diff --git a/README.md b/README.md
index 68fe166..3b54221 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,7 @@ An implementation of the [Decentralized Identifiers (DIDs) v1.0](https://www.w3.
 <dependency>
     <groupId>com.apicatalog</groupId>
     <artifactId>carbon-did</artifactId>
-    <version>0.2.0</version>
+    <version>0.3.0</version>
 </dependency>
 
 ```
@@ -32,7 +32,7 @@ An implementation of the [Decentralized Identifiers (DIDs) v1.0](https://www.w3.
 Android API Level >=24
 
 ```gradle
-implementation("com.apicatalog:carbon-did:0.2.0")
+implementation("com.apicatalog:carbon-did:0.3.0")
 ```
 
 
diff --git a/pom.xml b/pom.xml
index 6f00230..7ee9dd2 100644
--- a/pom.xml
+++ b/pom.xml
@@ -7,7 +7,7 @@
 	<groupId>com.apicatalog</groupId>
 	<artifactId>carbon-did</artifactId>
 
-	<version>0.2.0</version>
+	<version>0.3.0</version>
 	<packaging>jar</packaging>
 
 	<url>https://github.com/filip26/carbon-decentralized-identifiers</url>
@@ -59,7 +59,7 @@
 		<jakarta.json.version>2.0.1</jakarta.json.version>
 
 		<copper.multicodec.version>0.1.1</copper.multicodec.version>
-		<copper.multibase.version>0.4.0</copper.multibase.version>
+		<copper.multibase.version>0.5.0</copper.multibase.version>
 
 		<!-- test resources -->
 		<junit.version>5.10.2</junit.version>
diff --git a/src/main/java/com/apicatalog/did/key/DidKey.java b/src/main/java/com/apicatalog/did/key/DidKey.java
index 98dcb8c..add30ac 100644
--- a/src/main/java/com/apicatalog/did/key/DidKey.java
+++ b/src/main/java/com/apicatalog/did/key/DidKey.java
@@ -26,12 +26,14 @@ public class DidKey extends Did {
 
     public static final String METHOD_KEY = "key";
 
-    private final Multicodec codec;
+    protected final Multibase base;
+    protected final Multicodec codec;
 
-    private final byte[] rawKey;
+    protected final byte[] rawKey;
 
-    protected DidKey(Did did, Multicodec codec, byte[] rawValue) {
-        super(did.getMethod(), did.getVersion(), did.getMethodSpecificId());
+    protected DidKey(String version, String encoded, Multibase base, Multicodec codec, byte[] rawValue) {
+        super(METHOD_KEY, version, encoded);
+        this.base = base;
         this.codec = codec;
         this.rawKey = rawValue;
     }
@@ -65,14 +67,18 @@ public static final DidKey from(final Did did, final MultibaseDecoder bases, fin
         }
 
         final Multibase base = bases.getBase(did.getMethodSpecificId()).orElseThrow(() -> new IllegalArgumentException("Unsupported did:key base encoding. DID [" + did.toString() + "]."));
-        
+
         final byte[] decoded = base.decode(did.getMethodSpecificId());
 
         final Multicodec codec = codecs.getCodec(decoded).orElseThrow(() -> new IllegalArgumentException("Unsupported did:key codec. DID [" + did.toString() + "]."));
 
         final byte[] rawKey = codec.decode(decoded);
 
-        return new DidKey(did, codec, rawKey);
+        return new DidKey(did.getVersion(), did.getMethodSpecificId(), base, codec, rawKey);
+    }
+
+    public static final DidKey create(Multibase base, Multicodec codec, byte[] rawKey) {
+        return new DidKey(null, base.encode(codec.encode(rawKey)), base, codec, rawKey);
     }
 
     public static boolean isDidKey(final Did did) {
@@ -93,6 +99,10 @@ public Multicodec getCodec() {
         return codec;
     }
 
+    public Multibase getBase() {
+        return base;
+    }
+
     public byte[] getRawKey() {
         return rawKey;
     }