diff --git a/Iceshrimp.Backend/Core/Configuration/Constants.cs b/Iceshrimp.Backend/Core/Configuration/Constants.cs
index 78d8e80e..7383b272 100644
--- a/Iceshrimp.Backend/Core/Configuration/Constants.cs
+++ b/Iceshrimp.Backend/Core/Configuration/Constants.cs
@@ -2,6 +2,7 @@ namespace Iceshrimp.Backend.Core.Configuration;
 
 public static class Constants {
 	public const           string   ActivityStreamsNs = "https://www.w3.org/ns/activitystreams";
+	public const           string   W3IdSecurityNs    = "https://w3id.org/security";
 	public static readonly string[] SystemUsers       = ["instance.actor", "relay.actor"];
 
 	public static readonly string[] BrowserSafeMimeTypes = [
diff --git a/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASActivity.cs b/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASActivity.cs
index f2eedf18..6ecc705a 100644
--- a/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASActivity.cs
+++ b/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASActivity.cs
@@ -5,11 +5,11 @@ using JC = Newtonsoft.Json.JsonConverterAttribute;
 namespace Iceshrimp.Backend.Core.Federation.ActivityStreams.Types;
 
 public class ASActivity : ASObject {
-	[J("https://www.w3.org/ns/activitystreams#actor")]
+	[J($"{Constants.ActivityStreamsNs}#actor")]
 	[JC(typeof(ASActorConverter))]
 	public ASActor? Actor { get; set; }
 
-	[J("https://www.w3.org/ns/activitystreams#object")]
+	[J($"{Constants.ActivityStreamsNs}#object")]
 	[JC(typeof(ASObjectConverter))]
 	public ASObject? Object { get; set; }
 
diff --git a/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASActor.cs b/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASActor.cs
index d4cec8ff..1fb01134 100644
--- a/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASActor.cs
+++ b/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASActor.cs
@@ -20,15 +20,15 @@ public class ASActor : ASObject {
 	[JC(typeof(VC))]
 	public string? MkSummary { get; set; }
 
-	[J("https://www.w3.org/ns/activitystreams#summary")]
+	[J($"{Constants.ActivityStreamsNs}#summary")]
 	[JC(typeof(VC))]
 	public string? Summary { get; set; }
 
-	[J("https://www.w3.org/ns/activitystreams#name")]
+	[J($"{Constants.ActivityStreamsNs}#name")]
 	[JC(typeof(VC))]
 	public string? DisplayName { get; set; }
 
-	[J("https://www.w3.org/ns/activitystreams#preferredUsername")]
+	[J($"{Constants.ActivityStreamsNs}#preferredUsername")]
 	[JC(typeof(VC))]
 	public string? Username { get; set; }
 
@@ -44,7 +44,7 @@ public class ASActor : ASObject {
 	[JC(typeof(VC))]
 	public bool? IsMemorial { get; set; }
 
-	[J("https://www.w3.org/ns/activitystreams#manuallyApprovesFollowers")]
+	[J($"{Constants.ActivityStreamsNs}#manuallyApprovesFollowers")]
 	[JC(typeof(VC))]
 	public bool? IsLocked { get; set; }
 
@@ -60,11 +60,11 @@ public class ASActor : ASObject {
 	[JC(typeof(VC))]
 	public string? Birthday { get; set; }
 
-	[J("https://www.w3.org/ns/activitystreams#endpoints")]
+	[J($"{Constants.ActivityStreamsNs}#endpoints")]
 	[JC(typeof(ASEndpointsConverter))]
 	public ASEndpoints? Endpoints { get; set; }
 
-	[J("https://www.w3.org/ns/activitystreams#outbox")]
+	[J($"{Constants.ActivityStreamsNs}#outbox")]
 	[JC(typeof(ASCollectionConverter))]
 	public ASCollection<ASObject>? Outbox { get; set; }
 
