diff --git a/DistTestCore/Codex/CodexContainerRecipe.cs b/DistTestCore/Codex/CodexContainerRecipe.cs
index b9ae94b..60f1c64 100644
--- a/DistTestCore/Codex/CodexContainerRecipe.cs
+++ b/DistTestCore/Codex/CodexContainerRecipe.cs
@@ -7,7 +7,6 @@ namespace DistTestCore.Codex
     public class CodexContainerRecipe : DefaultContainerRecipe
     {
         private const string DefaultDockerImage = "codexstorage/nim-codex:latest-dist-tests";
-
         public const string MetricsPortTag = "metrics_port";
         public const string DiscoveryPortTag = "discovery-port";
 
@@ -17,7 +16,7 @@ namespace DistTestCore.Codex
 
         public override string AppName => "codex";
         public override string Image { get; }
-        
+
         public CodexContainerRecipe()
         {
             Image = GetDockerImage();
@@ -38,7 +37,7 @@ namespace DistTestCore.Codex
             AddVolume($"codex/{dataDir}", GetVolumeCapacity(config));
 
             AddInternalPortAndVar("CODEX_DISC_PORT", DiscoveryPortTag);
-            AddEnvVar("CODEX_LOG_LEVEL", config.LogLevel.ToString()!.ToUpperInvariant());
+            AddEnvVar("CODEX_LOG_LEVEL", config.LogLevelWithTopics());
 
             // This makes the node announce itself to its local (pod) IP address.
             AddEnvVar("NAT_IP_AUTO", "true");
@@ -76,6 +75,11 @@ namespace DistTestCore.Codex
                 AddPodAnnotation("prometheus.io/port", metricsPort.Number.ToString());
             }
 
+            if (config.SimulateProofFailures != null)
+            {
+                AddEnvVar("CODEX_SIMULATE_PROOF_FAILURES", config.SimulateProofFailures.ToString()!);
+            }
+
             if (config.MarketplaceConfig != null)
             {
                 var gethConfig = startupConfig.Get<GethStartResult>();
@@ -93,9 +97,13 @@ namespace DistTestCore.Codex
 
                 if (config.MarketplaceConfig.IsValidator)
                 {
-                    AddEnvVar("CODEX_VALIDATOR", "true");
+                   AddEnvVar("CODEX_VALIDATOR", "true");
                 }
             }
+
+            if(!string.IsNullOrEmpty(config.NameOverride)) {
+                AddEnvVar("CODEX_NODENAME", config.NameOverride);
+            }
         }
 
         private ByteSize GetVolumeCapacity(CodexStartupConfig config)
diff --git a/DistTestCore/Codex/CodexStartupConfig.cs b/DistTestCore/Codex/CodexStartupConfig.cs
index 36e4757..0ca738d 100644
--- a/DistTestCore/Codex/CodexStartupConfig.cs
+++ b/DistTestCore/Codex/CodexStartupConfig.cs
@@ -12,14 +12,27 @@ namespace DistTestCore.Codex
             LogLevel = logLevel;
         }
 
+        public string LogLevelWithTopics()
+        {
+            var level = LogLevel.ToString()!.ToUpperInvariant();
+            if (LogTopics != null && LogTopics.Count() > 0)
+            {
+                level = $"INFO;{level}: {string.Join(",", LogTopics.Where(s => !string.IsNullOrEmpty(s)))}";
+            }
+            return level;
+        }
+
         public string? NameOverride { get; set; }
         public Location Location { get; set; }
-        public CodexLogLevel LogLevel { get; }
+        public CodexLogLevel LogLevel { get; set; }
+        public string[]? LogTopics { get; set; }
         public ByteSize? StorageQuota { get; set; }
         public MetricsMode MetricsMode { get; set; }
         public MarketplaceInitialConfig? MarketplaceConfig { get; set; }
         public string? BootstrapSpr { get; set; }
         public int? BlockTTL { get; set; }
+        public uint? SimulateProofFailures { get; set; }
+        public bool? EnableValidator { get; set; }
         public TimeSpan? BlockMaintenanceInterval { get; set; }
         public int? BlockMaintenanceNumber { get; set; }
     }
diff --git a/DistTestCore/CodexSetup.cs b/DistTestCore/CodexSetup.cs
index f2ec51e..e421aa9 100644
--- a/DistTestCore/CodexSetup.cs
+++ b/DistTestCore/CodexSetup.cs
@@ -9,6 +9,12 @@ namespace DistTestCore
     {
         ICodexSetup WithName(string name);
         ICodexSetup At(Location location);
+        ICodexSetup WithLogLevel(CodexLogLevel level);
+        /// <summary>
+        /// Sets the log level for codex. The default level is INFO and the
+        /// log level is applied only to the supplied topics.
+        /// </summary>
+        ICodexSetup WithLogLevel(CodexLogLevel level, params string[] topics);
         ICodexSetup WithBootstrapNode(IOnlineCodexNode node);
         ICodexSetup WithStorageQuota(ByteSize storageQuota);
         ICodexSetup WithBlockTTL(TimeSpan duration);
@@ -18,8 +24,12 @@ namespace DistTestCore
         ICodexSetup EnableMarketplace(TestToken initialBalance);
         ICodexSetup EnableMarketplace(TestToken initialBalance, Ether initialEther);
         ICodexSetup EnableMarketplace(TestToken initialBalance, Ether initialEther, bool isValidator);
+        /// <summary>
+        /// Provides an invalid proof every N proofs
+        /// </summary>
+        ICodexSetup WithSimulateProofFailures(uint failEveryNProofs);
     }
-    
+
     public class CodexSetup : CodexStartupConfig, ICodexSetup
     {
         public int NumberOfNodes { get; }
@@ -48,6 +58,19 @@ namespace DistTestCore
             return this;
         }
 
