diff --git a/emmarin/apps/swapvm/app/src/lib.rs b/emmarin/apps/swapvm/app/src/lib.rs
index be0c929..7a2b2f2 100644
--- a/emmarin/apps/swapvm/app/src/lib.rs
+++ b/emmarin/apps/swapvm/app/src/lib.rs
@@ -72,6 +72,12 @@ pub enum ZoneOp {
     Ledger(Tx),
 }
 
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct PoolsUpdate {
+    pub tx: Tx,
+    pub notes: Vec<InputWitness>,
+}
+
 // Txs are of the following form:
 impl ZoneData {
     pub fn swap(&mut self, swap: &Swap) {
@@ -180,8 +186,9 @@ impl ZoneData {
         }
     }
 
-    pub fn update_and_commit(self) -> ZoneData {
-        self
+    pub fn update_and_commit(mut self, updates: &PoolsUpdate) -> [u8; 32] {
+        self.pools_update(&updates.tx, &updates.notes);
+        self.commit()
     }
 
     pub fn commit(&self) -> [u8; 32] {
diff --git a/emmarin/apps/swapvm/stf/host/src/lib.rs b/emmarin/apps/swapvm/stf/host/src/lib.rs
index 47bc4e8..568b2c7 100644
--- a/emmarin/apps/swapvm/stf/host/src/lib.rs
+++ b/emmarin/apps/swapvm/stf/host/src/lib.rs
@@ -1,6 +1,4 @@
-// These constants represent the RISC-V ELF and the image ID generated by risc0-build.
-// The ELF is used for proving and the ID is used for verification.
-use app::ZoneOp;
+use app::{PoolsUpdate, ZoneOp};
 use cl::mantle::{ledger::Ledger, zone::ZoneData};
 use ledger_proof_statements::ledger::SyncLog;
 use methods::{STF_ELF, STF_ID};
@@ -12,6 +10,7 @@ pub struct StfPrivate {
     pub new_ledger: Ledger,
     pub sync_logs: Vec<SyncLog>,
     pub ops: Vec<ZoneOp>,
+    pub update_tx: PoolsUpdate,
 }
 
 impl StfPrivate {
@@ -22,6 +21,8 @@ impl StfPrivate {
             .write(&self.new_ledger)?
             .write(&self.sync_logs)?
             .write(&STF_ID)?
+            .write(&self.ops)?
+            .write(&self.update_tx)?
             .build()?;
 
         let prove_info = prover.prove(env, STF_ELF)?;
diff --git a/emmarin/apps/swapvm/stf/methods/guest/src/main.rs b/emmarin/apps/swapvm/stf/methods/guest/src/main.rs
index e665588..52fe255 100644
--- a/emmarin/apps/swapvm/stf/methods/guest/src/main.rs
+++ b/emmarin/apps/swapvm/stf/methods/guest/src/main.rs
@@ -1,4 +1,4 @@
-use app::{ZoneData, ZoneOp};
+use app::{PoolsUpdate, ZoneData, ZoneOp};
 use cl::{
     crust::Tx,
     mantle::{ledger::Ledger, zone::ZoneState},
@@ -16,6 +16,7 @@ fn main() {
     let sync_logs: Vec<SyncLog> = env::read();
     let stf: [u8; 32] = env::read();
     let ops: Vec<ZoneOp> = env::read();
+    let update_tx: PoolsUpdate = env::read();
 
     let zone_id = zone_data.zone_id;
 
@@ -33,6 +34,7 @@ fn main() {
             ZoneOp::RemoveLiquidity { tx, .. } => tx,
             ZoneOp::Ledger(tx) => tx,
         })
+        .chain(std::iter::once(&update_tx.tx))
         .collect();
 
     let outputs = txs
@@ -71,7 +73,7 @@ fn main() {
         },
         new: ZoneState {
             ledger,
-            zone_data: zone_data.commit(),
+            zone_data: zone_data.update_and_commit(&update_tx),
             stf,
         },
     };