@@ -72,27 +72,27 @@ public class ASActor : ASObject {
 	[JC(typeof(ASLinkConverter))]
 	public ASLink? Inbox { get; set; }
 
-	[J("https://www.w3.org/ns/activitystreams#followers")]
+	[J($"{Constants.ActivityStreamsNs}#followers")]
 	[JC(typeof(ASCollectionConverter))]
 	public ASCollection<ASObject>? Followers { get; set; }
 
-	[J("https://www.w3.org/ns/activitystreams#following")]
+	[J($"{Constants.ActivityStreamsNs}#following")]
 	[JC(typeof(ASCollectionConverter))]
 	public ASCollection<ASObject>? Following { get; set; }
 
-	[J("https://www.w3.org/ns/activitystreams#sharedInbox")]
+	[J($"{Constants.ActivityStreamsNs}#sharedInbox")]
 	[JC(typeof(ASLinkConverter))]
 	public ASLink? SharedInbox { get; set; }
 
-	[J("https://www.w3.org/ns/activitystreams#url")]
+	[J($"{Constants.ActivityStreamsNs}#url")]
 	[JC(typeof(ASLinkConverter))]
 	public ASLink? Url { get; set; }
 
-	[J("https://www.w3.org/ns/activitystreams#movedTo")]
+	[J($"{Constants.ActivityStreamsNs}#movedTo")]
 	[JC(typeof(ASLinkConverter))]
 	public ASLink? MovedTo { get; set; }
 
-	[J("https://www.w3.org/ns/activitystreams#alsoKnownAs")]
+	[J($"{Constants.ActivityStreamsNs}#alsoKnownAs")]
 	public List<ASLink>? AlsoKnownAs { get; set; }
 
 	[J("http://joinmastodon.org/ns#featured")]
@@ -103,19 +103,19 @@ public class ASActor : ASObject {
 	[JC(typeof(ASLinkConverter))]
 	public ASLink? FeaturedTags { get; set; }
 
-	[J("https://www.w3.org/ns/activitystreams#icon")]
+	[J($"{Constants.ActivityStreamsNs}#icon")]
 	[JC(typeof(ASImageConverter))]
 	public ASImage? Avatar { get; set; }
 
-	[J("https://www.w3.org/ns/activitystreams#image")]
+	[J($"{Constants.ActivityStreamsNs}#image")]
 	[JC(typeof(ASImageConverter))]
 	public ASImage? Banner { get; set; }
 
-	[J("https://w3id.org/security#publicKey")]
+	[J($"{Constants.W3IdSecurityNs}#publicKey")]
 	[JC(typeof(ASPublicKeyConverter))]
 	public ASPublicKey? PublicKey { get; set; }
 
-	public bool IsBot => Type == "https://www.w3.org/ns/activitystreams#Service";
+	public bool IsBot => Type == $"{Constants.ActivityStreamsNs}#Service";
 
 	public void Normalize(string uri, string acct) {
 		if (Type == null || !ActorTypes.Contains(Type)) throw new Exception("Actor is of invalid type");
diff --git a/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASAttachment.cs b/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASAttachment.cs
index 7c79ffd5..226ec18a 100644
--- a/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASAttachment.cs
+++ b/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASAttachment.cs
@@ -13,19 +13,19 @@ public class ASAttachment : ASObjectBase {
 }
 
 public class ASDocument : ASAttachment {
-	[J("https://www.w3.org/ns/activitystreams#url")]
+	[J($"{Constants.ActivityStreamsNs}#url")]
 	[JC(typeof(ASObjectBaseConverter))]
 	public ASObjectBase? Url { get; set; }
 
-	[J("https://www.w3.org/ns/activitystreams#mediaType")]
+	[J($"{Constants.ActivityStreamsNs}#mediaType")]
 	[JC(typeof(ValueObjectConverter))]
 	public string? MediaType { get; set; }
 	
