diff --git a/EnvelopeGenerator.Application/EnvelopeGeneratorExtensions.cs b/EnvelopeGenerator.Application/EnvelopeGeneratorExtensions.cs
index b2a7475c..51daee31 100644
--- a/EnvelopeGenerator.Application/EnvelopeGeneratorExtensions.cs
+++ b/EnvelopeGenerator.Application/EnvelopeGeneratorExtensions.cs
@@ -1,5 +1,4 @@
 using Microsoft.Extensions.Logging;
-using System.Security.Cryptography;
 using System.Text;
 
 namespace EnvelopeGenerator.Application
@@ -81,13 +80,23 @@ namespace EnvelopeGenerator.Application
             return true;
         }
 
-        public static EncodeType GetEncodeType(string[] decoded) => decoded.Length switch
+        public static EncodeType GetEncodeType(this string[] decoded) => decoded.Length switch
         {
             2 => EncodeType.EnvelopeReceiver,
-            3 => EncodeType.ReadOnly,
+            3 => long.TryParse(decoded[1], out var _) ? EncodeType.ReadOnly : EncodeType.Undefined,
             _ => EncodeType.Undefined,
         };
-        
+
+        public static (string? EnvelopeUuid, string? ReceiverSignature) ToEnvelopeReceiverId(this string[] decoded) 
+            => decoded.GetEncodeType() == EncodeType.EnvelopeReceiver
+            ? (EnvelopeUuid: decoded[0], ReceiverSignature: decoded[1])
+            : throw new InvalidOperationException("Attempted to convert a decoded other than type EnvelopeReceiver to EnvelopeReceiver. ");
+
+        public static long ToReadOnlyId(this string[] decoded)
+            => decoded.GetEncodeType() == EncodeType.ReadOnly
+            ? long.Parse(decoded[1])
+            : throw new InvalidOperationException("Attempted to convert a decoded other than type EnvelopeReceiver to EnvelopeReceiver. ");
+
         /// <summary>
         /// Decodes the envelope receiver ID and extracts the envelope UUID and receiver signature.
         /// </summary>