diff --git a/src/main/java/org/qortal/api/resource/ArbitraryResource.java b/src/main/java/org/qortal/api/resource/ArbitraryResource.java
index 8f4dad61..8e1b043d 100644
--- a/src/main/java/org/qortal/api/resource/ArbitraryResource.java
+++ b/src/main/java/org/qortal/api/resource/ArbitraryResource.java
@@ -309,7 +309,7 @@ public class ArbitraryResource {
 			List<PaymentData> payments = new ArrayList<>();
 
 			ArbitraryTransactionData transactionData = new ArbitraryTransactionData(baseTransactionData,
-					5, 2, 0, size, digest, dataType, chunkHashes, payments);
+					5, ArbitraryTransaction.SERVICE_ARBITRARY_DATA, 0, size, digest, dataType, chunkHashes, payments);
 
 			ArbitraryTransaction transaction = (ArbitraryTransaction) Transaction.fromData(repository, transactionData);
 			transaction.computeNonce();
diff --git a/src/main/java/org/qortal/api/resource/WebsiteResource.java b/src/main/java/org/qortal/api/resource/WebsiteResource.java
index ef188dda..93bcdf06 100644
--- a/src/main/java/org/qortal/api/resource/WebsiteResource.java
+++ b/src/main/java/org/qortal/api/resource/WebsiteResource.java
@@ -120,7 +120,7 @@ public class WebsiteResource {
             List<PaymentData> payments = new ArrayList<>();
 
             ArbitraryTransactionData transactionData = new ArbitraryTransactionData(baseTransactionData,
-                    5, 2, 0, size, digest, dataType, chunkHashes, payments);
+                    5, ArbitraryTransaction.SERVICE_WEBSITE, 0, size, digest, dataType, chunkHashes, payments);
 
             ArbitraryTransaction transaction = (ArbitraryTransaction) Transaction.fromData(repository, transactionData);
             transaction.computeNonce();
diff --git a/src/main/java/org/qortal/transaction/ArbitraryTransaction.java b/src/main/java/org/qortal/transaction/ArbitraryTransaction.java
index 6ee8d5ff..8f42aff9 100644
--- a/src/main/java/org/qortal/transaction/ArbitraryTransaction.java
+++ b/src/main/java/org/qortal/transaction/ArbitraryTransaction.java
@@ -24,6 +24,15 @@ public class ArbitraryTransaction extends Transaction {
 	// Properties
 	private ArbitraryTransactionData arbitraryTransactionData;
 
+	// Services
+	public static final int SERVICE_AUTO_UPDATE = 1;
+	public static final int SERVICE_NAME_STORAGE = 10;
+	public static final int SERVICE_ARBITRARY_DATA = 100;
+	public static final int SERVICE_WEBSITE = 200;
+	public static final int SERVICE_GIT_REPOSITORY = 300;
+	public static final int SERVICE_BLOG_POST = 777;
+	public static final int SERVICE_BLOG_COMMENT = 778;
+
 	// Other useful constants
 	public static final int MAX_DATA_SIZE = 4000;
 	public static final int MAX_CHUNK_HASHES_LENGTH = 8000;