-	[J("https://www.w3.org/ns/activitystreams#sensitive")]
+	[J($"{Constants.ActivityStreamsNs}#sensitive")]
 	[JC(typeof(ValueObjectConverter))]
 	public bool? Sensitive { get; set; }
 	
-	[J("https://www.w3.org/ns/activitystreams#name")]
+	[J($"{Constants.ActivityStreamsNs}#name")]
 	[JC(typeof(ValueObjectConverter))]
 	public string? Description { get; set; }
 }
diff --git a/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASCollection.cs b/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASCollection.cs
index b823fd83..c2c4e018 100644
--- a/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASCollection.cs
+++ b/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASCollection.cs
@@ -1,3 +1,4 @@
+using Iceshrimp.Backend.Core.Configuration;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
 using J = Newtonsoft.Json.JsonPropertyAttribute;
@@ -11,11 +12,11 @@ public class ASCollection<T>() : ASObjectBase where T : ASObject {
 		Id = id;
 	}
 
-	[J("https://www.w3.org/ns/activitystreams#items")]
+	[J($"{Constants.ActivityStreamsNs}#items")]
 	[JC(typeof(ASCollectionItemsConverter))]
 	public List<T>? Items { get; set; }
 
-	[J("https://www.w3.org/ns/activitystreams#totalItems")]
+	[J($"{Constants.ActivityStreamsNs}#totalItems")]
 	[JC(typeof(VC))]
 	public long? TotalItems { get; set; }
 }
diff --git a/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASEndpoints.cs b/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASEndpoints.cs
index a90f6b32..b64fab48 100644
--- a/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASEndpoints.cs
+++ b/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASEndpoints.cs
@@ -1,10 +1,11 @@
+using Iceshrimp.Backend.Core.Configuration;
 using J = Newtonsoft.Json.JsonPropertyAttribute;
 using JC = Newtonsoft.Json.JsonConverterAttribute;
 
 namespace Iceshrimp.Backend.Core.Federation.ActivityStreams.Types;
 
 public class ASEndpoints {
-	[J("https://www.w3.org/ns/activitystreams#sharedInbox")]
+	[J($"{Constants.ActivityStreamsNs}#sharedInbox")]
 	[JC(typeof(ASObjectBaseConverter))]
 	public ASObjectBase? SharedInbox { get; set; }
 }
diff --git a/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASImage.cs b/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASImage.cs
index 27500570..5dcc0029 100644
--- a/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASImage.cs
+++ b/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASImage.cs
@@ -1,3 +1,4 @@
+using Iceshrimp.Backend.Core.Configuration;
 using J = Newtonsoft.Json.JsonPropertyAttribute;
 using JC = Newtonsoft.Json.JsonConverterAttribute;
 using VC = Iceshrimp.Backend.Core.Federation.ActivityStreams.Types.ValueObjectConverter;
@@ -5,11 +6,11 @@ using VC = Iceshrimp.Backend.Core.Federation.ActivityStreams.Types.ValueObjectCo
 namespace Iceshrimp.Backend.Core.Federation.ActivityStreams.Types;
 
 public class ASImage {
-	[J("https://www.w3.org/ns/activitystreams#url")]
+	[J($"{Constants.ActivityStreamsNs}#url")]
 	[JC(typeof(ASLinkConverter))]
 	public ASLink? Url { get; set; }
 
-	[J("https://www.w3.org/ns/activitystreams#sensitive")]
+	[J($"{Constants.ActivityStreamsNs}#sensitive")]
 	[JC(typeof(VC))]
 	public bool? Sensitive { get; set; }
 }
diff --git a/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASLink.cs b/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASLink.cs
index 2ff64b80..5aa27391 100644
--- a/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASLink.cs
+++ b/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASLink.cs
@@ -1,14 +1,15 @@
+using Iceshrimp.Backend.Core.Configuration;
 using J = Newtonsoft.Json.JsonPropertyAttribute;
 using JC = Newtonsoft.Json.JsonConverterAttribute;
 
 namespace Iceshrimp.Backend.Core.Federation.ActivityStreams.Types;
 
 public class ASLink(string url) : ASObjectBase(url) {
-	[J("https://www.w3.org/ns/activitystreams#href")]
+	[J($"{Constants.ActivityStreamsNs}#href")]
 	[JC(typeof(ASObjectBaseConverter))]
 	public ASObjectBase? Href { get; set; }
 
