diff --git a/README.md b/README.md
index 1c15cf0..38ad517 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@ An implementation of the [Decentralized Identifiers (DIDs) v1.0](https://www.w3.
 <dependency>
     <groupId>com.apicatalog</groupId>
     <artifactId>carbon-did</artifactId>
-    <version>0.0.7</version>
+    <version>0.1.0</version>
 </dependency>
 
 ```
@@ -30,7 +30,7 @@ An implementation of the [Decentralized Identifiers (DIDs) v1.0](https://www.w3.
 Android API Level >=24
 
 ```gradle
-implementation("com.apicatalog:carbon-did:0.0.7")
+implementation("com.apicatalog:carbon-did:0.1.0")
 ```
 
 
diff --git a/pom.xml b/pom.xml
index ed218d1..a14969e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -7,7 +7,7 @@
 	<groupId>com.apicatalog</groupId>
 	<artifactId>carbon-did</artifactId>
 
-	<version>0.0.7</version>
+	<version>0.1.0</version>
 	<packaging>jar</packaging>
 
 	<url>https://github.com/filip26/carbon-decentralized-identifiers</url>
@@ -58,8 +58,8 @@
 
 		<jakarta.json.version>2.0.1</jakarta.json.version>
 
-		<copper.multicodec.version>0.0.6</copper.multicodec.version>
-		<copper.multibase.version>0.0.1</copper.multibase.version>
+		<copper.multicodec.version>0.1.1</copper.multicodec.version>
+		<copper.multibase.version>0.0.2</copper.multibase.version>
 
 		<!-- test resources -->
 		<junit.version>5.10.1</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 264f4a7..b3a0ca3 100644
--- a/src/main/java/com/apicatalog/did/key/DidKey.java
+++ b/src/main/java/com/apicatalog/did/key/DidKey.java
@@ -23,12 +23,12 @@
  */
 public class DidKey extends Did {
 
-    private static final long serialVersionUID = 582726516478574544L;
+    private static final long serialVersionUID = 3710900614215756688L;
 
     public static final String METHOD_KEY = "key";
 
     protected static final MulticodecDecoder MULTICODEC = MulticodecDecoder.getInstance(Tag.Key);
-    protected static final MultibaseDecoder MULTIBASE = MultibaseDecoder.getInstance(Multibase.BASE_58_BTC);
+    protected static final MultibaseDecoder MULTIBASE = MultibaseDecoder.getInstance();
 
     private final Multicodec codec;
 
@@ -68,7 +68,9 @@ public static final DidKey from(final Did did) {
             throw new IllegalArgumentException("The given DID method [" + did.getMethod() + "] is not 'key'. DID [" + did.toString() + "].");
         }
 
-        final byte[] decoded = MULTIBASE.decode(did.getMethodSpecificId());
+        final Multibase base = MULTIBASE.getBase(did.getMethodSpecificId()).orElseThrow(() -> new IllegalArgumentException("Cannot detect did:key base encoding."));
+        
+        final byte[] decoded = base.decode(did.getMethodSpecificId());
 
         final Multicodec codec = MULTICODEC.getCodec(decoded).orElseThrow(() -> new IllegalArgumentException("Cannot detect did:key codec."));
 
diff --git a/src/main/java/com/apicatalog/did/key/DidKeyResolver.java b/src/main/java/com/apicatalog/did/key/DidKeyResolver.java
index 7dc9b34..2509e0e 100644
--- a/src/main/java/com/apicatalog/did/key/DidKeyResolver.java
+++ b/src/main/java/com/apicatalog/did/key/DidKeyResolver.java
@@ -48,13 +48,6 @@ public DidDocument resolve(final Did did) {
      * @return The new verification key
      */
     public static DidVerificationMethod createSignatureMethod(DidKey didKey) {
-
-//        if (!Multicodec.Codec.Ed25519PublicKey.equals(didKey.getCodec())) {
-//            throw new IllegalArgumentException();
-//        }
-        // 5.
-//        String encodingType = ED25519_VERIFICATION_KEY_2020_TYPE;
-
         return new DidVerificationMethod(
                     DidUrl.from(didKey, null, null, didKey.getMethodSpecificId()),
                     DidUrl.from(didKey, null, null, didKey.getMethodSpecificId()),
diff --git a/src/test/java/com/apicatalog/did/DidKeyTest.java b/src/test/java/com/apicatalog/did/DidKeyTest.java
index a06d3df..fadff31 100644
--- a/src/test/java/com/apicatalog/did/DidKeyTest.java
+++ b/src/test/java/com/apicatalog/did/DidKeyTest.java
@@ -14,7 +14,7 @@
 import org.junit.jupiter.params.provider.MethodSource;
 
 import com.apicatalog.did.key.DidKey;
-import com.apicatalog.multicodec.MulticodecRegistry;
+import com.apicatalog.multicodec.codec.KeyCodec;
 
 @DisplayName("DID Key")
 @TestMethodOrder(OrderAnnotation.class)
@@ -54,77 +54,77 @@ static Stream<DidKeyTestCase> testVectors() {
     static final DidKeyTestCase testCases[] = new DidKeyTestCase[] {
             DidKeyTestCase.create(
                     "did:key:z6MkpTHR8VNsBxYAAWHut2Geadd9jSwuBV8xRoAnwWsdvktH",
-                    MulticodecRegistry.ED25519_PUBLIC_KEY,
+                    KeyCodec.ED25519_PUBLIC_KEY,
                     32
                     ),
