diff --git a/src/signature.rs b/src/signature.rs
index 4d30bcf..230fce9 100644
--- a/src/signature.rs
+++ b/src/signature.rs
@@ -6,8 +6,6 @@ use sp_client::bitcoin::key::Secp256k1;
 use sp_client::bitcoin::secp256k1::schnorr::Signature;
 use sp_client::bitcoin::secp256k1::{Keypair, Message, PublicKey, SecretKey};
 
-use crate::pcd::AnkPcdHash;
-
 sha256t_hash_newtype! {
     pub struct AnkMessageTag = hash_str("4nk/Message");
 
@@ -34,17 +32,17 @@ impl AnkMessageHash {
 }
 
 impl AnkValidationYesHash {
-    pub fn from_commitment(commitment: AnkPcdHash) -> Self {
+    pub fn from_merkle_root(merkle_root: [u8; 32]) -> Self {
         let mut eng = AnkValidationYesHash::engine();
-        eng.input(&commitment.to_byte_array());
+        eng.input(&merkle_root);
         AnkValidationYesHash::from_engine(eng)
     }
 }
 
 impl AnkValidationNoHash {
-    pub fn from_commitment(commitment: AnkPcdHash) -> Self {
+    pub fn from_merkle_root(merkle_root: [u8; 32]) -> Self {
         let mut eng = AnkValidationNoHash::engine();
-        eng.input(&commitment.to_byte_array());
+        eng.input(&merkle_root);
         AnkValidationNoHash::from_engine(eng)
     }
 }