-	[J("https://www.w3.org/ns/activitystreams#name")]
+	[J($"{Constants.ActivityStreamsNs}#name")]
 	[JC(typeof(ValueObjectConverter))]
 	public string? Name { get; set; }
 
diff --git a/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASNote.cs b/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASNote.cs
index 5c59fddf..6346bf05 100644
--- a/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASNote.cs
+++ b/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASNote.cs
@@ -11,51 +11,51 @@ public class ASNote : ASObject {
 	[JC(typeof(VC))]
 	public string? MkContent { get; set; }
 
-	[J("https://www.w3.org/ns/activitystreams#content")]
+	[J($"{Constants.ActivityStreamsNs}#content")]
 	[JC(typeof(VC))]
 	public string? Content { get; set; }
 
-	[J("https://www.w3.org/ns/activitystreams#url")]
+	[J($"{Constants.ActivityStreamsNs}#url")]
 	[JC(typeof(ASLinkConverter))]
 	public ASLink? Url { get; set; }
 
-	[J("https://www.w3.org/ns/activitystreams#sensitive")]
+	[J($"{Constants.ActivityStreamsNs}#sensitive")]
 	[JC(typeof(VC))]
 	public bool? Sensitive { get; set; }
 
-	[J("https://www.w3.org/ns/activitystreams#published")]
+	[J($"{Constants.ActivityStreamsNs}#published")]
 	[JC(typeof(VC))]
 	public DateTime? PublishedAt { get; set; }
 
-	[J("https://www.w3.org/ns/activitystreams#source")]
+	[J($"{Constants.ActivityStreamsNs}#source")]
 	[JC(typeof(ASNoteSourceConverter))]
 	public ASNoteSource? Source { get; set; }
 
-	[J("https://www.w3.org/ns/activitystreams#to")]
+	[J($"{Constants.ActivityStreamsNs}#to")]
 	public List<ASObjectBase> To { get; set; } = [];
 
-	[J("https://www.w3.org/ns/activitystreams#cc")]
+	[J($"{Constants.ActivityStreamsNs}#cc")]
 	public List<ASObjectBase> Cc { get; set; } = [];
 
-	[J("https://www.w3.org/ns/activitystreams#attributedTo")]
+	[J($"{Constants.ActivityStreamsNs}#attributedTo")]
 	public List<ASObjectBase> AttributedTo { get; set; } = [];
 
-	[J("https://www.w3.org/ns/activitystreams#inReplyTo")]
+	[J($"{Constants.ActivityStreamsNs}#inReplyTo")]
 	[JC(typeof(ASObjectBaseConverter))]
 	public ASObjectBase? InReplyTo { get; set; }
 
-	[J("https://www.w3.org/ns/activitystreams#tag")]
+	[J($"{Constants.ActivityStreamsNs}#tag")]
 	[JC(typeof(ASTagConverter))]
 	public List<ASTag>? Tags { get; set; }
 	
