diff --git a/emmarin/cl/cl/src/cl/merkle.rs b/emmarin/cl/cl/src/cl/merkle.rs
index bb10e3c..8aecb78 100644
--- a/emmarin/cl/cl/src/cl/merkle.rs
+++ b/emmarin/cl/cl/src/cl/merkle.rs
@@ -43,6 +43,8 @@ pub fn root<const N: usize>(elements: [[u8; 32]; N]) -> [u8; 32] {
     nodes[0]
 }
 
+pub type Path = Vec<PathNode>;
+
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub enum PathNode {
     Left([u8; 32]),
@@ -66,7 +68,7 @@ pub fn path_root(leaf: [u8; 32], path: &[PathNode]) -> [u8; 32] {
     computed_hash
 }
 
-pub fn path<const N: usize>(leaves: [[u8; 32]; N], idx: usize) -> Vec<PathNode> {
+pub fn path<const N: usize>(leaves: [[u8; 32]; N], idx: usize) -> Path {
     assert!(N.is_power_of_two());
     assert!(idx < N);
 
diff --git a/emmarin/cl/cl/src/cl/mod.rs b/emmarin/cl/cl/src/cl/mod.rs
index c2c25f6..714e83a 100644
--- a/emmarin/cl/cl/src/cl/mod.rs
+++ b/emmarin/cl/cl/src/cl/mod.rs
@@ -9,6 +9,7 @@ pub mod note;
 pub mod nullifier;
 pub mod output;
 pub mod partial_tx;
+pub mod sparse_merkle;
 
 pub use balance::{Balance, BalanceWitness};
 pub use bundle::Bundle;
diff --git a/emmarin/cl/cl/src/zone_layer/ledger.rs b/emmarin/cl/cl/src/zone_layer/ledger.rs
index 1273115..240304b 100644
--- a/emmarin/cl/cl/src/zone_layer/ledger.rs
+++ b/emmarin/cl/cl/src/zone_layer/ledger.rs
@@ -3,12 +3,10 @@ use std::collections::BTreeSet;
 use crate::cl::{
     merkle,
     mmr::{MMRProof, MMR},
-    NoteCommitment, Nullifier,
+    sparse_merkle, NoteCommitment, Nullifier,
 };
 use serde::{Deserialize, Serialize};
 
-use super::sparse_merkle_tree;
-
 #[derive(Debug, Clone, Copy, PartialEq, Serialize, Deserialize)]
 pub struct Ledger {
     cm_root: [u8; 32],
@@ -31,16 +29,13 @@ impl LedgerWitness {
 
     pub fn assert_nf_update(&mut self, nf: Nullifier, path: &[merkle::PathNode]) {
         // verify that the path corresponds to the nullifier
-        assert_eq!(sparse_merkle_tree::path_key(path), nf.0);
+        assert_eq!(sparse_merkle::path_key(path), nf.0);
 
         // verify that the nullifier was not already present
-        assert_eq!(
-            merkle::path_root(sparse_merkle_tree::ABSENT, path),
-            self.nf_root
-        );
+        assert_eq!(merkle::path_root(sparse_merkle::ABSENT, path), self.nf_root);
 
         // update the nullifer root with the nullifier inserted into the tree
-        self.nf_root = merkle::path_root(sparse_merkle_tree::PRESENT, path);
+        self.nf_root = merkle::path_root(sparse_merkle::PRESENT, path);
     }
 }
 
@@ -58,7 +53,7 @@ impl LedgerState {
     }
 
     pub fn nf_root(&self) -> [u8; 32] {
-        sparse_merkle_tree::sparse_root(&self.nullifiers)
+        sparse_merkle::sparse_root(&self.nullifiers)
     }
 
     pub fn add_commitment(&mut self, cm: NoteCommitment) -> MMRProof {
@@ -66,7 +61,7 @@ impl LedgerState {
     }
 
     pub fn add_nullifier(&mut self, nf: Nullifier) -> Vec<merkle::PathNode> {
-        let path = sparse_merkle_tree::sparse_path(nf.0, &self.nullifiers);
+        let path = sparse_merkle::sparse_path(nf.0, &self.nullifiers);
 
         assert!(!self.nullifiers.contains(&nf.0));
         self.nullifiers.insert(nf.0);
diff --git a/emmarin/cl/cl/src/zone_layer/mod.rs b/emmarin/cl/cl/src/zone_layer/mod.rs
index 06da01c..20710b3 100644
--- a/emmarin/cl/cl/src/zone_layer/mod.rs
+++ b/emmarin/cl/cl/src/zone_layer/mod.rs
@@ -1,4 +1,3 @@
 pub mod ledger;
 pub mod notes;
-pub mod sparse_merkle_tree;
 pub mod tx;
diff --git a/emmarin/cl/ledger_proof_statements/src/ledger.rs b/emmarin/cl/ledger_proof_statements/src/ledger.rs
index a7feda6..0355703 100644
--- a/emmarin/cl/ledger_proof_statements/src/ledger.rs
+++ b/emmarin/cl/ledger_proof_statements/src/ledger.rs
@@ -1,4 +1,5 @@
 use crate::ptx::PtxPublic;
+use cl::cl::merkle;
 use cl::cl::{bundle::BundleId, Output};
 use cl::zone_layer::{
     ledger::{Ledger, LedgerWitness},
@@ -19,7 +20,18 @@ pub struct LedgerProofPublic {
 pub struct LedgerProofPrivate {
     pub ledger: LedgerWitness,
     pub id: ZoneId,
-    pub bundles: Vec<Vec<PtxPublic>>,
+    pub bundles: Vec<LedgerBundleWitness>,
+}
+
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct LedgerBundleWitness {
+    pub partials: Vec<LedgerPtxWitness>,
+}
+
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct LedgerPtxWitness {
+    pub ptx: PtxPublic,
+    pub nf_proofs: Vec<merkle::Path>,
 }
 
