diff --git a/EnvelopeGenerator.Application/EnvelopeGeneratorExtensions.cs b/EnvelopeGenerator.Application/EnvelopeGeneratorExtensions.cs
index b5b1c27f..875dad1c 100644
--- a/EnvelopeGenerator.Application/EnvelopeGeneratorExtensions.cs
+++ b/EnvelopeGenerator.Application/EnvelopeGeneratorExtensions.cs
@@ -1,4 +1,5 @@
 using Microsoft.Extensions.Logging;
+using System.Security.Cryptography;
 using System.Text;
 
 namespace EnvelopeGenerator.Application
@@ -88,6 +89,22 @@ namespace EnvelopeGenerator.Application
                 return (string.Empty, string.Empty);
         }
 
+        public static long? DecodeEnvelopeReceiverReadOnlyId(this string envelopeReceiverReadOnlyId)
+        {
+            if (!envelopeReceiverReadOnlyId.IsBase64String())
+            {
+                return null;
+            }
+            byte[] bytes = Convert.FromBase64String(envelopeReceiverReadOnlyId);
+            string decodedString = System.Text.Encoding.UTF8.GetString(bytes);
+            string[] parts = decodedString.Split(new string[] { "::" }, StringSplitOptions.None);
+
+            if (parts.Length > 2)
+                return long.TryParse(parts[1], out long readOnlyId) ? readOnlyId : null;
+            else
+                return null;
+        }
+
         /// <summary>
         /// Gets the envelope UUID from the decoded envelope receiver ID.
         /// </summary>
@@ -111,7 +128,16 @@ namespace EnvelopeGenerator.Application
 			return base64String;
 		}
 
-		public static void LogEnvelopeError(this ILogger logger, string envelopeReceiverId, Exception? exception = null, string? message = null, params object?[] args)
+        public static string EncodeEnvelopeReceiverId(this long readOnlyId)
+        {
+            string combinedString = $"{Random.Shared.Next()}::{readOnlyId}::{Random.Shared.Next()}";
+            byte[] bytes = Encoding.UTF8.GetBytes(combinedString);
+            string base64String = Convert.ToBase64String(bytes);
+
+            return base64String;
+        }
+
+        public static void LogEnvelopeError(this ILogger logger, string envelopeReceiverId, Exception? exception = null, string? message = null, params object?[] args)
         {
             var sb = new StringBuilder().AppendLine(envelopeReceiverId.DecodeEnvelopeReceiverId().ToTitle());
 
diff --git a/EnvelopeGenerator.Web/Controllers/Test/TestEnvelopeReceiverController.cs b/EnvelopeGenerator.Web/Controllers/Test/TestEnvelopeReceiverController.cs
index 592688de..3d69a6f0 100644
--- a/EnvelopeGenerator.Web/Controllers/Test/TestEnvelopeReceiverController.cs
+++ b/EnvelopeGenerator.Web/Controllers/Test/TestEnvelopeReceiverController.cs
@@ -40,13 +40,27 @@ namespace EnvelopeGenerator.Web.Controllers.Test
         }
 
         [HttpGet("decode")]
-        public IActionResult DecodeEnvelopeReceiverId(string envelopeReceiverId)
+        public IActionResult DecodeEnvelopeReceiverId(string envelopeReceiverId, bool isReadOnly = false)
         {
-            var decoded = envelopeReceiverId.DecodeEnvelopeReceiverId();
-            return Ok(new { uuid = decoded.EnvelopeUuid, signature = decoded.ReceiverSignature });
+            if (isReadOnly)
+            {
+                var (Random1, ReadOnlyId, Random2) = envelopeReceiverId.DecodeEnvelopeReceiverReadOnlyId();
+                return Ok(new { random = new string?[] { Random1, Random2 }, readOnlyId = ReadOnlyId });
+            }
+            else
+            {
+                var (EnvelopeUuid, ReceiverSignature) = envelopeReceiverId.DecodeEnvelopeReceiverId();
+                return Ok(new { uuid = EnvelopeUuid, signature = ReceiverSignature });
+            }
         }
 
         [HttpGet("encode")]
-        public IActionResult EncodeEnvelopeReceiverId(string uuid, string signature) => Ok((uuid, signature).EncodeEnvelopeReceiverId());
+        public IActionResult EncodeEnvelopeReceiverId(string? uuid = null, string? signature = null, long? readOnlyId = null)
+        {
+            if(readOnlyId is long readOnlyId_long)
+                return Ok(readOnlyId_long.EncodeEnvelopeReceiverId());
+            else
+                return Ok((uuid ?? string.Empty, signature ?? string.Empty).EncodeEnvelopeReceiverId());
+        }
     }
 }
\ No newline at end of file