diff --git a/credentials/src/test/kotlin/web5/sdk/credentials/PresentationDefinitionTest.kt b/credentials/src/test/kotlin/web5/sdk/credentials/PresentationDefinitionTest.kt
index 896324861..c25372903 100644
--- a/credentials/src/test/kotlin/web5/sdk/credentials/PresentationDefinitionTest.kt
+++ b/credentials/src/test/kotlin/web5/sdk/credentials/PresentationDefinitionTest.kt
@@ -7,6 +7,8 @@ import com.fasterxml.jackson.databind.ObjectMapper
 import com.fasterxml.jackson.module.kotlin.registerKotlinModule
 import com.networknt.schema.JsonSchemaFactory
 import com.networknt.schema.SpecVersion
+import org.erdtman.jcs.JsonCanonicalizer
+import org.junit.jupiter.api.Assertions.assertEquals
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.assertDoesNotThrow
 
@@ -45,46 +47,26 @@ class PresentationDefinitionTest {
       )
     )
     val serializedPd = jsonMapper.writeValueAsString(pd)
-    println(serializedPd)
 
     assertThat(serializedPd).contains("input_descriptors")
     assertThat(serializedPd).contains("123")
   }
 
+  @Test
+  fun `serialization is idempotent`(){
+    val pdString = PRESENTATION_DEFINITION.trimIndent()
+    val parsedPd = jsonMapper.readValue(pdString, PresentationDefinitionV2::class.java)
+    val parsedString = jsonMapper.writeValueAsString(parsedPd)
+
+    assertEquals(
+      JsonCanonicalizer(PRESENTATION_DEFINITION).encodedString,
+      JsonCanonicalizer(parsedString).encodedString,
+    )
+  }
+
   @Test
   fun `can deserialize`() {
-    val pdString = """
-      {
-          "id": "398f69f3-a3d4-4fb1-939a-82281671f7e5",
-          "input_descriptors": [
-              {
-                  "id": "0edade78-ed51-44ae-a0fd-5636372c0978",
-                  "constraints": {
-                      "fields": [
-                          {
-                              "path": [
-                                  "${'$'}.issuer"
-                              ],
-                              "filter": {
-                                  "type": "string",
-                                  "const": "did:ion:EiD6Jcwrqb5lFLFWyW59uLizo5lBuChieiqtd0TFN0xsng: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"
-                              }
-                          },
-                          {
-                              "path": [
-                                  "${'$'}.type[*]"
-                              ],
-                              "filter": {
-                                  "type": "string",
-                                  "pattern": "^SanctionCredential${'$'}"
-                              }
-                          }
-                      ]
-                  }
-              }
-          ]
-      }
-    """.trimIndent()
+    val pdString = PRESENTATION_DEFINITION.trimIndent()
 
     assertDoesNotThrow { jsonMapper.readValue(pdString, PresentationDefinitionV2::class.java) }
   }
diff --git a/credentials/src/test/kotlin/web5/sdk/credentials/TestData.kt b/credentials/src/test/kotlin/web5/sdk/credentials/TestData.kt
new file mode 100644
index 000000000..4ca83b13a
--- /dev/null
+++ b/credentials/src/test/kotlin/web5/sdk/credentials/TestData.kt
@@ -0,0 +1,34 @@
+package web5.sdk.credentials
+
+const val PRESENTATION_DEFINITION = """
+      {
+          "id": "398f69f3-a3d4-4fb1-939a-82281671f7e5",
+          "input_descriptors": [
+              {
+                  "id": "0edade78-ed51-44ae-a0fd-5636372c0978",
+                  "constraints": {
+                      "fields": [
+                          {
+                              "path": [
+                                  "${'$'}.issuer"
+                              ],
+                              "filter": {
+                                  "type": "string",
+                                  "const": "did:ion:EiD6Jcwrqb5lFLFWyW59uLizo5lBuChieiqtd0TFN0xsng:eyJkZWx0YSI6eyJwYXRjaGVzIjpbeyJhY3Rpb24iOiJyZXBsYWNlIiwiZG9jdW1lbnQiOnsicHVibGljS2V5cyI6W3siaWQiOiJ6cC1mNnFMTW1EazZCNDFqTFhIXy1kd0xOLW9DS2lTcDJaa19WQ2t4X3ZFIiwicHVibGljS2V5SndrIjp7ImNydiI6InNlY3AyNTZrMSIsImt0eSI6IkVDIiwieCI6IjNmVFk3VXpBaU9VNVpGZ05VVjl3bm5pdEtGQk51RkNPLWxlRXBDVzhHOHMiLCJ5IjoidjJoNlRqTDF0TnYwSDNWb09Fbll0UVBxRHZOVC0wbVdZUUdLTGRSakJ3ayJ9LCJwdXJwb3NlcyI6WyJhdXRoZW50aWNhdGlvbiJdLCJ0eXBlIjoiSnNvbldlYktleTIwMjAifV0sInNlcnZpY2VzIjpbXX19XSwidXBkYXRlQ29tbWl0bWVudCI6IkVpQjk3STI2bmUwdkhXYXduODk1Y1dnVlE0cFF5NmN1OUFlSzV2aW44X3JVeXcifSwic3VmZml4RGF0YSI6eyJkZWx0YUhhc2giOiJFaURqSmlEdm9RekstRl94V05VVzlzMTBUVmlpdEI0Z1JoS09iYlh2S1pwdlNRIiwicmVjb3ZlcnlDb21taXRtZW50IjoiRWlCbEk1NWx6b3JoeE42TVBqUlZtV2ZZY3MxNzNKOFk3S0hTeU5LcmZiTzVfdyJ9fQ"
+                              }
+                          },
+                          {
+                              "path": [
+                                  "${'$'}.type[*]"
+                              ],
+                              "filter": {
+                                  "type": "string",
+                                  "pattern": "^SanctionCredential${'$'}"
+                              }
+                          }
+                      ]
+                  }
+              }
+          ]
+      }
+    """
\ No newline at end of file