             DidKeyTestCase.create(
                     "did:key:z6MkiTBz1ymuepAQ4HEHYSF1H8quG5GLVVQR3djdX3mDooWp",
-                    MulticodecRegistry.ED25519_PUBLIC_KEY,
+                    KeyCodec.ED25519_PUBLIC_KEY,
                     32
                     ),
             DidKeyTestCase.create(
                     "did:key:z6MkjchhfUsD6mmvni8mCdXHw216Xrm9bQe2mBH1P5RDjVJG",
-                    MulticodecRegistry.ED25519_PUBLIC_KEY,
+                    KeyCodec.ED25519_PUBLIC_KEY,
                     32
                     ),
             DidKeyTestCase.create(
                     "did:key:z6MknGc3ocHs3zdPiJbnaaqDi58NGb4pk1Sp9WxWufuXSdxf",
-                    MulticodecRegistry.ED25519_PUBLIC_KEY,
+                    KeyCodec.ED25519_PUBLIC_KEY,
                     32
                     ),
             DidKeyTestCase.create(
                     "did:key:z6MkicdicToW5HbxPP7zZV1H7RHvXgRMhoujWAF2n5WQkdd2",
-                    MulticodecRegistry.ED25519_PUBLIC_KEY,
+                    KeyCodec.ED25519_PUBLIC_KEY,
                     32
                     ),
             DidKeyTestCase.create(
                     "did:key:z6MkiVQTYk3L2XKY6yg6MyeN2QLE5QkKcXByUeY1dkdiLx4j",
-                    MulticodecRegistry.ED25519_PUBLIC_KEY,
+                    KeyCodec.ED25519_PUBLIC_KEY,
                     32
                     ),
             DidKeyTestCase.create(
                     "did:key:zQ3shokFTS3brHcDQrn82RUDfCZESWL1ZdCEJwekUDPQiYBme",
-                    MulticodecRegistry.SECP256K1_PUBLIC_KEY,
+                    KeyCodec.SECP256K1_PUBLIC_KEY,
                     33
                     ),
             DidKeyTestCase.create(
                     "did:key:zQ3shtxV1FrJfhqE1dvxYRcCknWNjHc3c5X1y3ZSoPDi2aur2",
-                    MulticodecRegistry.SECP256K1_PUBLIC_KEY,
+                    KeyCodec.SECP256K1_PUBLIC_KEY,
                     33
                     ),
             DidKeyTestCase.create(
                     "did:key:zQ3shZc2QzApp2oymGvQbzP8eKheVshBHbU4ZYjeXqwSKEn6N",
-                    MulticodecRegistry.SECP256K1_PUBLIC_KEY,
+                    KeyCodec.SECP256K1_PUBLIC_KEY,
                     33
                     ),            
             DidKeyTestCase.create(
                     "did:key:zDnaerDaTF5BXEavCrfRZEk316dpbLsfPDZ3WJ5hRTPFU2169",
-                    MulticodecRegistry.P256_PUBLIC_KEY,
+                    KeyCodec.P256_PUBLIC_KEY,
                     33
                     ),
             DidKeyTestCase.create(
                     "did:key:zDnaerx9CtbPJ1q36T5Ln5wYt3MQYeGRG5ehnPAmxcf5mDZpv",
-                    MulticodecRegistry.P256_PUBLIC_KEY,
+                    KeyCodec.P256_PUBLIC_KEY,
                     33
                     ),
             DidKeyTestCase.create(
                     "did:key:z82Lm1MpAkeJcix9K8TMiLd5NMAhnwkjjCBeWHXyu3U4oT2MVJJKXkcVBgjGhnLBn2Kaau9",
-                    MulticodecRegistry.P384_PUBLIC_KEY,
+                    KeyCodec.P384_PUBLIC_KEY,
                     49
                     ),
             DidKeyTestCase.create(
                     "did:key:z82LkvCwHNreneWpsgPEbV3gu1C6NFJEBg4srfJ5gdxEsMGRJUz2sG9FE42shbn2xkZJh54",
-                    MulticodecRegistry.P384_PUBLIC_KEY,
+                    KeyCodec.P384_PUBLIC_KEY,
                     49
                     ),
             DidKeyTestCase.create(
                     "did:key:z2J9gaYxrKVpdoG9A4gRnmpnRCcxU6agDtFVVBVdn1JedouoZN7SzcyREXXzWgt3gGiwpoHq7K68X4m32D8HgzG8wv3sY5j7",
-                    MulticodecRegistry.P521_PUBLIC_KEY,
+                    KeyCodec.P521_PUBLIC_KEY,
                     67
                     ),
             DidKeyTestCase.create(
                     "did:key:z2J9gcGdb2nEyMDmzQYv2QZQcM1vXktvy1Pw4MduSWxGabLZ9XESSWLQgbuPhwnXN7zP7HpTzWqrMTzaY5zWe6hpzJ2jnw4f",
-                    MulticodecRegistry.P521_PUBLIC_KEY,
+                    KeyCodec.P521_PUBLIC_KEY,
                     67
                     ),
 
@@ -136,13 +136,13 @@ static Stream<DidKeyTestCase> testVectors() {
             // versioned keys
             DidKeyTestCase.create(
                     "did:key:1.1:z6MkicdicToW5HbxPP7zZV1H7RHvXgRMhoujWAF2n5WQkdd2",
-                    MulticodecRegistry.ED25519_PUBLIC_KEY,
+                    KeyCodec.ED25519_PUBLIC_KEY,
                     32,
                     "1.1"
                     ),
             DidKeyTestCase.create(
                     "did:key:0.7:z6MkicdicToW5HbxPP7zZV1H7RHvXgRMhoujWAF2n5WQkdd2",
-                    MulticodecRegistry.ED25519_PUBLIC_KEY,
+                    KeyCodec.ED25519_PUBLIC_KEY,
                     32,
                     "0.7"
                     ),