diff --git a/src/PlateauResoniteLink/Application/Importing/CityGmlAppearanceStore.cs b/src/PlateauResoniteLink/Application/Importing/CityGmlAppearanceStore.cs
index 01c1e6c5..6d84d860 100644
--- a/src/PlateauResoniteLink/Application/Importing/CityGmlAppearanceStore.cs
+++ b/src/PlateauResoniteLink/Application/Importing/CityGmlAppearanceStore.cs
@@ -191,13 +191,11 @@ private void ApplyGeoreferencedTexture(XElement textureElement)
             texturePayload = new EncodedImageTexturePayload(
                 null,
                 null,
-                "sRGB",
                 TextureImportSourceFactory.CreateDatasetEncodedImage(
                     datasetSource,
                     resolvedTexturePath,
                     "sRGB",
-                    $"dataset:{resolvedTexturePath}"),
-                $"dataset:{resolvedTexturePath}");
+                    $"dataset:{resolvedTexturePath}"));
             texturePayloadsByResolvedPath[resolvedTexturePath] = texturePayload;
         }
 
diff --git a/src/PlateauResoniteLink/Application/Importing/MaterialGroupingPolicy.cs b/src/PlateauResoniteLink/Application/Importing/MaterialGroupingPolicy.cs
index 1f189310..c50e54b2 100644
--- a/src/PlateauResoniteLink/Application/Importing/MaterialGroupingPolicy.cs
+++ b/src/PlateauResoniteLink/Application/Importing/MaterialGroupingPolicy.cs
@@ -33,7 +33,7 @@ internal static MaterialGroupingKey CreateKey(
 
         return new MaterialGroupingKey(
             material.MaterialType,
-            material.TexturePayload?.Identity,
+            material.TexturePayload?.Source.Identity,
             material.TextureSourceKind,
             material.Projection,
             depthOffset,
diff --git a/src/PlateauResoniteLink/Application/Importing/SceneImportContractTypes.cs b/src/PlateauResoniteLink/Application/Importing/SceneImportContractTypes.cs
index fbf46231..3f3fc31b 100644
--- a/src/PlateauResoniteLink/Application/Importing/SceneImportContractTypes.cs
+++ b/src/PlateauResoniteLink/Application/Importing/SceneImportContractTypes.cs
@@ -98,24 +98,13 @@ public sealed record MeshSubmesh(
 
 public abstract record TexturePayload
 {
-    private protected TexturePayload(
-        string? colorProfile,
-        string identity,
-        ITextureImportSource source)
+    private protected TexturePayload(ITextureImportSource source)
     {
-        if (string.IsNullOrWhiteSpace(identity))
-        {
-            throw new ArgumentException("Texture payload identity must be provided.", nameof(identity));
-        }
-
-        ColorProfile = colorProfile;
-        Identity = identity;
-        Source = source ?? throw new ArgumentNullException(nameof(source));
-    }
-
-    public string? ColorProfile { get; }
+        ArgumentNullException.ThrowIfNull(source);
+        ArgumentException.ThrowIfNullOrWhiteSpace(source.Identity);
 
-    public string Identity { get; }
+        Source = source;
+    }
 
     public ITextureImportSource Source { get; }
 }
@@ -142,8 +131,8 @@ private RawRgba32TexturePayload(
         int height,
         string? colorProfile,
         byte[] binaryPayload,
-        (string Identity, ITextureImportSource Source) source)
-        : base(colorProfile, source.Identity, source.Source)
+        ITextureImportSource source)
+        : base(source)
     {
         ArgumentNullException.ThrowIfNull(binaryPayload);
         Width = width;
@@ -157,7 +146,7 @@ private RawRgba32TexturePayload(
 
     public ImmutableArray<byte> BinaryPayload { get; }
 
-    private static (string Identity, ITextureImportSource Source) CreateSource(
+    private static ITextureImportSource CreateSource(
         int width,
         int height,
         string? colorProfile,
@@ -166,14 +155,12 @@ private static (string Identity, ITextureImportSource Source) CreateSource(
     {
         ArgumentNullException.ThrowIfNull(binaryPayload);
         string effectiveIdentity = identity ?? Guid.NewGuid().ToString("N");
-        return (
-            effectiveIdentity,
-            TextureImportSourceFactory.CreateInMemoryRaw(
-                width,
-                height,
-                colorProfile,
-                binaryPayload,
-                effectiveIdentity));
+        return TextureImportSourceFactory.CreateInMemoryRaw(
+            width,
+            height,
+            colorProfile,
+            binaryPayload,
+            effectiveIdentity);
     }
 }
 
