diff --git a/DigitalData.Core.DTO/BaseDto.cs b/DigitalData.Core.DTO/BaseDto.cs
new file mode 100644
index 0000000..747c521
--- /dev/null
+++ b/DigitalData.Core.DTO/BaseDto.cs
@@ -0,0 +1,17 @@
+namespace DigitalData.Core.DTO
+{
+	/// <summary>
+	/// Represents a base Data Transfer Object (DTO) with an identifier.
+	/// </summary>
+	/// <typeparam name="TId">The type of the identifier.</typeparam>
+	/// <param name="Id">The identifier of the DTO.</param>
+	public record BaseDto<TId>(TId Id) where TId : notnull
+	{
+		/// <summary>
+		/// Returns the hash code for this instance, based on the identifier.
+		/// This override ensures that the hash code is derived consistently from the identifier.
+		/// </summary>
+		/// <returns>A hash code for the current object, derived from the identifier.</returns>
+		public override int GetHashCode() => Id.GetHashCode();
+	}
+}
\ No newline at end of file
diff --git a/DigitalData.Core.Tests/ADServiceTests.cs b/DigitalData.Core.Tests/ADServiceTests.cs
deleted file mode 100644
index f7ec324..0000000
--- a/DigitalData.Core.Tests/ADServiceTests.cs
+++ /dev/null
@@ -1,18 +0,0 @@
-namespace DigitalData.Core.Tests
-{
-    [TestFixture]
-    public class ADServiceTests
-    {
-        [SetUp]
-        public void Setup()
-        {
-
-        }
-
-        [Test]
-        public void ValidateUser_CorrectCredentials_ReturnsTrue()
-        {
-
-        }
-    }
-}
diff --git a/DigitalData.Core.Tests/DTO/BaseDtoTest.cs b/DigitalData.Core.Tests/DTO/BaseDtoTest.cs
new file mode 100644
index 0000000..d9bda02
--- /dev/null
+++ b/DigitalData.Core.Tests/DTO/BaseDtoTest.cs
@@ -0,0 +1,79 @@
+using DigitalData.Core.DTO;
+
+namespace DigitalData.Core.Tests.DTO
+{
+	public class BaseDtoTest
+	{
+		public record SampleDto(int Id) : BaseDto<int>(Id);
+
+		[Test]
+		public void EntitiesWithSameIdShouldBeEqual()
+		{
+			var dto1 = new SampleDto(1);
+			var dto2 = new SampleDto(1);
+
+			Assert.That(dto2, Is.EqualTo(dto1));
+		}
+
+		[Test]
+		public void EntitiesWithDifferentIdsShouldNotBeEqual()
+		{
+			var dto1 = new SampleDto(1);
+			var dto2 = new SampleDto(2);
+
+			Assert.That(dto2, Is.Not.EqualTo(dto1));
+		}
+
+		[Test]
+		public void GetHashCodeShouldReturnSameValueForEntitiesWithSameId()
+		{
+			var dto1 = new SampleDto(1);
+			var dto2 = new SampleDto(1);
+
+			Assert.That(dto2.GetHashCode(), Is.EqualTo(dto1.GetHashCode()));
+		}
+
+		[Test]
+		public void EqualsShouldReturnFalseForNull()
+		{
+			var dto = new SampleDto(1);
+
+			Assert.IsFalse(dto.Equals(null));
+		}
+
+		[Test]
+		public void EqualityOperatorShouldReturnTrueForSameReference()
+		{
+			var dto = new SampleDto(1);
+
+			Assert.That(dto, Is.EqualTo(dto));
+		}
+
+		[Test]
+		public void EqualityOperatorShouldReturnFalseForDifferentEntitiesWithDifferentIds()
+		{
+			var dto1 = new SampleDto(1);
+			var dto2 = new SampleDto(2);
+
+			Assert.IsFalse(dto1 == dto2);
+		}
+
+		[Test]
+		public void InequalityOperatorShouldReturnTrueForDifferentEntitiesWithDifferentIds()
+		{
+			var dto1 = new SampleDto(1);
+			var dto2 = new SampleDto(2);
+
+			Assert.IsTrue(dto1 != dto2);
+		}
+
+		[Test]
+		public void InequalityOperatorShouldReturnFalseForEntitiesWithSameId()
+		{
+			var dto1 = new SampleDto(1);
+			var dto2 = new SampleDto(1);
+
+			Assert.IsFalse(dto1 != dto2);
+		}
+	}
+}
\ No newline at end of file
diff --git a/DigitalData.Core.Tests/DigitalData.Core.Tests.csproj b/DigitalData.Core.Tests/DigitalData.Core.Tests.csproj
index b284f28..a4fb147 100644
--- a/DigitalData.Core.Tests/DigitalData.Core.Tests.csproj
+++ b/DigitalData.Core.Tests/DigitalData.Core.Tests.csproj
@@ -18,4 +18,8 @@
     <PackageReference Include="coverlet.collector" Version="3.1.2" />
   </ItemGroup>
 
+  <ItemGroup>
+    <ProjectReference Include="..\DigitalData.Core.DTO\DigitalData.Core.DTO.csproj" />
+  </ItemGroup>
+
 </Project>
diff --git a/DigitalData.Core.sln b/DigitalData.Core.sln
index 8cd090c..7696df0 100644
--- a/DigitalData.Core.sln
+++ b/DigitalData.Core.sln
@@ -13,7 +13,7 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "DigitalData.Core.API", "Dig
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "DigitalData.Core.Tests", "DigitalData.Core.Tests\DigitalData.Core.Tests.csproj", "{B54DEF90-C30C-44EA-9875-76F1B330CBB7}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DigitalData.Core.DTO", "DigitalData.Core.DTO\DigitalData.Core.DTO.csproj", "{0B051A5F-BD38-47D1-BAFF-D44BA30D3FB7}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "DigitalData.Core.DTO", "DigitalData.Core.DTO\DigitalData.Core.DTO.csproj", "{0B051A5F-BD38-47D1-BAFF-D44BA30D3FB7}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution