diff --git a/core/src/main/java/tech/pegasys/web3signer/core/service/http/handlers/signing/SignatureFormatter.java b/core/src/main/java/tech/pegasys/web3signer/core/service/http/handlers/signing/SignatureFormatter.java
deleted file mode 100644
index 103c531c5..000000000
--- a/core/src/main/java/tech/pegasys/web3signer/core/service/http/handlers/signing/SignatureFormatter.java
+++ /dev/null
@@ -1,21 +0,0 @@
-/*
- * Copyright 2020 ConsenSys AG.
- *
- * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
- * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
- * specific language governing permissions and limitations under the License.
- */
-package tech.pegasys.web3signer.core.service.http.handlers.signing;
-
-import tech.pegasys.web3signer.signing.ArtifactSignature;
-
-@FunctionalInterface
-public interface SignatureFormatter<T extends ArtifactSignature> {
-
-  String format(T signature);
-}