@@ -182,19 +169,8 @@ public sealed record EncodedImageTexturePayload : TexturePayload
     public EncodedImageTexturePayload(
         int? width,
         int? height,
-        string? colorProfile,
-        ITextureImportSource source,
-        string? identity = null)
-        : this(width, height, colorProfile, CreateSource(source, identity))
-    {
-    }
-
-    private EncodedImageTexturePayload(
-        int? width,
-        int? height,
-        string? colorProfile,
-        (string Identity, ITextureImportSource Source) source)
-        : base(colorProfile, source.Identity, source.Source)
+        ITextureImportSource source)
+        : base(source)
     {
         Width = width;
         Height = height;
@@ -203,14 +179,6 @@ private EncodedImageTexturePayload(
     public int? Width { get; }
 
     public int? Height { get; }
-
-    private static (string Identity, ITextureImportSource Source) CreateSource(
-        ITextureImportSource source,
-        string? identity)
-    {
-        ArgumentNullException.ThrowIfNull(source);
-        return (identity ?? source.Identity, source);
-    }
 }
 
 public enum TextureSourceKind
diff --git a/src/PlateauResoniteLink/Targets/Resonite/ResoniteTexturePayload.cs b/src/PlateauResoniteLink/Targets/Resonite/ResoniteTexturePayload.cs
index b322e354..0acf67fe 100644
--- a/src/PlateauResoniteLink/Targets/Resonite/ResoniteTexturePayload.cs
+++ b/src/PlateauResoniteLink/Targets/Resonite/ResoniteTexturePayload.cs
@@ -7,25 +7,15 @@ namespace PlateauResoniteLink.Targets.Resonite;
 
 public abstract class ResoniteTexturePayload
 {
-    private protected ResoniteTexturePayload(
-        string? colorProfile,
-        string identity,
-        ITextureImportSource source)
+    private protected ResoniteTexturePayload(ITextureImportSource source)
     {
-        if (string.IsNullOrWhiteSpace(identity))
+        Source = source ?? throw new ArgumentNullException(nameof(source));
+        if (string.IsNullOrWhiteSpace(Source.Identity))
         {
-            throw new ArgumentException("Resonite texture payload identity must be provided.", nameof(identity));
+            throw new ArgumentException("Texture source identity must be non-empty.", nameof(source));
         }
-
-        ColorProfile = colorProfile;
-        Identity = identity;
-        Source = source ?? throw new ArgumentNullException(nameof(source));
     }
 
-    public string? ColorProfile { get; }
-
-    public string Identity { get; }
-
     public ITextureImportSource Source { get; }
 }
 
@@ -51,8 +41,8 @@ private RawRgba32ResoniteTexturePayload(
         int height,
         string? colorProfile,
         byte[] binaryPayload,
-        (string Identity, ITextureImportSource Source) source)
-        : base(colorProfile, source.Identity, source.Source)
+        ITextureImportSource source)
+        : base(source)
     {
         ArgumentNullException.ThrowIfNull(binaryPayload);
         Width = width;
@@ -66,7 +56,7 @@ private RawRgba32ResoniteTexturePayload(
 
     public ImmutableArray<byte> BinaryPayload { get; }
 
-    private static (string Identity, ITextureImportSource Source) CreateSource(
+    private static ITextureImportSource CreateSource(
         int width,
         int height,
         string? colorProfile,
@@ -75,14 +65,12 @@ private static (string Identity, ITextureImportSource Source) CreateSource(
     {
         ArgumentNullException.ThrowIfNull(binaryPayload);
         string effectiveIdentity = identity ?? Guid.NewGuid().ToString("N");
-        return (
-            effectiveIdentity,
-            TextureImportSourceFactory.CreateInMemoryRaw(
-                width,
-                height,
-                colorProfile,
-                binaryPayload,
-                effectiveIdentity));
+        return TextureImportSourceFactory.CreateInMemoryRaw(
+            width,
+            height,
+            colorProfile,
+            binaryPayload,
+            effectiveIdentity);
     }
 }
 