-	[J("https://www.w3.org/ns/activitystreams#attachment")]
+	[J($"{Constants.ActivityStreamsNs}#attachment")]
 	[JC(typeof(ASAttachmentConverter))]
 	public List<ASAttachment>? Attachments { get; set; }
 
 	public Note.NoteVisibility GetVisibility(ASActor actor) {
-		if (To.Any(p => p.Id == "https://www.w3.org/ns/activitystreams#Public"))
+		if (To.Any(p => p.Id == $"{Constants.ActivityStreamsNs}#Public"))
 			return Note.NoteVisibility.Public;
-		if (Cc.Any(p => p.Id == "https://www.w3.org/ns/activitystreams#Public"))
+		if (Cc.Any(p => p.Id == $"{Constants.ActivityStreamsNs}#Public"))
 			return Note.NoteVisibility.Home;
 		if (To.Any(p => p.Id is not null && p.Id == (actor.Followers?.Id ?? actor.Id + "/followers")))
 			return Note.NoteVisibility.Followers;
diff --git a/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASNoteSource.cs b/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASNoteSource.cs
index c47bcca4..e7da8a86 100644
--- a/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASNoteSource.cs
+++ b/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASNoteSource.cs
@@ -1,3 +1,4 @@
+using Iceshrimp.Backend.Core.Configuration;
 using J = Newtonsoft.Json.JsonPropertyAttribute;
 using JC = Newtonsoft.Json.JsonConverterAttribute;
 using VC = Iceshrimp.Backend.Core.Federation.ActivityStreams.Types.ValueObjectConverter;
@@ -5,11 +6,11 @@ using VC = Iceshrimp.Backend.Core.Federation.ActivityStreams.Types.ValueObjectCo
 namespace Iceshrimp.Backend.Core.Federation.ActivityStreams.Types;
 
 public class ASNoteSource {
-	[J("https://www.w3.org/ns/activitystreams#content")]
+	[J($"{Constants.ActivityStreamsNs}#content")]
 	[JC(typeof(VC))]
 	public string? Content { get; set; }
 
-	[J("https://www.w3.org/ns/activitystreams#mediaType")]
+	[J($"{Constants.ActivityStreamsNs}#mediaType")]
 	[JC(typeof(VC))]
 	public string? MediaType { get; set; }
 }
diff --git a/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASOrderedCollection.cs b/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASOrderedCollection.cs
index 09ecee1e..d97da126 100644
--- a/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASOrderedCollection.cs
+++ b/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASOrderedCollection.cs
@@ -1,8 +1,9 @@
+using Iceshrimp.Backend.Core.Configuration;
 using J = Newtonsoft.Json.JsonPropertyAttribute;
 
 namespace Iceshrimp.Backend.Core.Federation.ActivityStreams.Types;
 
 public class ASOrderedCollection<T> : ASCollection<T> where T : ASObject {
-	[J("https://www.w3.org/ns/activitystreams#orderedItems")]
+	[J($"{Constants.ActivityStreamsNs}#orderedItems")]
 	public List<T>? OrderedItems { get; set; }
 }
\ No newline at end of file
diff --git a/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASPublicKey.cs b/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASPublicKey.cs
index c7493121..f5811c86 100644
--- a/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASPublicKey.cs
+++ b/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASPublicKey.cs
@@ -1,3 +1,4 @@
+using Iceshrimp.Backend.Core.Configuration;
 using J = Newtonsoft.Json.JsonPropertyAttribute;
 using JC = Newtonsoft.Json.JsonConverterAttribute;
 using VC = Iceshrimp.Backend.Core.Federation.ActivityStreams.Types.ValueObjectConverter;
@@ -5,11 +6,11 @@ using VC = Iceshrimp.Backend.Core.Federation.ActivityStreams.Types.ValueObjectCo
 namespace Iceshrimp.Backend.Core.Federation.ActivityStreams.Types;
 
 public class ASPublicKey : ASObject {
-	[J("https://w3id.org/security#owner")]
+	[J($"{Constants.W3IdSecurityNs}#owner")]
 	[JC(typeof(ASObjectBaseConverter))]
 	public ASObjectBase? Owner { get; set; }
 	
