diff --git a/Svrnty.Sample/Program.cs b/Svrnty.Sample/Program.cs
index ecd5bd3..f77f3ab 100644
--- a/Svrnty.Sample/Program.cs
+++ b/Svrnty.Sample/Program.cs
@@ -1,6 +1,8 @@
 using Microsoft.AspNetCore.Server.Kestrel.Core;
 using Svrnty.CQRS;
 using Svrnty.CQRS.Abstractions;
+using Svrnty.CQRS.Altcha;
+using Svrnty.CQRS.Altcha.Abstractions;
 using Svrnty.CQRS.DynamicQuery;
 using Svrnty.CQRS.FluentValidation;
 using Svrnty.CQRS.Grpc;
@@ -27,8 +29,14 @@ builder.Services.AddDynamicQueryWithProvider<User, UserQueryableProvider>();
 // Register commands and queries with validators
 builder.Services.AddCommand<AddUserCommand, int, AddUserCommandHandler, AddUserCommandValidator>();
 builder.Services.AddCommand<RemoveUserCommand, RemoveUserCommandHandler>();
+builder.Services.AddCommand<ProtectedActionCommand, string, ProtectedActionCommandHandler>();
 builder.Services.AddQuery<FetchUserQuery, User, FetchUserQueryHandler>();
 
+// Wire the Altcha check + a stub verifier so [Altcha] commands run
+// through the ICommandAuthorizationCheck pipeline.
+builder.Services.AddSvrntyAltcha();
+builder.Services.AddSingleton<IAltchaVerifier, StubAltchaVerifier>();
+
 // Configure CQRS with fluent API
 builder.Services.AddSvrntyCqrs(cqrs =>
 {
diff --git a/Svrnty.Sample/ProtectedActionCommand.cs b/Svrnty.Sample/ProtectedActionCommand.cs
new file mode 100644
index 0000000..a955b35
--- /dev/null
+++ b/Svrnty.Sample/ProtectedActionCommand.cs
@@ -0,0 +1,37 @@
+using Svrnty.CQRS.Abstractions;
+using Svrnty.CQRS.Altcha.Abstractions;
+
+namespace Svrnty.Sample;
+
+// Exercises the ICommandAuthorizationCheck seam at runtime.
+// The command is decorated with [Altcha] and carries the solution
+// through IHasAltchaSolution. With Svrnty.CQRS.Altcha + a registered
+// IAltchaVerifier, the framework's check pipeline reads the field,
+// calls the verifier, and short-circuits on failure.
+[Altcha]
+public sealed class ProtectedActionCommand : IHasAltchaSolution
+{
+    public string Action { get; set; } = string.Empty;
+    public string? AltchaSolution { get; set; }
+}
+
+public sealed class ProtectedActionCommandHandler : ICommandHandler<ProtectedActionCommand, string>
+{
+    public Task<string> HandleAsync(ProtectedActionCommand command, CancellationToken cancellationToken = default)
+    {
+        return Task.FromResult($"executed:{command.Action}");
+    }
+}
+
+// Stub verifier that doesn't talk to an external altcha service —
+// enough to exercise the check pipeline in isolation. Treats the
+// literal string "valid-solution" as a passing PoW solution.
+public sealed class StubAltchaVerifier : IAltchaVerifier
+{
+    public Task<AltchaVerifyResult> VerifyAsync(string payload, CancellationToken cancellationToken = default)
+    {
+        if (payload == "valid-solution")
+            return Task.FromResult(AltchaVerifyResult.Success);
+        return Task.FromResult(AltchaVerifyResult.Fail("stub-rejected"));
+    }
+}
diff --git a/Svrnty.Sample/Protos/cqrs_services.proto b/Svrnty.Sample/Protos/cqrs_services.proto
index 10bad1c..8f478ee 100644
--- a/Svrnty.Sample/Protos/cqrs_services.proto
+++ b/Svrnty.Sample/Protos/cqrs_services.proto
@@ -9,6 +9,9 @@ service CommandService {
   // AddUserCommand operation
   rpc AddUser (AddUserCommandRequest) returns (AddUserCommandResponse);
 
+  // ProtectedActionCommand operation
+  rpc ProtectedAction (ProtectedActionCommandRequest) returns (ProtectedActionCommandResponse);
+
   // RemoveUserCommand operation
   rpc RemoveUser (RemoveUserCommandRequest) returns (RemoveUserCommandResponse);
 
@@ -40,6 +43,17 @@ message AddUserCommandResponse {
   int32 result = 1;
 }
 
+// Request message for ProtectedActionCommand
+message ProtectedActionCommandRequest {
+  string action = 1;
+  string altcha_solution = 2;
+}
+
+// Response message for ProtectedActionCommand
+message ProtectedActionCommandResponse {
+  string result = 1;
+}
+
 // Request message for RemoveUserCommand
 message RemoveUserCommandRequest {
   int32 user_id = 1;
diff --git a/Svrnty.Sample/Svrnty.Sample.csproj b/Svrnty.Sample/Svrnty.Sample.csproj
index 2410a08..38231f7 100644
--- a/Svrnty.Sample/Svrnty.Sample.csproj
+++ b/Svrnty.Sample/Svrnty.Sample.csproj
@@ -33,6 +33,8 @@
     <ProjectReference Include="..\Svrnty.CQRS.DynamicQuery\Svrnty.CQRS.DynamicQuery.csproj" />
     <ProjectReference Include="..\Svrnty.CQRS.DynamicQuery.MinimalApi\Svrnty.CQRS.DynamicQuery.MinimalApi.csproj" />
     <ProjectReference Include="..\Svrnty.CQRS.Grpc.Abstractions\Svrnty.CQRS.Grpc.Abstractions.csproj" />
+    <ProjectReference Include="..\Svrnty.CQRS.Altcha.Abstractions\Svrnty.CQRS.Altcha.Abstractions.csproj" />
+    <ProjectReference Include="..\Svrnty.CQRS.Altcha\Svrnty.CQRS.Altcha.csproj" />
   </ItemGroup>
 
   <!-- Import the proto generation targets for testing (in production this would come from the NuGet package) -->