diff --git a/packages/org.gamecult.eve.unity-scene/Runtime/CultMesh/EveUnityCultMeshLiveProviderTransport.cs b/packages/org.gamecult.eve.unity-scene/Runtime/CultMesh/EveUnityCultMeshLiveProviderTransport.cs
index 084accb..1c80bd6 100644
--- a/packages/org.gamecult.eve.unity-scene/Runtime/CultMesh/EveUnityCultMeshLiveProviderTransport.cs
+++ b/packages/org.gamecult.eve.unity-scene/Runtime/CultMesh/EveUnityCultMeshLiveProviderTransport.cs
@@ -55,7 +55,7 @@ namespace GameCult.Eve.UnityScene
         private CultNetDatabaseSubscriptionClient? _subscriptions;
         private EveProviderAdvertisementDocument? _advertisement;
         private EveAdvertisedSurface? _advertisedSurface;
-        private readonly CultMeshBodyPublicationResolver _bodyResolver;
+        private CultMeshBodyPublicationResolver? _bodyResolver;
 
         public EveUnityCultMeshLiveProviderTransport(
             string replicaPath,
@@ -286,6 +286,7 @@ namespace GameCult.Eve.UnityScene
 
         private CultMeshBodyPublicationResolver CreateBodyResolver()
         {
+            var producerId = RequireAdvertisedBodyProducerId(_advertisement);
             var mappedRoot = Path.GetDirectoryName(_replicaPath) ?? ".";
             return new CultMeshBodyPublicationResolver(new CultMeshBodyTransportService(
                 new ICultMeshBodyTransportAdapter[]
@@ -294,7 +295,20 @@ namespace GameCult.Eve.UnityScene
                     new CultMeshMappedBodyAdapter(mappedRoot),
                     new CultMeshNetworkBodyAdapter(ReadNetworkBody)
                 },
-                (producerId, _) => string.Equals(producerId, _providerId, StringComparison.Ordinal)));
+                (candidateProducerId, _) => IsAdvertisedBodyProducer(producerId, candidateProducerId)));
+        }
+
+        private static bool IsAdvertisedBodyProducer(string advertisedProducerId, string candidateProducerId) =>
+            string.Equals(candidateProducerId, advertisedProducerId, StringComparison.Ordinal);
+
+        private static string RequireAdvertisedBodyProducerId(EveProviderAdvertisementDocument? advertisement)
+        {
+            if (advertisement == null)
+                throw new InvalidOperationException("The Eve provider advertisement must be resolved before body transport authorization.");
+            if (string.IsNullOrWhiteSpace(advertisement.ServiceId))
+                throw new InvalidOperationException(
+                    $"Eve provider '{advertisement.ProviderId}' does not advertise a service identity for body production.");
+            return advertisement.ServiceId;
         }
 
         private byte[] ReadNetworkBody(CultMeshBodyDescriptor descriptor)
@@ -362,6 +376,7 @@ namespace GameCult.Eve.UnityScene
             var now = DateTimeOffset.UtcNow;
             if (!IsPublicationLive(publication, now))
                 return;
+            _bodyResolver ??= CreateBodyResolver();
             var lease = _bodyResolver.ResolveReadOnly(publication, new CultMeshBodyValidationRequest
             {
                 BodyId = handle.BodyId,
diff --git a/packages/org.gamecult.eve.unity-scene/Tests/Editor/EveUnitySceneSurfaceLowererTests.cs b/packages/org.gamecult.eve.unity-scene/Tests/Editor/EveUnitySceneSurfaceLowererTests.cs
index 025582d..4498bdf 100644
--- a/packages/org.gamecult.eve.unity-scene/Tests/Editor/EveUnitySceneSurfaceLowererTests.cs
+++ b/packages/org.gamecult.eve.unity-scene/Tests/Editor/EveUnitySceneSurfaceLowererTests.cs
@@ -89,6 +89,39 @@ namespace GameCult.Eve.UnityScene.Tests
             Assert.That(resolved, Is.EqualTo(bytes));
         }
 
+        [Test]
+        public void LiveTransportAuthorizesBodiesWithAdvertisedServiceIdentity()
+        {
+            var advertisement = ProviderAdvertisement("aetheria", "aetheria.daemon");
+            var method = typeof(EveUnityCultMeshLiveProviderTransport)
+                .GetMethod("RequireAdvertisedBodyProducerId", BindingFlags.NonPublic | BindingFlags.Static)!;
+
+            var producerId = (string)method.Invoke(null, new object?[] { advertisement })!;
+
+            Assert.That(producerId, Is.EqualTo("aetheria.daemon"));
+            Assert.That(producerId, Is.Not.EqualTo(advertisement.ProviderId));
+
+            var authorizes = typeof(EveUnityCultMeshLiveProviderTransport)
+                .GetMethod("IsAdvertisedBodyProducer", BindingFlags.NonPublic | BindingFlags.Static)!;
+            Assert.That(authorizes.Invoke(null, new object[] { producerId, "aetheria.daemon" }), Is.True);
+            Assert.That(authorizes.Invoke(null, new object[] { producerId, "aetheria" }), Is.False);
+            Assert.That(authorizes.Invoke(null, new object[] { producerId, "impostor" }), Is.False);
+        }
+
+        [Test]
+        public void LiveTransportRejectsAdvertisementWithoutBodyProducerIdentity()
+        {
+            var advertisement = ProviderAdvertisement("aetheria", "");
+            var method = typeof(EveUnityCultMeshLiveProviderTransport)
+                .GetMethod("RequireAdvertisedBodyProducerId", BindingFlags.NonPublic | BindingFlags.Static)!;
+
+            var error = Assert.Throws<TargetInvocationException>(() =>
+                method.Invoke(null, new object?[] { advertisement }));
+
+            Assert.That(error!.InnerException, Is.TypeOf<InvalidOperationException>());
+            StringAssert.Contains("does not advertise a service identity", error.InnerException!.Message);
+        }
+
         [Test]
         public void EntitySoaViewReadsGenericSemanticColumnsFromInjectedLease()
         {
@@ -2009,6 +2042,21 @@ namespace GameCult.Eve.UnityScene.Tests
             }
         };
 
+        private static EveProviderAdvertisementDocument ProviderAdvertisement(string providerId, string serviceId) =>
+            new EveProviderAdvertisementDocument(
+                providerId,
+                serviceId,
+                "test-verse",
+                "Test Provider",
+                "test",
+                "cultmesh://test/provider",
+                DateTimeOffset.UtcNow.ToString("O"),
+                new EveProviderFreshness("fresh", DateTimeOffset.UtcNow.ToString("O"), 5000),
+                Array.Empty<string>(),
+                Array.Empty<EveProviderWitness>(),
+                Array.Empty<EveAdvertisedSurface>(),
+                Array.Empty<EveAdvertisedCommand>());
+
         private static CultMeshBodyPublicationDocument BodyPublication(
             EveEntitySoaViewDocument view,
             long sequence)
diff --git a/packages/org.gamecult.eve.unity-scene/package.json b/packages/org.gamecult.eve.unity-scene/package.json
index 19375e6..064d093 100644
--- a/packages/org.gamecult.eve.unity-scene/package.json
+++ b/packages/org.gamecult.eve.unity-scene/package.json
@@ -1,7 +1,7 @@
 {
     "name": "org.gamecult.eve.unity-scene",
     "displayName": "Eve Unity Scene Lowering",
-    "version": "0.3.2",
+    "version": "0.3.3",
     "unity": "2021.3",
     "description": "Provider-agnostic Unity scene shell for gamecult.eve.surface.v1 interactive world surfaces.",
     "dependencies": {