+        public ICodexSetup WithLogLevel(CodexLogLevel level)
+        {
+            LogLevel = level;
+            return this;
+        }
+
+        public ICodexSetup WithLogLevel(CodexLogLevel level, params string[] topics)
+        {
+            LogLevel = level;
+            LogTopics = topics;
+            return this;
+        }
+
         public ICodexSetup WithStorageQuota(ByteSize storageQuota)
         {
             StorageQuota = storageQuota;
@@ -94,6 +117,12 @@ namespace DistTestCore
             return this;
         }
 
+        public ICodexSetup WithSimulateProofFailures(uint failEveryNProofs)
+        {
+            SimulateProofFailures = failEveryNProofs;
+            return this;
+        }
+
         public string Describe()
         {
             var args = string.Join(',', DescribeArgs());
@@ -102,9 +131,11 @@ namespace DistTestCore
 
         private IEnumerable<string> DescribeArgs()
         {
-            yield return $"LogLevel={LogLevel}";
+            yield return $"LogLevel={LogLevelWithTopics()}";
             if (BootstrapSpr != null) yield return $"BootstrapNode={BootstrapSpr}";
-            if (StorageQuota != null) yield return $"StorageQuote={StorageQuota}";
+            if (StorageQuota != null) yield return $"StorageQuota={StorageQuota}";
+            if (SimulateProofFailures != null) yield return $"SimulateProofFailures={SimulateProofFailures}";
+            if (MarketplaceConfig != null) yield return $"IsValidator={MarketplaceConfig.IsValidator}";
         }
     }
 }
diff --git a/DistTestCore/CodexStarter.cs b/DistTestCore/CodexStarter.cs
index 86a839e..7a8947b 100644
--- a/DistTestCore/CodexStarter.cs
+++ b/DistTestCore/CodexStarter.cs
@@ -20,6 +20,7 @@ namespace DistTestCore
             LogSeparator();
             LogStart($"Starting {codexSetup.Describe()}...");
             var gethStartResult = lifecycle.GethStarter.BringOnlineMarketplaceFor(codexSetup);
+            gethStartResult = lifecycle.GethStarter.BringOnlineValidatorFor(codexSetup, gethStartResult);
 
             var startupConfig = CreateStartupConfig(gethStartResult, codexSetup);
 
diff --git a/DistTestCore/DistTestCore.csproj b/DistTestCore/DistTestCore.csproj
index 94a2271..89d4b1f 100644
--- a/DistTestCore/DistTestCore.csproj
+++ b/DistTestCore/DistTestCore.csproj
@@ -5,10 +5,6 @@
 	  <RootNamespace>DistTestCore</RootNamespace>
 	  <ImplicitUsings>enable</ImplicitUsings>
 	  <Nullable>enable</Nullable>
-    <IsArm64 Condition="'$([System.Runtime.InteropServices.RuntimeInformation]::OSArchitecture)' == 'Arm64'">true</IsArm64>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(IsArm64)'=='true'">
-    <DefineConstants>Arm64</DefineConstants>
   </PropertyGroup>
   <ItemGroup>
     <None Remove="Metrics\dashboard.json" />
diff --git a/DistTestCore/GethStarter.cs b/DistTestCore/GethStarter.cs
index 578cc30..7df4ba4 100644
--- a/DistTestCore/GethStarter.cs
+++ b/DistTestCore/GethStarter.cs
@@ -30,6 +30,17 @@ namespace DistTestCore
             return CreateGethStartResult(marketplaceNetwork, companionNode);
         }
 
+        public GethStartResult BringOnlineValidatorFor(CodexSetup codexSetup, GethStartResult previousResult)
+        {
+            // allow marketplace and validator to be enabled on the same Codex node
+            if (previousResult.CompanionNode != null || (codexSetup.EnableValidator ?? false) == false) return previousResult;
+
+            var marketplaceNetwork = marketplaceNetworkCache.Get();
+            var companionNode = StartCompanionNode(codexSetup, marketplaceNetwork);
+
+            return CreateGethStartResult(marketplaceNetwork, companionNode);
+        }
+
         private void TransferInitialBalance(MarketplaceNetwork marketplaceNetwork, MarketplaceInitialConfig marketplaceConfig, GethCompanionNodeInfo companionNode)
         {
             if (marketplaceConfig.InitialTestTokens.Amount == 0) return;