diff --git a/src/BirdsiteLive.Domain/ActivityPubService.cs b/src/BirdsiteLive.Domain/ActivityPubService.cs
index 21ee7fd..bbabf07 100644
--- a/src/BirdsiteLive.Domain/ActivityPubService.cs
+++ b/src/BirdsiteLive.Domain/ActivityPubService.cs
@@ -90,7 +90,7 @@ namespace BirdsiteLive.Domain
             var date = DateTime.UtcNow.ToUniversalTime();
             var httpDate = date.ToString("r");
 
-            var digest = ComputeSha256Hash(json);
+            var digest = _cryptoService.ComputeSha256Hash(json);
 
             var signature = _cryptoService.SignAndGetSignatureHeader(date, actorUrl, targetHost, digest, usedInbox);
 
@@ -113,15 +113,6 @@ namespace BirdsiteLive.Domain
             return response.StatusCode;
         }
 
-        static string ComputeSha256Hash(string rawData)
-        {
-            // Create a SHA256   
-            using (SHA256 sha256Hash = SHA256.Create())
-            {
-                // ComputeHash - returns byte array  
-                byte[] bytes = sha256Hash.ComputeHash(Encoding.UTF8.GetBytes(rawData));
-                return Convert.ToBase64String(bytes);
-            }
-        }
+       
     }
 }
\ No newline at end of file
diff --git a/src/BirdsiteLive.Domain/CryptoService.cs b/src/BirdsiteLive.Domain/CryptoService.cs
index 837922e..01e7d63 100644
--- a/src/BirdsiteLive.Domain/CryptoService.cs
+++ b/src/BirdsiteLive.Domain/CryptoService.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Security.Cryptography;
 using System.Text;
 using BirdsiteLive.Domain.Factories;
 
@@ -8,6 +9,7 @@ namespace BirdsiteLive.Domain
     {
         string GetUserPem(string id);
         string SignAndGetSignatureHeader(DateTime date, string actor, string host, string digest, string inbox);
+        string ComputeSha256Hash(string data);
     }
 
     public class CryptoService : ICryptoService
@@ -49,5 +51,16 @@ namespace BirdsiteLive.Domain
             var header = "keyId=\"" + actor + "\",algorithm=\"rsa-sha256\",headers=\"(request-target) host date digest\",signature=\"" + sig64 + "\"";
             return header;
         }
+
+        public string ComputeSha256Hash(string data)
+        {
+            // Create a SHA256   
+            using (SHA256 sha256Hash = SHA256.Create())
+            {
+                // ComputeHash - returns byte array  
+                byte[] bytes = sha256Hash.ComputeHash(Encoding.UTF8.GetBytes(data));
+                return Convert.ToBase64String(bytes);
+            }
+        }
     }
 }
\ No newline at end of file
diff --git a/src/BirdsiteLive.Domain/UserService.cs b/src/BirdsiteLive.Domain/UserService.cs
index 1e6e8dc..221ff4f 100644
--- a/src/BirdsiteLive.Domain/UserService.cs
+++ b/src/BirdsiteLive.Domain/UserService.cs
@@ -18,8 +18,8 @@ namespace BirdsiteLive.Domain
     public interface IUserService
     {
         Actor GetUser(TwitterUser twitterUser);
-        Task<bool> FollowRequestedAsync(string signature, string method, string path, string queryString, Dictionary<string, string> requestHeaders, ActivityFollow activity);
-        Task<bool> UndoFollowRequestedAsync(string signature, string method, string path, string queryString, Dictionary<string, string> requestHeaders, ActivityUndoFollow activity);
+        Task<bool> FollowRequestedAsync(string signature, string method, string path, string queryString, Dictionary<string, string> requestHeaders, ActivityFollow activity, string body);
+        Task<bool> UndoFollowRequestedAsync(string signature, string method, string path, string queryString, Dictionary<string, string> requestHeaders, ActivityUndoFollow activity, string body);
     }
 
     public class UserService : IUserService
@@ -79,10 +79,10 @@ namespace BirdsiteLive.Domain
             return user;
         }
 
-        public async Task<bool> FollowRequestedAsync(string signature, string method, string path, string queryString, Dictionary<string, string> requestHeaders, ActivityFollow activity)
+        public async Task<bool> FollowRequestedAsync(string signature, string method, string path, string queryString, Dictionary<string, string> requestHeaders, ActivityFollow activity, string body)
         {
             // Validate
-            var sigValidation = await ValidateSignature(activity.actor, signature, method, path, queryString, requestHeaders);
+            var sigValidation = await ValidateSignature(activity.actor, signature, method, path, queryString, requestHeaders, body);
             if (!sigValidation.SignatureIsValidated) return false;
 
             // Save Follow in DB
@@ -130,10 +130,10 @@ namespace BirdsiteLive.Domain
         }
 
         public async Task<bool> UndoFollowRequestedAsync(string signature, string method, string path, string queryString,
-            Dictionary<string, string> requestHeaders, ActivityUndoFollow activity)
+            Dictionary<string, string> requestHeaders, ActivityUndoFollow activity, string body)
         {
             // Validate
-            var sigValidation = await ValidateSignature(activity.actor, signature, method, path, queryString, requestHeaders);
+            var sigValidation = await ValidateSignature(activity.actor, signature, method, path, queryString, requestHeaders, body);
             if (!sigValidation.SignatureIsValidated) return false;
 
             // Save Follow in DB
@@ -162,8 +162,22 @@ namespace BirdsiteLive.Domain
             return result == HttpStatusCode.Accepted;
         }
 