-	[J("https://w3id.org/security#publicKeyPem")]
+	[J($"{Constants.W3IdSecurityNs}#publicKeyPem")]
 	[JC(typeof(VC))]
 	public string? PublicKey { get; set; }
 }
diff --git a/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASTag.cs b/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASTag.cs
index 57d709da..49954717 100644
--- a/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASTag.cs
+++ b/Iceshrimp.Backend/Core/Federation/ActivityStreams/Types/ASTag.cs
@@ -13,11 +13,11 @@ public class ASTag : ASObjectBase {
 }
 
 public class ASTagLink : ASTag {
-	[J("https://www.w3.org/ns/activitystreams#href")]
+	[J($"{Constants.ActivityStreamsNs}#href")]
 	[JC(typeof(ASObjectBaseConverter))]
 	public ASObjectBase? Href { get; set; }
 
-	[J("https://www.w3.org/ns/activitystreams#name")]
+	[J($"{Constants.ActivityStreamsNs}#name")]
 	[JC(typeof(ValueObjectConverter))]
 	public string? Name { get; set; }
 }
diff --git a/Iceshrimp.Backend/Core/Federation/Cryptography/LdSignature.cs b/Iceshrimp.Backend/Core/Federation/Cryptography/LdSignature.cs
index 2bfa5f3e..36f89f8e 100644
--- a/Iceshrimp.Backend/Core/Federation/Cryptography/LdSignature.cs
+++ b/Iceshrimp.Backend/Core/Federation/Cryptography/LdSignature.cs
@@ -1,6 +1,7 @@
 using System.Net;
 using System.Security.Cryptography;
 using System.Text;
+using Iceshrimp.Backend.Core.Configuration;
 using Iceshrimp.Backend.Core.Federation.ActivityStreams;
 using Iceshrimp.Backend.Core.Helpers;
 using Iceshrimp.Backend.Core.Middleware;
@@ -20,7 +21,7 @@ public static class LdSignature {
 	}
 
 	public static async Task<bool> VerifyAsync(JObject activity, string key) {
-		var options = activity["https://w3id.org/security#signature"];
+		var options = activity[$"{Constants.W3IdSecurityNs}#signature"];
 		if (options?.ToObject<SignatureOptions[]>() is not { Length: 1 } signatures) return false;
 		var signature = signatures[0];
 		if (signature.Type is not ["_:RsaSignature2017"]) return false;
@@ -61,7 +62,7 @@ public static class LdSignature {
 
 		options.Signature = signature;
 
-		activity.Add("https://w3id.org/security#signature", JToken.FromObject(options));
+		activity.Add($"{Constants.W3IdSecurityNs}#signature", JToken.FromObject(options));
 
 		return LdHelpers.Expand(activity)?[0] as JObject ??
 		       throw new GracefulException(HttpStatusCode.UnprocessableEntity, "Failed to expand signed activity");
@@ -78,9 +79,9 @@ public static class LdSignature {
 
 		inputOptions.Remove("@id");
 		inputOptions.Remove("@type");
-		inputOptions.Remove("https://w3id.org/security#signatureValue");
+		inputOptions.Remove($"{Constants.W3IdSecurityNs}#signatureValue");
 
-		inputData.Remove("https://w3id.org/security#signature");
+		inputData.Remove($"{Constants.W3IdSecurityNs}#signature");
 
 		var canonicalData    = LdHelpers.Canonicalize(inputData);
 		var canonicalOptions = LdHelpers.Canonicalize(inputOptions);
@@ -94,7 +95,7 @@ public static class LdSignature {
 	private class SignatureOptions {
 		[J("@type")] public required List<string> Type { get; set; }
 
-		[J("https://w3id.org/security#signatureValue")]
+		[J($"{Constants.W3IdSecurityNs}#signatureValue")]
 		[JC(typeof(VC))]
 		public string? Signature { get; set; }
 
@@ -102,15 +103,15 @@ public static class LdSignature {
 		[JC(typeof(VC))]
 		public string? Creator { get; set; }
 