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
diff --git a/emmarin/cl/ledger_proof_statements/src/ptx.rs b/emmarin/cl/ledger_proof_statements/src/ptx.rs
index 93d555c..6f2b189 100644
--- a/emmarin/cl/ledger_proof_statements/src/ptx.rs
+++ b/emmarin/cl/ledger_proof_statements/src/ptx.rs
@@ -1,15 +1,19 @@
-use cl::cl::{merkle, PartialTx, PartialTxWitness};
+use cl::cl::{
+    merkle,
+    mmr::{MMRProof, MMR},
+    PartialTx, PartialTxWitness,
+};
 use serde::{Deserialize, Serialize};
 
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct PtxPublic {
     pub ptx: PartialTx,
-    pub cm_roots: Vec<[u8; 32]>,
+    pub cm_mmr: MMR,
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct PtxPrivate {
     pub ptx: PartialTxWitness,
-    pub input_cm_paths: Vec<Vec<merkle::PathNode>>,
-    pub cm_roots: Vec<[u8; 32]>,
+    pub input_cm_paths: Vec<MMRProof>,
+    pub cm_mmr: MMR,
 }
diff --git a/emmarin/cl/ledger_validity_proof/ledger/src/main.rs b/emmarin/cl/ledger_validity_proof/ledger/src/main.rs
index 5849b15..9f9ab02 100644
--- a/emmarin/cl/ledger_validity_proof/ledger/src/main.rs
+++ b/emmarin/cl/ledger_validity_proof/ledger/src/main.rs
@@ -30,8 +30,9 @@ fn main() {
 
     for bundle in bundles {
         let balance_public = BalancePublic {
-            balances: bundle.iter().map(|ptx| ptx.ptx.balance).collect::<Vec<_>>(),
+            balances: bundle.partials.iter().map(|bundle_ptx| bundle_ptx.ptx.ptx.balance).collect::<Vec<_>>(),
         };
+
         // verify bundle is balanced
         env::verify(
             nomos_cl_risc0_proofs::BALANCE_ID,
@@ -68,41 +69,42 @@ fn main() {
 
 fn process_ptx(
     mut ledger: LedgerWitness,
-    ptx: &PtxPublic,
+    ptx_witness: &LedgerPtxWitness,
     zone_id: ZoneId,
     roots: &[[u8; 32]],
 ) -> (LedgerWitness, Vec<Output>) {
     // always verify the ptx to ensure outputs were derived with the correct zone id
     env::verify(nomos_cl_risc0_proofs::PTX_ID, &serde::to_vec(&ptx).unwrap()).unwrap();
 
-    let cm_roots = &ptx.cm_roots;
-    let ptx = &ptx.ptx;
+    PtxWitness { ref ptx, ref nf_proofs } = ptx_witness;
 
-    let mut outputs = vec![];
+    assert_eq!(ptx.cm_mmr, roots); // we force commitment proofs w.r.t. latest MMR
+    assert_eq!(ptx.ptx.inputs.len(), nf_proofs.len());
 
-    for (input, input_cm_root) in ptx.inputs.iter().zip(cm_roots) {
-        if input.zone_id == zone_id {
-            assert!(roots.contains(input_cm_root));
-            assert!(!ledger.nullifiers.contains(&input.nullifier));
-            ledger.nullifiers.push(input.nullifier);
-
-            env::verify(
-                input.constraint.0,
-                &serde::to_vec(&ConstraintPublic {
-                    ptx_root: ptx.root(),
-                    nf: input.nullifier,
-                })
-                .unwrap(),
-            )
-            .unwrap();
+    for (input, nf_proof) in ptx.ptx.inputs.iter().zip(nf_proofs) {
+        if input.zone_id != zone_id {
+            continue;
         }
+
+        ledger.assert_nf_update(input.nullifier, nf_proof);
+
+        env::verify(
+            input.constraint.0,
+            &serde::to_vec(&ConstraintPublic {
+                ptx_root: ptx.root(),
+                nf: input.nullifier,
+            }).unwrap(),
+        ).unwrap();
     }
 
+    let mut outputs = vec![];
     for output in &ptx.outputs {
-        if output.zone_id == zone_id {
-            ledger.commitments.push(&output.note_comm.0);
-            outputs.push(*output);
+        if output.zone_id != zone_id {
+            continue;
         }
+
+        ledger.commitments.push(&output.note_comm.0);
+        outputs.push(*output);
     }
 
     (ledger, outputs)