diff --git a/src/commit.rs b/src/commit.rs
index b1aa43f..de02185 100644
--- a/src/commit.rs
+++ b/src/commit.rs
@@ -229,37 +229,28 @@ fn register_new_state(commitment: &mut Process, commit_msg: CommitMessage) -> Re
 }
 
 // Process validation for a state with validation tokens
-fn process_validation(commitment: &mut Process, commit_msg: CommitMessage) -> Result<OutPoint> {
-    let mut state_to_validate = commitment
+fn process_validation(updated_process: &mut Process, commit_msg: CommitMessage) -> Result<OutPoint> {
+    let new_state_id = commit_msg.pcd_commitment.create_merkle_tree()?.root().ok_or(Error::msg("Invalid merkle tree"))?;
+    let new_state_id_hex = new_state_id.to_lower_hex_string();
+    let mut state_to_validate = updated_process
         .get_latest_concurrent_states()?
         .into_iter()
-        .find(|state| state.pcd_commitment == commit_msg.pcd_commitment)
+        .find(|state| state.state_id == new_state_id_hex)
         .ok_or(Error::msg("Unknown state"))?
         .clone();
 
     state_to_validate.validation_tokens = commit_msg.validation_tokens;
-    state_to_validate.is_valid(commitment.get_latest_commited_state())?;
+    state_to_validate.is_valid(updated_process.get_latest_commited_state())?;
 
-    let mandatory_input = prepare_next_transaction(&state_to_validate)?;
-    let commited_in = commit_new_transaction(commitment, mandatory_input)?;
+    let commited_in = commit_new_transaction(updated_process, state_to_validate)?;
 
     Ok(commited_in)
 }
 
-// Prepare the next transaction based on the validated state
-fn prepare_next_transaction(state_to_validate: &ProcessState) -> Result<OutPoint> {
-    let mut freezed_utxos = lock_freezed_utxos()?;
-    if freezed_utxos.remove(&state_to_validate.commited_in) {
-        Ok(state_to_validate.commited_in)
-    } else {
-        Err(Error::msg("Commitment UTXO doesn't exist"))
-    }
-}
-
 // Commit the new transaction and update the process state
 fn commit_new_transaction(
-    commitment: &mut Process,
-    mandatory_input: OutPoint,
+    updated_process: &mut Process,
+    state_to_commit: ProcessState,
 ) -> Result<OutPoint> {
     let sp_wallet = WALLET
         .get()
@@ -280,24 +271,32 @@ fn commit_new_transaction(
 
     let mut freezed_utxos = lock_freezed_utxos()?;
 
+    let next_commited_in = updated_process.get_process_tip()?;
+    let mandatory_input = if let Some(next_outpoint) = freezed_utxos.take(&next_commited_in) {
+        next_outpoint
+    } else {
+        return Err(Error::msg(format!("Missing next commitment outpoint for process {}", updated_process.get_process_id()?)));
+    };
+
+    let commitment_payload = Vec::from_hex(state_to_commit.state_id)?;
+
     let psbt = create_transaction(
         vec![mandatory_input],
         &freezed_utxos,
         &sp_wallet,
         vec![recipient],
-        None,
+        Some(commitment_payload),
         fee_rate,
         None,
     )?;
 
     let new_tx = psbt.extract_tx()?;
-    daemon.test_mempool_accept(&new_tx)?;
 
     let txid = daemon.broadcast(&new_tx)?;
     let commited_in = OutPoint::new(txid, 0);
 
     freezed_utxos.insert(commited_in);
-    commitment.update_states_tip(commited_in)?;
+    updated_process.update_states_tip(commited_in)?;
 
     Ok(commited_in)
 }