diff --git a/storage/src/commitment.rs b/storage/src/commitment.rs
new file mode 100644
index 0000000..0874bc7
--- /dev/null
+++ b/storage/src/commitment.rs
@@ -0,0 +1,8 @@
+use serde::{Deserialize, Serialize};
+
+use crate::merkle_tree_public::CommitmentHashType;
+
+#[derive(Debug, Serialize, Deserialize, Clone, Default, PartialEq, Eq)]
+pub struct Commitment {
+    pub commitment_hash: CommitmentHashType,
+}
diff --git a/storage/src/lib.rs b/storage/src/lib.rs
index 684dcc8..708fd80 100644
--- a/storage/src/lib.rs
+++ b/storage/src/lib.rs
@@ -12,6 +12,7 @@ pub mod block;
 pub mod error;
 pub mod merkle_tree_public;
 pub mod nullifier;
+pub mod commitment;
 pub mod nullifier_sparse_merkle_tree;
 pub mod transaction;
 pub mod utxo_commitment;
diff --git a/storage/src/merkle_tree_public/mod.rs b/storage/src/merkle_tree_public/mod.rs
index 8a34631..f1fc89e 100644
--- a/storage/src/merkle_tree_public/mod.rs
+++ b/storage/src/merkle_tree_public/mod.rs
@@ -3,3 +3,4 @@ pub mod merkle_tree;
 pub mod tree_leav_item;
 
 pub type TreeHashType = [u8; 32];
+pub type CommitmentHashType = Vec<u8>;