@@ -91,19 +79,8 @@ public sealed class EncodedImageResoniteTexturePayload : ResoniteTexturePayload
     public EncodedImageResoniteTexturePayload(
         int? width,
         int? height,
-        string? colorProfile,
-        ITextureImportSource source,
-        string? identity = null)
-        : this(width, height, colorProfile, CreateSource(source, identity))
-    {
-    }
-
-    private EncodedImageResoniteTexturePayload(
-        int? width,
-        int? height,
-        string? colorProfile,
-        (string Identity, ITextureImportSource Source) source)
-        : base(colorProfile, source.Identity, source.Source)
+        ITextureImportSource source)
+        : base(source)
     {
         Width = width;
         Height = height;
@@ -112,12 +89,4 @@ private EncodedImageResoniteTexturePayload(
     public int? Width { get; }
 
     public int? Height { get; }
-
-    private static (string Identity, ITextureImportSource Source) CreateSource(
-        ITextureImportSource source,
-        string? identity)
-    {
-        ArgumentNullException.ThrowIfNull(source);
-        return (identity ?? source.Identity, source);
-    }
 }
diff --git a/src/PlateauResoniteLink/Targets/Resonite/SceneImportContractMapper.cs b/src/PlateauResoniteLink/Targets/Resonite/SceneImportContractMapper.cs
index b2fd47b2..b6552450 100644
--- a/src/PlateauResoniteLink/Targets/Resonite/SceneImportContractMapper.cs
+++ b/src/PlateauResoniteLink/Targets/Resonite/SceneImportContractMapper.cs
@@ -138,15 +138,13 @@ private static ResoniteTexturePayload ToInternal(TexturePayload payload)
             RawRgba32TexturePayload raw => new RawRgba32ResoniteTexturePayload(
                 raw.Width,
                 raw.Height,
-                raw.ColorProfile,
+                raw.Source.ColorProfile,
                 raw.BinaryPayload.AsSpan().ToArray(),
-                raw.Identity),
+                raw.Source.Identity),
             EncodedImageTexturePayload encoded => new EncodedImageResoniteTexturePayload(
                 encoded.Width,
                 encoded.Height,
-                encoded.ColorProfile,
-                encoded.Source,
-                encoded.Identity),
+                encoded.Source),
             _ => throw new ArgumentOutOfRangeException(nameof(payload), payload.GetType(), "Unsupported texture payload type."),
         };
     }
diff --git a/tests/PlateauResoniteLink.Tests/Application/TexturePayloadTests.cs b/tests/PlateauResoniteLink.Tests/Application/TexturePayloadTests.cs
index 0fb7fe65..79d7d4ce 100644
--- a/tests/PlateauResoniteLink.Tests/Application/TexturePayloadTests.cs
+++ b/tests/PlateauResoniteLink.Tests/Application/TexturePayloadTests.cs
@@ -1,3 +1,5 @@
+using System;
+
 using PlateauResoniteLink.Application.Importing;
 
 namespace PlateauResoniteLink.Tests.Application;
@@ -14,4 +16,31 @@ public void ConstructorCopiesBinaryPayloadBytes()
 
