diff --git a/src/main/java/net/kemitix/gitdb/impl/GitDBRepo.java b/src/main/java/net/kemitix/gitdb/impl/GitDBRepo.java
index c7e1102..388270c 100644
--- a/src/main/java/net/kemitix/gitdb/impl/GitDBRepo.java
+++ b/src/main/java/net/kemitix/gitdb/impl/GitDBRepo.java
@@ -56,17 +56,6 @@ class GitDBRepo {
         headWriter = new HeadWriter(repository);
     }
 
-    /**
-     * Insert a blob into the store, returning its unique id.
-     *
-     * @param blob content of the blob
-     * @return the id of the blob
-     * @throws IOException the blob could not be stored
-     */
-    ObjectId insertBlob(final byte[] blob) throws IOException {
-        return valueWriter.write(blob);
-    }
-
     /**
      * Insert a new, empty tree into the store, returning its unique id.
      *
@@ -82,23 +71,6 @@ class GitDBRepo {
         return keyWriter.writeFirst(key, valueId);
     }
 
-    /**
-     * Insert a tree into the store, copying the exiting tree from the branch, returning its new unique id.
-     *
-     * @param branchRef the branch to copy the tree from
-     * @param key       the key to insert
-     * @param valueId   id of the value
-     * @return the id of the inserted tree
-     * @throws IOException the tree could not be stored
-     */
-    ObjectId insertTree(
-            final Ref branchRef,
-            final String key,
-            final ObjectId valueId
-    ) throws IOException {
-        return keyWriter.write(key, valueId, branchRef);
-    }
-
     /**
      * Insert a commit into the store, returning its unique id.
      *
@@ -154,8 +126,8 @@ class GitDBRepo {
      * @throws IOException if there was an error writing the value
      */
     ObjectId writeValue(final Ref branchRef, final String key, final String value) throws IOException {
-        final ObjectId blob = insertBlob(value.getBytes(StandardCharsets.UTF_8));
-        return insertTree(branchRef, key, blob);
+        final ObjectId blob = valueWriter.write(value.getBytes(StandardCharsets.UTF_8));
+        return keyWriter.write(key, blob, branchRef);
     }
 
     /**
diff --git a/src/main/java/net/kemitix/gitdb/impl/InitGitDBRepo.java b/src/main/java/net/kemitix/gitdb/impl/InitGitDBRepo.java
index ee65fbd..d99de8b 100644
--- a/src/main/java/net/kemitix/gitdb/impl/InitGitDBRepo.java
+++ b/src/main/java/net/kemitix/gitdb/impl/InitGitDBRepo.java
@@ -66,8 +66,8 @@ class InitGitDBRepo {
 
     private void createInitialBranchOnMaster(final Repository repository) throws IOException {
         final GitDBRepo repo = new GitDBRepo(repository);
-        final ObjectId objectId =
-                repo.insertBlob(GitDB.VERSION.toString().getBytes(StandardCharsets.UTF_8));
+        final ValueWriter valueWriter = new ValueWriter(repository);
+        final ObjectId objectId = valueWriter.write(GitDB.VERSION.toString().getBytes(StandardCharsets.UTF_8));
         final ObjectId treeId = repo.insertNewTree(GIT_DB_VERSION, objectId);
         final ObjectId commitId = repo.initialCommit(treeId, INIT_MESSAGE, INIT_USER, INIT_EMAIL);
         createBranch(repository, commitId, MASTER);