2"
+version = "0.0.1-alpha-3"
 
 repositories {
     mavenCentral()
@@ -67,7 +67,7 @@ bintray {
         setLicenses("MIT")
         desc = description
 
-        version.name = "0.0.1-alpha-2"
+        version.name = "0.0.1-alpha-3"
     }
 
 }
diff --git a/src/main/kotlin/it/unisannio/assd/tkn/key/TemporaryContactKey.kt b/src/main/kotlin/it/unisannio/assd/tkn/key/TemporaryContactKey.kt
index 6544e15..d5792ed 100644
--- a/src/main/kotlin/it/unisannio/assd/tkn/key/TemporaryContactKey.kt
+++ b/src/main/kotlin/it/unisannio/assd/tkn/key/TemporaryContactKey.kt
@@ -10,7 +10,7 @@ import java.security.MessageDigest
 
 class TemporaryContactKey private constructor(
     private val key: ByteArray,
-    private val index: Short
+    val index: Short
 ) {
     fun nextTemporaryContactKey(rvk: ReportVerificationKey): TemporaryContactKey {
         val hmac = MessageDigest.getInstance("SHA-256").apply {
diff --git a/src/main/kotlin/it/unisannio/assd/tkn/key/TemporaryContactNumber.kt b/src/main/kotlin/it/unisannio/assd/tkn/key/TemporaryContactNumber.kt
index 52f968d..eaf690a 100644
--- a/src/main/kotlin/it/unisannio/assd/tkn/key/TemporaryContactNumber.kt
+++ b/src/main/kotlin/it/unisannio/assd/tkn/key/TemporaryContactNumber.kt
@@ -10,6 +10,8 @@ class TemporaryContactNumber(
 ) {
     fun toHexString() = number.toHexString()
 
+    override fun toString(): String = toUUID().toString()
+
     fun toUUID(): UUID {
         val byteBuffer = ByteBuffer.wrap(number)
         val high = byteBuffer.long