         Assert.Equal<byte>([1, 2, 3, 4], payload.BinaryPayload);
     }
+
+    [Fact]
+    public void ConstructorCarriesIdentityAndColorProfileOnSourceOnly()
+    {
+        RawRgba32TexturePayload payload = new(1, 1, "sRGB", [1, 2, 3, 4], "dataset:texture");
+
+        Assert.Equal("dataset:texture", payload.Source.Identity);
+        Assert.Equal("sRGB", payload.Source.ColorProfile);
+    }
+
+    [Fact]
+    public void ConstructorRejectsTextureSourceWithoutIdentity()
+    {
+        Assert.Throws<ArgumentException>(
+            () => new EncodedImageTexturePayload(null, null, new BlankIdentityTextureImportSource()));
+    }
+
+    private sealed class BlankIdentityTextureImportSource : ITextureImportSource
+    {
+        public string Identity => " ";
+
+        public string Description => "blank";
+
+        public string? ColorProfile => null;
+
+        public long? EstimatedByteLength => null;
+    }
 }
diff --git a/tests/PlateauResoniteLink.Tests/Profiles/LocalCityGmlObjectProjectionTests.cs b/tests/PlateauResoniteLink.Tests/Profiles/LocalCityGmlObjectProjectionTests.cs
index 47095100..490c7f66 100644
--- a/tests/PlateauResoniteLink.Tests/Profiles/LocalCityGmlObjectProjectionTests.cs
+++ b/tests/PlateauResoniteLink.Tests/Profiles/LocalCityGmlObjectProjectionTests.cs
@@ -2073,10 +2073,10 @@ public void ProjectCityObjectCullsBottomBandBuildingSurfacesBySemanticOrDownward
             materialResolver: new DefaultMaterialResolver(CommonMaterialCatalog.Create()));
 
         Assert.Equal(3, projected.Materials.Count);
-        Assert.DoesNotContain(projected.Materials, static material => material.TexturePayload?.Identity == "ground");
-        Assert.DoesNotContain(projected.Materials, static material => material.TexturePayload?.Identity == "ground-reversed");
-        Assert.DoesNotContain(projected.Materials, static material => material.TexturePayload?.Identity == "outer-floor");
-        Assert.Contains(projected.Materials, static material => material.TexturePayload?.Identity == "high-outer-floor");
+        Assert.DoesNotContain(projected.Materials, static material => material.TexturePayload?.Source.Identity == "ground");
+        Assert.DoesNotContain(projected.Materials, static material => material.TexturePayload?.Source.Identity == "ground-reversed");
+        Assert.DoesNotContain(projected.Materials, static material => material.TexturePayload?.Source.Identity == "outer-floor");
+        Assert.Contains(projected.Materials, static material => material.TexturePayload?.Source.Identity == "high-outer-floor");
     }
 
     [Fact]
@@ -2113,7 +2113,7 @@ public void ProjectCityObjectKeepsNonBuildingDownwardHorizontalGroundSurface()
             materialResolver: new DefaultMaterialResolver(CommonMaterialCatalog.Create()));
 
         Assert.Single(projected.Materials);
-        Assert.Equal("tran-ground", projected.Materials[0].TexturePayload?.Identity);
+        Assert.Equal("tran-ground", projected.Materials[0].TexturePayload?.Source.Identity);
         Assert.NotEmpty(projected.Mesh.Vertices);
     }
 
@@ -2171,10 +2171,10 @@ public void ProjectCityObjectCullsBuildingLod1UnknownBottomBandSurfaces()
             materialResolver: new DefaultMaterialResolver(CommonMaterialCatalog.Create()));
 
         Assert.Equal(2, projected.Materials.Count);
-        Assert.DoesNotContain(projected.Materials, static material => material.TexturePayload?.Identity == "lod1-bottom");
-        Assert.DoesNotContain(projected.Materials, static material => material.TexturePayload?.Identity == "lod1-bottom-reversed");
-        Assert.Contains(projected.Materials, static material => material.TexturePayload?.Identity == "lod1-roof");
-        Assert.Contains(projected.Materials, static material => material.TexturePayload?.Identity == "lod1-wall");
+        Assert.DoesNotContain(projected.Materials, static material => material.TexturePayload?.Source.Identity == "lod1-bottom");
+        Assert.DoesNotContain(projected.Materials, static material => material.TexturePayload?.Source.Identity == "lod1-bottom-reversed");
+        Assert.Contains(projected.Materials, static material => material.TexturePayload?.Source.Identity == "lod1-roof");
+        Assert.Contains(projected.Materials, static material => material.TexturePayload?.Source.Identity == "lod1-wall");
     }
 