-        private async Task<SignatureValidationResult> ValidateSignature(string actor, string rawSig, string method, string path, string queryString, Dictionary<string, string> requestHeaders)
+        private async Task<SignatureValidationResult> ValidateSignature(string actor, string rawSig, string method, string path, string queryString, Dictionary<string, string> requestHeaders, string body)
         {
+            //Check Date Validity
+            var date = requestHeaders["date"];
+            var d = DateTime.Parse(date).ToUniversalTime();
+            var now = DateTime.UtcNow;
+            var delta = Math.Abs((d - now).TotalSeconds);
+            if (delta > 30) return new SignatureValidationResult { SignatureIsValidated = false };
+            
+            //Check Digest
+            var digest = requestHeaders["digest"];
+            var digestHash = digest.Split(new [] {"SHA-256="},StringSplitOptions.RemoveEmptyEntries).LastOrDefault();
+            var calculatedDigestHash = _cryptoService.ComputeSha256Hash(body);
+            if (digestHash != calculatedDigestHash) return new SignatureValidationResult { SignatureIsValidated = false };
+
+            //Check Signature
             var signatures = rawSig.Split(',');
             var signature_header = new Dictionary<string, string>();
             foreach (var signature in signatures)
diff --git a/src/BirdsiteLive/BirdsiteLive.csproj b/src/BirdsiteLive/BirdsiteLive.csproj
index 2195422..8b92b7c 100644
--- a/src/BirdsiteLive/BirdsiteLive.csproj
+++ b/src/BirdsiteLive/BirdsiteLive.csproj
@@ -4,6 +4,7 @@
     <TargetFramework>netcoreapp3.1</TargetFramework>
     <UserSecretsId>d21486de-a812-47eb-a419-05682bb68856</UserSecretsId>
     <DockerDefaultTargetOS>Linux</DockerDefaultTargetOS>
+    <Version>0.1.0</Version>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/BirdsiteLive/Controllers/UsersController.cs b/src/BirdsiteLive/Controllers/UsersController.cs
index 0f6d7e3..dd1b081 100644
--- a/src/BirdsiteLive/Controllers/UsersController.cs
+++ b/src/BirdsiteLive/Controllers/UsersController.cs
@@ -111,7 +111,7 @@ namespace BirdsiteLive.Controllers
                     case "Follow":
                         {
                             var succeeded = await _userService.FollowRequestedAsync(signature, r.Method, r.Path,
-                                r.QueryString.ToString(), RequestHeaders(r.Headers), activity as ActivityFollow);
+                                r.QueryString.ToString(), RequestHeaders(r.Headers), activity as ActivityFollow, body);
                             if (succeeded) return Accepted();
                             else return Unauthorized();
                         }
@@ -119,7 +119,7 @@ namespace BirdsiteLive.Controllers
                         if (activity is ActivityUndoFollow)
                         {
                             var succeeded = await _userService.UndoFollowRequestedAsync(signature, r.Method, r.Path,
-                                r.QueryString.ToString(), RequestHeaders(r.Headers), activity as ActivityUndoFollow);
+                                r.QueryString.ToString(), RequestHeaders(r.Headers), activity as ActivityUndoFollow, body);
                             if (succeeded) return Accepted();
                             else return Unauthorized();
                         }
diff --git a/src/BirdsiteLive/Controllers/WellKnownController.cs b/src/BirdsiteLive/Controllers/WellKnownController.cs
index 30a6f22..9ac3bb3 100644
--- a/src/BirdsiteLive/Controllers/WellKnownController.cs
+++ b/src/BirdsiteLive/Controllers/WellKnownController.cs
@@ -50,6 +50,8 @@ namespace BirdsiteLive.Controllers
         [Route("/nodeinfo/{id}.json")]
         public IActionResult NodeInfo(string id)
         {
+            var version = System.Reflection.Assembly.GetEntryAssembly().GetName().Version.ToString(3);
+
             if (id == "2.0")
             {
                 var nodeInfo = new NodeInfoV20
@@ -66,7 +68,7 @@ namespace BirdsiteLive.Controllers
                     software = new Software()
                     {
                         name = "birdsitelive",
-                        version = "0.1.0"
+                        version = version
                     },
                     protocols = new[]
                     {
@@ -101,7 +103,7 @@ namespace BirdsiteLive.Controllers
                     software = new SoftwareV21()
                     {
                         name = "birdsitelive",
-                        version = "0.1.0",
+                        version = version,
                         repository = "https://github.com/NicolasConstant/BirdsiteLive"
                     },
                     protocols = new[]
diff --git a/src/BirdsiteLive/Views/Shared/_Layout.cshtml b/src/BirdsiteLive/Views/Shared/_Layout.cshtml
index 633fd0d..5275267 100644
--- a/src/BirdsiteLive/Views/Shared/_Layout.cshtml
+++ b/src/BirdsiteLive/Views/Shared/_Layout.cshtml
@@ -36,11 +36,14 @@
         </main>
     </div>
 
-    <footer class="border-top footer text-muted">
-        <div class="container">
-            <a href="https://github.com/NicolasConstant/BirdsiteLive">Github</a> @*<a asp-area="" asp-controller="Home" asp-action="Privacy">Privacy</a>*@
-        </div>
-    </footer>
+<footer class="border-top footer text-muted">
+    <div class="container">
+
+        <a href="https://github.com/NicolasConstant/BirdsiteLive">Github</a> @*<a asp-area="" asp-controller="Home" asp-action="Privacy">Privacy</a>*@
+
+        <span style="float: right;">BirdsiteLIVE @System.Reflection.Assembly.GetEntryAssembly().GetName().Version.ToString(3)</span>
+    </div>
+</footer>
     <script src="~/lib/jquery/dist/jquery.min.js"></script>
     <script src="~/lib/bootstrap/dist/js/bootstrap.bundle.min.js"></script>
     <script src="~/js/site.js" asp-append-version="true"></script>