-		[J("https://w3id.org/security#nonce", NullValueHandling = NullValueHandling.Ignore)]
+		[J($"{Constants.W3IdSecurityNs}#nonce", NullValueHandling = NullValueHandling.Ignore)]
 		[JC(typeof(VC))]
 		public string? Nonce { get; set; }
 
-		[J("https://w3id.org/security#domain", NullValueHandling = NullValueHandling.Ignore)]
+		[J($"{Constants.W3IdSecurityNs}#domain", NullValueHandling = NullValueHandling.Ignore)]
 		[JC(typeof(VC))]
 		public string? Domain { get; set; }
 
-		[J("https://w3id.org/security#created", NullValueHandling = NullValueHandling.Ignore)]
+		[J($"{Constants.W3IdSecurityNs}#created", NullValueHandling = NullValueHandling.Ignore)]
 		[JC(typeof(VC))]
 		//FIXME: is this valid? it should output datetime in ISO format
 		public DateTime? Created { get; set; }
diff --git a/Iceshrimp.Tests/Cryptography/LdSignatureTests.cs b/Iceshrimp.Tests/Cryptography/LdSignatureTests.cs
index 8a8bc724..625c6350 100644
--- a/Iceshrimp.Tests/Cryptography/LdSignatureTests.cs
+++ b/Iceshrimp.Tests/Cryptography/LdSignatureTests.cs
@@ -1,4 +1,5 @@
 using System.Security.Cryptography;
+using Iceshrimp.Backend.Core.Configuration;
 using Iceshrimp.Backend.Core.Federation.ActivityStreams;
 using Iceshrimp.Backend.Core.Federation.ActivityStreams.Types;
 using Iceshrimp.Backend.Core.Federation.Cryptography;
@@ -53,7 +54,7 @@ public class LdSignatureTests {
 		var data = (_signed.DeepClone() as JObject)!;
 		data.Should().NotBeNull();
 
-		data.Remove("https://w3id.org/security#signature");
+		data.Remove($"{Constants.W3IdSecurityNs}#signature");
 		var verify = await LdSignature.VerifyAsync(data, _keypair.ExportRSAPublicKeyPem());
 		verify.Should().BeFalse();
 	}
@@ -64,10 +65,10 @@ public class LdSignatureTests {
 		data.Should().NotBeNull();
 
 		var signature =
-			data["https://w3id.org/security#signature"]?[0]?["https://w3id.org/security#signatureValue"]?[0]?["@value"];
+			data[$"{Constants.W3IdSecurityNs}#signature"]?[0]?[$"{Constants.W3IdSecurityNs}#signatureValue"]?[0]?["@value"];
 		signature.Should().NotBeNull();
 
-		data["https://w3id.org/security#signature"]![0]!["https://w3id.org/security#signatureValue"]![0]!["@value"] +=
+		data[$"{Constants.W3IdSecurityNs}#signature"]![0]![$"{Constants.W3IdSecurityNs}#signatureValue"]![0]!["@value"] +=
 			"test";
 		var e = await Assert.ThrowsExceptionAsync<FormatException>(async () =>
 			                                                           await LdSignature.VerifyAsync(data,
@@ -83,10 +84,10 @@ public class LdSignatureTests {
 		data.Should().NotBeNull();
 
 		var creator =
-			data["https://w3id.org/security#signature"]?[0]?["http://purl.org/dc/terms/creator"]?[0]?["@value"];
+			data[$"{Constants.W3IdSecurityNs}#signature"]?[0]?["http://purl.org/dc/terms/creator"]?[0]?["@value"];
 		creator.Should().NotBeNull();
 
-		data["https://w3id.org/security#signature"]![0]!["http://purl.org/dc/terms/creator"]![0]!["@value"] += "test";
+		data[$"{Constants.W3IdSecurityNs}#signature"]![0]!["http://purl.org/dc/terms/creator"]![0]!["@value"] += "test";
 		var verify = await LdSignature.VerifyAsync(data, _keypair.ExportRSAPublicKeyPem());
 		verify.Should().BeFalse();
 	}