     [Fact]
@@ -2246,7 +2246,7 @@ public void ProjectCityObjectKeepsSingleDownwardHorizontalBuildingSurfaceWhenNoH
             materialResolver: new DefaultMaterialResolver(CommonMaterialCatalog.Create()));
 
         Assert.Single(projected.Materials);
-        Assert.Contains(projected.Materials, static material => material.TexturePayload?.Identity == "only-surface");
+        Assert.Contains(projected.Materials, static material => material.TexturePayload?.Source.Identity == "only-surface");
     }
 
     [Fact]
@@ -2378,7 +2378,7 @@ await service.ExecuteAsync(
         Assert.NotNull(explicitMaterial.TexturePayload);
         Assert.Contains(
             "udx/dem/53394525/appearance/mixed_surface.png",
-            explicitMaterial.TexturePayload!.Identity,
+            explicitMaterial.TexturePayload!.Source.Identity,
             StringComparison.Ordinal);
     }
 
diff --git a/tests/PlateauResoniteLink.Tests/Targets/NonDemCityObjectBakerTests.cs b/tests/PlateauResoniteLink.Tests/Targets/NonDemCityObjectBakerTests.cs
index dc8ebe9b..b4d72ec7 100644
--- a/tests/PlateauResoniteLink.Tests/Targets/NonDemCityObjectBakerTests.cs
+++ b/tests/PlateauResoniteLink.Tests/Targets/NonDemCityObjectBakerTests.cs
@@ -118,7 +118,7 @@ await AssertBufferedAsync(
         ResoniteConstructionCityObject cityObject = Assert.Single(await baker.FlushAllAsync());
 
         string?[] identities = cityObject.Materials
-            .Select(static material => material.TexturePayload?.Identity)
+            .Select(static material => material.TexturePayload?.Source.Identity)
             .ToArray();
         Assert.Collection(
             identities,
@@ -147,7 +147,7 @@ await AssertBufferedAsync(
         Assert.Equal(CommonMaterialCatalog.Create().Generic.Uv, material.CommonMaterial);
         Assert.NotSame(payload, material.TexturePayload);
         Assert.NotNull(material.TexturePayload);
-        Assert.Contains("atlastex-", material.TexturePayload.Identity, StringComparison.Ordinal);
+        Assert.Contains("atlastex-", material.TexturePayload.Source.Identity, StringComparison.Ordinal);
         Assert.IsType<RawRgba32ResoniteTexturePayload>(material.TexturePayload);
         Assert.Null(material.TextureScale);
         Assert.Null(material.TextureOffset);
@@ -189,7 +189,7 @@ await AssertBufferedAsync(
             double averageX = submesh.TriangleVertexIndices
                 .Select(index => cityObject.Mesh.Vertices[index].Position.X)
                 .Average();
-            averageXByPayloadIdentity.Add(material.TexturePayload?.Identity ?? string.Empty, averageX);
+            averageXByPayloadIdentity.Add(material.TexturePayload?.Source.Identity ?? string.Empty, averageX);
         }
 
         Assert.True(averageXByPayloadIdentity["textures/left.png"] < averageXByPayloadIdentity["textures/right.png"]);
@@ -585,7 +585,7 @@ public async Task FlushAllAsyncFallsBackToOriginalCityObjectWhenSingleCandidateC
         Assert.Equal(oversizedCandidate.DisplayName, cityObject.DisplayName);
         Assert.Equal(oversizedCandidate.Materials.Count, cityObject.Materials.Count);
         Assert.All(cityObject.Materials, static material => Assert.NotNull(material.TexturePayload));
-        Assert.DoesNotContain(cityObject.Materials, static material => material.TexturePayload?.Identity?.Contains("generated/lod2-atlas/", StringComparison.Ordinal) == true);
+        Assert.DoesNotContain(cityObject.Materials, static material => material.TexturePayload?.Source.Identity?.Contains("generated/lod2-atlas/", StringComparison.Ordinal) == true);
     }
 
