diff --git a/trillian/ctfe/storage/storage.go b/trillian/ctfe/storage/storage.go
new file mode 100644
index 0000000000..5fccb72419
--- /dev/null
+++ b/trillian/ctfe/storage/storage.go
@@ -0,0 +1,29 @@
+// Copyright 2024 Google LLC
+//
+// 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 storage defines the IssuanceChainStorage type, which allows different storage implementation for the key-value pairs of issuance chains.
+package storage
+
+import (
+	"context"
+)
+
+// IssuanceChainStorage is an interface which allows CTFE binaries to use different storage implementations for issuance chains.
+type IssuanceChainStorage interface {
+	// FindByKey returns the issuance chain associated with the provided key.
+	FindByKey(ctx context.Context, key []byte) ([]byte, error)
+
+	// Add inserts the key-value pair of issuance chain.
+	Add(ctx context.Context, key []byte, chain []byte) error
+}