     [Fact]
@@ -610,7 +610,7 @@ public async Task FlushAllAsyncFallsBackToNormalizedCityObjectWhenSingleCandidat
         Assert.Equal(new ResoniteFloat2(0.25, 0.75), cityObject.Mesh.Vertices[0].UV0);
         Assert.Equal(new ResoniteFloat2(2.25, 0.75), cityObject.Mesh.Vertices[1].UV0);
         Assert.Equal(new ResoniteFloat2(0.25, 1.25), cityObject.Mesh.Vertices[2].UV0);
-        Assert.DoesNotContain(cityObject.Materials, static candidate => candidate.TexturePayload?.Identity?.Contains("generated/lod2-atlas/", StringComparison.Ordinal) == true);
+        Assert.DoesNotContain(cityObject.Materials, static candidate => candidate.TexturePayload?.Source.Identity?.Contains("generated/lod2-atlas/", StringComparison.Ordinal) == true);
     }
 
     [Fact]
@@ -786,7 +786,7 @@ public async Task FlushAllAsyncFallsBackWhenSingleCandidateNeedsNonPowerOfTwoEdg
 
         ResoniteConstructionCityObject cityObject = Assert.Single(await baker.FlushAllAsync());
         Assert.Equal(oversizedCandidate.SlotKey, cityObject.SlotKey);
-        Assert.DoesNotContain(cityObject.Materials, static material => material.TexturePayload?.Identity?.Contains("generated/lod2-atlas/", StringComparison.Ordinal) == true);
+        Assert.DoesNotContain(cityObject.Materials, static material => material.TexturePayload?.Source.Identity?.Contains("generated/lod2-atlas/", StringComparison.Ordinal) == true);
     }
 
     [Fact]
@@ -1050,7 +1050,7 @@ await AssertBufferedAsync(
         Assert.Equal("atlasbake-unit-a-bldg-lod2-3", cityObject.SlotKey);
         Assert.Equal(
             "atlastex-unit-a.gml-3",
-            Assert.IsType<RawRgba32ResoniteTexturePayload>(Assert.Single(cityObject.Materials).TexturePayload).Identity);
+            Assert.IsType<RawRgba32ResoniteTexturePayload>(Assert.Single(cityObject.Materials).TexturePayload).Source.Identity);
     }
 
     private static NonDemCityObjectBaker CreateBaker(
diff --git a/tests/PlateauResoniteLink.Tests/Targets/ResoniteLiveSceneImportTargetTestSupport.cs b/tests/PlateauResoniteLink.Tests/Targets/ResoniteLiveSceneImportTargetTestSupport.cs
index bd23d64d..86e1dc8b 100644
--- a/tests/PlateauResoniteLink.Tests/Targets/ResoniteLiveSceneImportTargetTestSupport.cs
+++ b/tests/PlateauResoniteLink.Tests/Targets/ResoniteLiveSceneImportTargetTestSupport.cs
@@ -546,15 +546,13 @@ private static TexturePayload ToContractTexturePayload(ResoniteTexturePayload pa
             RawRgba32ResoniteTexturePayload raw => new RawRgba32TexturePayload(
                 raw.Width,
                 raw.Height,
-                raw.ColorProfile,
+                raw.Source.ColorProfile,
                 raw.BinaryPayload.AsSpan().ToArray(),
-                raw.Identity),
+                raw.Source.Identity),
             EncodedImageResoniteTexturePayload encoded => new EncodedImageTexturePayload(
                 encoded.Width,
                 encoded.Height,
-                encoded.ColorProfile,
-                encoded.Source,
-                encoded.Identity),
+                encoded.Source),
             _ => throw new ArgumentOutOfRangeException(nameof(payload), payload.GetType(), "Unsupported texture payload type."),
         };
 
diff --git a/tests/PlateauResoniteLink.Tests/Targets/ResoniteTexturePayloadTests.cs b/tests/PlateauResoniteLink.Tests/Targets/ResoniteTexturePayloadTests.cs
index 86b8aac0..2f520535 100644
--- a/tests/PlateauResoniteLink.Tests/Targets/ResoniteTexturePayloadTests.cs
+++ b/tests/PlateauResoniteLink.Tests/Targets/ResoniteTexturePayloadTests.cs
@@ -1,3 +1,6 @@
+using System;
+
+using PlateauResoniteLink.Application.Importing;
 using PlateauResoniteLink.Targets.Resonite;
 
 namespace PlateauResoniteLink.Tests.Targets;
@@ -14,4 +17,31 @@ public void ConstructorCopiesBinaryPayloadBytes()
 
         Assert.Equal<byte>([4, 3, 2, 1], payload.BinaryPayload);
     }
+
+    [Fact]
+    public void ConstructorCarriesIdentityAndColorProfileOnSourceOnly()
+    {
+        RawRgba32ResoniteTexturePayload payload = new(1, 1, "sRGB", [4, 3, 2, 1], "dataset:texture");
+
+        Assert.Equal("dataset:texture", payload.Source.Identity);
+        Assert.Equal("sRGB", payload.Source.ColorProfile);
+    }
+
+    [Fact]
+    public void ConstructorRejectsTextureSourceWithoutIdentity()
+    {
+        Assert.Throws<ArgumentException>(
+            () => new EncodedImageResoniteTexturePayload(null, null, new BlankIdentityTextureImportSource()));
+    }
+
+    private sealed class BlankIdentityTextureImportSource : ITextureImportSource
+    {
+        public string Identity => " ";
+
+        public string Description => "blank";
+
+        public string? ColorProfile => null;
+
+        public long? EstimatedByteLength => null;
+    }
 }
diff --git a/tests/PlateauResoniteLink.Tests/Targets/SceneImportContractMapperTests.cs b/tests/PlateauResoniteLink.Tests/Targets/SceneImportContractMapperTests.cs
index b79d6ac2..4dbe41a0 100644
--- a/tests/PlateauResoniteLink.Tests/Targets/SceneImportContractMapperTests.cs
+++ b/tests/PlateauResoniteLink.Tests/Targets/SceneImportContractMapperTests.cs
@@ -33,7 +33,7 @@ public void ToInternalMaterialBindingsPreservesNeutralContractFields()
         Assert.Equal(0.1, mapped.BaseColor.R, 9);
         Assert.Equal(0.2, mapped.BaseColor.G, 9);
         EncodedImageResoniteTexturePayload encodedPayload = Assert.IsType<EncodedImageResoniteTexturePayload>(mapped.TexturePayload);
-        Assert.Equal("dataset:texture", encodedPayload.Identity);
+        Assert.Equal("dataset:texture", encodedPayload.Source.Identity);
         Assert.Equal(-1.5, mapped.DepthOffset!.Factor, 9);
         Assert.Equal(2.5, mapped.DepthOffset.Units, 9);
         Assert.Equal(0.25, mapped.TextureScale!.X, 9);
@@ -67,7 +67,7 @@ public void ToInternalMaterialBindingsMapsRawTextureDimensionsWithoutNullableGua
         RawRgba32ResoniteTexturePayload rawPayload = Assert.IsType<RawRgba32ResoniteTexturePayload>(mapped.TexturePayload);
         Assert.Equal(2, rawPayload.Width);
         Assert.Equal(1, rawPayload.Height);
-        Assert.Equal("raw:texture", rawPayload.Identity);
+        Assert.Equal("raw:texture", rawPayload.Source.Identity);
         Assert.Equal<byte>([1, 2, 3, 4, 5, 6, 7, 8], rawPayload.BinaryPayload);
     }
 
@@ -174,7 +174,6 @@ private static TexturePayload CreateEncodedTexturePayload()
         return new EncodedImageTexturePayload(
             width: 2,
             height: 2,
-            colorProfile: "sRGB",
             source: TextureImportSourceFactory.CreateInMemoryEncodedImage(
                 colorProfile: "sRGB",
                 bytes: [1, 2, 3, 4],